享元模式(flyweight)

标签：java   oop   struts1   享元模式   flyweight   

package model.flyweight1;
/*
 * 抽象享元角色
 */
public interface Share {
	public String work(String fettle);
}

package model.flyweight1;
/*
 * 具体享元角色
 * 属于conreteFlyweight角色
 */
public class ConcerteShare implements Share {
	//内藴状态
	private Character internalFettle = null;
	
	@Override
	public String work(String fettle) {
		String a = "internalFettle="+internalFettle+",exterior Fettle="+fettle;
		return a;
	}
	
	//将外藴状态传进去
	public ConcerteShare(Character fettle) {
		this.internalFettle = fettle;
	}
	
}

package model.flyweight1;

import java.util.Hashtable;
/*
 * 享元工厂角色类
 * 属于FlyweightFactory
 */
public class ShareFactory {
	private Hashtable matter = new Hashtable();
	private Share share;
	public ShareFactory(){
		 
	}
	public Share factory(Character fettle){
		if(matter.containsKey(fettle)){
			return (Share) matter.get(fettle);
		}else{
			share = new ConcerteShare(fettle);
			matter.put(fettle, share);
			return share;
		}
	}
}

package model.flyweight1;

public class Client {
	public static void main(String[] args) {
		ShareFactory factory = new ShareFactory();
		Share share =factory.factory(new Character('中'));
		
		System.out.println("字体:"+share.work("黑体"));
		System.out.println("字体:"+share.work("宋体"));
		share =factory.factory(new Character('外'));
		System.out.println("字体:"+share.work("仿体"));
	}
}

package model.flyweight2;
/*
 * 抽象享元角色
 */
public interface Share {
	public String work(String fettle);
}

package model.flyweight2;
/*
 * 具体享元角色
 * 属于conreteFlyweight角色
 */
public class ConcerteShare implements Share {
	//内藴状态
	private Character internalFettle = null;
	
	@Override
	public String work(String fettle) {
		String a = "internalFettle="+internalFettle+",exterior Fettle="+fettle;
		return a;
	}
	
	//将外藴状态传进去
	public ConcerteShare(Character fettle) {
		this.internalFettle = fettle;
	}
	
}

package model.flyweight2;

import java.util.HashMap;
import java.util.Hashtable;
import java.util.Iterator;
import java.util.Map;

/*
 *复合享元角色
 *即UnsharableFlyweight角色
 */
public class ConcreteCompositeShare implements Share {
	private Hashtable matter = new Hashtable(10);
	private Share share;
	
	//传入外藴状态
	@Override
	public String work(String fettle) {
		Share share = null;
		for (Iterator it=matter.entrySet().iterator(); it.hasNext();) {
			Map.Entry e = (Map.Entry)it.next();
			share = (Share) e.getValue();
			share.work(fettle);
		}
		return fettle;
	}
	
	public ConcreteCompositeShare(){
		
	}
	//添加一个新的单纯享元对象到聚合中
	public void add(Character key,Share share){
		matter.put(key, share);
	}
	
}

package model.flyweight2;

import java.util.Hashtable;
/*
 * 享元工厂角色类
 * 属于FlyweightFactory
 */
public class ShareFactory {
	private Hashtable matter = new Hashtable();
	private Share share;
	public ShareFactory(){
		 
	}
	//单享元工厂方法,所需状态以参数形式传进去
	public Share factory(Character fettle){
		if(matter.containsKey(fettle)){
			return (Share) matter.get(fettle);
		}else{
			share = new ConcerteShare(fettle);
			matter.put(fettle, share);
			return share;
		}
	}
	
	//享元工厂方法,运用String参数传入状态
	
	public Share factory(String compositeState){
		ConcreteCompositeShare compositeShare = new ConcreteCompositeShare();
		int length = compositeState.length();
		Character fettle = null;
		for (int i = 0; i < length; i++) {
			fettle = new Character(compositeState.charAt(i));
			System.out.println("factory("+fettle+")");
			compositeShare.add(fettle, this.factory(fettle));
		}
		return compositeShare;
	}
}

package model.flyweight2;

public class Client {
	public static void main(String[] args) {
		ShareFactory factory = new ShareFactory();
		Share share = factory.factory("东南西");
		System.out.println("内藴东南西,外藴均为字体:"+share.work("仿体"));
	}
}

享元模式(flyweight)

标签：java   oop   struts1   享元模式   flyweight   

原文地址：http://blog.csdn.net/qqmaye/article/details/44041177