[Proxy] Added images examples and atm machine example

src/proxy/examples/atm/ATMClient.java

@@ -0,0 +1,17 @@
+package proxy.examples.atm;
+
+/**
+ * Created by luisburgos on 21/09/15.
+ */
+public class ATMClient {
+
+    public static void main(String[] args) {
+
+        GetATMData realAtmMachine = new ATMMachine(1000);
+        GetATMData atmProxy = new ATMProxy(realAtmMachine);
+
+        System.out.println("ATM Machine, cash available: " + atmProxy.getCashInMachine());
+
+
+    }
+}

src/proxy/examples/atm/ATMMachine.java

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+package proxy.examples.atm;
+
+/**
+ * Created by luisburgos on 21/09/15.
+ */
+public class ATMMachine implements GetATMData {
+
+    private int cashInMachine;
+
+    public ATMMachine(int cashInMachine){
+        this.cashInMachine = cashInMachine;
+    }
+    @Override
+    public int getCashInMachine() {
+        return cashInMachine;
+    }
+}

src/proxy/examples/atm/ATMProxy.java

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+package proxy.examples.atm;
+
+/**
+ * Created by luisburgos on 21/09/15.
+ */
+public class ATMProxy implements GetATMData {
+
+    private GetATMData atmMachine;
+
+    public ATMProxy(GetATMData atmMachine){
+        this.atmMachine = atmMachine;
+    }
+
+    @Override
+    public int getCashInMachine() {
+        return atmMachine.getCashInMachine();
+    }
+}

src/proxy/examples/atm/GetATMData.java

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+package proxy.examples.atm;
+
+/**
+ * Created by luisburgos on 21/09/15.
+ */
+public interface GetATMData {
+    public int getCashInMachine();
+}

src/proxy/examples/images/ClientImage.java

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+package proxy.examples.images;
+
+/**
+ * Created by luisburgos on 21/09/15.
+ */
+public class ClientImage  {
+
+    public static void main(String[] args) {
+
+        Image image = new ProxyImage("img_10.jpg");
+
+        //image will be loaded from disk
+        image.display();
+        System.out.println("");
+
+        //image will NOT be loaded from disk
+        image.display();
+    }
+
+}

src/proxy/examples/images/Image.java

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+package proxy.examples.images;
+
+/**
+ * Created by luisburgos on 21/09/15.
+ */
+public interface Image {
+    public void display();
+}

src/proxy/examples/images/ProxyImage.java

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+package proxy.examples.images;
+
+/**
+ * Created by luisburgos on 21/09/15.
+ */
+public class ProxyImage implements Image {
+
+    private RealImage realImage;
+    private String imageFileName;
+
+    public ProxyImage(String fileName){
+        this.imageFileName = fileName;
+    }
+
+    @Override
+    public void display() {
+        if(realImage == null){
+            realImage = new RealImage(imageFileName);
+        }
+        realImage.display();
+    }
+
+}

src/proxy/examples/images/RealImage.java

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+package proxy.examples.images;
+
+/**
+ * Created by luisburgos on 21/09/15.
+ */
+public class RealImage implements Image {
+
+    private String imageFileName;
+
+    public RealImage(String imageFileName){
+        this.imageFileName = imageFileName;
+        loadFromDisk(imageFileName);
+    }
+
+    @Override
+    public void display() {
+        System.out.println("Displaying " + imageFileName);
+    }
+
+    private void loadFromDisk(String imageFileName){
+        System.out.println("Loading " + imageFileName);
+    }
+
+}