permissionserviceimpl.java

《j2ee开发全程实录》随书源码

package com.cownew.PIS.base.permission.bizLayer;

import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

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

import com.cownew.PIS.base.permission.common.IPermissionService;
import com.cownew.PIS.base.permission.common.PermissionException;

import com.cownew.PIS.framework.server.helper.ServerConfig;
import com.cownew.ctk.common.ExceptionUtils;
import com.cownew.ctk.constant.StringConst;
import com.cownew.ctk.io.ResourceUtils;

public class PermissionServiceImpl implements IPermissionService
{
	private static List allPermissionItemList;

	public List getAllPermissionItem() 
	{
		if(allPermissionItemList!=null)
		{
			return allPermissionItemList;
		}
		
		allPermissionItemList = new ArrayList();
		try
		{
			String[] beanFiles = ServerConfig.getInstance().getBeanFiles();
			for (int i = 0, n = beanFiles.length; i < n; i++)
			{
				List pItem = getPermissionItem(beanFiles[i]);
				if (pItem != null && pItem.size() > 0)
				{
					allPermissionItemList.addAll(pItem);
				}
			}
		} catch (UnsupportedEncodingException e)
		{
			ExceptionUtils.toRuntimeException(e);
		} catch (DocumentException e)
		{
			ExceptionUtils.toRuntimeException(e);
		}
		checkPermItemDup(allPermissionItemList);			
		return allPermissionItemList;		
	}
	
	/**
	 * 检验权限项定义是否有名称重复的
	 * @param permList
	 * @
	 */
	private void checkPermItemDup(List permList) 
	{
		Set set = new HashSet(permList.size());
		for (int i = 0, n = permList.size(); i < n; i++)
		{
			Object obj = permList.get(i);
			if (set.contains(obj))
			{
				throw new PermissionException(
						PermissionException.PERMISSIONITEMDUP,
						new Object[] { obj.toString() });
			}
			set.add(obj);
		}
	}

	/**
	 * 得到文件beanFile中定义的所有权限项
	 * @param beanFile
	 * @return
	 * @throws UnsupportedEncodingException
	 * @throws DocumentException
	 */
	private List getPermissionItem(String beanFile)
			throws UnsupportedEncodingException, DocumentException
	{
		InputStream beansXFStream = null;
		List permList = new ArrayList();
		try
		{
			beansXFStream = getClass().getResourceAsStream(beanFile);
			SAXReader saxReader = new SAXReader(false);
			InputStreamReader inReader = new InputStreamReader(beansXFStream,
					StringConst.UTF8);
			Document doc = saxReader.read(inReader);
			List beanList = doc.selectNodes("//beans/bean");
			for (int i = 0, n = beanList.size(); i < n; i++)
			{
				DefaultElement beanElement = (DefaultElement) beanList.get(i);
				List properties = beanElement.selectNodes("property");
				for (int j = 0, m = properties.size(); j < m; j++)
				{
					DefaultElement prop = (DefaultElement) properties.get(j);
					Attribute attribute = prop.attribute("name");
					if (attribute != null
							&& attribute.getValue().equals(
									"permissionAttributes"))
					{
						permList.addAll(getPermissionsFromProp(prop));
					}
					prop = null;
				}
				beanElement = null;
				properties = null;
			}
		} finally
		{
			ResourceUtils.close(beansXFStream);
		}
		return permList;
	}

	/**
	 * 得到bean xml文件中props节点中所有的权限项
	 * @param prop
	 * @return
	 */
	private List getPermissionsFromProp(DefaultElement prop)
	{
		List retList = new ArrayList();
		List propList = prop.selectNodes("props/prop");
		for(int i=0,n=propList.size();i<n;i++)
		{
			DefaultElement beanElement = (DefaultElement) propList.get(i);
			String permItem = beanElement.getText().trim();
			retList.add(permItem);
		}
		return retList;
		
	}

}