added facade sample

facade/pom.xml

@@ -0,0 +1,23 @@
+<?xml version="1.0"?>
+<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
+  <modelVersion>4.0.0</modelVersion>
+  <parent>
+    <groupId>com.iluwatar</groupId>
+    <artifactId>java-design-patterns</artifactId>
+    <version>1.0-SNAPSHOT</version>
+  </parent>
+  <groupId>com.iluwatar</groupId>
+  <artifactId>facade</artifactId>
+  <version>1.0-SNAPSHOT</version>
+  <name>facade</name>
+  <url>http://maven.apache.org</url>
+  <dependencies>
+    <dependency>
+      <groupId>junit</groupId>
+      <artifactId>junit</artifactId>
+      <version>3.8.1</version>
+      <scope>test</scope>
+    </dependency>
+  </dependencies>
+</project>

facade/src/main/java/com/iluwatar/App.java

@@ -0,0 +1,12 @@
+package com.iluwatar;
+
+public class App 
+{
+    public static void main( String[] args )
+    {
+    	DwarvenGoldmineFacade facade = new DwarvenGoldmineFacade();
+    	facade.startNewDay();
+    	facade.digOutGold();
+    	facade.endDay();
+    }
+}

facade/src/main/java/com/iluwatar/DwarvenCartOperator.java

@@ -0,0 +1,15 @@
+package com.iluwatar;
+
+public class DwarvenCartOperator extends DwarvenMineWorker {
+
+	@Override
+	public void work() {
+		System.out.println(name() + " moves gold chunks out of the mine.");
+	}
+
+	@Override
+	public String name() {
+		return "Dwarf cart operator";
+	}
+
+}

facade/src/main/java/com/iluwatar/DwarvenGoldDigger.java

@@ -0,0 +1,15 @@
+package com.iluwatar;
+
+public class DwarvenGoldDigger extends DwarvenMineWorker {
+
+	@Override
+	public void work() {
+		System.out.println(name() + " digs for gold.");
+	}
+
+	@Override
+	public String name() {
+		return "Dwarf gold digger";
+	}
+
+}

facade/src/main/java/com/iluwatar/DwarvenGoldmineFacade.java

@@ -0,0 +1,37 @@
+package com.iluwatar;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class DwarvenGoldmineFacade {
+
+	List<DwarvenMineWorker> workers;
+	
+	public DwarvenGoldmineFacade() {
+		workers = new ArrayList<>();
+		workers.add(new DwarvenGoldDigger());
+		workers.add(new DwarvenCartOperator());
+		workers.add(new DwarvenTunnelDigger());
+	}
+	
+	public void startNewDay() {
+		for (DwarvenMineWorker worker: workers) {
+			worker.wakeUp();
+			worker.goToMine();
+		}
+	}
+	
+	public void digOutGold() {
+		for (DwarvenMineWorker worker: workers) {
+			worker.work();
+		}
+	}
+	
+	public void endDay() {
+		for (DwarvenMineWorker worker: workers) {
+			worker.goHome();
+			worker.goToSleep();
+		}
+	}
+	
+}

facade/src/main/java/com/iluwatar/DwarvenMineWorker.java

@@ -0,0 +1,25 @@
+package com.iluwatar;
+
+public abstract class DwarvenMineWorker {
+
+	public void goToSleep() {
+		System.out.println(name() + " goes to sleep.");
+	}
+	
+	public void wakeUp() {
+		System.out.println(name() + " wakes up.");
+	}
+	
+	public void goHome() {
+		System.out.println(name() + " goes home.");
+	}
+	
+	public void goToMine() {
+		System.out.println(name() + " goes to the mine.");
+	}
+	
+	public abstract void work();
+	
+	public abstract String name();
+	
+}

facade/src/main/java/com/iluwatar/DwarvenTunnelDigger.java

@@ -0,0 +1,15 @@
+package com.iluwatar;
+
+public class DwarvenTunnelDigger extends DwarvenMineWorker {
+
+	@Override
+	public void work() {
+		System.out.println(name() + " creates another promising tunnel.");
+	}
+
+	@Override
+	public String name() {
+		return "Dwarven tunnel digger";
+	}
+
+}

pom.xml

@@ -27,5 +27,22 @@
     <module>bridge</module>
     <module>composite</module>
     <module>decorator</module>
+    <module>facade</module>
   </modules>
-</project>
+  
+<build>
+	<plugins>
+		<!-- Tell maven to compile using Java 1.7 -->
+		<plugin>
+			<groupId>org.apache.maven.plugins</groupId>
+			<artifactId>maven-compiler-plugin</artifactId>
+			<version>3.0</version>
+			<configuration>
+				<source>1.7</source>
+				<target>1.7</target>
+			</configuration>
+		</plugin>
+	</plugins>
+</build>
+  
+</project>