/*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you 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 org.apache.myfaces.commons.resourcehandler.config;
  
  import java.io.IOException;
  import java.net.URL;
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.Enumeration;
  import java.util.List;
  
  import javax.faces.FacesException;
  import javax.faces.context.ExternalContext;
  
  import org.apache.myfaces.commons.util.ClassUtils;
  
  /**
   * Default implementation used to load myfaces-resources-config.xml files
   * 
   * @author Leonardo Uribe
   *
   */
  public class DefaultMyFacesResourceHandlerUrlProvider extends MyFacesResourceHandlerUrlProvider
  {
  
      public Collection<URL> getMetaInfConfigurationResources(ExternalContext context) throws IOException
      {
          ClassLoader contextClassLoader = ClassUtils.getContextClassLoader();
          Enumeration<URL> metaInfConfigUrls = null;
          List<URL> configUrls = new ArrayList<URL>(); 
  
          try
          {
              // NOTE that there could be multiple config files (in different jar files)
              metaInfConfigUrls = contextClassLoader.getResources(META_INF_CONFIG_FILE);
          }
          catch (IOException e)
          {
              throw new FacesException("Could not open " + MyFacesResourceHandlerUrlProvider.META_INF_CONFIG_FILE, e);
          }
  
          if (metaInfConfigUrls != null && metaInfConfigUrls.hasMoreElements())
          {
              while (metaInfConfigUrls.hasMoreElements())
              {
                  URL url = metaInfConfigUrls.nextElement();
                  if (url != null)
                  {
                      configUrls.add(url);
                  }
              }
          }
  
          return configUrls;
      }
  
      public URL getWebInfConfigurationResource(ExternalContext context) throws IOException
      {
          return context.getResource(WEB_INF_CONFIG_FILE);
      }
  }