Split files, check command-line arguments

README.md

@@ -0,0 +1,7 @@
+# Dagger 2 examples
+
+This repository contains all the code samples for the series of posts *[A
+Friendly Introduction to Dagger 2][1]*. To compile each example, just navigate
+to the corresponding folder and run `./gradlew build`.
+
+[1]: https://medium.com/@isoron/a-friendly-introduction-to-dagger-2-part-1-dbdf2f3fb17b#.q0ggdnni2

part-1/build.gradle

@@ -1,3 +1,7 @@
+plugins {
+    id "net.ltgt.apt" version "0.7"
+}
+
 apply plugin: 'java'
 apply plugin: 'application'
 
@@ -9,8 +13,8 @@ jar {
 }
 
 dependencies {
-    compile 'com.google.dagger:dagger:2.0.2'
-    compile 'com.google.dagger:dagger-compiler:2.0.2'
+    apt     'com.google.dagger:dagger-compiler:2.6'
+    compile 'com.google.dagger:dagger:2.6'
 }
 
 repositories {

part-2/build.gradle

@@ -0,0 +1,22 @@
+plugins {
+    id "net.ltgt.apt" version "0.7"
+}
+
+apply plugin: 'java'
+apply plugin: 'application'
+
+mainClassName = 'com.example.Application'
+
+jar {
+    baseName = 'dagger2-examples-part1'
+    version = '1.0.0'
+}
+
+dependencies {
+    apt     'com.google.dagger:dagger-compiler:2.6'
+    compile 'com.google.dagger:dagger:2.6'
+}
+
+repositories {
+    jcenter()
+}

part-2/gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,6 @@
+#Sat Jul 30 09:42:30 EDT 2016
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-2.10-bin.zip

part-2/gradlew

@@ -0,0 +1,160 @@
+#!/usr/bin/env bash
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS=""
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn ( ) {
+    echo "$*"
+}
+
+die ( ) {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+esac
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+        JAVACMD="$JAVA_HOME/bin/java"
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin, switch paths to Windows format before running java
+if $cygwin ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=$((i+1))
+    done
+    case $i in
+        (0) set -- ;;
+        (1) set -- "$args0" ;;
+        (2) set -- "$args0" "$args1" ;;
+        (3) set -- "$args0" "$args1" "$args2" ;;
+        (4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Split up the JVM_OPTS And GRADLE_OPTS values into an array, following the shell quoting and substitution rules
+function splitJvmOpts() {
+    JVM_OPTS=("$@")
+}
+eval splitJvmOpts $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS
+JVM_OPTS[${#JVM_OPTS[*]}]="-Dorg.gradle.appname=$APP_BASE_NAME"
+
+exec "$JAVACMD" "${JVM_OPTS[@]}" -classpath "$CLASSPATH" org.gradle.wrapper.GradleWrapperMain "$@"

part-2/gradlew.bat

@@ -0,0 +1,90 @@
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS=
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto init
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto init
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:init
+@rem Get command-line arguments, handling Windowz variants
+
+if not "%OS%" == "Windows_NT" goto win9xME_args
+if "%@eval[2+2]" == "4" goto 4NT_args
+
+:win9xME_args
+@rem Slurp the command line arguments.
+set CMD_LINE_ARGS=
+set _SKIP=2
+
+:win9xME_args_slurp
+if "x%~1" == "x" goto execute
+
+set CMD_LINE_ARGS=%*
+goto execute
+
+:4NT_args
+@rem Get arguments from the 4NT Shell from JP Software
+set CMD_LINE_ARGS=%$
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

part-2/src/main/java/com/acme/GpsSensor.java

@@ -0,0 +1,10 @@
+package com.acme;
+
+public class GpsSensor {
+
+    public GpsSensor() {
+    }
+
+    public void calibrate() {
+    }
+}

