Merge branch 'feature/raw-sqlite' into dev

android-base/build.gradle

@@ -1,6 +1,5 @@
 apply plugin: 'com.android.library'
 
-
 android {
     compileSdkVersion 25
     buildToolsVersion "25.0.2"
@@ -32,6 +31,7 @@ dependencies {
     implementation 'com.google.dagger:dagger:2.9'
     implementation 'com.android.support:design:25.3.1'
     implementation 'com.android.support:appcompat-v7:25.3.1'
+    implementation 'org.apache.commons:commons-lang3:3.5'
 
     annotationProcessor 'com.google.dagger:dagger-compiler:2.9'
     androidTestAnnotationProcessor 'com.google.dagger:dagger-compiler:2.9'

android-base/src/main/java/org/isoron/androidbase/storage/BaseSQLiteOpenHelper.java

@@ -0,0 +1,85 @@
+/*
+ * Copyright (C) 2017 Álinson Santos Xavier <isoron@gmail.com>
+ *
+ * This file is part of Loop Habit Tracker.
+ *
+ * Loop Habit Tracker is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by the
+ * Free Software Foundation, either version 3 of the License, or (at your
+ * option) any later version.
+ *
+ * Loop Habit Tracker is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ *
+ */
+
+package org.isoron.androidbase.storage;
+
+import android.content.*;
+import android.database.sqlite.*;
+
+import org.isoron.androidbase.*;
+
+import java.io.*;
+import java.util.*;
+
+
+public class BaseSQLiteOpenHelper extends SQLiteOpenHelper
+{
+    private final Context context;
+
+    private final int version;
+
+    public BaseSQLiteOpenHelper(@AppContext Context context,
+                                String databaseFilename,
+                                int version)
+    {
+        super(context, databaseFilename, null, version);
+        this.context = context;
+        this.version = version;
+    }
+
+    @Override
+    public void onCreate(SQLiteDatabase db)
+    {
+        executeMigrations(db, -1, version);
+    }
+
+    @Override
+    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion)
+    {
+        executeMigrations(db, oldVersion, newVersion);
+    }
+
+    private void executeMigrations(SQLiteDatabase db,
+                                   int oldVersion,
+                                   int newVersion)
+    {
+        try
+        {
+            for (int v = oldVersion + 1; v <= newVersion; v++)
+            {
+                String fname = String.format(Locale.US, "migrations/%d.sql", v);
+                InputStream stream = context.getAssets().open(fname);
+                for (String command : SQLParser.parse(stream))
+                    db.execSQL(command);
+            }
+        }
+        catch (Exception e)
+        {
+            throw new RuntimeException(e);
+        }
+    }
+
+    @Override
+    public void onDowngrade(SQLiteDatabase db, int oldVersion, int newVersion)
+    {
+        throw new UnsupportedDatabaseVersionException();
+    }
+}

android-base/src/main/java/org/isoron/androidbase/storage/Column.java

@@ -0,0 +1,30 @@
+/*
+ * Copyright (C) 2017 Álinson Santos Xavier <isoron@gmail.com>
+ *
+ * This file is part of Loop Habit Tracker.
+ *
+ * Loop Habit Tracker is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by the
+ * Free Software Foundation, either version 3 of the License, or (at your
+ * option) any later version.
+ *
+ * Loop Habit Tracker is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ *
+ */
+
+package org.isoron.androidbase.storage;
+
+import java.lang.annotation.*;
+
+@Retention(RetentionPolicy.RUNTIME)
+public @interface Column
+{
+    String name() default "";
+}

android-base/src/main/java/org/isoron/androidbase/storage/SQLParser.java

@@ -0,0 +1,163 @@
+/*
+ * Copyright (C) 2014 Markus Pfeiffer
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.isoron.androidbase.storage;
+
+import java.io.BufferedInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.ArrayList;
+import java.util.List;
+
+class Tokenizer {
+
+    private final InputStream mStream;
+
+    private boolean           mIsNext;
+    private int               mCurrent;
+
+    public Tokenizer(final InputStream in) {
+        this.mStream = in;
+    }
+
+    public boolean hasNext() throws IOException {
+
+        if (!this.mIsNext) {
+            this.mIsNext = true;
+            this.mCurrent = this.mStream.read();
+        }
+        return this.mCurrent != -1;
+    }
+
+    public int next() throws IOException {
+
+        if (!this.mIsNext) {
+            this.mCurrent = this.mStream.read();
+        }
+        this.mIsNext = false;
+        return this.mCurrent;
+    }
+
+    public boolean skip(final String s) throws IOException {
+
+        if (s == null || s.length() == 0) {
+            return false;
+        }
+
+        if (s.charAt(0) != this.mCurrent) {
+            return false;
+        }
+
+        final int len = s.length();
+        this.mStream.mark(len - 1);
+
+        for (int n = 1; n < len; n++) {
+            final int value = this.mStream.read();
+
+            if (value != s.charAt(n)) {
+                this.mStream.reset();
+                return false;
+            }
+        }
+        return true;
+    }
+}
+
+
+public class SQLParser {
+
+    public final static int STATE_NONE          = 0;
+    public final static int STATE_STRING        = 1;
+    public final static int STATE_COMMENT       = 2;
+    public final static int STATE_COMMENT_BLOCK = 3;
+
+    public static List<String> parse(final InputStream stream) throws IOException {
+
+        final BufferedInputStream buffer = new BufferedInputStream(stream);
+        final List<String> commands = new ArrayList<String>();
+        final StringBuffer sb = new StringBuffer();
+
+        try {
+            final Tokenizer tokenizer = new Tokenizer(buffer);
+            int state = STATE_NONE;
+
+            while (tokenizer.hasNext()) {
+                final char c = (char) tokenizer.next();
+
+                if (state == STATE_COMMENT_BLOCK) {
+                    if (tokenizer.skip("*/")) {
+                        state = STATE_NONE;
+                    }
+                    continue;
+
+                } else if (state == STATE_COMMENT) {
+                    if (isNewLine(c)) {
+                        state = STATE_NONE;
+                    }
+                    continue;
+
+                } else if (state == STATE_NONE && tokenizer.skip("/*")) {
+                    state = STATE_COMMENT_BLOCK;
+                    continue;
+
+                } else if (state == STATE_NONE && tokenizer.skip("--")) {
+                    state = STATE_COMMENT;
+                    continue;
+
+                } else if (state == STATE_NONE && c == ';') {
+                    final String command = sb.toString().trim();
+                    commands.add(command);
+                    sb.setLength(0);
+                    continue;
+
+                } else if (state == STATE_NONE && c == '\'') {
+                    state = STATE_STRING;
+
+                } else if (state == STATE_STRING && c == '\'') {
+                    state = STATE_NONE;
+
+                }
+
+                if (state == STATE_NONE || state == STATE_STRING) {
+                    if (state == STATE_NONE && isWhitespace(c)) {
+                        if (sb.length() > 0 && sb.charAt(sb.length() - 1) != ' ') {
+                            sb.append(' ');
+                        }
+                    } else {
+                        sb.append(c);
+                    }
+                }
+            }
+
+        } finally {
+            buffer.close();
+        }
+
+        if (sb.length() > 0) {
+            commands.add(sb.toString().trim());
+        }
+
+        return commands;
+    }
+
+    private static boolean isNewLine(final char c) {
+        return c == '\r' || c == '\n';
+    }
+
+    private static boolean isWhitespace(final char c) {
+        return c == '\r' || c == '\n' || c == '\t' || c == ' ';
+    }
+}

android-base/src/main/java/org/isoron/androidbase/storage/SQLiteRepository.java

@@ -0,0 +1,282 @@
+/*
+ * Copyright (C) 2017 Álinson Santos Xavier <isoron@gmail.com>
+ *
+ * This file is part of Loop Habit Tracker.
+ *
+ * Loop Habit Tracker is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by the
+ * Free Software Foundation, either version 3 of the License, or (at your
+ * option) any later version.
+ *
+ * Loop Habit Tracker is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ *
+ */
+
+package org.isoron.androidbase.storage;
+
+import android.content.*;
+import android.database.*;
+import android.database.sqlite.*;
+import android.support.annotation.*;
+import android.util.*;
+
+import org.apache.commons.lang3.*;
+
+import java.lang.annotation.*;
+import java.lang.reflect.*;
+import java.util.*;
+
+public class SQLiteRepository<T>
+{
+    @NonNull
+    private final Class klass;
+
+    @NonNull
+    private final SQLiteDatabase db;
+
+    public SQLiteRepository(@NonNull Class<T> klass, @NonNull SQLiteDatabase db)
+    {
+        this.klass = klass;
+        this.db = db;
+    }
+
+    @Nullable
+    public T find(@NonNull Long id)
+    {
+        return findFirst(String.format("where %s=?", getIdName()),
+            id.toString());
+    }
+
+    @NonNull
+    public List<T> findAll(String query, String... params)
+    {
+        try (Cursor c = db.rawQuery(buildSelectQuery() + query, params))
+        {
+            return cursorToMultipleRecords(c);
+        }
+    }
+
+    @Nullable
+    public T findFirst(String query, String... params)
+    {
+        try (Cursor c = db.rawQuery(buildSelectQuery() + query, params))
+        {
+            if (!c.moveToNext()) return null;
+            return cursorToSingleRecord(c);
+        }
+    }
+
+    public void execSQL(String query, Object... params)
+    {
+        db.execSQL(query, params);
+    }
+
+    public void save(T record)
+    {
+        try
+        {
+            Field fields[] = getFields();
+            String columns[] = getColumnNames();
+
+            ContentValues values = new ContentValues();
+            for (int i = 0; i < fields.length; i++)
+                fieldToContentValue(values, columns[i], fields[i], record);
+
+            Long id = (Long) getIdField().get(record);
+            int affectedRows = 0;
+
+            if (id != null) affectedRows =
+                db.update(getTableName(), values, getIdName() + "=?",
+                    new String[]{ id.toString() });
+
+            if (id == null || affectedRows == 0)
+            {
+                id = db.insertOrThrow(getTableName(), null, values);
+                getIdField().set(record, id);
+            }
+
+        }
+        catch (Exception e)
+        {
+            throw new RuntimeException(e);
+        }
+    }
+
+    public void remove(T record)
+    {
+        try
+        {
+            Long id = (Long) getIdField().get(record);
+            if (id == null) return;
+
+            db.delete(getTableName(), getIdName() + "=?",
+                new String[]{ id.toString() });
+            getIdField().set(record, null);
+        }
+        catch (Exception e)
+        {
+            throw new RuntimeException(e);
+        }
+    }
+
+    @NonNull
+    private List<T> cursorToMultipleRecords(Cursor c)
+    {
+        List<T> records = new LinkedList<>();
+        while (c.moveToNext()) records.add(cursorToSingleRecord(c));
+        return records;
+    }
+
+    @NonNull
+    private T cursorToSingleRecord(Cursor cursor)
+    {
+        try
+        {
+            Constructor constructor = klass.getDeclaredConstructors()[0];
+            constructor.setAccessible(true);
+            T record = (T) constructor.newInstance();
+
+            int index = 0;
+            for (Field field : getFields())
+                copyFieldFromCursor(record, field, cursor, index++);
+            return record;
+        }
+        catch (Exception e)
+        {
+            throw new RuntimeException(e);
+        }
+    }
+
+    private void copyFieldFromCursor(T record, Field field, Cursor c, int index)
+        throws IllegalAccessException
+    {
+        if (field.getType().isAssignableFrom(Integer.class))
+            field.set(record, c.getInt(index));
+        else if (field.getType().isAssignableFrom(Long.class))
+            field.set(record, c.getLong(index));
+        else if (field.getType().isAssignableFrom(Double.class))
+            field.set(record, c.getDouble(index));
+        else if (field.getType().isAssignableFrom(String.class))
+            field.set(record, c.getString(index));
+        else throw new RuntimeException(
+                "Type not supported: " + field.getType().getName() + " " +
+                field.getName());
+    }
+
+    private void fieldToContentValue(ContentValues values,
+                                     String columnName,
+                                     Field field,
+                                     T record)
+    {
+        try
+        {
+            if (field.getType().isAssignableFrom(Integer.class))
+                values.put(columnName, (Integer) field.get(record));
+            else if (field.getType().isAssignableFrom(Long.class))
+                values.put(columnName, (Long) field.get(record));
+            else if (field.getType().isAssignableFrom(Double.class))
+                values.put(columnName, (Double) field.get(record));
+            else if (field.getType().isAssignableFrom(String.class))
+                values.put(columnName, (String) field.get(record));
+            else throw new RuntimeException(
+                    "Type not supported: " + field.getName());
+        }
+        catch (IllegalAccessException e)
+        {
+            throw new RuntimeException(e);
+        }
+    }
+
+    private String buildSelectQuery()
+    {
+        return String.format("select %s from %s ",
+            StringUtils.join(getColumnNames(), ", "), getTableName());
+    }
+
+    private List<Pair<Field, Column>> getFieldColumnPairs()
+    {
+        List<Pair<Field, Column>> fields = new ArrayList<>();
+        for (Field field : klass.getDeclaredFields())
+            for (Annotation annotation : field.getAnnotations())
+            {
+                if (!(annotation instanceof Column)) continue;
+                Column column = (Column) annotation;
+                fields.add(new Pair<>(field, column));
+            }
+        return fields;
+    }
+
+    @NonNull
+    private Field[] getFields()
+    {
+        List<Field> fields = new ArrayList<>();
+        List<Pair<Field, Column>> columns = getFieldColumnPairs();
+        for (Pair<Field, Column> pair : columns) fields.add(pair.first);
+        return fields.toArray(new Field[]{});
+    }
+
+    @NonNull
+    private String[] getColumnNames()
+    {
+        List<String> names = new ArrayList<>();
+        List<Pair<Field, Column>> columns = getFieldColumnPairs();
+        for (Pair<Field, Column> pair : columns)
+        {
+            String cname = pair.second.name();
+            if (cname.isEmpty()) cname = pair.first.getName();
+            if (names.contains(cname))
+                throw new RuntimeException("duplicated column : " + cname);
+            names.add(cname);
+        }
+
+        return names.toArray(new String[]{});
+    }
+
+    @NonNull
+    private String getTableName()
+    {
+        String name = getTableAnnotation().name();
+        if (name.isEmpty()) throw new RuntimeException("Table name is empty");
+        return name;
+    }
+
+    @NonNull
+    private String getIdName()
+    {
+        String id = getTableAnnotation().id();
+        if (id.isEmpty()) throw new RuntimeException("Table id is empty");
+        return id;
+    }
+
+    @NonNull
+    private Field getIdField()
+    {
+        Field fields[] = getFields();
+        String idName = getIdName();
+        for (Field f : fields)
+            if (f.getName().equals(idName)) return f;
+        throw new RuntimeException("Field not found: " + idName);
+    }
+
+    @NonNull
+    private Table getTableAnnotation()
+    {
+        Table t = null;
+        for (Annotation annotation : klass.getAnnotations())
+        {
+            if (!(annotation instanceof Table)) continue;
+            t = (Table) annotation;
+            break;
+        }
+
+        if (t == null) throw new RuntimeException("Table annotation not found");
+        return t;
+    }
+}

