productservicefactory.java

网上购物系统,实现了一个具体的框架

/**
 * @name ProductServiceFactory.java
 * @author Administrator/pan
 * @version 1.1
 * @date 2009/2/16
 */
package com.digitstore.process.server;

import com.digitstore.process.domain.Store;
import com.digitstore.process.domain.product.ProductCatalog;
import com.digitstore.process.server.sale.ISalePricingStrategy;

//提供各种和产品相关服务的单子抽象工厂
public class ProductServiceFactory {
	private  ProductCatalog productCatalog;
	private static ProductServiceFactory instance;
	private Store store;
	
	//返回本工厂的单子实例
	public static synchronized ProductServiceFactory getInstance(){
		if(instance == null){
			instance = new ProductServiceFactory();
		}
		return instance;
	}
	//获得商品条目
	public ProductCatalog getProductCatalog(){
		if(productCatalog == null){
			productCatalog = new ProductCatalog();	
		}
		return productCatalog;
	}
	
	//获得一个商店实例
	public Store getStore(){
		if(store == null){
			store = new Store();
		}
		return store;
	}
	
	
	
}