Allow user to import full database

Closes #67

app/src/main/java/org/isoron/uhabits/HabitsApplication.java

@@ -20,14 +20,16 @@
 package org.isoron.uhabits;
 
 import android.app.Application;
+import android.content.Context;
 
 import com.activeandroid.ActiveAndroid;
-import com.activeandroid.Configuration;
 
 import org.isoron.uhabits.helpers.DatabaseHelper;
 
 public class HabitsApplication extends Application
 {
+    private static Context context;
+
     private boolean isTestMode()
     {
         try
@@ -41,10 +43,17 @@ public class HabitsApplication extends Application
         }
     }
 
+    public static Context getContext()
+    {
+        return context;
+    }
+
     @Override
     public void onCreate()
     {
         super.onCreate();
+        HabitsApplication.context = this;
+
         String databaseFilename = BuildConfig.databaseFilename;
 
         if (isTestMode())
@@ -53,17 +62,13 @@ public class HabitsApplication extends Application
             DatabaseHelper.deleteDatabase(this, databaseFilename);
         }
 
-        Configuration dbConfig = new Configuration.Builder(this)
-                .setDatabaseName(databaseFilename)
-                .setDatabaseVersion(BuildConfig.databaseVersion)
-                .create();
-
-        ActiveAndroid.initialize(dbConfig);
+        DatabaseHelper.initializeActiveAndroid(this, databaseFilename);
     }
 
     @Override
     public void onTerminate()
     {
+        HabitsApplication.context = null;
         ActiveAndroid.dispose();
         super.onTerminate();
     }

app/src/main/java/org/isoron/uhabits/helpers/DatabaseHelper.java

@@ -5,8 +5,14 @@ import android.support.annotation.NonNull;
 import android.support.annotation.Nullable;
 
 import com.activeandroid.ActiveAndroid;
+import com.activeandroid.Configuration;
 
 import org.isoron.uhabits.BuildConfig;
+import org.isoron.uhabits.models.Checkmark;
+import org.isoron.uhabits.models.Habit;
+import org.isoron.uhabits.models.Repetition;
+import org.isoron.uhabits.models.Score;
+import org.isoron.uhabits.models.Streak;
 
 import java.io.File;
 import java.io.FileInputStream;
@@ -68,7 +74,7 @@ public class DatabaseHelper
     }
 
     @NonNull
-    private static File getDatabaseFile(Context context, String databaseFilename)
+    public static File getDatabaseFile(Context context, String databaseFilename)
     {
         return new File(String.format("%s/../databases/%s",
                     context.getApplicationContext().getFilesDir().getPath(), databaseFilename));
@@ -85,4 +91,17 @@ public class DatabaseHelper
         dir.mkdirs();
         return dir;
     }
+
+    @SuppressWarnings("unchecked")
+    public static void initializeActiveAndroid(Context context, String databaseFilename)
+    {
+        Configuration dbConfig = new Configuration.Builder(context)
+                .setDatabaseName(databaseFilename)
+                .setDatabaseVersion(BuildConfig.databaseVersion)
+                .addModelClasses(Checkmark.class, Habit.class, Repetition.class, Score.class,
+                        Streak.class)
+                .create();
+
+        ActiveAndroid.initialize(dbConfig);
+    }
 }

app/src/main/java/org/isoron/uhabits/io/GenericImporter.java

@@ -33,6 +33,7 @@ public class GenericImporter extends AbstractImporter
     public GenericImporter()
     {
         importers = new LinkedList<>();
+        importers.add(new LoopDBImporter());
         importers.add(new RewireDBImporter());
         importers.add(new TickmateDBImporter());
         importers.add(new HabitBullCSVImporter());

app/src/main/java/org/isoron/uhabits/io/LoopDBImporter.java

@@ -0,0 +1,68 @@
+/*
+ * 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.io;
+
+import android.content.Context;
+import android.database.Cursor;
+import android.database.sqlite.SQLiteDatabase;
+import android.support.annotation.NonNull;
+
+import com.activeandroid.ActiveAndroid;
+
+import org.isoron.uhabits.BuildConfig;
+import org.isoron.uhabits.HabitsApplication;
+import org.isoron.uhabits.helpers.DatabaseHelper;
+
+import java.io.File;
+import java.io.IOException;
+
+public class LoopDBImporter extends AbstractImporter
+{
+    @Override
+    public boolean canHandle(@NonNull File file) throws IOException
+    {
+        if(!isSQLite3File(file)) return false;
+
+        SQLiteDatabase db = SQLiteDatabase.openDatabase(file.getPath(), null,
+                SQLiteDatabase.OPEN_READONLY);
+
+        Cursor c = db.rawQuery("select count(*) from SQLITE_MASTER where name=? or name=?",
+                new String[]{"Checkmarks", "Repetitions"});
+
+        boolean result = (c.moveToFirst() && c.getInt(0) == 2);
+
+        c.close();
+        return result;
+    }
+
+    @Override
+    public void importHabitsFromFile(@NonNull File file) throws IOException
+    {
+        ActiveAndroid.dispose();
+        Context context = HabitsApplication.getContext();
+
+        File originalDB = DatabaseHelper.getDatabaseFile(context, BuildConfig.databaseFilename);
+        File backupDir = DatabaseHelper.getFilesDir(context, "Backups");
+
+        DatabaseHelper.saveDatabaseCopy(context, backupDir);
+        DatabaseHelper.copy(file, originalDB);
+        DatabaseHelper.initializeActiveAndroid(context, BuildConfig.databaseFilename);
+    }
+}