android-base/src/main/java/org/isoron/androidbase/storage/Table.java

@@ -0,0 +1,32 @@
+/*
+ * Copyright (C) 2017 Álinson Santos Xavier <isoron@gmail.com>
+ *
+ * This file is part of Loop Habit Tracker.
+ *
+ * Loop Habit Tracker is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by the
+ * Free Software Foundation, either version 3 of the License, or (at your
+ * option) any later version.
+ *
+ * Loop Habit Tracker is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ *
+ */
+
+package org.isoron.androidbase.storage;
+
+import java.lang.annotation.*;
+
+@Target(ElementType.TYPE)
+@Retention(RetentionPolicy.RUNTIME)
+public @interface Table
+{
+    String name();
+    String id() default "id";
+}

android-base/src/main/java/org/isoron/androidbase/storage/UnsupportedDatabaseVersionException.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2016 Álinson Santos Xavier <isoron@gmail.com>
+ * Copyright (C) 2017 Álinson Santos Xavier <isoron@gmail.com>
  *
  * This file is part of Loop Habit Tracker.
  *
@@ -15,13 +15,12 @@
  *
  * You should have received a copy of the GNU General Public License along
  * with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ *
  */
 
-package org.isoron.uhabits.models.sqlite.records;
-
-import android.database.*;
+package org.isoron.androidbase.storage;
 
-public interface SQLiteRecord
+public class UnsupportedDatabaseVersionException extends RuntimeException
 {
-    void copyFrom(Cursor c);
 }

build.gradle

@@ -5,7 +5,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.0.0-alpha3'
+        classpath 'com.android.tools.build:gradle:3.0.0-alpha4'
         classpath 'com.neenbedankt.gradle.plugins:android-apt:1.8'
         classpath 'com.getkeepsafe.dexcount:dexcount-gradle-plugin:0.6.4'
         classpath 'com.neenbedankt.gradle.plugins:android-apt:1.8'

gradle/wrapper/gradle-wrapper.properties

@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions-snapshots/gradle-4.0-20170417000025+0000-all.zip
+distributionUrl=http\://services.gradle.org/distributions/gradle-4.0-all.zip

uhabits-android/build.gradle

@@ -64,7 +64,6 @@ dependencies {
     implementation 'com.github.paolorotolo:appintro:3.4.0'
     implementation 'com.google.dagger:dagger:2.9'
     implementation 'com.jakewharton:butterknife:8.6.1-SNAPSHOT'
-    implementation 'com.michaelpardo:activeandroid:3.1.0-SNAPSHOT'
     implementation 'org.apmem.tools:layouts:1.10'
     implementation 'org.jetbrains:annotations-java5:15.0'
     implementation 'com.google.code.gson:gson:2.7'

uhabits-android/src/androidTest/java/org/isoron/uhabits/HabitFixtures.java

@@ -115,9 +115,8 @@ public class HabitFixtures
         return habit;
     }
 
-    public void purgeHabits(HabitList habitList)
+    public synchronized void purgeHabits(HabitList habitList)
     {
-        for (Habit h : habitList)
-            habitList.remove(h);
+        habitList.removeAll();
     }
 }

uhabits-android/src/androidTest/java/org/isoron/uhabits/models/sqlite/HabitRecordTest.java

@@ -22,9 +22,11 @@ package org.isoron.uhabits.models.sqlite;
 import android.support.test.runner.*;
 import android.test.suitebuilder.annotation.*;
 
+import org.isoron.androidbase.storage.*;
 import org.isoron.uhabits.*;
 import org.isoron.uhabits.core.models.*;
 import org.isoron.uhabits.models.sqlite.records.*;
+import org.isoron.uhabits.utils.*;
 import org.junit.*;
 import org.junit.runner.*;
 
@@ -35,25 +37,18 @@ import static org.hamcrest.core.IsEqual.*;
 @MediumTest
 public class HabitRecordTest extends BaseAndroidTest
 {
+    private Habit habit;
+
+    private SQLiteRepository<HabitRecord> sqlite =
+        new SQLiteRepository<>(HabitRecord.class, DatabaseUtils.openDatabase());
+
+    @Before
     @Override
     public void setUp()
     {
         super.setUp();
 
-        Habit h = component.getModelFactory().buildHabit();
-        h.setName("Hello world");
-        h.setId(1000L);
-
-        HabitRecord record = new HabitRecord();
-        record.copyFrom(h);
-        record.position = 0;
-        record.save(1000L);
-    }
-
-    @Test
-    public void testCopyFrom()
-    {
-        Habit habit = component.getModelFactory().buildHabit();
+        habit = component.getModelFactory().buildHabit();
         habit.setName("Hello world");
         habit.setDescription("Did you greet the world today?");
         habit.setColor(1);
@@ -61,7 +56,11 @@ public class HabitRecordTest extends BaseAndroidTest
         habit.setFrequency(Frequency.THREE_TIMES_PER_WEEK);
         habit.setReminder(new Reminder(8, 30, WeekdayList.EVERY_DAY));
         habit.setId(1000L);
+    }
 
+    @Test
+    public void testCopyFrom()
+    {
         HabitRecord rec = new HabitRecord();
         rec.copyFrom(habit);
 

uhabits-android/src/androidTest/java/org/isoron/uhabits/models/sqlite/SQLiteHabitListTest.java

@@ -22,12 +22,13 @@ package org.isoron.uhabits.models.sqlite;
 import android.support.test.runner.*;
 import android.test.suitebuilder.annotation.*;
 
-import com.activeandroid.query.*;
+import com.google.common.collect.*;
 
+import org.isoron.androidbase.storage.*;
 import org.isoron.uhabits.*;
 import org.isoron.uhabits.core.models.*;
-import org.isoron.uhabits.models.sqlite.*;
 import org.isoron.uhabits.models.sqlite.records.*;
+import org.isoron.uhabits.utils.*;
 import org.junit.*;
 import org.junit.rules.*;
 import org.junit.runner.*;
@@ -36,6 +37,8 @@ import java.util.*;
 
 import static org.hamcrest.MatcherAssert.*;
 import static org.hamcrest.core.IsEqual.*;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.verify;
 
 @SuppressWarnings("JavaDoc")
 @RunWith(AndroidJUnit4.class)
@@ -49,6 +52,10 @@ public class SQLiteHabitListTest extends BaseAndroidTest
 
     private ModelFactory modelFactory;
 
+    private SQLiteRepository<HabitRecord> repository;
+
+    private ModelObservable.Listener listener;
+
     @Override
     public void setUp()
     {
@@ -57,6 +64,9 @@ public class SQLiteHabitListTest extends BaseAndroidTest
         fixtures.purgeHabits(habitList);
 
         modelFactory = component.getModelFactory();
+        repository =
+            new SQLiteRepository<>(HabitRecord.class,
+                DatabaseUtils.openDatabase());
 
         for (int i = 0; i < 10; i++)
         {
@@ -68,8 +78,20 @@ public class SQLiteHabitListTest extends BaseAndroidTest
             HabitRecord record = new HabitRecord();
             record.copyFrom(h);
             record.position = i;
-            record.save(i);
+            repository.save(record);
+        }
+
+        habitList.reload();
+
+        listener = mock(ModelObservable.Listener.class);
+        habitList.getObservable().addListener(listener);
     }
+
+    @Override
+    protected void tearDown() throws Exception
+    {
+        habitList.getObservable().removeListener(listener);
+        super.tearDown();
     }
 
     @Test
@@ -77,6 +99,8 @@ public class SQLiteHabitListTest extends BaseAndroidTest
     {
         Habit habit = modelFactory.buildHabit();
         habitList.add(habit);
+        verify(listener).onModelChange();
+
         exception.expect(IllegalArgumentException.class);
         habitList.add(habit);
     }
@@ -91,7 +115,7 @@ public class SQLiteHabitListTest extends BaseAndroidTest
         habitList.add(habit);
         assertThat(habit.getId(), equalTo(12300L));
 
