标准的责任链模式(读书笔记)

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蓝枫居士 2022-08-18 19:28:02 博主文章分类：设计模式

package china.of.responsibility.pattern;

public abstract class Handler {
  protected Handler successor;
  protected String name;
  
  public Handler(String name){
    this.name=name;    
  }
  public String getName(){
    return name;
  }
  public void setSuccessor(Handler succHandler){
    this.successor=succHandler;
  }
  public abstract  void exect(Request request);

}

package china.of.responsibility.pattern;

public class Request {
  private String name;
  private int count;
  private String purpose;
  
  public Request(String name,int count,String purpose){
    this.name=name;
    this.count=count;
    this.purpose=purpose;
  }
//省略get/set方法
}

package china.of.responsibility.pattern;

public class Handler_Lev1 extends Handler{

  public Handler_Lev1(String name) {
    super(name);
    // TODO Auto-generated constructor stub
  }

  @Override
  public void exect(Request request) {
    if (request.getCount()<50) {
      System.out.println(this.name+"同意买"+
    request.getCount()+"件"+request.getName());      
    }
    else {
      this.successor.exect(request);
    }  
  }
}

package china.of.responsibility.pattern;

public class Handler_Lev2 extends Handler{

  public Handler_Lev2(String name) {
    super(name);
    // TODO Auto-generated constructor stub
  }

  @Override
  public void exect(Request request) {
    if (request.getCount()<100) {
      System.out.println(this.name+"同意买"+
    request.getCount()+"件"+request.getName());      
    }
    else if(request.getCount()<120&&this.name=="杨过他媳妇 小龙女"){
      System.out.println(this.name+"同意买"+
          request.getCount()+"件"+request.getName());    
    }
    else {
      successor.exect(request);
    }
  }
}

package china.of.responsibility.pattern;

public class Handler_Lev3 extends Handler{

  public Handler_Lev3(String name) {
    super(name);
    // TODO Auto-generated constructor stub
  }

  @Override
  public void exect(Request request) {
    if (request.getCount()<150) {
      System.out.println(this.name+"同意买"+
    request.getCount()+"件"+request.getName());      
    }
    else {
      System.out.println("拒绝买"+request.getCount()+"件"
    +request.getName());
    }
    
  }
}

package china.of.responsibility.pattern;


public class Client {
  public static void main(String[] args) {
     Handler lev1,lev2,lev2_5,lev3;
     lev1=new Handler_Lev1("张无忌");
     lev2=new Handler_Lev2("杨过");
     lev2_5=new Handler_Lev2("杨过他媳妇 小龙女");
     lev3=new Handler_Lev3("黄药师");
     
     Request request1=new Request("屠龙刀",20, "倚天屠龙记");
     Request request2=new Request("玄铁剑",115, "神雕侠侣");
     Request request3=new Request("碧玉箫",125, "射雕英雄传");
     Request request4=new Request("九阴真经",170, "射雕英雄传");
     
     lev1.setSuccessor(lev2);
     lev2.setSuccessor(lev2_5);
     lev2_5.setSuccessor(lev3);
     
     lev1.exect(request1);
     lev1.exect(request2);
     lev1.exect(request3);
     lev1.exect(request4);
  }
}