mainmenumanager.java

《j2ee开发全程实录》随书源码

package com.cownew.PIS.framework.client.menu;

import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.swing.JMenuItem;

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.io.SAXReader;
import org.dom4j.tree.DefaultElement;

import com.cownew.ctk.common.ExceptionUtils;
import com.cownew.ctk.constant.StringConst;
import com.cownew.ctk.io.ResourceUtils;

public class MainMenuManager
{
	private Map menuItemMap = new HashMap(50);
	
	private static MainMenuManager instance;

	private MainMenuManager()
	{
		super();
	}

	public static MainMenuManager getManager()
	{
		if (instance == null)
		{
			instance = new MainMenuManager();
		}
		return instance;
	}

	/**
	 * 获取配置文件定义的所有菜单项
	 * @return
	 */
	public MainMenuItemInfo[] getAllMenuItem()
	{
		InputStream beansXFStream = null;
		try
		{
			beansXFStream = getClass().getResourceAsStream(
					"/com/cownew/PIS/framework/client/menu/MainMenu.xml");
			Document doc = new SAXReader().read(new InputStreamReader(
					beansXFStream, StringConst.UTF8));
			List itemList = doc.selectNodes("//Config/Item");
			MainMenuItemInfo[] menuItemInfos = new MainMenuItemInfo[itemList.size()];
			for (int i = 0, n = itemList.size(); i < n; i++)
			{
				DefaultElement beanElement = (DefaultElement) itemList.get(i);				
				String path = beanElement.attributeValue("path");
				MainMenuItemInfo itemInfo = new MainMenuItemInfo(path);
				itemInfo.setText(beanElement.getText());				
				itemInfo.setUiClass(beanElement.attributeValue("uiClass"));
				menuItemInfos[i]  = itemInfo;			
			}
			
			return menuItemInfos;
		} catch (UnsupportedEncodingException e)
		{
			throw ExceptionUtils.toRuntimeException(e);
		} catch (DocumentException e)
		{
			throw ExceptionUtils.toRuntimeException(e);
		} finally
		{
			ResourceUtils.close(beansXFStream);
		}
	}
	
	/**
	 * 注册菜单项
	 * @param path 菜单项的path
	 * @param menuItem 菜单项对应的JMenuItem实例
	 */
	public void registerMenuItem(String path,JMenuItem menuItem)
	{
		menuItemMap.put(path, menuItem);
	}
	
	/**
	 * 取得path对应的菜单项JMenuItem实例
	 * @param path 要查找的菜单项的path
	 * @return
	 */
	public JMenuItem queryMenuItem(String path)
	{
		return (JMenuItem) menuItemMap.get(path);
	}
}