设计模式(一)：责任链学习

关于责任链的学习，具体参考代码
最关键点就是面向接口的编程思想
抽象类Manager：setSuperior(manager) 设置上级
抽象方法handler(requets)
由具体的子类去实现，根据不同的权限
这种设计模式优点：
1. 解除耦合
2. 容易扩展，比如增加ceo具体类，只要实现有关的handler方法和上下级，就可以使用了

以上的知识点来自"大话设计模式"一书。

package reponsibilitylink;

/**
 * 责任链
 * 1. 抽象经理，
 *    abstract void hanler(request), 
 *    setSuperior()设置上级
 * 2. 具体经理类
 *    小组长：
 *        设置上级
 *        逻辑处理方法hanller()
 *               具体权限设置，如果请求类型和内容符合，则处理
 *    总经理：
 *        设置上级
 *        逻辑处理方法hanller()
 *               如果请求类型和内容符合，则处理
 * 3. 请求实体类
 *    type, content
 * 4. 
 * @author root
 *
 */
public class Client {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		GeneralManager general = new GeneralManager("generalmanager");
		TeamLeader teamLeader = new TeamLeader("teamleader");
		teamLeader.setSuperior(general);

		Request request = new Request();
		request.setType(1);
		request.setContent("病假");		
		teamLeader.handle(request);

		request = new Request();
		request.setType(2);
		request.setContent("加薪");
		teamLeader.handle(request);

	}

}

package reponsibilitylink;

public abstract class Manager {

	Manager superior;
	private String name;

	public Manager(String name){
		this.name = name;
	}

	public void setSuperior(Manager superior){
		this.superior = superior;
	}

	protected abstract void handle(Request request);
}

package reponsibilitylink;

public class Request {
	int type;
	String content;

	public int getType() {
		return type;
	}

	public void setType(int type) {
		this.type = type;
	}

	public String getContent() {
		return content;
	}

	public void setContent(String content) {
		this.content = content;
	}

}

[code="java"]
package reponsibilitylink;

public class TeamLeader extends Manager {

	public TeamLeader(String name) {
		super(name);
		// TODO Auto-generated constructor stub
	}

	protected void handle(Request request) {
		// TODO Auto-generated method stub
		if(request.getType()==1){
			System.out.println("同意: " + request.content);
		}else{
			if(superior!=null){
				superior.handle(request);
			}
		}
	}

}

package reponsibilitylink;

public class GeneralManager extends Manager {

	public GeneralManager(String name) {
		super(name);
		// TODO Auto-generated constructor stub
	}

	@Override
	protected void handle(Request request) {
		// TODO Auto-generated method stub
		if(request.getType()>1){
			System.out.println("总经理批准 请求： " + request.getContent());
		}
	}

}