permissionxmlparser.java

非常有影响的 j道 论 坛 源码 国外很有明的专家编写的 ....对java爱好者很有参考价值

/*
 * Copyright 2003-2005 the original author or authors.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
 */
package com.jdon.jivejdon.auth;

import java.io.InputStream;
import java.util.Iterator;
import java.util.List;

import org.jdom.Document;
import org.jdom.Element;
import org.jdom.JDOMException;
import org.jdom.input.SAXBuilder;

import com.jdon.controller.config.DTDEntityResolver;
import com.jdon.jivejdon.model.auth.PermissionRule;
import com.jdon.util.Debug;
import com.jdon.util.FileLocator;

/**
 * @author <a href="mailto:banqJdon <AT>jdon.com">banq </a>
 *  
 */

public class PermissionXmlParser {
    private final static String module = PermissionXmlParser.class.getName();
    private FileLocator fileLocator = new FileLocator();
    
    private String configFileName;
       

    /**
     * @param permissionConfigureName
     */
    public PermissionXmlParser(String configFileName) {
        this.configFileName = configFileName;
    }
    
    public PermissionRule parse()  {
      PermissionRule pr = null;
      try {
        if (configFileName == null)
           return new PermissionRule();
        
        Document doc = buildDocument(configFileName);       
        if (doc == null)
          return new PermissionRule();     
        
        Element root = doc.getRootElement();

        pr = parse(root);

        Debug.logVerbose("<!--   config load finished -->", module);
      } catch (Exception ex) {
        Debug.logError("configure FileName: " + configFileName + " parsed error: " + ex, module);
      }
      return pr;
    }

    private Document buildDocument(String configFileName)  {    
      Debug.logVerbose(" locate configure file  :" + configFileName, module);    
      try {
          InputStream xmlStream = fileLocator.getConfPathXmlStream(configFileName);    
          if (xmlStream == null){
              Debug.logVerbose("can't locate file:" + configFileName, module);
              return null;
          }else{
              Debug.logVerbose(" configure file found :" + xmlStream, module);
          }

          SAXBuilder builder = new SAXBuilder();
          builder.setEntityResolver(new DTDEntityResolver());
          Document doc = builder.build(xmlStream);
          Debug.logVerbose(" got mapping file ", module);
          return doc;
      } catch (Exception e) {
          Debug.logError(" JDOMException error: " + e, module);
          return null;
      }
    }

    private PermissionRule parse(Element root) throws Exception {
    	
      PermissionRule pr = new PermissionRule();  
      List services = root.getChildren("service");      
      Iterator iter = services.iterator();
      while (iter.hasNext()) {
        Element service = (Element) iter.next();
        String refName = service.getAttributeValue("ref");
        if (service.getChildren("method") != null) {
          Iterator i = service.getChildren("method").iterator();
          while (i.hasNext()) {
            Element method = (Element) i.next();
            String methodName = method.getAttributeValue("name");
            Debug.logVerbose(" method name=" + methodName, module);
            List roles = method.getChildren("role");
            Iterator ii = roles.iterator();
            while (ii.hasNext()) {
                Element role = (Element)ii.next();
                String roleName = role.getText();
                Debug.logVerbose(" role name=" + roleName, module);
                pr.putRule(refName, methodName, roleName);                
            }
          }
        }
      }
      return pr;
    }
    
  
    
  
}