mysqlfactory.java

一个用jsp技术实现的新闻发布系统

package net.ijsp.news.news.mysql;

/**
*  Title  Factory
*  @author: ccjsmile
*  Company: http://www.ijsp.net
*  Copyright: Copyright (c) 2003
*  @version 1.0 beta
*/
import net.ijsp.news.news.Factory;
import net.ijsp.news.news.User;
import net.ijsp.news.news.UserFactory;
import net.ijsp.news.news.Board;
import net.ijsp.news.news.BoardFactory;
import net.ijsp.news.news.News;
import net.ijsp.news.news.NewsFactory;
import net.ijsp.news.search.*;
import net.ijsp.news.search.database.*;

public class MysqlFactory extends Factory {
	
	private static UserFactory userFactory = null;
	private static BoardFactory boardFactory = null;
	private static NewsFactory newsFactory = null;

	private final static String className = "net.ijsp.news.news.mysql.MysqlUserFactory";
	private final static String className1 = "net.ijsp.news.news.mysql.MysqlBoardFactory";
	private final static String className2 = "net.ijsp.news.news.mysql.MysqlNewsFactory";
	
	public MysqlFactory() {
	
	}

	/**
	* 获取 User 实例
	*/
	public User getUser() {
		return (User)new MysqlUser();
	}	

	/**
	* 获取 UserFactory 实例
	*/
	public UserFactory getUserFactory()  {
		if(userFactory==null) {
			try {
				Class c = Class.forName(className);
				userFactory = (UserFactory)c.newInstance();
			} catch (Exception ex) {
	            ex.printStackTrace();
		    }
		}
		return userFactory;
	}

	/**
	* 获取 Board 实例
	*/
	public Board getBoard() {
		return (Board)new MysqlBoard();
	}


	/**
	* 获取 BoardFactory 实例
	*/
	public  BoardFactory getBoardFactory()  {
		if(boardFactory==null) {
			try {
				Class c = Class.forName(className1);
				boardFactory = (BoardFactory)c.newInstance();
			} catch (Exception ex) {
	            ex.printStackTrace();
		    }
		}
		return boardFactory;
	}

	/**
	* 获取 News 实例
	*/
	public News getNews() {
		return  (News)new MysqlNews();
	}

	/**
	* 获取 NewsFactory 实例
	*/
	public NewsFactory getNewsFactory() {
		if(newsFactory==null) {
			try{
				Class c = Class.forName(className2);
				newsFactory = (NewsFactory)c.newInstance();
			}catch(Exception ex){
				System.err.println(ex);
			}
		}
		return newsFactory;
	}
	
	/**
	* 设置检索
	*/
	public SearchManager getSearchManager() {
		return (SearchManager)new DbSearchManager();
	}

	/**
	* 检索
	*/
	public Query getQuery() {
		return (Query)new DbQuery();
	}

}