Adding Servant Design pattern classes

servant/pom.xml

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+<?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>servant</artifactId>
+  <version>1.0-SNAPSHOT</version>
+  <name>servant</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>

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

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+package com.iluwatar;
+
+import java.util.ArrayList;
+
+
+/**
+ * Servant offers some functionality to a group of classes without defining that functionality in each of them. 
+ * A Servant is a class whose instance provides methods that take care of a desired service,
+ * while objects for which the servant does something, are taken as parameters.
+ *
+ */
+public class App {
+	static Servant jenkins = new Servant("Jenkins");
+	static Servant travis = new Servant("Travis");
+	
+	public static void main( String[] args ){
+		scenario(jenkins, 1);
+		scenario(travis, 0);
+	}
+	
+	
+	public static void scenario(Servant servant, int compliment){
+		King k = new King();
+		Queen q = new Queen();
+		
+		ArrayList<Royalty> guests = new ArrayList<>();
+		guests.add(k);
+		guests.add(q);
+		
+		//feed
+		servant.feed(k);
+		servant.feed(q);
+		//serve drinks
+		servant.giveWine(k);
+		servant.giveWine(q);
+		//compliment
+		servant.GiveCompliments( guests.get(compliment) );
+		
+		//outcome of the night
+		for(Royalty r : guests)
+			r.changeMood();
+		
+		//check your luck
+		if( servant.checkIfYouWillBeHanged(guests) )
+			System.out.println(servant.name + " will live another day");
+		else
+			System.out.println("Poor " + servant.name + ". His days are numbered");
+	}
+	
+	
+}

servant/src/main/java/com/iluwatar/King.java

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+package com.iluwatar;
+
+public class King implements Royalty{
+	private boolean isDrunk = false, isHungry = true, isHappy = false;
+	private boolean complimentReceived = false;
+	
+	@Override
+	public void feed() {
+		isHungry = false;
+	}
+
+	@Override
+	public void giveDrink() {
+		isDrunk = true;
+	}
+	
+	public void receiveCompliments(){
+		complimentReceived = true;
+	}
+
+	@Override
+	public void changeMood() {
+		if(!isHungry && isDrunk) isHappy = true;
+		if( complimentReceived ) isHappy = false;
+	}
+
+	@Override
+	public boolean getMood() {
+		return isHappy;
+	}
+}

servant/src/main/java/com/iluwatar/Queen.java

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+package com.iluwatar;
+
+public class Queen implements Royalty{
+	private boolean isDrunk = true, isHungry = false, isHappy = false;
+	private boolean isFlirty = true, complimentReceived = false;
+	
+	@Override
+	public void feed() {
+		isHungry = false;
+	}
+
+	@Override
+	public void giveDrink() {
+		isDrunk = true;
+	}
+	
+	public void receiveCompliments(){
+		complimentReceived = true;
+	}
+
+	@Override
+	public void changeMood() {
+		if( complimentReceived && isFlirty && isDrunk ) isHappy = true;
+	}
+
+	@Override
+	public boolean getMood() {
+		return isHappy;
+	}
+	
+	public void setFlirtiness(boolean f){
+		this.isFlirty = f;
+	}
+
+}

servant/src/main/java/com/iluwatar/Royalty.java

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+package com.iluwatar;
+
+interface Royalty {
+	public void feed();
+	public void giveDrink();
+	public void changeMood();
+	public void receiveCompliments();
+	public boolean getMood();
+}

servant/src/main/java/com/iluwatar/Servant.java

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+package com.iluwatar;
+
+import java.util.ArrayList;
+
+public class Servant {
+	public String name;
+	
+	public Servant(String name){
+		this.name = name;
+	}
+
+	public void feed(Royalty r){
+		r.feed();
+	}
+	
+	public void giveWine(Royalty r){
+		r.giveDrink();
+	}
+	
+	public void GiveCompliments(Royalty r){
+		r.receiveCompliments();
+	}
+	
+	public boolean checkIfYouWillBeHanged(ArrayList<Royalty> tableGuests){
+		boolean anotherDay = true;
+		for( Royalty r : tableGuests )
+			if( !r.getMood() ) anotherDay = false;
+			
+		return anotherDay;
+	}
+}