toolloader.java

Athena酒店小组_Athena酒店管理系统

/*
 * ToolLoader.java
 *
 * Created on 2007年5月12日, 下午11:23
 *
 * To change this template, choose Tools | Template Manager
 * and open the template in the editor.
 */

package utils;

import java.io.*;
import java.net.*;
import java.awt.*;
import java.util.*;
import java.awt.event.*;
import javax.swing.*;
import javax.xml.parsers.*;
import org.w3c.dom.*;

import plugin.*;

/**
 *
 * @author Virlene Cheng
 */
public class ToolLoader
{
    public static final String CONFIG_TOOL_FILE = "Module.Toolbar.xml";
    public static final String NODE_TOOL = "tool";
    
    public static final String TOOL_NAME = "name";
    public static final String TOOL_PACKAGE = "package";
    public static final String TOOL_CLASS = "class";
    
    private JToolBar toolBar;
    private IGUIResource guiRes;
    private IDBResource dbRes;
    private Hashtable<JButton, IAppPlugin> map = new Hashtable<JButton, IAppPlugin>();
    
    /** Creates a new instance of ToolLoader */
    public ToolLoader(IGUIResource guiRes, IDBResource dbRes)
    {
	this.guiRes = guiRes;
	this.dbRes = dbRes;
	
	//获取菜单栏
	this.toolBar = guiRes.getToolsBar();
    }
    
    /**
     * 将默认Xml文件中所配置的菜单树添加到菜单栏上
     * @param xmlFileName Xml文件
     */
    public void addToolWithDefaultXml()
    {
	buildTools(ToolLoader.CONFIG_TOOL_FILE);
    }
    
    /**
     * 将Xml文件中所配置的菜单树添加到菜单栏上
     * @param xmlFileName Xml文件
     */
    public void addToolWithXml(String xmlFileName)
    {
	buildTools(xmlFileName);
    }
    
    
    /**
     * 根据Xml文件名建立菜单
     * @param xmlFileName Xml文件名
     */
    private void buildTools(String xmlFileName)
    {
	try
	{
	    DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
	    DocumentBuilder db = dbf.newDocumentBuilder();
	    Document doc = db.parse(xmlFileName);
	    Element root = doc.getDocumentElement();
	    
	    //获取子节点
	    NodeList list = root.getElementsByTagName(ToolLoader.NODE_TOOL);
	    for (int i = 0; i < list.getLength(); i++)
	    {
		assembleTool(list.item(i));
	    }
	}
	catch(Exception ex)
	{
	    ex.printStackTrace();
	}
    }
    
    /**
     * 使用按钮装配工具项
     * @param node 工具项节点
     * @return 是否装配成功
     */
    private boolean assembleTool(Node node)
    {
	try
	{
	    //获取工具项属性
	    String toolName = node.getAttributes().getNamedItem(ToolLoader.TOOL_NAME).getNodeValue();
	    String packageFile = node.getAttributes().getNamedItem(ToolLoader.TOOL_PACKAGE).getNodeValue();
	    String className = node.getAttributes().getNamedItem(ToolLoader.TOOL_CLASS).getNodeValue();
	    
	    //设置工具按钮属性
	    JButton button = new JButton();
	    button.setText(toolName);
	    button.setFont(new Font("新宋体", Font.PLAIN,12));
	    
	    //读取插件
	    if(!loadPlugin(button, packageFile, className))
	    {
		return false;
	    }	 
	    	    
	    //为工具项添加事件
	    button.addActionListener(new ActionListener()
	    {
		public void actionPerformed(ActionEvent event)
		{
		    IAppPlugin appPlugin = map.get(event.getSource());
		    appPlugin.runApp();		    
		}
	    });
	    
	    toolBar.add(button);
	    return true;
	}
	catch(Exception ex)
	{
	    ex.printStackTrace();
	    return false;
	}
    }
    
    /**
     * 读取插件
     * @param packageFile 插件所在的jar文件
     * @param className 插件的完整类名
     * @return 是否读取成功
     */
    private boolean loadPlugin(JButton button, String packageFile, String className)
    {
	try
	{
	    //利用反射装载插件类
	    URL[] urls = new URL[1];
	    urls[0] = (new File(packageFile)).toURI().toURL();	  	  
	    ClassLoader cl = new URLClassLoader(urls);
	    Class cls = cl.loadClass(className);
	    
	    //将反射出的Object对象转化为IAppPlugin
	    Object obj = cls.newInstance();
	    IAppPlugin appPlugin = (IAppPlugin)obj;
	    
	    //为插件装载资源
	    appPlugin.loadResource(guiRes, dbRes);
	    
	    //插件初始化
	    appPlugin.initPlugin();	    	    
	    
	    //加入Hashtable
	    map.put(button, appPlugin);
	    
	    return true;
	}
	catch(Exception ex)
	{
	    ex.printStackTrace();
	    return false;
	}
    }
    
}