pricingstrategyfactory.java

网上购物系统,实现了一个具体的框架

/**
 * @name PricingStrategyFactory.java
 * @author Administrator/pan
 * @version 1.1
 * @date 2009/2/17
 */
package com.digitstore.process.server;

import com.digitstore.process.server.sale.CompositeBestForCustomerPricingStrategy;
import com.digitstore.process.server.sale.ISalePricingStrategy;
import com.digitstore.process.server.sale.PercentDiscountPricingStrategy;

//返回各种定价组合策略的单子抽象工厂
public class PricingStrategyFactory {
	//组合定价策略
	private CompositeBestForCustomerPricingStrategy compBestCustPriStrategy;
	//打折定价策略
	private PercentDiscountPricingStrategy percDisPriStrategy;
	//工厂单子
	private static PricingStrategyFactory instance;
	
	//返回本工厂的一个单子
	public static synchronized PricingStrategyFactory getInstance(){
		if(instance == null){
			instance = new PricingStrategyFactory();
		}
		return instance;	
	}
	
	//返回一个顾客组合最佳策略
	public CompositeBestForCustomerPricingStrategy getCompBestCustPriStrategy(){
		if(compBestCustPriStrategy == null){
			compBestCustPriStrategy = new CompositeBestForCustomerPricingStrategy();
		}
		return compBestCustPriStrategy;
	}
	
	//返回一个打折定价策略
	public PercentDiscountPricingStrategy getPercDisPriStrategy(){
		if(percDisPriStrategy == null){
			percDisPriStrategy = new PercentDiscountPricingStrategy();
		}
		return percDisPriStrategy;
	}
	
	
	
	

}