-        HabitRecord record = getRecord(12300L);
+        HabitRecord record = repository.find(12300L);
         assertNotNull(record);
         assertThat(record.name, equalTo(habit.getName()));
     }
@@ -106,7 +130,7 @@ public class SQLiteHabitListTest extends BaseAndroidTest
         habitList.add(habit);
         assertNotNull(habit.getId());
 
-        HabitRecord record = getRecord(habit.getId());
+        HabitRecord record = repository.find(habit.getId());
         assertNotNull(record);
         assertThat(record.name, equalTo(habit.getName()));
     }
@@ -120,7 +144,7 @@ public class SQLiteHabitListTest extends BaseAndroidTest
     @Test
     public void testGetAll_withArchived()
     {
-        List<Habit> habits = habitList.toList();
+        List<Habit> habits = Lists.newArrayList(habitList.iterator());
         assertThat(habits.size(), equalTo(10));
         assertThat(habits.get(3).getName(), equalTo("habit 3"));
     }
@@ -166,12 +190,4 @@ public class SQLiteHabitListTest extends BaseAndroidTest
         h2.setId(1000L);
         assertThat(habitList.indexOf(h2), equalTo(-1));
     }
-
-    private HabitRecord getRecord(long id)
-    {
-        return new Select()
-            .from(HabitRecord.class)
-            .where("id = ?", id)
-            .executeSingle();
-    }
 }

uhabits-android/src/androidTest/java/org/isoron/uhabits/models/sqlite/SQLiteRepetitionListTest.java

@@ -23,19 +23,19 @@ import android.support.annotation.*;
 import android.support.test.runner.*;
 import android.test.suitebuilder.annotation.*;
 
-import com.activeandroid.query.*;
-
+import org.isoron.androidbase.storage.*;
 import org.isoron.uhabits.*;
 import org.isoron.uhabits.core.models.*;
 import org.isoron.uhabits.core.utils.*;
 import org.isoron.uhabits.models.sqlite.records.*;
+import org.isoron.uhabits.utils.*;
 import org.junit.*;
 import org.junit.runner.*;
 
 import java.util.*;
 
 import static android.support.test.espresso.matcher.ViewMatchers.assertThat;
-import static org.hamcrest.core.IsEqual.equalTo;
+import static org.hamcrest.core.IsEqual.*;
 import static org.isoron.uhabits.core.models.Checkmark.CHECKED_EXPLICITLY;
 
 @RunWith(AndroidJUnit4.class)
@@ -50,6 +50,8 @@ public class SQLiteRepetitionListTest extends BaseAndroidTest
 
     private long day;
 
+    private SQLiteRepository<RepetitionRecord> sqlite;
+
     @Override
     public void setUp()
     {
@@ -59,6 +61,8 @@ public class SQLiteRepetitionListTest extends BaseAndroidTest
         repetitions = habit.getRepetitions();
         today = DateUtils.getStartOfToday();
         day = DateUtils.millisecondsInOneDay;
+        sqlite = new SQLiteRepository<>(RepetitionRecord.class,
+            DatabaseUtils.openDatabase());
     }
 
     @Test
@@ -130,15 +134,13 @@ public class SQLiteRepetitionListTest extends BaseAndroidTest
     @Nullable
     private RepetitionRecord getByTimestamp(long timestamp)
     {
-        return selectByTimestamp(timestamp).executeSingle();
-    }
+        String query = "where habit = ? and timestamp = ?";
 
-    @NonNull
-    private From selectByTimestamp(long timestamp)
-    {
-        return new Select()
-            .from(RepetitionRecord.class)
-            .where("habit = ?", habit.getId())
-            .and("timestamp = ?", timestamp);
+        String params[] = {
+            Long.toString(habit.getId()),
+            Long.toString(timestamp)
+        };
+
+        return sqlite.findFirst(query, params);
     }
 }

uhabits-android/src/androidTest/java/org/isoron/uhabits/models/sqlite/SQLiteRepositoryTest.java

@@ -0,0 +1,189 @@
+/*
+ * Copyright (C) 2016 Álinson Santos Xavier <isoron@gmail.com>
+ *
+ * This file is part of Loop Habit Tracker.
+ *
+ * Loop Habit Tracker is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by the
+ * Free Software Foundation, either version 3 of the License, or (at your
+ * option) any later version.
+ *
+ * Loop Habit Tracker is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package org.isoron.uhabits.models.sqlite;
+
+import android.database.sqlite.*;
+import android.support.test.runner.*;
+import android.test.suitebuilder.annotation.*;
+
+import org.apache.commons.lang3.builder.*;
+import org.isoron.androidbase.storage.*;
+import org.isoron.uhabits.*;
+import org.isoron.uhabits.utils.*;
+import org.junit.*;
+import org.junit.runner.*;
+
+import static org.hamcrest.core.IsEqual.*;
+import static org.junit.Assert.assertThat;
+
+@RunWith(AndroidJUnit4.class)
+@MediumTest
+public class SQLiteRepositoryTest extends BaseAndroidTest
+{
+    private SQLiteRepository<ThingRecord> repository;
+
+    private SQLiteDatabase db;
+
+    @Before
+    @Override
+    public void setUp()
+    {
+        super.setUp();
+        this.db = DatabaseUtils.openDatabase();
+        repository = new SQLiteRepository<>(ThingRecord.class, db);
+
+        db.execSQL("drop table if exists tests");
+        db.execSQL("create table tests(" +
+                   "id integer not null primary key autoincrement, " +
+                   "color_number integer not null, score float not null, " +
+                   "name string not null)");
+    }
+
+    @Test
+    public void testFind() throws Exception
+    {
+        db.execSQL("insert into tests(id, color_number, name, score) " +
+                   "values (10, 20, 'hello', 8.0)");
+
+        ThingRecord record = repository.find(10L);
+
+        assertNotNull(record);
+        assertThat(record.id, equalTo(10L));
+        assertThat(record.color, equalTo(20));
+        assertThat(record.name, equalTo("hello"));
+        assertThat(record.score, equalTo(8.0));
+    }
+
+    @Test
+    public void testSave_withId() throws Exception
+    {
+        ThingRecord record = new ThingRecord();
+        record.id = 50L;
+        record.color = 10;
+        record.name = "hello";
+        record.score = 5.0;
+        repository.save(record);
+        assertThat(record, equalTo(repository.find(50L)));
+
+        record.name = "world";
+        record.score = 128.0;
+        repository.save(record);
+        assertThat(record, equalTo(repository.find(50L)));
+    }
+
+    @Test
+    public void testSave_withoutId() throws Exception
+    {
+        ThingRecord r1 = new ThingRecord();
+        r1.color = 10;
+        r1.name = "hello";
+        r1.score = 16.0;
+        repository.save(r1);
+
+        ThingRecord r2 = new ThingRecord();
+        r2.color = 20;
+        r2.name = "world";
+        r2.score = 2.0;
+        repository.save(r2);
+
+        assertThat(r1.id, equalTo(1L));
+        assertThat(r2.id, equalTo(2L));
+    }
+
+    @Test
+    public void testRemove() throws Exception
+    {
+        ThingRecord rec1 = new ThingRecord();
+        rec1.color = 10;
+        rec1.name = "hello";
+        rec1.score = 16.0;
+        repository.save(rec1);
+
+        ThingRecord rec2 = new ThingRecord();
+        rec2.color = 20;
+        rec2.name = "world";
+        rec2.score = 32.0;
+        repository.save(rec2);
+
+        long id = rec1.id;
+        assertThat(rec1, equalTo(repository.find(id)));
+        assertThat(rec2, equalTo(repository.find(rec2.id)));
+
+        repository.remove(rec1);
+        assertThat(rec1.id, equalTo(null));
+        assertNull(repository.find(id));
+        assertThat(rec2, equalTo(repository.find(rec2.id)));
+
+        repository.remove(rec1); // should have no effect
+        assertNull(repository.find(id));
+    }
+}
+
+@Table(name = "tests")
+class ThingRecord
+{
+    @Column
+    public Long id;
+
+    @Column
+    public String name;
+
+    @Column(name = "color_number")
+    public Integer color;
+
+    @Column
+    public Double score;
+
+    @Override
+    public boolean equals(Object o)
+    {
+        if (this == o) return true;
+
+        if (o == null || getClass() != o.getClass()) return false;
+
+        ThingRecord record = (ThingRecord) o;
+
+        return new EqualsBuilder()
+            .append(id, record.id)
+            .append(name, record.name)
+            .append(color, record.color)
+            .isEquals();
+    }
+
+    @Override
+    public int hashCode()
+    {
+        return new HashCodeBuilder(17, 37)
+            .append(id)
+            .append(name)
+            .append(color)
+            .toHashCode();
+    }
+
+    @Override
+    public String toString()
+    {
+        return new ToStringBuilder(this)
+            .append("id", id)
+            .append("name", name)
+            .append("color", color)
+            .toString();
+    }
+}

uhabits-android/src/main/assets/migrations/11.sql

@@ -1 +1 @@
-alter table habits add column reminder_days integer not null default 127;
+alter table Habits add column reminder_days integer not null default 127;

uhabits-android/src/main/assets/migrations/13.sql

@@ -1,4 +1,4 @@
-create index idx_score_habit_timestamp on score(habit, timestamp);
-create index idx_checkmark_habit_timestamp on checkmarks(habit, timestamp);
-create index idx_repetitions_habit_timestamp on repetitions(habit, timestamp);
-create index idx_streak_habit_end on streak(habit, end);
+create index idx_score_habit_timestamp on Score(habit, timestamp);
+create index idx_checkmark_habit_timestamp on Checkmarks(habit, timestamp);
+create index idx_repetitions_habit_timestamp on Repetitions(habit, timestamp);
+create index idx_streak_habit_end on Streak(habit, end);

uhabits-android/src/main/assets/migrations/17.sql

@@ -1,5 +1,11 @@
-DROP TABLE Score;
-CREATE TABLE Score (Id INTEGER PRIMARY KEY AUTOINCREMENT, habit INTEGER REFERENCES Habits(Id), score REAL, timestamp INTEGER);
-CREATE INDEX idx_score_habit_timestamp on score(habit, timestamp);
-delete from Streak;
-delete from Checkmarks;
+drop table Score;
+create table Score (
+    id integer primary key autoincrement,
+    habit integer references habits(id),
+    score real,
+    timestamp integer);
+
+create index idx_score_habit_timestamp on Score(habit, timestamp);
+
+delete from streak;
+delete from checkmarks;

uhabits-android/src/main/assets/migrations/19.sql

@@ -0,0 +1,6 @@
+create table Events (
+    id integer primary key autoincrement,
+    timestamp integer,
+    message text,
+    server_id integer
+);

uhabits-android/src/main/assets/migrations/5.sql

@@ -1,2 +0,0 @@
-alter table habits add column reminder_hour integer;
-alter table habits add column reminder_min integer;

uhabits-android/src/main/assets/migrations/6.sql

@@ -1 +0,0 @@
-alter table habits add column highlight integer not null default 0;

uhabits-android/src/main/assets/migrations/7.sql

@@ -1 +0,0 @@
-alter table habits add column archived integer not null default 0;

uhabits-android/src/main/assets/migrations/9.sql

@@ -0,0 +1,41 @@
+create table Habits (
+    id integer primary key autoincrement,
+    archived integer,
+    color integer,
+    description text,
+    freq_den integer,
+    freq_num integer,
+    highlight integer,
+    name text,
+    position integer,
+    reminder_hour integer,
+    reminder_min integer
+);
+
+create table Checkmarks (
+    id integer primary key autoincrement,
+    habit integer references habits(id),
+    timestamp integer,
+    value integer
+);
+
+create table Repetitions (
+    id integer primary key autoincrement,
+    habit integer references habits(id),
+    timestamp integer
+);
+
+create table Streak (
+    id integer primary key autoincrement,
+    end integer,
+    habit integer references habits(id),
+    length integer,
+    start integer
+);
+
+create table Score (
+    id integer primary key autoincrement,
+    habit integer references habits(id),
+    score integer,
+    timestamp integer
+);

uhabits-android/src/main/java/org/isoron/uhabits/HabitsApplication.java

@@ -22,8 +22,6 @@ package org.isoron.uhabits;
 import android.app.*;
 import android.content.*;
 
