composite

Author: code4craft

pom.xml

@@ -20,7 +20,12 @@
             <artifactId>hamcrest-all</artifactId>
             <version>1.3</version>
         </dependency>
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-lang3</artifactId>
+            <version>3.1</version>
+        </dependency>
     </dependencies>
 
-    
+
 </project>

src/main/java/helloworld/Main.java

@@ -8,6 +8,9 @@
 import helloworld.creational.singleton.HelloWorldSingleton;
 import helloworld.structural.adapter.HelloAdapterDesignPattern;
 import helloworld.structural.adapter.HelloWorldAdapter;
+import helloworld.structural.bridge.DesignPatternWorldImpl;
+import helloworld.structural.bridge.HelloWorldBridge;
+import helloworld.structural.composite.CompositeHelloWorld;
 
 /**
  * @author yihua.huang@dianping.com
@@ -44,5 +47,10 @@ public static void main(String[] args) throws InstantiationException, IllegalAcc
         HelloWorld adapterHelloWorld = new HelloWorldAdapter(new HelloAdapterDesignPattern());
         System.out.println(adapterHelloWorld.helloWorld());
 
+        HelloWorld bridgeHelloWorld = new HelloWorldBridge(new DesignPatternWorldImpl());
+
+        HelloWorld compositeHelloWorld = new CompositeHelloWorld(bridgeHelloWorld, new CompositeHelloWorld.DefaultHelloWorld());
+        System.out.println(compositeHelloWorld.helloWorld());
+
     }
 }

src/main/java/helloworld/structural/adapter/HelloAdapterDesignPattern.java

@@ -3,7 +3,7 @@
 /**
  * @author yihua.huang@dianping.com
  */
-public class HelloAdapterDesignPattern implements HelloDesignPattern{
+public class HelloAdapterDesignPattern {
 
     public String helloDesignPattern(){
         return "Hello Adapter!";

src/main/java/helloworld/structural/adapter/HelloDesignPattern.java

@@ -7,9 +7,9 @@
  */
 public class HelloWorldAdapter implements HelloWorld{
 
-    private HelloDesignPattern helloDesignPattern;
+    private HelloAdapterDesignPattern helloDesignPattern;
 
-    public HelloWorldAdapter(HelloDesignPattern helloDesignPattern) {
+    public HelloWorldAdapter(HelloAdapterDesignPattern helloDesignPattern) {
         this.helloDesignPattern = helloDesignPattern;
     }
 

src/main/java/helloworld/structural/adapter/HelloWorldAdapter.java

@@ -0,0 +1,11 @@
+package helloworld.structural.bridge;
+
+/**
+ * @author yihua.huang@dianping.com
+ */
+public class DesignPatternWorldImpl implements HelloWorldImpl {
+    @Override
+    public String generate() {
+        return "Hello Bridge!";
+    }
+}

src/main/java/helloworld/structural/bridge/DesignPatternWorldImpl.java

@@ -0,0 +1,20 @@
+package helloworld.structural.bridge;
+
+import helloworld.HelloWorld;
+
+/**
+ * @author yihua.huang@dianping.com
+ */
+public class HelloWorldBridge implements HelloWorld{
+
+    private HelloWorldImpl helloWorldImpl;
+
+    public HelloWorldBridge(HelloWorldImpl helloWorldImpl) {
+        this.helloWorldImpl = helloWorldImpl;
+    }
+
+    @Override
+    public String helloWorld() {
+        return helloWorldImpl.generate();
+    }
+}

src/main/java/helloworld/structural/bridge/HelloWorldBridge.java

@@ -0,0 +1,10 @@
+package helloworld.structural.bridge;
+
+/**
+ * Real logic of hello world!
+ * @author yihua.huang@dianping.com
+ */
+public interface HelloWorldImpl {
+
+    public String generate();
+}

src/main/java/helloworld/structural/bridge/HelloWorldImpl.java

@@ -0,0 +1,11 @@
+package helloworld.structural.bridge;
+
+/**
+ * @author yihua.huang@dianping.com
+ */
+public class JavaHelloWorldImpl implements HelloWorldImpl {
+    @Override
+    public String generate() {
+        return "Hello Java!";
+    }
+}

src/main/java/helloworld/structural/bridge/JavaHelloWorldImpl.java

@@ -0,0 +1,39 @@
+package helloworld.structural.composite;
+
+import helloworld.HelloWorld;
+import org.apache.commons.lang3.StringUtils;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+/**
+ * @author yihua.huang@dianping.com
+ */
+public class CompositeHelloWorld implements HelloWorld {
+
+    private List<HelloWorld> helloWorlds;
+
+    private String lineSeparetor = System.getProperty("line.separator");
+
+    public CompositeHelloWorld(HelloWorld... helloWorlds) {
+        this.helloWorlds = Arrays.asList(helloWorlds);
+    }
+
+    @Override
+    public String helloWorld() {
+        List<String> helloWorldOuts = new ArrayList<String>();
+        for (HelloWorld helloWorld : helloWorlds) {
+            helloWorldOuts.add(helloWorld.helloWorld());
+        }
+        return StringUtils.join(helloWorldOuts, lineSeparetor);
+    }
+
+    public static class DefaultHelloWorld implements HelloWorld{
+
+        @Override
+        public String helloWorld() {
+            return "Hello Composite!";
+        }
+    }
+}

src/main/java/helloworld/structural/composite/CompositeHelloWorld.java

@@ -0,0 +1,22 @@
+package helloworld.structural.bridge;
+
+import helloworld.HelloWorld;
+import helloworld.structural.adapter.HelloAdapterDesignPattern;
+import org.junit.Test;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.is;
+
+/**
+ * @author yihua.huang@dianping.com
+ */
+public class HelloWorldBridgeTest {
+
+    @Test
+    public void testHelloWorldAdapter(){
+        HelloWorld bridgeHelloWorld = new HelloWorldBridge(new JavaHelloWorldImpl());
+        assertThat(bridgeHelloWorld.helloWorld(),is("Hello Java!"));
+        bridgeHelloWorld = new HelloWorldBridge(new DesignPatternWorldImpl());
+        assertThat(bridgeHelloWorld.helloWorld(),is("Hello Bridge!"));
+    }
+}

src/test/java/helloworld/structural/bridge/HelloWorldBridgeTest.java

@@ -0,0 +1,25 @@
+package helloworld.structural.composite;
+
+import helloworld.HelloWorld;
+import helloworld.structural.bridge.DesignPatternWorldImpl;
+import helloworld.structural.bridge.HelloWorldBridge;
+import helloworld.structural.bridge.JavaHelloWorldImpl;
+import org.junit.Test;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.is;
+import static org.hamcrest.Matchers.isEmptyString;
+
+/**
+ * @author yihua.huang@dianping.com
+ */
+public class CompositeHelloWorldTest {
+
+    @Test
+    public void testCompositeHelloWorld(){
+        HelloWorld emptyCompositeHelloWorld = new CompositeHelloWorld();
+        assertThat(emptyCompositeHelloWorld.helloWorld(),isEmptyString());
+        HelloWorld compositeHelloWorld = new CompositeHelloWorld(new CompositeHelloWorld.DefaultHelloWorld());
+        assertThat(compositeHelloWorld.helloWorld(),is("Hello Composite!"));
+    }
+}