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摘要: java设计模式之Chain of Responsibility
public interface Handler{
public void handleRequest();
}
public interface Handler{
public void handleHelp();
public void handlePrint();
public void handleFormat();
}
public class ConcreteHandler implements Handler{
private Handler successor;
public ConcreteHandler(Handler successor){
this.successor=successor;
}
public void handleHelp(){
//具体处理请求Help的代码
...
}
public void handlePrint(){
//如果是print 转去处理Print
successor.handlePrint();
}
public void handleFormat(){
//如果是Format 转去处理format
successor.handleFormat();
}
}
public interface HelpHandler{
public void handleHelp();
}
public interface PrintHandler{
public void handlePrint();
}
public interface FormatHandler{
public void handleFormat();
}
public class ConcreteHandler
implements HelpHandler,PrintHandler,FormatHandlet{
private HelpHandler helpSuccessor;
private PrintHandler printSuccessor;
private FormatHandler formatSuccessor;
public ConcreteHandler(HelpHandler helpSuccessor,PrintHandler printSuccessor,FormatHandler formatSuccessor)
{
this.helpSuccessor=helpSuccessor;
this.printSuccessor=printSuccessor;
this.formatSuccessor=formatSuccessor;
}
public void handleHelp(){
.......
}
public void handlePrint(){this.printSuccessor=printSuccessor;}
public void handleFormat(){this.formatSuccessor=formatSuccessor;}
}
public interface Handler{
public void handleRequest(String request);
}
那么Handler实现代码如下:
public class ConcreteHandler implements Handler{
private Handler successor;
public ConcreteHandler(Handler successor){
this.successor=successor;
}
public void handleRequest(String request){
if (request.equals("Help")){
//这里是处理Help的具体代码
}else
//传递到下一个
successor.handle(request);
}
}
}
public interface Handler{
public void handleRequest(Request request);
}
Request类的定义:
public class Request{
private String type;
public Request(String type){this.type=type;}
public String getType(){return type;}
public void execute(){
//request真正具体行为代码
}
}
public class ConcreteHandler implements Handler{
private Handler successor;
public ConcreteHandler(Handler successor){
this.successor=successor;
}
public void handleRequest(Request request){
if (request instanceof HelpRequest){
//这里是处理Help的具体代码
}else if (request instanceof PrintRequst){
request.execute();
}else
//传递到下一个
successor.handle(request);
}
}
}