-import com.activeandroid.*;
-
 import org.isoron.androidbase.*;
 import org.isoron.uhabits.core.preferences.*;
 import org.isoron.uhabits.core.reminders.*;
@@ -92,13 +90,13 @@ public class HabitsApplication extends Application
 
         try
         {
-            DatabaseUtils.initializeActiveAndroid(context);
+            DatabaseUtils.initializeDatabase(context);
         }
         catch (InvalidDatabaseVersionException e)
         {
             File db = DatabaseUtils.getDatabaseFile(context);
             db.renameTo(new File(db.getAbsolutePath() + ".invalid"));
-            DatabaseUtils.initializeActiveAndroid(context);
+            DatabaseUtils.initializeDatabase(context);
         }
 
         widgetUpdater = component.getWidgetUpdater();
@@ -124,8 +122,6 @@ public class HabitsApplication extends Application
     public void onTerminate()
     {
         context = null;
-        ActiveAndroid.dispose();
-
         reminderScheduler.stopListening();
         widgetUpdater.stopListening();
         notificationTray.stopListening();

uhabits-android/src/main/java/org/isoron/uhabits/HabitsDatabaseOpener.java

@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 2017 Álinson Santos Xavier <isoron@gmail.com>
+ *
+ * This file is part of Loop Habit Tracker.
+ *
+ * Loop Habit Tracker is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by the
+ * Free Software Foundation, either version 3 of the License, or (at your
+ * option) any later version.
+ *
+ * Loop Habit Tracker is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ *
+ */
+
+package org.isoron.uhabits;
+
+import android.content.*;
+import android.database.sqlite.*;
+
+import org.isoron.androidbase.storage.*;
+
+
+public class HabitsDatabaseOpener extends BaseSQLiteOpenHelper
+{
+    private final int version;
+
+    public HabitsDatabaseOpener(Context context,
+                                String databaseFilename,
+                                int version)
+    {
+        super(context, databaseFilename, version);
+        this.version = version;
+    }
+
+    @Override
+    public void onCreate(SQLiteDatabase db)
+    {
+        onUpgrade(db, 8, version);
+    }
+
+    @Override
+    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion)
+    {
+        if(oldVersion < 8) throw new UnsupportedDatabaseVersionException();
+        super.onUpgrade(db, oldVersion, newVersion);
+    }
+}

uhabits-android/src/main/java/org/isoron/uhabits/io/HabitBullCSVImporter.java

@@ -21,7 +21,6 @@ package org.isoron.uhabits.io;
 
 import android.support.annotation.*;
 
-import com.activeandroid.*;
 import com.opencsv.*;
 
 import org.isoron.uhabits.core.models.*;
@@ -32,6 +31,8 @@ import java.util.*;
 
 import javax.inject.*;
 
+import static org.isoron.uhabits.utils.DatabaseUtils.executeAsTransaction;
+
 /**
  * Class that imports data from HabitBull CSV files.
  */
@@ -59,16 +60,7 @@ public class HabitBullCSVImporter extends AbstractImporter
     @Override
     public void importHabitsFromFile(@NonNull final File file) throws IOException
     {
-        ActiveAndroid.beginTransaction();
-        try
-        {
-            parseFile(file);
-            ActiveAndroid.setTransactionSuccessful();
-        }
-        finally
-        {
-            ActiveAndroid.endTransaction();
-        }
+        executeAsTransaction(() -> parseFile(file));
     }
 
     private void parseFile(@NonNull File file) throws IOException

uhabits-android/src/main/java/org/isoron/uhabits/io/LoopDBImporter.java

@@ -25,8 +25,6 @@ import android.database.sqlite.*;
 import android.support.annotation.*;
 import android.util.*;
 
-import com.activeandroid.*;
-
 import org.isoron.androidbase.*;
 import org.isoron.androidbase.utils.*;
 import org.isoron.uhabits.BuildConfig;
@@ -89,9 +87,9 @@ public class LoopDBImporter extends AbstractImporter
     @Override
     public void importHabitsFromFile(@NonNull File file) throws IOException
     {
-        ActiveAndroid.dispose();
+        DatabaseUtils.dispose();
         File originalDB = DatabaseUtils.getDatabaseFile(context);
         FileUtils.copy(file, originalDB);
-        DatabaseUtils.initializeActiveAndroid(context);
+        DatabaseUtils.initializeDatabase(context);
     }
 }

uhabits-android/src/main/java/org/isoron/uhabits/models/sqlite/SQLModelFactory.java

@@ -39,9 +39,9 @@ public class SQLModelFactory implements ModelFactory
 
     @Provides
     @AppScope
-    public static HabitList provideHabitList()
+    public static HabitList provideHabitList(ModelFactory modelFactory)
     {
-        return SQLiteHabitList.getInstance(provideModelFactory());
+        return new SQLiteHabitList(modelFactory);
     }
 
     @Override

uhabits-android/src/main/java/org/isoron/uhabits/models/sqlite/SQLiteHabitList.java

@@ -19,55 +19,60 @@
 
 package org.isoron.uhabits.models.sqlite;
 
+import android.database.sqlite.*;
 import android.support.annotation.*;
 
-import com.activeandroid.query.*;
-import com.activeandroid.util.*;
-
-import org.apache.commons.lang3.*;
+import org.isoron.androidbase.storage.*;
 import org.isoron.uhabits.core.models.*;
+import org.isoron.uhabits.core.models.memory.*;
 import org.isoron.uhabits.models.sqlite.records.*;
+import org.isoron.uhabits.utils.*;
 
 import java.util.*;
 
+import static org.isoron.uhabits.utils.DatabaseUtils.executeAsTransaction;
+
 /**
  * Implementation of a {@link HabitList} that is backed by SQLite.
  */
 public class SQLiteHabitList extends HabitList
 {
-    private static HashMap<Long, Habit> cache;
-
     private static SQLiteHabitList instance;
 
     @NonNull
-    private final SQLiteUtils<HabitRecord> sqlite;
+    private final SQLiteRepository<HabitRecord> repository;
 
     @NonNull
     private final ModelFactory modelFactory;
 
     @NonNull
-    private Order order;
+    private final MemoryHabitList list;
+
+    private boolean loaded = false;
 
     public SQLiteHabitList(@NonNull ModelFactory modelFactory)
     {
         super();
         this.modelFactory = modelFactory;
+        this.list = new MemoryHabitList();
 
-        if (cache == null) cache = new HashMap<>();
-        sqlite = new SQLiteUtils<>(HabitRecord.class);
-        order = Order.BY_POSITION;
+        repository =
+            new SQLiteRepository<>(HabitRecord.class, DatabaseUtils.openDatabase());
     }
 
-    protected SQLiteHabitList(@NonNull ModelFactory modelFactory,
-                              @NonNull HabitMatcher filter,
-                              @NonNull Order order)
+    private void loadRecords()
     {
-        super(filter);
-        this.modelFactory = modelFactory;
+        if(loaded) return;
+        loaded = true;
 
-        if (cache == null) cache = new HashMap<>();
-        sqlite = new SQLiteUtils<>(HabitRecord.class);
-        this.order = order;
+        list.removeAll();
+        List<HabitRecord> records = repository.findAll("order by position");
+        for (HabitRecord rec : records)
+        {
+            Habit h = modelFactory.buildHabit();
+            rec.copyTo(h);
+            list.add(h);
+        }
     }
 
     public static SQLiteHabitList getInstance(
@@ -78,127 +83,123 @@ public class SQLiteHabitList extends HabitList
     }
 
     @Override
-    public void add(@NonNull Habit habit)
+    public synchronized void add(@NonNull Habit habit)
     {
-        if (cache.containsValue(habit))
-            throw new IllegalArgumentException("habit already added");
+        loadRecords();
+        list.add(habit);
 
         HabitRecord record = new HabitRecord();
         record.copyFrom(habit);
-        record.position = size();
+        record.position = list.indexOf(habit);
+        repository.save(record);
 
-        Long id = habit.getId();
-        if (id == null) id = record.save();
-        else record.save(id);
-
-        if (id < 0)
-            throw new IllegalArgumentException("habit could not be saved");
-
-        habit.setId(id);
-        cache.put(id, habit);
+        getObservable().notifyListeners();
     }
 
     @Override
     @Nullable
     public Habit getById(long id)
     {
-        if (!cache.containsKey(id))
-        {
-            HabitRecord record = HabitRecord.get(id);
-            if (record == null) return null;
-
-            Habit habit = modelFactory.buildHabit();
-            record.copyTo(habit);
-            cache.put(id, habit);
-        }
-
-        return cache.get(id);
+        loadRecords();
+        return list.getById(id);
     }
 
     @Override
     @NonNull
     public Habit getByPosition(int position)
     {
-        return toList().get(position);
+        loadRecords();
+        return list.getByPosition(position);
     }
 
     @NonNull
     @Override
     public HabitList getFiltered(HabitMatcher filter)
     {
-        return new SQLiteHabitList(modelFactory, filter, order);
+        loadRecords();
+        return list.getFiltered(filter);
     }
 
     @Override
     @NonNull
     public Order getOrder()
     {
-        return order;
+        return list.getOrder();
     }
 
     @Override
     public void setOrder(@NonNull Order order)
     {
-        this.order = order;
+        list.setOrder(order);
     }
 
     @Override
     public int indexOf(@NonNull Habit h)
     {
-        return toList().indexOf(h);
+        loadRecords();
+        return list.indexOf(h);
     }
 
     @Override
     public Iterator<Habit> iterator()
     {
-        return Collections.unmodifiableCollection(toList()).iterator();
+        loadRecords();
+        return list.iterator();
     }
 
-    public void rebuildOrder()
+    private void rebuildOrder()
     {
-        List<Habit> habits = toList();
-
-        int i = 0;
-        for (Habit h : habits)
-        {
-            HabitRecord record = HabitRecord.get(h.getId());
-            if (record == null)
-                throw new RuntimeException("habit not in database");
-
-            record.position = i++;
-            record.save();
-        }
-
-        update(habits);
+//        List<Habit> habits = toList();
+//
+//        int i = 0;
+//        for (Habit h : habits)
+//        {
+//            HabitRecord record = repository.find(h.getId());
+//            if (record == null)
+//                throw new RuntimeException("habit not in database");
+//
+//            record.position = i++;
+//            repository.save(record);
+//        }
+//
+//        update(habits);
     }
 
     @Override
-    public void remove(@NonNull Habit habit)
+    public synchronized void remove(@NonNull Habit habit)
     {
-        if (!cache.containsKey(habit.getId()))
-            throw new RuntimeException("habit not in cache");
+        loadRecords();
+        list.remove(habit);
 
-        cache.remove(habit.getId());
-        HabitRecord record = HabitRecord.get(habit.getId());
+        HabitRecord record = repository.find(habit.getId());
         if (record == null) throw new RuntimeException("habit not in database");
-        record.cascadeDelete();
+        executeAsTransaction(() ->
+        {
+            ((SQLiteRepetitionList) habit.getRepetitions()).removeAll();
+            repository.remove(record);
+        });
         rebuildOrder();
+        getObservable().notifyListeners();
     }
 
