Java Design patterns

Java Design Patterns/javadevjournal/design/structural/adapter/AdapterPatternDemo.java

@@ -0,0 +1,14 @@
+package javadevjournal.design.structural.adapter;
+
+/**
+ * @author Kunwar
+ */
+public class AdapterPatternDemo {
+   public static void main(String[] args) {
+      AudioPlayer audioPlayer = new AudioPlayer();
+      audioPlayer.playMusic("mp3", "song1.mp3");
+      audioPlayer.playMusic("mp4", "song2.mp4");
+      audioPlayer.playMusic("vlc", "song3.vlc");
+      audioPlayer.playMusic("xyz", "song4.avi");
+   }
+}

Java Design Patterns/javadevjournal/design/structural/adapter/AdvancedMediaPlayer.java

@@ -0,0 +1,9 @@
+package javadevjournal.design.structural.adapter;
+
+/**
+ * @author Kunwar
+ */
+public interface AdvancedMediaPlayer {
+   void playVlcPlayer(String fileName);
+   void playMp4Player(String fileName);
+}

Java Design Patterns/javadevjournal/design/structural/adapter/AudioPlayer.java

@@ -0,0 +1,22 @@
+package javadevjournal.design.structural.adapter;
+
+/**
+ * @author Kunwar
+ */
+public class AudioPlayer implements MediaPlayer {
+   private MediaAdapter mediaAdapter;
+   @Override
+   public void playMusic(String audioType, String fileName) {
+      //the mp3 format is supported by AudioPlayer itself and it doesn't need adapter here.
+      if(audioType.equalsIgnoreCase("mp3")){
+         System.out.println("Playing mp3 file: " + fileName);
+      }
+      //to support other formats, we will need the MediaAdapter
+      else if(audioType.equalsIgnoreCase("vlc") || audioType.equalsIgnoreCase("mp4")){
+         mediaAdapter = new MediaAdapter(audioType);
+         mediaAdapter.playMusic(audioType, fileName);
+      }else{
+         System.out.println("The given format: " + audioType + " is not supported");
+      }
+   }   
+}

Java Design Patterns/javadevjournal/design/structural/adapter/MediaAdapter.java

@@ -0,0 +1,28 @@
+package javadevjournal.design.structural.adapter;
+
+/**
+ * @author Kunwar
+ */
+public class MediaAdapter implements MediaPlayer {
+
+   public static final String VLC = "vlc";
+   public static final String MP_4 = "mp4";
+
+   private AdvancedMediaPlayer advancedMusicPlayer;
+   public MediaAdapter(String audioType){
+      if(audioType.equalsIgnoreCase(VLC) ){
+         advancedMusicPlayer = new VlcMusicPlayer();
+      }else if (audioType.equalsIgnoreCase(MP_4)){
+         advancedMusicPlayer = new Mp4MusicPlayer();
+      }	
+   }
+
+   @Override
+   public void playMusic(String audioType, String fileName) {
+      if(audioType.equalsIgnoreCase(VLC)){
+         advancedMusicPlayer.playVlcPlayer(fileName);
+      }else if(audioType.equalsIgnoreCase(MP_4)){
+         advancedMusicPlayer.playMp4Player(fileName);
+      }
+   }
+}

Java Design Patterns/javadevjournal/design/structural/adapter/MediaPlayer.java

@@ -0,0 +1,8 @@
+package javadevjournal.design.structural.adapter;
+
+/**
+ * @author Kunwar
+ */
+public interface MediaPlayer{
+   void playMusic(String audioType, String fileName);
+}

Java Design Patterns/javadevjournal/design/structural/adapter/Mp4MusicPlayer.java

@@ -0,0 +1,17 @@
+package javadevjournal.design.structural.adapter;
+
+/**
+ * @author Kunwar
+ */
+public class Mp4MusicPlayer implements AdvancedMediaPlayer{
+
+   @Override
+   public void playVlcPlayer(String fileName) {
+      //do nothing
+   }
+
+   @Override
+   public void playMp4Player(String fileName) {
+      System.out.println("Playing mp4 file: "+ fileName);
+   }
+}

Java Design Patterns/javadevjournal/design/structural/adapter/VlcMusicPlayer.java

@@ -0,0 +1,16 @@
+package javadevjournal.design.structural.adapter;
+
+/**
+ * @author Kunwar
+ */
+public class VlcMusicPlayer implements AdvancedMediaPlayer{
+   @Override
+   public void playVlcPlayer(String fileName){
+      System.out.println("Playing vlc file: "+ fileName);
+   }
+
+   @Override
+   public void playMp4Player(String fileName) {
+      //do nothing
+   }
+}