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added mediator sample
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12 files changed

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12 files changed

+217
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‎mediator/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>mediator</artifactId>
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<version>1.0-SNAPSHOT</version>
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<name>mediator</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>

‎mediator/src/main/java/com/iluwatar/Action.java‎

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package com.iluwatar;
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public enum Action {
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HUNT, TALE, GOLD, ENEMY;
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public String toString() {
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String s = "";
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switch (this) {
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case ENEMY:
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s = "spotted enemies";
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break;
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case GOLD:
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s = "found gold";
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break;
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case HUNT:
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s = "hunted a rabbit";
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break;
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case TALE:
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s = "tells a tale";
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break;
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default:
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break;
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}
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return s;
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};
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}

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

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package com.iluwatar;
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public class App
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{
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public static void main( String[] args )
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{
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Party party = new PartyImpl();
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Hobbit hobbit = new Hobbit();
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Wizard wizard = new Wizard();
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Rogue rogue = new Rogue();
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Hunter hunter = new Hunter();
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party.addMember(hobbit);
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party.addMember(wizard);
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party.addMember(rogue);
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party.addMember(hunter);
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hobbit.act(Action.ENEMY);
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wizard.act(Action.TALE);
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rogue.act(Action.GOLD);
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hunter.act(Action.HUNT);
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}
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}

‎mediator/src/main/java/com/iluwatar/Hobbit.java‎

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package com.iluwatar;
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public class Hobbit extends PartyMemberBase {
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@Override
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public String toString() {
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return "Hobbit";
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}
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}

‎mediator/src/main/java/com/iluwatar/Hunter.java‎

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package com.iluwatar;
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public class Hunter extends PartyMemberBase {
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@Override
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public String toString() {
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return "Hunter";
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}
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}

‎mediator/src/main/java/com/iluwatar/Party.java‎

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package com.iluwatar;
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public interface Party {
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void addMember(PartyMember member);
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void act(PartyMember actor, Action action);
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}

‎mediator/src/main/java/com/iluwatar/PartyImpl.java‎

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package com.iluwatar;
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import java.util.ArrayList;
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import java.util.List;
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public class PartyImpl implements Party {
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private List<PartyMember> members;
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public PartyImpl() {
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members = new ArrayList<>();
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}
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@Override
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public void act(PartyMember actor, Action action) {
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for (PartyMember member: members) {
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if (member != actor) {
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member.partyAction(action);
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}
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}
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}
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@Override
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public void addMember(PartyMember member) {
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members.add(member);
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member.joinedParty(this);
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}
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// somebody hunts for food, call for dinner
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// somebody spots enemy, alert everybody
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// somebody finds gold, deal the gold with everybody
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// somebody tells a tale, call everybody to listen
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}

‎mediator/src/main/java/com/iluwatar/PartyMember.java‎

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package com.iluwatar;
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public interface PartyMember {
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void joinedParty(Party party);
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void partyAction(Action action);
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void act(Action action);
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}

‎mediator/src/main/java/com/iluwatar/PartyMemberBase.java‎

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package com.iluwatar;
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public abstract class PartyMemberBase implements PartyMember {
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protected Party party;
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@Override
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public void joinedParty(Party party) {
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System.out.println(this + " joins the party");
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this.party = party;
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}
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@Override
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public void partyAction(Action action) {
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String s = this + " ";
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switch (action) {
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case ENEMY:
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s = s + "runs for cover";
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break;
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case GOLD:
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s = s + "takes his share of the gold";
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break;
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case HUNT:
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s = s + "arrives for dinner";
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break;
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case TALE:
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s = s + "comes to listen";
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break;
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default:
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break;
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}
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System.out.println(s);
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}
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@Override
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public void act(Action action) {
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if (party != null) {
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System.out.println(this + " " + action.toString());
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party.act(this, action);
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}
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}
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@Override
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public abstract String toString();
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}

‎mediator/src/main/java/com/iluwatar/Rogue.java‎

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package com.iluwatar;
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public class Rogue extends PartyMemberBase {
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@Override
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public String toString() {
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return "Rogue";
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}
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}

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