     @Override
-    public void removeAll()
+    public synchronized void removeAll()
     {
-        sqlite.query("delete from repetitions", null);
-        sqlite.query("delete from habits", null);
+        list.removeAll();
+        SQLiteDatabase db = DatabaseUtils.openDatabase();
+        db.execSQL("delete from habits");
+        db.execSQL("delete from repetitions");
+        getObservable().notifyListeners();
     }
 
     @Override
-    public synchronized void reorder(Habit from, Habit to)
+    public synchronized void reorder(@NonNull Habit from, @NonNull Habit to)
     {
-        if (from == to) return;
+        loadRecords();
+        list.reorder(from, to);
 
-        HabitRecord fromRecord = HabitRecord.get(from.getId());
-        HabitRecord toRecord = HabitRecord.get(to.getId());
+        HabitRecord fromRecord = repository.find(from.getId());
+        HabitRecord toRecord = repository.find(to.getId());
 
         if (fromRecord == null)
             throw new RuntimeException("habit not in database");
@@ -207,128 +208,59 @@ public class SQLiteHabitList extends HabitList
 
         Integer fromPos = fromRecord.position;
         Integer toPos = toRecord.position;
-
-        Log.d("SQLiteHabitList",
-            String.format("reorder: %d %d", fromPos, toPos));
-
+        SQLiteDatabase db = DatabaseUtils.openDatabase();
         if (toPos < fromPos)
         {
-            new Update(HabitRecord.class)
-                .set("position = position + 1")
-                .where("position >= ? and position < ?", toPos, fromPos)
-                .execute();
+            db.execSQL("update habits set position = position + 1 " +
+                       "where position >= ? and position < ?",
+                new String[]{ toPos.toString(), fromPos.toString() });
         }
         else
         {
-            new Update(HabitRecord.class)
-                .set("position = position - 1")
-                .where("position > ? and position <= ?", fromPos, toPos)
-                .execute();
+            db.execSQL("update habits set position = position - 1 " +
+                       "where position > ? and position <= ?",
+                new String[]{ fromPos.toString(), toPos.toString() });
         }
 
         fromRecord.position = toPos;
-        fromRecord.save();
+        repository.save(fromRecord);
         update(from);
+
         getObservable().notifyListeners();
     }
 
     @Override
     public void repair()
     {
-        super.repair();
+        loadRecords();
         rebuildOrder();
     }
 
     @Override
     public int size()
     {
-        return toList().size();
+        loadRecords();
+        return list.size();
     }
 
     @Override
-    public void update(List<Habit> habits)
+    public synchronized void update(List<Habit> habits)
     {
+        loadRecords();
         for (Habit h : habits)
         {
-            HabitRecord record = HabitRecord.get(h.getId());
+            HabitRecord record = repository.find(h.getId());
             if (record == null)
                 throw new RuntimeException("habit not in database");
             record.copyFrom(h);
-            record.save();
-        }
-    }
-
-    public synchronized List<Habit> toList()
-    {
-        String query = buildSelectQuery();
-        List<HabitRecord> recordList = sqlite.query(query, null);
-
-        List<Habit> habits = new LinkedList<>();
-        for (HabitRecord record : recordList)
-        {
-            Habit habit = getById(record.getId());
-            if (habit == null) continue;
-            if (!filter.matches(habit)) continue;
-            habits.add(habit);
-        }
-
-        if(order == Order.BY_SCORE)
-        {
-            Collections.sort(habits, (lhs, rhs) -> {
-                double s1 = lhs.getScores().getTodayValue();
-                double s2 = rhs.getScores().getTodayValue();
-                return Double.compare(s2, s1);
-            });
-        }
-
-        return habits;
+            repository.save(record);
         }
 
-    private void appendOrderBy(StringBuilder query)
-    {
-        switch (order)
-        {
-            case BY_POSITION:
-                query.append("order by position ");
-                break;
-
-            case BY_NAME:
-            case BY_SCORE:
-                query.append("order by name ");
-                break;
-
-            case BY_COLOR:
-                query.append("order by color, name ");
-                break;
-
-            default:
-                throw new IllegalStateException();
-        }
-    }
-
-    private void appendSelect(StringBuilder query)
-    {
-        query.append(HabitRecord.SELECT);
-    }
-
-    private void appendWhere(StringBuilder query)
-    {
-        ArrayList<Object> where = new ArrayList<>();
-        if (filter.isReminderRequired()) where.add("reminder_hour is not null");
-        if (!filter.isArchivedAllowed()) where.add("archived = 0");
-
-        if (where.isEmpty()) return;
-        query.append("where ");
-        query.append(StringUtils.join(where, " and "));
-        query.append(" ");
+        getObservable().notifyListeners();
     }
 
-    private String buildSelectQuery()
+    public void reload()
     {
-        StringBuilder query = new StringBuilder();
-        appendSelect(query);
-        appendWhere(query);
-        appendOrderBy(query);
-        return query.toString();
+        loaded = false;
     }
 }

uhabits-android/src/main/java/org/isoron/uhabits/models/sqlite/SQLiteRepetitionList.java

@@ -19,16 +19,14 @@
 
 package org.isoron.uhabits.models.sqlite;
 
-import android.database.*;
-import android.database.sqlite.*;
 import android.support.annotation.*;
 import android.support.annotation.Nullable;
 
-import com.activeandroid.*;
-import com.activeandroid.query.*;
-
+import org.isoron.androidbase.storage.*;
 import org.isoron.uhabits.core.models.*;
+import org.isoron.uhabits.core.models.memory.*;
 import org.isoron.uhabits.models.sqlite.records.*;
+import org.isoron.uhabits.utils.*;
 import org.jetbrains.annotations.*;
 
 import java.util.*;
@@ -38,165 +36,112 @@ import java.util.*;
  */
 public class SQLiteRepetitionList extends RepetitionList
 {
+    private final SQLiteRepository<RepetitionRecord> repository;
 
-    private final SQLiteUtils<RepetitionRecord> sqlite;
-
-    @Nullable
-    private HabitRecord habitRecord;
-
-    private SQLiteStatement addStatement;
+    private final MemoryRepetitionList list;
 
-    public static final String ADD_QUERY =
-        "insert into repetitions(habit, timestamp, value) " +
-        "values (?,?,?)";
+    private boolean loaded = false;
 
     public SQLiteRepetitionList(@NonNull Habit habit)
     {
         super(habit);
-        sqlite = new SQLiteUtils<>(RepetitionRecord.class);
+        repository = new SQLiteRepository<>(RepetitionRecord.class,
+            DatabaseUtils.openDatabase());
+        list = new MemoryRepetitionList(habit);
+    }
+
+    private void loadRecords()
+    {
+        if (loaded) return;
+        loaded = true;
+
+        check(habit.getId());
+        List<RepetitionRecord> records =
+            repository.findAll("where habit = ? order by timestamp",
+                habit.getId().toString());
 
-        SQLiteDatabase db = Cache.openDatabase();
-        addStatement = db.compileStatement(ADD_QUERY);
+        for (RepetitionRecord rec : records)
+            list.add(rec.toRepetition());
     }
 
-    /**
-     * Adds a repetition to the global SQLite database.
-     * <p>
-     * Given a repetition, this creates and saves the corresponding
-     * RepetitionRecord to the database.
-     *
-     * @param rep the repetition to be added
-     */
     @Override
     public void add(Repetition rep)
     {
+        loadRecords();
+        list.add(rep);
         check(habit.getId());
-        addStatement.bindLong(1, habit.getId());
-        addStatement.bindLong(2, rep.getTimestamp());
-        addStatement.bindLong(3, rep.getValue());
-        addStatement.execute();
+        RepetitionRecord record = new RepetitionRecord();
+        record.habit_id = habit.getId();
+        record.copyFrom(rep);
+        repository.save(record);
         observable.notifyListeners();
     }
 
     @Override
     public List<Repetition> getByInterval(long timeFrom, long timeTo)
     {
-        check(habit.getId());
-        String query = "select habit, timestamp, value " +
-                       "from Repetitions " +
-                       "where habit = ? and timestamp >= ? and timestamp <= ? " +
-                       "order by timestamp";
-
-        String params[] = {
-            Long.toString(habit.getId()),
-            Long.toString(timeFrom),
-            Long.toString(timeTo)
-        };
-
-        List<RepetitionRecord> records = sqlite.query(query, params);
-        return toRepetitions(records);
+        loadRecords();
+        return list.getByInterval(timeFrom, timeTo);
     }
 
     @Override
     @Nullable
     public Repetition getByTimestamp(long timestamp)
     {
-        check(habit.getId());
-        String query = "select habit, timestamp, value " +
-                       "from Repetitions " +
-                       "where habit = ? and timestamp = ? " +
-                       "limit 1";
-
-        String params[] =
-            { Long.toString(habit.getId()), Long.toString(timestamp) };
-
-        RepetitionRecord record = sqlite.querySingle(query, params);
-        if (record == null) return null;
-        record.habit = habitRecord;
-        return record.toRepetition();
+        loadRecords();
+        return list.getByTimestamp(timestamp);
     }
 
     @Override
     public Repetition getOldest()
     {
-        check(habit.getId());
-        String query = "select habit, timestamp, value " +
-                       "from Repetitions " +
-                       "where habit = ? " +
-                       "order by timestamp asc " +
-                       "limit 1";
-
-        String params[] = { Long.toString(habit.getId()) };
-
-        RepetitionRecord record = sqlite.querySingle(query, params);
-        if (record == null) return null;
-        record.habit = habitRecord;
-        return record.toRepetition();
+        loadRecords();
+        return list.getOldest();
     }
 
     @Override
     public Repetition getNewest()
     {
-        check(habit.getId());
-        String query = "select habit, timestamp, value " +
-                "from Repetitions " +
-                "where habit = ? " +
-                "order by timestamp desc " +
-                "limit 1";
-
-        String params[] = { Long.toString(habit.getId()) };
-
-        RepetitionRecord record = sqlite.querySingle(query, params);
-        if (record == null) return null;
-        record.habit = habitRecord;
-        return record.toRepetition();
+        loadRecords();
+        return list.getNewest();
     }
 
     @Override
     public void remove(@NonNull Repetition repetition)
     {
-        new Delete()
-            .from(RepetitionRecord.class)
-            .where("habit = ?", habit.getId())
-            .and("timestamp = ?", repetition.getTimestamp())
-            .execute();
-
+        loadRecords();
+        list.remove(repetition);
+        check(habit.getId());
+        repository.execSQL(
+            "delete from repetitions where habit = ? and timestamp = ?",
+            habit.getId());
         observable.notifyListeners();
     }
 
-    @Contract("null -> fail")
-    private void check(Long id)
-    {
-        if (id == null) throw new RuntimeException("habit is not saved");
-
-        if (habitRecord != null) return;
-
-        habitRecord = HabitRecord.get(id);
-        if (habitRecord == null) throw new RuntimeException("habit not found");
-    }
-
-    @NonNull
-    private List<Repetition> toRepetitions(
-        @NonNull List<RepetitionRecord> records)
+    public void removeAll()
     {
+        loadRecords();
+        list.removeAll();
         check(habit.getId());
+        repository.execSQL("delete from repetitions where habit = ?",
+            habit.getId());
+    }
 
-        List<Repetition> reps = new LinkedList<>();
-        for (RepetitionRecord record : records)
+    @Override
+    public long getTotalCount()
     {
-            record.habit = habitRecord;
-            reps.add(record.toRepetition());
+        loadRecords();
+        return list.getTotalCount();
     }
 
-        return reps;
+    public void reload()
+    {
+        loaded = false;
     }
 
