享元模式11（14）

池技术：复用原对象

package structural;

import java.util.HashMap;

public class FlyweightPool {

    public static void main(String[] args) {

        int extrinsic = 22;
        Flyweight fx = FlyweightFactory.getFlyweight("X轴");
        fx.opration(extrinsic);
        Flyweight fy = FlyweightFactory.getFlyweight("Y轴");
        fy.opration(++extrinsic);
        Flyweight fz = FlyweightFactory.getFlyweight("Z轴");
        fz.opration(++extrinsic);
        Flyweight fx1 = FlyweightFactory.getFlyweight("X轴");
        fx1.opration(extrinsic);
        
        UnShareableFlyweight un = new UnShareableFlyweight("X轴");
        un.opration(++extrinsic);
        
        
        
    }

}

abstract class Flyweight{
    
    //内部状态
    public String instrinsic;
    //外部状态
    protected final String extrinsic;
    
    //享元角色必须接收外部状态
    public Flyweight(String extrinsic){
        this.extrinsic = extrinsic;
    }
    
    public void opration(int extrinsic){}

    public String getInstrinsic() {
        return instrinsic;
    }

    public void setInstrinsic(String instrinsic) {
        this.instrinsic = instrinsic;
    }
    
}

class ConcreteFlyweight extends Flyweight{

    public ConcreteFlyweight(String extrinsic) {
        super(extrinsic);
    }
    
    @Override
    public void opration(int extrinsic) {
        super.opration(extrinsic);
        System.out.println("具体flyweight："+extrinsic);
    }
}

class UnShareableFlyweight extends Flyweight{

    public UnShareableFlyweight(String extrinsic) {
        super(extrinsic);
    }
    
    @Override
    public void opration(int extrinsic) {
        super.opration(extrinsic);
        System.out.println("不共享的flyweight："+extrinsic);
    }
}

class FlyweightFactory{
    private static HashMap<String,Flyweight> pool = new HashMap<String,Flyweight>();
    public static Flyweight getFlyweight(String extrinsic){
        Flyweight flyweight = null;
        if(pool.containsKey(extrinsic)){
            flyweight = pool.get(extrinsic);
            System.out.print("已有 " + extrinsic + " 直接从池中取---->");
        }else{
            flyweight = new ConcreteFlyweight(extrinsic);
            pool.put(extrinsic, flyweight);
            System.out.print("创建 " + extrinsic + " 并从池中取出---->");
        }
        return flyweight;
    }
}