java 设计模式学习笔记十六 chain of responsibility 职责链设计模式

chain of responsibility 职责链设计模式
是用一系列的classes处理一个请求，来一个请求，a先处理，如果没有处理，则b 处


理，如果没有处理，则由c处理，这样传递一个请求


示例代码如下：
方式一：=============
/**
* 多个请求
*
* @time 下午11:55:14
* @author retacn yue
* @Email [e-mail]
*/
public interface Handler {
// 方式一
// public void hanlderHelp();


// public void hanlderPrint();


// public void hanlderFormat();

}




/**
* 请求接口实现类
*
* @time 下午11:57:00
* @author retacn yue
* @Email [e-mail]
*/
public class ConcreateHandler implements Handler {
private Handler successor;


public ConcreateHandler(Handler successor) {
this.successor = successor;
}


@Override
public void hanlderHelp() {
successor.hanlderHelp();
}


@Override
public void hanlderPrint() {
successor.hanlderPrint();
}


@Override
public void hanlderFormat() {
successor.hanlderFormat();
}
}






方式二：=====================




/**
*
* @time 下午11:54:25
* @author retacn yue
* @Email [e-mail]
*/
public interface HelpHandler {
public void hanlderHelp();
}




/**
*
* @time 下午11:54:25
* @author retacn yue
* @Email [e-mail]
*/
public interface FormatHandler {
public void hanlderFormat();
}


/**
*
* @time 下午11:54:25
* @author retacn yue
* @Email [e-mail]
*/
public interface PrintHandler {
public void hanlderPrint();
}










/**
* 请求接口实现类
*
* @time 下午11:57:00
* @author retacn yue
* @Email [e-mail]
*/
public class ConcreateHandler2 implements PrintHandler, HelpHandler,


FormatHandler {
private HelpHandler helpHandlerSuccessor;
private PrintHandler printHandlerSuccessor;
private FormatHandler formatHandlerSuccessor;


public ConcreateHandler2(HelpHandler helpHandlerSuccessor,


PrintHandler printHandlerSuccessor, FormatHandler formatHandlerSuccessor)


{
this.helpHandlerSuccessor = helpHandlerSuccessor;
this.printHandlerSuccessor = printHandlerSuccessor;
this.formatHandlerSuccessor = formatHandlerSuccessor;
}


@Override
public void hanlderFormat() {
this.formatHandlerSuccessor.hanlderFormat();
}


@Override
public void hanlderHelp() {
this.helpHandlerSuccessor.hanlderHelp();
}


@Override
public void hanlderPrint() {
this.printHandlerSuccessor.hanlderPrint();
}


}
方式三：==============


/**
* 请求
*
* @time 上午12:09:00
* @author retacn yue
* @Email [e-mail]
*/
public class Request {
private String type;


public String getType() {
return type;
}


public Request(String type) {
this.type = type;
}


}






/**
* 请求接口实现类
*
* @time 下午11:57:00
* @author retacn yue
* @Email [e-mail]
*/
public class ConcreateHandler3 implements Handler {


private Handler successor;


public ConcreateHandler3(Handler successor) {
this.successor = successor;
}


@Override
public void handlerRequest(Request request) {
if (request.getType().equals("help")) {
} else if (request.getType().equals("print")) {


} else if (request.getType().equals("format")) {
}
}
}