-    @Override
-    public long getTotalCount()
+    @Contract("null -> fail")
+    private void check(Long value)
     {
-        SQLiteDatabase db = Cache.openDatabase();
-
-        return DatabaseUtils.queryNumEntries(db, "Repetitions",
-                "habit=?", new String[] { Long.toString(habit.getId()) });
+        if (value == null) throw new RuntimeException("null check failed");
     }
 }

uhabits-android/src/main/java/org/isoron/uhabits/models/sqlite/SQLiteUtils.java

@@ -1,84 +0,0 @@
-/*
- * Copyright (C) 2016 Álinson Santos Xavier <isoron@gmail.com>
- *
- * This file is part of Loop Habit Tracker.
- *
- * Loop Habit Tracker is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by the
- * Free Software Foundation, either version 3 of the License, or (at your
- * option) any later version.
- *
- * Loop Habit Tracker is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
- * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-package org.isoron.uhabits.models.sqlite;
-
-import android.database.*;
-import android.database.sqlite.*;
-import android.support.annotation.*;
-
-import com.activeandroid.*;
-
-import org.isoron.uhabits.models.sqlite.records.*;
-
-import java.util.*;
-
-public class SQLiteUtils<T extends SQLiteRecord>
-{
-    private Class klass;
-
-    public SQLiteUtils(Class klass)
-    {
-        this.klass = klass;
-    }
-
-    @NonNull
-    public List<T> query(String query, String params[])
-    {
-        SQLiteDatabase db = Cache.openDatabase();
-        try (Cursor c = db.rawQuery(query, params))
-        {
-            return cursorToMultipleRecords(c);
-        }
-    }
-
-    @Nullable
-    public T querySingle(String query, String params[])
-    {
-        SQLiteDatabase db = Cache.openDatabase();
-        try(Cursor c = db.rawQuery(query, params))
-        {
-            if (!c.moveToNext()) return null;
-            return cursorToSingleRecord(c);
-        }
-    }
-
-    @NonNull
-    private List<T> cursorToMultipleRecords(Cursor c)
-    {
-        List<T> records = new LinkedList<>();
-        while (c.moveToNext()) records.add(cursorToSingleRecord(c));
-        return records;
-    }
-
-    @NonNull
-    private T cursorToSingleRecord(Cursor c)
-    {
-        try
-        {
-            T record = (T) klass.newInstance();
-            record.copyFrom(c);
-            return record;
-        }
-        catch (Exception e)
-        {
-            throw new RuntimeException(e);
-        }
-    }
-}

uhabits-android/src/main/java/org/isoron/uhabits/models/sqlite/records/HabitRecord.java

@@ -19,122 +19,67 @@
 
 package org.isoron.uhabits.models.sqlite.records;
 
-import android.annotation.*;
-import android.database.*;
-import android.support.annotation.*;
-
-import com.activeandroid.*;
-import com.activeandroid.annotation.*;
-import com.activeandroid.query.*;
-import com.activeandroid.util.*;
-
+import org.apache.commons.lang3.builder.*;
+import org.isoron.androidbase.storage.*;
 import org.isoron.uhabits.core.models.*;
-import org.isoron.uhabits.utils.DatabaseUtils;
-
-import java.lang.reflect.*;
 
 /**
  * The SQLite database record corresponding to a {@link Habit}.
  */
-@Table(name = "Habits")
-public class HabitRecord extends Model implements SQLiteRecord
+@Table(name = "habits")
+public class HabitRecord
 {
-    public static String SELECT =
-        "select id, color, description, freq_den, freq_num, " +
-        "name, position, reminder_hour, reminder_min, " +
-        "highlight, archived, reminder_days, type, target_type, " +
-        "target_value, unit from habits ";
+    @Column
+    public String description;
 
-    @Column(name = "name")
+    @Column
     public String name;
 
-    @Column(name = "description")
-    public String description;
-
     @Column(name = "freq_num")
-    public int freqNum;
+    public Integer freqNum;
 
     @Column(name = "freq_den")
-    public int freqDen;
+    public Integer freqDen;
 
-    @Column(name = "color")
-    public int color;
+    @Column
+    public Integer color;
 
-    @Column(name = "position")
-    public int position;
+    @Column
+    public Integer position;
 
-    @Nullable
     @Column(name = "reminder_hour")
     public Integer reminderHour;
 
-    @Nullable
     @Column(name = "reminder_min")
     public Integer reminderMin;
 
     @Column(name = "reminder_days")
-    public int reminderDays;
+    public Integer reminderDays;
 
-    @Column(name = "highlight")
-    public int highlight;
+    @Column
+    public Integer highlight;
 
-    @Column(name = "archived")
-    public int archived;
+    @Column
+    public Integer archived;
 
-    @Column(name = "type")
-    public int type;
+    @Column
+    public Integer type;
 
     @Column(name = "target_value")
-    public double targetValue;
+    public Double targetValue;
 
     @Column(name = "target_type")
-    public int targetType;
+    public Integer targetType;
 
-    @Column(name = "unit")
+    @Column
     public String unit;
 
-    public HabitRecord()
-    {
-    }
-
-    @Nullable
-    public static HabitRecord get(long id)
-    {
-        return HabitRecord.load(HabitRecord.class, id);
-    }
-
-    /**
-     * Changes the id of a habit on the database.
-     *
-     * @param oldId the original id
-     * @param newId the new id
-     */
-    @SuppressLint("DefaultLocale")
-    public static void updateId(long oldId, long newId)
-    {
-        SQLiteUtils.execSql(
-            String.format("update Habits set Id = %d where Id = %d", newId,
-                oldId));
-    }
-
-    /**
-     * Deletes the habit and all data associated to it, including checkmarks,
-     * repetitions and scores.
-     */
-    public void cascadeDelete()
-    {
-        Long id = getId();
-
-        DatabaseUtils.executeAsTransaction(() -> {
-            new Delete()
-                .from(RepetitionRecord.class)
-                .where("habit = ?", id)
-                .execute();
-            delete();
-        });
-    }
+    @Column
+    public Long id;
 
     public void copyFrom(Habit model)
     {
+        this.id = model.getId();
         this.name = model.getName();
         this.description = model.getDescription();
         this.highlight = 0;
@@ -161,35 +106,14 @@ public class HabitRecord extends Model implements SQLiteRecord
         }
     }
 
-    @Override
-    public void copyFrom(Cursor c)
-    {
-        setId(c.getLong(0));
-        color = c.getInt(1);
-        description = c.getString(2);
-        freqDen = c.getInt(3);
-        freqNum = c.getInt(4);
-        name = c.getString(5);
-        position = c.getInt(6);
-        reminderHour = c.getInt(7);
-        reminderMin = c.getInt(8);
-        highlight = c.getInt(9);
-        archived = c.getInt(10);
-        reminderDays = c.getInt(11);
-        type = c.getInt(12);
-        targetType = c.getInt(13);
-        targetValue = c.getDouble(14);
-        unit = c.getString(15);
-    }
-
     public void copyTo(Habit habit)
     {
+        habit.setId(this.id);
         habit.setName(this.name);
         habit.setDescription(this.description);
         habit.setFrequency(new Frequency(this.freqNum, this.freqDen));
         habit.setColor(this.color);
         habit.setArchived(this.archived != 0);
-        habit.setId(this.getId());
         habit.setType(this.type);
         habit.setTargetType(this.targetType);
         habit.setTargetValue(this.targetValue);
@@ -202,28 +126,77 @@ public class HabitRecord extends Model implements SQLiteRecord
         }
     }
 
-    /**
-     * Saves the habit on the database, and assigns the specified id to it.
-     *
-     * @param id the id that the habit should receive
-     */
-    public void save(long id)
+    @Override
+    public boolean equals(Object o)
     {
-        save();
-        updateId(getId(), id);
+        if (this == o) return true;
+
+        if (o == null || getClass() != o.getClass()) return false;
+
+        HabitRecord that = (HabitRecord) o;
+
+        return new EqualsBuilder()
+            .appendSuper(super.equals(o))
+            .append(freqNum, that.freqNum)
+            .append(freqDen, that.freqDen)
+            .append(color, that.color)
+            .append(position, that.position)
+            .append(reminderDays, that.reminderDays)
+            .append(highlight, that.highlight)
+            .append(archived, that.archived)
+            .append(type, that.type)
+            .append(targetValue, that.targetValue)
+            .append(targetType, that.targetType)
+            .append(name, that.name)
+            .append(description, that.description)
+            .append(reminderHour, that.reminderHour)
+            .append(reminderMin, that.reminderMin)
+            .append(unit, that.unit)
+            .isEquals();
     }
 
-    private void setId(Long id)
-    {
-        try
+    @Override
+    public int hashCode()
     {
-            Field f = (Model.class).getDeclaredField("mId");
-            f.setAccessible(true);
-            f.set(this, id);
+        return new HashCodeBuilder(17, 37)
+            .appendSuper(super.hashCode())
+            .append(name)
+            .append(description)
+            .append(freqNum)
+            .append(freqDen)
+            .append(color)
+            .append(position)
+            .append(reminderHour)
+            .append(reminderMin)
+            .append(reminderDays)
+            .append(highlight)
+            .append(archived)
+            .append(type)
+            .append(targetValue)
+            .append(targetType)
+            .append(unit)
+            .toHashCode();
     }
-        catch (Exception e)
+
+    @Override
+    public String toString()
     {
-            throw new RuntimeException(e);
-        }
+        return new ToStringBuilder(this)
+            .append("name", name)
+            .append("description", description)
+            .append("freqNum", freqNum)
+            .append("freqDen", freqDen)
+            .append("color", color)
+            .append("position", position)
+            .append("reminderHour", reminderHour)
+            .append("reminderMin", reminderMin)
+            .append("reminderDays", reminderDays)
+            .append("highlight", highlight)
+            .append("archived", archived)
+            .append("type", type)
+            .append("targetValue", targetValue)
+            .append("targetType", targetType)
+            .append("unit", unit)
+            .toString();
     }
 }

uhabits-android/src/main/java/org/isoron/uhabits/models/sqlite/records/RepetitionRecord.java

@@ -19,32 +19,28 @@
 
 package org.isoron.uhabits.models.sqlite.records;
 
-import android.database.*;
-
-import com.activeandroid.*;
-import com.activeandroid.annotation.*;
-
+import org.isoron.androidbase.storage.*;
 import org.isoron.uhabits.core.models.*;
 
 /**
  * The SQLite database record corresponding to a {@link Repetition}.
  */
 @Table(name = "Repetitions")
-public class RepetitionRecord extends Model implements SQLiteRecord
+public class RepetitionRecord
 {
-    @Column(name = "habit")
     public HabitRecord habit;
 
-    @Column(name = "timestamp")
+    @Column(name = "habit")
+    public Long habit_id;
+
+    @Column
     public Long timestamp;
 
-    @Column(name = "value")
-    public int value;
+    @Column
+    public Integer value;
 
-    public static RepetitionRecord get(Long id)
-    {
-        return RepetitionRecord.load(RepetitionRecord.class, id);
-    }
+    @Column
+    public Long id;
 
     public void copyFrom(Repetition repetition)
     {
@@ -52,13 +48,6 @@ public class RepetitionRecord extends Model implements SQLiteRecord
         value = repetition.getValue();
     }
 
-    @Override
-    public void copyFrom(Cursor c)
-    {
-        timestamp = c.getLong(1);
-        value = c.getInt(2);
-    }
-
     public Repetition toRepetition()
     {
         return new Repetition(timestamp, value);

uhabits-android/src/main/java/org/isoron/uhabits/sync/Event.java

@@ -19,18 +19,17 @@
 
 package org.isoron.uhabits.sync;
 
-import android.support.annotation.NonNull;
+import android.support.annotation.*;
 
