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siderissideris
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Adding Servant Design pattern classes
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6 files changed

+180
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‎servant/pom.xml‎

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<?xml version="1.0"?>
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<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"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
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<modelVersion>4.0.0</modelVersion>
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<parent>
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<groupId>com.iluwatar</groupId>
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<artifactId>java-design-patterns</artifactId>
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<version>1.0-SNAPSHOT</version>
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</parent>
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<groupId>com.iluwatar</groupId>
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<artifactId>servant</artifactId>
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<version>1.0-SNAPSHOT</version>
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<name>servant</name>
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<url>http://maven.apache.org</url>
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<dependencies>
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<dependency>
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<groupId>junit</groupId>
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<artifactId>junit</artifactId>
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<version>3.8.1</version>
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<scope>test</scope>
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</dependency>
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</dependencies>
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</project>

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

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

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

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

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

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

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

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

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

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

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