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iluwatariluwatar
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added chain of responsibility sample
1 parent a53c217 commit 9e7db12

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10 files changed

+189
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10 files changed

+189
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lines changed

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

‎chain/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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OrcKing king = new OrcKing();
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king.makeRequest(new Request(RequestType.DEFEND_CASTLE, "defend castle"));
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king.makeRequest(new Request(RequestType.TORTURE_PRISONER, "torture prisoner"));
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king.makeRequest(new Request(RequestType.COLLECT_TAX, "collect tax"));
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}
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}

‎chain/src/main/java/com/iluwatar/OrcCommander.java‎

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package com.iluwatar;
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public class OrcCommander extends RequestHandler {
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public OrcCommander(RequestHandler handler) {
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super(handler);
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}
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@Override
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public void handleRequest(Request req) {
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if (req.getRequestType().equals(RequestType.DEFEND_CASTLE)) {
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printHandling(req);
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} else {
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super.handleRequest(req);
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}
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}
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@Override
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public String toString() {
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return "Orc commander";
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}
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}

‎chain/src/main/java/com/iluwatar/OrcKing.java‎

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package com.iluwatar;
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public class OrcKing {
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RequestHandler chain;
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public OrcKing() {
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buildChain();
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}
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private void buildChain() {
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chain = new OrcCommander(new OrcOfficer(new OrcSoldier(null)));
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}
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public void makeRequest(Request req) {
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chain.handleRequest(req);
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}
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}

‎chain/src/main/java/com/iluwatar/OrcOfficer.java‎

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package com.iluwatar;
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public class OrcOfficer extends RequestHandler {
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public OrcOfficer(RequestHandler handler) {
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super(handler);
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}
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@Override
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public void handleRequest(Request req) {
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if (req.getRequestType().equals(RequestType.TORTURE_PRISONER)) {
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printHandling(req);
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} else {
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super.handleRequest(req);
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}
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}
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@Override
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public String toString() {
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return "Orc officer";
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}
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}

‎chain/src/main/java/com/iluwatar/OrcSoldier.java‎

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package com.iluwatar;
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public class OrcSoldier extends RequestHandler {
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public OrcSoldier(RequestHandler handler) {
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super(handler);
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}
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@Override
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public void handleRequest(Request req) {
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if (req.getRequestType().equals(RequestType.COLLECT_TAX)) {
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printHandling(req);
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} else {
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super.handleRequest(req);
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}
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}
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@Override
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public String toString() {
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return "Orc soldier";
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}
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}

‎chain/src/main/java/com/iluwatar/Request.java‎

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package com.iluwatar;
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public class Request {
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private String requestDescription;
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private RequestType requestType;
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public Request(RequestType requestType, String requestDescription) {
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this.setRequestType(requestType);
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this.setRequestDescription(requestDescription);
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}
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public String getRequestDescription() {
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return requestDescription;
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}
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public void setRequestDescription(String requestDescription) {
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this.requestDescription = requestDescription;
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}
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public RequestType getRequestType() {
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return requestType;
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}
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public void setRequestType(RequestType requestType) {
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this.requestType = requestType;
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}
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@Override
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public String toString() {
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return getRequestDescription();
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}
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}

‎chain/src/main/java/com/iluwatar/RequestHandler.java‎

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package com.iluwatar;
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public abstract class RequestHandler {
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private RequestHandler next;
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public RequestHandler(RequestHandler next) {
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this.next = next;
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}
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public void handleRequest(Request req) {
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if (next != null) {
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next.handleRequest(req);
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}
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}
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protected void printHandling(Request req) {
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System.out.println(this + " handling request \"" + req + "\"");
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}
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@Override
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public abstract String toString();
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}

‎chain/src/main/java/com/iluwatar/RequestType.java‎

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package com.iluwatar;
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public enum RequestType {
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DEFEND_CASTLE,
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TORTURE_PRISONER,
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COLLECT_TAX
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}

‎pom.xml‎

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<module>facade</module>
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<module>flyweight</module>
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<module>proxy</module>
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<module>chain</module>
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</modules>
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<build>

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