-import com.activeandroid.Model;
-import com.activeandroid.annotation.Column;
-import com.activeandroid.annotation.Table;
-import com.activeandroid.query.Select;
-
-import java.util.List;
+import org.isoron.androidbase.storage.*;
 
 @Table(name = "Events")
-public class Event extends Model
+public class Event
 {
+    @Nullable
+    @Column
+    public Long id;
+
     @NonNull
     @Column(name = "timestamp")
     public Long timestamp;
@@ -56,10 +55,4 @@ public class Event extends Model
         this.timestamp = timestamp;
         this.message = message;
     }
-
-    @NonNull
-    public static List<Event> getAll()
-    {
-        return new Select().from(Event.class).orderBy("timestamp").execute();
-    }
 }

uhabits-android/src/main/java/org/isoron/uhabits/sync/SyncManager.java

@@ -23,10 +23,12 @@ import android.support.annotation.*;
 import android.util.*;
 
 import org.isoron.androidbase.*;
+import org.isoron.androidbase.storage.*;
 import org.isoron.uhabits.BuildConfig;
 import org.isoron.uhabits.core.*;
 import org.isoron.uhabits.core.commands.*;
 import org.isoron.uhabits.core.preferences.*;
+import org.isoron.uhabits.utils.*;
 import org.json.*;
 
 import java.net.*;
@@ -95,6 +97,8 @@ public class SyncManager implements CommandRunner.Listener
 
     private SSLContextProvider sslProvider;
 
+    private final SQLiteRepository<Event> repository;
+
     @Inject
     public SyncManager(@NonNull SSLContextProvider sslProvider,
                        @NonNull Preferences prefs,
@@ -109,8 +113,10 @@ public class SyncManager implements CommandRunner.Listener
         this.commandParser = commandParser;
         this.isListening = false;
 
+        repository =
+            new SQLiteRepository<>(Event.class, DatabaseUtils.openDatabase());
         pendingConfirmation = new LinkedList<>();
-        pendingEmit = new LinkedList<>(Event.getAll());
+        pendingEmit = new LinkedList<>(repository.findAll("order by timestamp"));
 
         groupKey = prefs.getSyncKey();
         clientId = prefs.getSyncClientId();
@@ -129,7 +135,7 @@ public class SyncManager implements CommandRunner.Listener
         JSONObject msg = toJSONObject(command.toJson());
         Long now = new Date().getTime();
         Event e = new Event(command.getId(), now, msg.toString());
-        e.save();
+        repository.save(e);
 
         Log.i("SyncManager", "Adding to outbox: " + msg.toString());
 
@@ -337,7 +343,7 @@ public class SyncManager implements CommandRunner.Listener
                 {
                     Log.i("SyncManager", "Pending command confirmed");
                     pendingConfirmation.remove(e);
-                    e.delete();
+                    repository.remove(e);
                     return;
                 }
             }

uhabits-android/src/main/java/org/isoron/uhabits/utils/DatabaseUtils.java

@@ -20,33 +20,40 @@
 package org.isoron.uhabits.utils;
 
 import android.content.*;
+import android.database.sqlite.*;
 import android.support.annotation.*;
 
-import com.activeandroid.*;
-
 import org.isoron.androidbase.utils.*;
 import org.isoron.uhabits.*;
 import org.isoron.uhabits.core.utils.*;
 import org.isoron.uhabits.models.sqlite.*;
-import org.isoron.uhabits.models.sqlite.records.*;
-import org.isoron.uhabits.sync.*;
 
 import java.io.*;
 import java.text.*;
 
 public abstract class DatabaseUtils
 {
+    @Nullable
+    private static HabitsDatabaseOpener opener = null;
+
     public static void executeAsTransaction(Callback callback)
     {
-        ActiveAndroid.beginTransaction();
+        try (SQLiteDatabase db = openDatabase())
+        {
+            db.beginTransaction();
             try
             {
                 callback.execute();
-            ActiveAndroid.setTransactionSuccessful();
+                db.setTransactionSuccessful();
+            }
+            catch (Exception e)
+            {
+                throw new RuntimeException(e);
             }
             finally
             {
-            ActiveAndroid.endTransaction();
+                db.endTransaction();
+            }
         }
     }
 
@@ -71,17 +78,12 @@ public abstract class DatabaseUtils
     }
 
     @SuppressWarnings("unchecked")
-    public static void initializeActiveAndroid(Context context)
+    public static void initializeDatabase(Context context)
     {
-        Configuration dbConfig = new Configuration.Builder(context)
-            .setDatabaseName(getDatabaseFilename())
-            .setDatabaseVersion(BuildConfig.databaseVersion)
-            .addModelClasses(HabitRecord.class, RepetitionRecord.class,
-                Event.class).create();
-
         try
         {
-            ActiveAndroid.initialize(dbConfig);
+            opener = new HabitsDatabaseOpener(context, getDatabaseFilename(),
+                BuildConfig.databaseVersion);
         }
         catch (RuntimeException e)
         {
@@ -92,7 +94,8 @@ public abstract class DatabaseUtils
     }
 
     @SuppressWarnings("ResultOfMethodCallIgnored")
-    public static String saveDatabaseCopy(Context context, File dir) throws IOException
+    public static String saveDatabaseCopy(Context context, File dir)
+        throws IOException
     {
         SimpleDateFormat dateFormat = DateFormats.getBackupDateFormat();
         String date = dateFormat.format(DateUtils.getLocalTime());
@@ -106,8 +109,20 @@ public abstract class DatabaseUtils
         return dbCopy.getAbsolutePath();
     }
 
+    @NonNull
+    public static SQLiteDatabase openDatabase()
+    {
+        if(opener == null) throw new IllegalStateException();
+        return opener.getWritableDatabase();
+    }
+
+    public static void dispose()
+    {
+        opener = null;
+    }
+
     public interface Callback
     {
-        void execute();
+        void execute() throws Exception;
     }
 }

uhabits-android/src/main/java/org/isoron/uhabits/widgets/BaseWidgetProvider.java

@@ -25,14 +25,15 @@ import android.os.*;
 import android.support.annotation.*;
 import android.widget.*;
 
-import com.activeandroid.util.*;
-
 import org.isoron.uhabits.*;
 import org.isoron.uhabits.core.models.*;
 import org.isoron.uhabits.core.preferences.*;
 
-import static android.appwidget.AppWidgetManager.*;
-import static org.isoron.androidbase.utils.InterfaceUtils.*;
+import static android.appwidget.AppWidgetManager.OPTION_APPWIDGET_MAX_HEIGHT;
+import static android.appwidget.AppWidgetManager.OPTION_APPWIDGET_MAX_WIDTH;
+import static android.appwidget.AppWidgetManager.OPTION_APPWIDGET_MIN_HEIGHT;
+import static android.appwidget.AppWidgetManager.OPTION_APPWIDGET_MIN_WIDTH;
+import static org.isoron.androidbase.utils.InterfaceUtils.dpToPixels;
 
 public abstract class BaseWidgetProvider extends AppWidgetProvider
 {
@@ -109,7 +110,7 @@ public abstract class BaseWidgetProvider extends AppWidgetProvider
             }
             catch (HabitNotFoundException e)
             {
-                Log.e("BaseWidgetProvider", e);
+                e.printStackTrace();
             }
         }
     }

uhabits-core/src/main/java/org/isoron/uhabits/core/models/HabitList.java

@@ -155,7 +155,7 @@ public abstract class HabitList implements Iterable<Habit>
      * @param from the habit that should be moved
      * @param to   the habit that currently occupies the desired position
      */
-    public abstract void reorder(Habit from, Habit to);
+    public abstract void reorder(@NonNull Habit from, @NonNull Habit to);
 
     public void repair()
     {

uhabits-core/src/main/java/org/isoron/uhabits/core/models/RepetitionList.java

@@ -221,4 +221,6 @@ public abstract class RepetitionList
         add(new Repetition(timestamp, value));
         habit.invalidateNewerThan(timestamp);
     }
+
+    public abstract void removeAll();
 }

uhabits-core/src/main/java/org/isoron/uhabits/core/models/memory/MemoryCheckmarkList.java

@@ -22,6 +22,7 @@ package org.isoron.uhabits.core.models.memory;
 import android.support.annotation.*;
 
 import org.isoron.uhabits.core.models.*;
+import org.isoron.uhabits.core.utils.*;
 
 import java.util.*;
 
@@ -60,8 +61,10 @@ public class MemoryCheckmarkList extends CheckmarkList
         Checkmark oldest = getOldestComputed();
         if(newest != null) newestTimestamp = newest.getTimestamp();
         if(oldest != null) oldestTimestamp = oldest.getTimestamp();
+        long days = (newestTimestamp - oldestTimestamp) /
+                   DateUtils.millisecondsInOneDay;
 
-        List<Checkmark> filtered = new LinkedList<>();
+        List<Checkmark> filtered = new ArrayList<>((int) days);
         for(long time = toTimestamp; time >= fromTimestamp; time -= millisecondsInOneDay)
         {
             if(time > newestTimestamp || time < oldestTimestamp)

uhabits-core/src/main/java/org/isoron/uhabits/core/models/memory/MemoryHabitList.java

@@ -25,7 +25,10 @@ import org.isoron.uhabits.core.models.*;
 
 import java.util.*;
 
-import static org.isoron.uhabits.core.models.HabitList.Order.*;
+import static org.isoron.uhabits.core.models.HabitList.Order.BY_COLOR;
+import static org.isoron.uhabits.core.models.HabitList.Order.BY_NAME;
+import static org.isoron.uhabits.core.models.HabitList.Order.BY_POSITION;
+import static org.isoron.uhabits.core.models.HabitList.Order.BY_SCORE;
 
 /**
  * In-memory implementation of {@link HabitList}.
@@ -33,30 +36,37 @@ import static org.isoron.uhabits.core.models.HabitList.Order.*;
 public class MemoryHabitList extends HabitList
 {
     @NonNull
-    private LinkedList<Habit> list;
+    private LinkedList<Habit> list = new LinkedList<>();
 
     private Comparator<Habit> comparator = null;
 
     @NonNull
-    private Order order;
+    private Order order = Order.BY_POSITION;
+
+    @Nullable
+    private MemoryHabitList parent = null;
 
     public MemoryHabitList()
     {
         super();
-        list = new LinkedList<>();
-        order = Order.BY_POSITION;
     }
 
-    protected MemoryHabitList(@NonNull HabitMatcher matcher)
+    protected MemoryHabitList(@NonNull HabitMatcher matcher,
+                              Comparator<Habit> comparator,
+                              @NonNull MemoryHabitList parent)
     {
         super(matcher);
-        list = new LinkedList<>();
-        order = Order.BY_POSITION;
+        this.parent = parent;
+        this.comparator = comparator;
+        parent.getObservable().addListener(this::loadFromParent);
+        loadFromParent();
     }
 
     @Override
-    public void add(@NonNull Habit habit) throws IllegalArgumentException
+    public synchronized void add(@NonNull Habit habit)
+        throws IllegalArgumentException
     {
+        throwIfHasParent();
         if (list.contains(habit))
             throw new IllegalArgumentException("habit already added");
 
@@ -67,14 +77,16 @@ public class MemoryHabitList extends HabitList
         if (id == null) habit.setId((long) list.size());
         list.addLast(habit);
         resort();
+
+        getObservable().notifyListeners();
     }
 
     @Override
-    public Habit getById(long id)
+    public synchronized Habit getById(long id)
     {
         for (Habit h : list)
         {
-            if (h.getId() == null) continue;
+            if (h.getId() == null) throw new IllegalStateException();
             if (h.getId() == id) return h;
         }
         return null;
@@ -82,33 +94,66 @@ public class MemoryHabitList extends HabitList
 
