設計モード(14)chain of responsibility

責任を逃れる

クラスタイプ

Trouble class

public class Trouble{
	private int number; //트러블 번호
    public Trouble (int number) {this.number = number ;}//트러블의 생성 
    
    public int getNumber(){ return number; } //트러블 번호를 얻는다. 
    public String toString(){ //트러블 문자열 표현 
    	return "[trouble"+ number +"]" ; 
    }
}

Support Class(親)

public abstract class Support{
	  private String name;    // 이 트러블 해결자의 이름 
    🚨private Support next;   //떠 넘기려는 곳 ; 다음 사람 
      public Support(String name){ 
    	  this.name = name;   //트러블 해결자의 생성
    }
    
	  public Support setNext(Support next){
    	  this.next=next;       //떠넘기려는 곳을 설정 
    	  return next; 
    }
    
    
  🚨public final void support(Trouble touble){  //트러블 해결 수순 
    	if(resolve(trouble)){
        	done(trouble);  //해결 
        }else if(next != null){
        	next.support(trouble);
        }else {
        	fail(trouble);  //미해결 
        }
    }
    
    
    public String toString(){     //문자열 표현 
    	return "[" +name + "]"; 
    }
    
    
  🚨protected abstract boolean resolve(Trouble trouble); //(구체적 클래스)자식들이 구체적으로 구현 
    protected void done (Trouble trouble){  //해결 
    	System.out.println(trouble+"is resolved by" +this.toString +"."); 
    }
    
    
    
 protected void fail(Trouble trouble){   //미해결 
 	System.out.println(trouble+"cannot be resolved.");
    }       
}

サブクラス

📌 NoSupport class

public class NoSupport extends Support{
	public NoSupport(String name){
    	super(name);   
    } 
    protected boolean resolve(Trouble trouble){ //해결 메소드 
    	return false;   //항상 false 반환 
    } 
}

📌 LimitSupport class

public class LimitSupport extends Support{
	private int limit;   // 이 번호 미만이면 해결 가능 
    public LimitSupport (String name, int limit){
    	super(name);
        this.limit=limit;
    }
    
  🚨protected boolean resolve(Trouble touble){
    	if( trouble.getNumber()<limit){
        	return true; 
       } else{
            retrun false;
         }
    }
}

📌 OddSupport class

public class OddSupport extends Support{
	public OddSupport(String name){
    	super (name);
    }
    
  🚨protected boolean resolve(Trouble trouble){
    if(trouble.getNumber()%2==1){
    	return true;
    }else {
    	return false;
   	}
  }    
}

📌 SpecialSupport class

public class SpecialSupport extends Support{
	private int number; // number; 이 번호만 해결가능
    public SpecialSupport(String name, int number){
    	super(name);
        this.number=number; 
    }
  🚨protected boolean resolve(Trouble trouble){
    
    	if (trouble.getName()==number;{
        	return true; 
            } else {
            	return false;
            }            
        }
}

📌 Main class

public class Main{
	public static void main(String[] args){
    	Support alice = new NoSupport("Alilce");
        Support bob = new LimitSupport("Bob",100);
        Support charlie = new SpecialSupport("charlie",429);
        Support diana = new LimitSupport("Diana",200);
        Support elmo= new OddSupport("Elmo");
        Support fred= new LimitSupport("Fred",300);
        
//사슬의 형성 
alice.setNext(bob).setNext(charlie).setNext(diana).setNext(elmo).setNext(fred);

//트러블의 발생 
for(int i=0; i<500; i+=33){
	alice.support(new Trouble(i);
	}                   
 }
}