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iluwatariluwatar
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added visitor pattern sample
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11 files changed

+188
-0
lines changed

11 files changed

+188
-0
lines changed

‎pom.xml‎

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<module>state</module>
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<module>strategy</module>
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<module>template-method</module>
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<module>visitor</module>
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</modules>
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<build>

‎visitor/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>visitor</artifactId>
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<version>1.0-SNAPSHOT</version>
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<name>visitor</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>

‎visitor/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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Commander commander = new Commander(
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new Sergeant(new Soldier(), new Soldier(), new Soldier()),
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new Sergeant(new Soldier(), new Soldier(), new Soldier()));
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commander.accept(new SoldierVisitor());
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commander.accept(new SergeantVisitor());
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commander.accept(new CommanderVisitor());
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}
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}

‎visitor/src/main/java/com/iluwatar/Commander.java‎

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package com.iluwatar;
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public class Commander extends Unit {
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public Commander(Unit ... children) {
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super(children);
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}
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@Override
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public void accept(UnitVisitor visitor) {
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visitor.visitCommander(this);
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super.accept(visitor);
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}
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@Override
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public String toString() {
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return "commander";
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}
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}

‎visitor/src/main/java/com/iluwatar/CommanderVisitor.java‎

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package com.iluwatar;
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public class CommanderVisitor implements UnitVisitor {
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@Override
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public void visitSoldier(Soldier soldier) {
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// TODO Auto-generated method stub
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}
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@Override
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public void visitSergeant(Sergeant sergeant) {
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// TODO Auto-generated method stub
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}
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@Override
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public void visitCommander(Commander commander) {
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System.out.println("Good to see you " + commander);
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}
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}

‎visitor/src/main/java/com/iluwatar/Sergeant.java‎

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package com.iluwatar;
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public class Sergeant extends Unit {
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public Sergeant(Unit ... children) {
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super(children);
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}
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@Override
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public void accept(UnitVisitor visitor) {
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visitor.visitSergeant(this);
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super.accept(visitor);
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}
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@Override
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public String toString() {
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return "sergeant";
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}
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}

‎visitor/src/main/java/com/iluwatar/SergeantVisitor.java‎

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package com.iluwatar;
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public class SergeantVisitor implements UnitVisitor {
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@Override
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public void visitSoldier(Soldier soldier) {
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// TODO Auto-generated method stub
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}
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@Override
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public void visitSergeant(Sergeant sergeant) {
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System.out.println("Hello " + sergeant);
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}
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@Override
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public void visitCommander(Commander commander) {
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// TODO Auto-generated method stub
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}
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}

‎visitor/src/main/java/com/iluwatar/Soldier.java‎

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package com.iluwatar;
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public class Soldier extends Unit {
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public Soldier(Unit ... children) {
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super(children);
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}
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@Override
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public void accept(UnitVisitor visitor) {
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visitor.visitSoldier(this);
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super.accept(visitor);
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}
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@Override
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public String toString() {
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return "soldier";
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}
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}

‎visitor/src/main/java/com/iluwatar/SoldierVisitor.java‎

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package com.iluwatar;
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public class SoldierVisitor implements UnitVisitor {
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@Override
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public void visitSoldier(Soldier soldier) {
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System.out.println("Greetings " + soldier);
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}
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@Override
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public void visitSergeant(Sergeant sergeant) {
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// TODO Auto-generated method stub
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}
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@Override
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public void visitCommander(Commander commander) {
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// TODO Auto-generated method stub
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}
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}

‎visitor/src/main/java/com/iluwatar/Unit.java‎

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package com.iluwatar;
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public abstract class Unit {
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private Unit[] children;
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public Unit(Unit ... children) {
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this.children = children;
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}
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public void accept(UnitVisitor visitor) {
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for (Unit child: children) {
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child.accept(visitor);
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}
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}
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}

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