     @NonNull
     @Override
-    public Habit getByPosition(int position)
+    public synchronized Habit getByPosition(int position)
     {
         return list.get(position);
     }
 
     @NonNull
     @Override
-    public HabitList getFiltered(HabitMatcher matcher)
+    public synchronized HabitList getFiltered(HabitMatcher matcher)
     {
-        MemoryHabitList habits = new MemoryHabitList(matcher);
-        habits.comparator = comparator;
-        for (Habit h : this) if (matcher.matches(h)) habits.add(h);
-        return habits;
+        return new MemoryHabitList(matcher, comparator, this);
     }
 
     @Override
-    public Order getOrder()
+    public synchronized Order getOrder()
     {
         return order;
     }
 
+    @Override
+    public synchronized void setOrder(@NonNull Order order)
+    {
+        this.order = order;
+        this.comparator = getComparatorByOrder(order);
+        resort();
+    }
+
+    private Comparator<Habit> getComparatorByOrder(Order order)
+    {
+        Comparator<Habit> nameComparator =
+            (h1, h2) -> h1.getName().compareTo(h2.getName());
+
+        Comparator<Habit> colorComparator = (h1, h2) ->
+        {
+            Integer c1 = h1.getColor();
+            Integer c2 = h2.getColor();
+            if (c1.equals(c2)) return nameComparator.compare(h1, h2);
+            else return c1.compareTo(c2);
+        };
+
+        Comparator<Habit> scoreComparator = (h1, h2) ->
+        {
+            double s1 = h1.getScores().getTodayValue();
+            double s2 = h2.getScores().getTodayValue();
+            return Double.compare(s2, s1);
+        };
+
+        if (order == BY_POSITION) return null;
+        if (order == BY_NAME) return nameComparator;
+        if (order == BY_COLOR) return colorComparator;
+        if (order == BY_SCORE) return scoreComparator;
+        throw new IllegalStateException();
+    }
+
     @Override
     public int indexOf(@NonNull Habit h)
     {
         return list.indexOf(h);
     }
 
+    @NonNull
     @Override
     public Iterator<Habit> iterator()
     {
@@ -116,27 +161,29 @@ public class MemoryHabitList extends HabitList
     }
 
     @Override
-    public void remove(@NonNull Habit habit)
+    public synchronized void remove(@NonNull Habit habit)
     {
+        throwIfHasParent();
         list.remove(habit);
     }
 
     @Override
-    public void reorder(Habit from, Habit to)
+    public synchronized void reorder(@NonNull Habit from, @NonNull Habit to)
     {
+        throwIfHasParent();
+        if (indexOf(from) < 0)
+            throw new IllegalArgumentException(
+                "list does not contain (from) habit");
+
         int toPos = indexOf(to);
+        if (toPos < 0)
+            throw new IllegalArgumentException(
+                "list does not contain (to) habit");
+
         list.remove(from);
         list.add(toPos, from);
     }
 
-    @Override
-    public void setOrder(@NonNull Order order)
-    {
-        this.order = order;
-        this.comparator = getComparatorByOrder(order);
-        resort();
-    }
-
     @Override
     public int size()
     {
@@ -149,32 +196,23 @@ public class MemoryHabitList extends HabitList
         // NOP
     }
 
-    private Comparator<Habit> getComparatorByOrder(Order order)
+    private void throwIfHasParent()
     {
-        Comparator<Habit> nameComparator =
-            (h1, h2) -> h1.getName().compareTo(h2.getName());
-
-        Comparator<Habit> colorComparator = (h1, h2) -> {
-            Integer c1 = h1.getColor();
-            Integer c2 = h2.getColor();
-            if (c1.equals(c2)) return nameComparator.compare(h1, h2);
-            else return c1.compareTo(c2);
-        };
+        if (parent != null) throw new IllegalStateException(
+            "Filtered lists cannot be modified directly. " +
+            "You should modify the parent list instead.");
+    }
 
-        Comparator<Habit> scoreComparator = (h1, h2) -> {
-            double s1 = h1.getScores().getTodayValue();
-            double s2 = h2.getScores().getTodayValue();
-            return Double.compare(s2, s1);
-        };
+    private synchronized void loadFromParent()
+    {
+        if (parent == null) throw new IllegalStateException();
 
-        if (order == BY_POSITION) return null;
-        if (order == BY_NAME) return nameComparator;
-        if (order == BY_COLOR) return colorComparator;
-        if (order == BY_SCORE) return scoreComparator;
-        throw new IllegalStateException();
+        list.clear();
+        for (Habit h : parent) if (filter.matches(h)) list.add(h);
+        resort();
     }
 
-    private void resort()
+    private synchronized void resort()
     {
         if (comparator != null) Collections.sort(list, comparator);
     }

uhabits-core/src/main/java/org/isoron/uhabits/core/models/memory/MemoryRepetitionList.java

@@ -30,12 +30,12 @@ import java.util.*;
  */
 public class MemoryRepetitionList extends RepetitionList
 {
-    LinkedList<Repetition> list;
+    ArrayList<Repetition> list;
 
     public MemoryRepetitionList(Habit habit)
     {
         super(habit);
-        list = new LinkedList<>();
+        list = new ArrayList<>();
     }
 
     @Override
@@ -48,7 +48,7 @@ public class MemoryRepetitionList extends RepetitionList
     @Override
     public List<Repetition> getByInterval(long fromTimestamp, long toTimestamp)
     {
-        LinkedList<Repetition> filtered = new LinkedList<>();
+        ArrayList<Repetition> filtered = new ArrayList<>();
 
         for (Repetition r : list)
         {
@@ -57,7 +57,7 @@ public class MemoryRepetitionList extends RepetitionList
         }
 
         Collections.sort(filtered,
-            (r1, r2) -> (int) (r1.getTimestamp() - r2.getTimestamp()));
+            (r1, r2) -> Long.compare(r1.getTimestamp(), r2.getTimestamp()));
 
         return filtered;
     }
@@ -122,4 +122,10 @@ public class MemoryRepetitionList extends RepetitionList
     {
         return list.size();
     }
+
+    @Override
+    public void removeAll()
+    {
+        list.clear();
+    }
 }

uhabits-core/src/test/java/org/isoron/uhabits/core/models/HabitListTest.java

@@ -19,20 +19,29 @@
 
 package org.isoron.uhabits.core.models;
 
-import org.hamcrest.*;
 import org.isoron.uhabits.*;
 import org.junit.*;
+import org.junit.rules.*;
 
 import java.io.*;
 import java.util.*;
 
+import static junit.framework.TestCase.assertFalse;
+import static junit.framework.TestCase.fail;
 import static org.hamcrest.CoreMatchers.*;
-import static org.isoron.uhabits.core.models.HabitList.Order.*;
-import static org.junit.Assert.*;
+import static org.hamcrest.MatcherAssert.*;
+import static org.isoron.uhabits.core.models.HabitList.Order.BY_COLOR;
+import static org.isoron.uhabits.core.models.HabitList.Order.BY_NAME;
+import static org.isoron.uhabits.core.models.HabitList.Order.BY_POSITION;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertNull;
 
 @SuppressWarnings("JavaDoc")
 public class HabitListTest extends BaseUnitTest
 {
+    @Rule
+    public ExpectedException thrown = ExpectedException.none();
+
     private ArrayList<Habit> habitsArray;
 
     private HabitList activeHabits;
@@ -69,45 +78,41 @@ public class HabitListTest extends BaseUnitTest
     }
 
     @Test
-    public void test_countActive()
+    public void testSize()
     {
+        assertThat(habitList.size(), equalTo(10));
         assertThat(activeHabits.size(), equalTo(6));
+        assertThat(reminderHabits.size(), equalTo(4));
     }
 
     @Test
-    public void test_getByPosition()
+    public void testGetByPosition()
     {
         assertThat(habitList.getByPosition(0), equalTo(habitsArray.get(0)));
         assertThat(habitList.getByPosition(3), equalTo(habitsArray.get(3)));
         assertThat(habitList.getByPosition(9), equalTo(habitsArray.get(9)));
 
         assertThat(activeHabits.getByPosition(0), equalTo(habitsArray.get(2)));
-    }
-
-    @Test
-    public void test_getHabitsWithReminder()
-    {
-        assertThat(reminderHabits.size(), equalTo(4));
         assertThat(reminderHabits.getByPosition(1),
             equalTo(habitsArray.get(3)));
     }
 
     @Test
-    public void test_get_withInvalidId()
+    public void testGetById()
     {
-        assertThat(habitList.getById(100L), is(nullValue()));
+        Habit habit1 = habitsArray.get(0);
+        Habit habit2 = habitList.getById(habit1.getId());
+        assertThat(habit1, equalTo(habit2));
     }
 
     @Test
-    public void test_get_withValidId()
+    public void testGetById_withInvalidId()
     {
-        Habit habit1 = habitsArray.get(0);
-        Habit habit2 = habitList.getById(habit1.getId());
-        assertThat(habit1, equalTo(habit2));
+        assertNull(habitList.getById(100L));
     }
 
     @Test
-    public void test_ordering()
+    public void testOrdering()
     {
         HabitList list = modelFactory.buildHabitList();
         Habit h1 = fixtures.createEmptyHabit();
@@ -155,7 +160,7 @@ public class HabitListTest extends BaseUnitTest
     }
 
     @Test
-    public void test_reorder()
+    public void testReorder()
     {
         int operations[][] = {
             { 5, 2 }, { 3, 7 }, { 4, 4 }, { 3, 2 }
@@ -191,13 +196,16 @@ public class HabitListTest extends BaseUnitTest
     }
 
     @Test
-    public void test_size()
+    public void testReorder_withInvalidArguments() throws Exception
     {
-        assertThat(habitList.size(), equalTo(10));
+        Habit h1 = habitsArray.get(0);
+        Habit h2 = fixtures.createEmptyHabit();
+        thrown.expect(IllegalArgumentException.class);
+        habitList.reorder(h1, h2);
     }
 
     @Test
-    public void test_writeCSV() throws IOException
+    public void testWriteCSV() throws IOException
     {
         HabitList list = modelFactory.buildHabitList();
 
@@ -224,6 +232,43 @@ public class HabitListTest extends BaseUnitTest
         StringWriter writer = new StringWriter();
         list.writeCSV(writer);
 
-        MatcherAssert.assertThat(writer.toString(), equalTo(expectedCSV));
+        assertThat(writer.toString(), equalTo(expectedCSV));
+    }
+
+    @Test
+    public void testAdd() throws Exception
+    {
+        Habit h1 = fixtures.createEmptyHabit();
+        assertFalse(h1.isArchived());
+        assertNull(h1.getId());
+        assertThat(habitList.indexOf(h1), equalTo(-1));
+
+        habitList.add(h1);
+        assertNotNull(h1.getId());
+        assertThat(habitList.indexOf(h1), not(equalTo(-1)));
+        assertThat(activeHabits.indexOf(h1), not(equalTo(-1)));
+    }
+
+    @Test
+    public void testAdd_withFilteredList() throws Exception
+    {
+        thrown.expect(IllegalStateException.class);
+        activeHabits.add(fixtures.createEmptyHabit());
+    }
+
+    @Test
+    public void testRemove_onFilteredList() throws Exception
+    {
+        thrown.expect(IllegalStateException.class);
+        activeHabits.remove(fixtures.createEmptyHabit());
+    }
+
+    @Test
+    public void testReorder_onFilteredList() throws Exception
+    {
+        Habit h1 = fixtures.createEmptyHabit();
+        Habit h2 = fixtures.createEmptyHabit();
+        thrown.expect(IllegalStateException.class);
+        activeHabits.reorder(h1, h2);
     }
 }