part-2/src/main/java/com/example/Application.java

@@ -0,0 +1,27 @@
+package com.example;
+import javax.inject.*;
+import dagger.*;
+import com.acme.*;
+
+@Component(modules = {YahooWeatherModule.class, GpsSensorModule.class})
+interface AppComponent {
+    WeatherReporter getWeatherReporter();
+}
+
+public class Application {
+    public static void main(String args[]) {
+        if(args.length < 1) {
+            System.out.println("You must provide an API key\n");
+            return;
+        }
+
+        String apiKey = args[0];
+        YahooWeatherModule yahoo = new YahooWeatherModule(apiKey);
+
+        AppComponent component = DaggerAppComponent.builder()
+               .yahooWeatherModule(yahoo)
+               .build();
+        WeatherReporter reporter = component.getWeatherReporter();
+        reporter.report();
+    }
+}

part-2/src/main/java/com/example/GpsSensorModule.java

@@ -0,0 +1,13 @@
+package com.example;
+import com.acme.*;
+import dagger.*;
+
+@Module
+public class GpsSensorModule {
+    @Provides
+    GpsSensor provideGpsSensor() {
+        GpsSensor gps = new GpsSensor();
+        gps.calibrate();
+        return gps;
+    }
+}

part-2/src/main/java/com/example/LocationManager.java

@@ -0,0 +1,13 @@
+package com.example;
+import javax.inject.*;
+import com.acme.*;
+
+public class LocationManager {
+
+    private final GpsSensor gps;
+
+    @Inject
+    public LocationManager(GpsSensor gps) {
+        this.gps = gps;
+    }
+}

part-2/src/main/java/com/example/WeatherChannel.java

@@ -0,0 +1,8 @@
+package com.example;
+import javax.inject.*;
+
+public class WeatherChannel implements WeatherService {
+    @Inject
+    public WeatherChannel() {
+    }
+}

part-2/src/main/java/com/example/WeatherChannelModule.java

@@ -0,0 +1,10 @@
+package com.example;
+import dagger.*;
+
+@Module
+public class WeatherChannelModule {
+    @Provides
+    WeatherService provideWeatherService() {
+        return new WeatherChannel();
+    }
+}

part-2/src/main/java/com/example/WeatherReporter.java

@@ -0,0 +1,22 @@
+package com.example;
+import javax.inject.*;
+
+public class WeatherReporter {
+
+    private final WeatherService weatherService;
+
+    private final LocationManager locationManager;
+
+    @Inject
+    public WeatherReporter(WeatherService weatherService,
+                           LocationManager locationManager) {
+        this.locationManager = locationManager;
+        this.weatherService = weatherService;
+    }
+
+    public void report() {
+        // locationManager.getCurrentLocation()
+        // weatherService.getConditionsAt(currentLocation)
+        System.out.println("Mostly clouded, 26 C\n");
+    }
+}

part-2/src/main/java/com/example/WeatherService.java

@@ -0,0 +1,4 @@
+package com.example;
+
+public interface WeatherService {
+}

part-2/src/main/java/com/example/WebSocket.java

@@ -0,0 +1,8 @@
+package com.example;
+import javax.inject.*;
+
+public class WebSocket {
+    @Inject
+    public WebSocket() {
+    }
+}

part-2/src/main/java/com/example/YahooWeather.java

@@ -0,0 +1,14 @@
+package com.example;
+import javax.inject.*;
+
+public class YahooWeather implements WeatherService {
+
+    private final WebSocket socket;
+
+    private final String key;
+
+    public YahooWeather(String key, WebSocket socket) {
+        this.key = key;
+        this.socket = socket;
+    }
+}

part-2/src/main/java/com/example/YahooWeatherModule.java

@@ -0,0 +1,18 @@
+package com.example;
+import dagger.*;
+
+@Module
+public class YahooWeatherModule {
+
+    private final String key;
+
+    public YahooWeatherModule(String key) {
+        this.key = key;
+    }
+
+    @Provides
+    WeatherService provideWeatherService(WebSocket socket) {
+        return new YahooWeather(key, socket);
+    }
+}
+