adapter added

Author: maciej-nowak

adapter/README.md

@@ -0,0 +1,3 @@
+# Adapter
+
+This is repository of http://androidcode.pl blog. It shows uses of Adapter in Android. It is a part of Design Patterns - Adapter post in the blog.

adapter/example/Analytics.java

@@ -0,0 +1,8 @@
+public class Analytics {
+
+	public static void sendReport(String text) {
+		//implementation
+	}
+
+	//other methods
+}

adapter/example/ExternalMessageProtocol.java

@@ -0,0 +1,16 @@
+public class ExternalMessageProtocol {
+
+	public void sendString(String text) {
+		//implementation
+	}
+
+	public void sendBytes(byte[] bytes) {
+		//implementation
+	}
+
+	public byte[] getBytes(File file) {
+		return Files.readAllBytes(file.toPath());
+	}
+
+	//other methods
+}

adapter/example/IMessageProtocol.java

@@ -0,0 +1,5 @@
+public interface IMessageProtocol {
+
+    void sendText(String text);
+    void sendFile(File file);
+}

adapter/example/Main.java

@@ -0,0 +1,10 @@
+public class Main {
+
+	public static void main() {
+		Messenger newMessenger = new Messenger(new MessageProtocolAdapter());
+		newMessenger.sendMessage("Message from external library"); //send optimized message and analytics
+
+		Messenger oldMessenger = new Messenger(new MessageProtocol());
+		oldMessenger.sendMessage("Message from internal library"); //send only message
+	}
+}

adapter/example/MessageProtocol.java

@@ -0,0 +1,12 @@
+public class MessageProtocol implements IMessageProtocol {
+
+    @Override
+    public void sendText(String text) {
+        //converting and sending text
+    }
+
+    @Override
+    public void sendFile(File file) {
+        //converting and sending file
+    }
+}

adapter/example/MessageProtocolAdapter.java

@@ -0,0 +1,20 @@
+public class MessageProtocolAdapter implements IMessageProtocol {
+
+    private ExternalMessageProtocol protocol = new ExternalMessageProtocol();
+
+    public MessageProtocolAdapter() {
+        this.protocol = new ExternalMessageProtocol();
+    }
+
+    @Override
+    public void sendText(String text) {
+        Analytics.report("Message");
+        protocol.sendString(text);
+    }
+
+    @Override
+    public void sendFile(File file) {
+        Analytics.report("File");
+        protocol.sendBytes(protocol.getBytes(file));
+    }
+}

adapter/example/Messenger.java

@@ -0,0 +1,20 @@
+public class Messenger {
+
+    private IMessageProtocol protocol;
+
+    public Messenger(IMessageProtocol protocol) {
+        this.protocol = protocol;
+    }
+
+    public void sendMessage(String text) {
+        protocol.sendText(text);
+    }
+
+    public void sendMessage(File file) {
+        protocol.sendFile(file);
+    }
+
+    public void changeStatus(String text) {
+        //set and show status
+    }
+}

adapter/pattern/Adaptee.java

@@ -0,0 +1,14 @@
+public class Adaptee {
+
+    public void method1() {
+        //some work
+    }
+
+    public void method2() {
+        //some work 
+    }
+
+    public void method3() {
+        //some work 
+    }
+}

adapter/pattern/AdapterClass.java

@@ -0,0 +1,12 @@
+public class AdapterClass extends Adaptee implements Client {
+
+    @Override
+    public void operation1() {
+        method1();
+    }
+
+    @Override
+    public void operation2() {
+        method2();
+    }
+}

adapter/pattern/AdapterObject.java

@@ -0,0 +1,19 @@
+public class AdapterObject implements Client {
+  
+    private Adaptee adaptee;
+
+    public Client() {
+        this.adaptee = new Adaptee();
+        //some parameters can be passed to initialize Adaptee
+    }
+
+    @Override
+    public void operation1() {
+        adaptee.method1();
+    }
+
+    @Override
+    public void operation2() {
+        adaptee.method2();
+    }
+}

adapter/pattern/Client.java

@@ -0,0 +1,5 @@
+public interface Client {
+  
+    void operation1();
+    void operation2();
+}

adapter/pattern/Main.java

@@ -0,0 +1,10 @@
+public class Main {
+
+	public static void main() {
+		Client clientClass = new AdapterClass();
+		clientClass.operation1(); //runs method1() from Adaptee
+
+		Client clientObject = new AdapterObject();
+		clientObject.operation2(); //runs method2() from Adaptee
+	}
+}