/*

  * 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.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.context.ExternalContext;

 import org.apache.myfaces.shared.config.MyfacesConfig;

 import org.apache.myfaces.shared.util.ClassUtils;

 import org.apache.myfaces.spi.FacesConfigResourceProvider;

 import org.apache.myfaces.util.ContainerUtils;

 import org.apache.myfaces.config.util.GAEUtils;

 import org.apache.myfaces.view.facelets.util.Classpath;

 /**

  * 

  * @since 2.0.2

  * @author Leonardo Uribe

  */

 public class DefaultFacesConfigResourceProvider extends FacesConfigResourceProvider

 {

     private static final String META_INF_PREFIX = "META-INF/";

     private static final String FACES_CONFIG_SUFFIX = ".faces-config.xml";

     /**

      * <p>Resource path used to acquire implicit resources buried

      * inside application JARs.</p>

      */

     private static final String FACES_CONFIG_IMPLICIT = "META-INF/faces-config.xml";

     public DefaultFacesConfigResourceProvider()

     {

         super();

     }

     @Override

     public Collection<URL> getMetaInfConfigurationResources(

             ExternalContext context) throws IOException

     {

         List<URL> urlSet = new ArrayList<URL>();

         //This usually happens when maven-jetty-plugin is used

         //Scan jars looking for paths including META-INF/faces-config.xml

         Enumeration<URL> resources = getClassLoader().getResources(FACES_CONFIG_IMPLICIT);

         while (resources.hasMoreElements())

         {

             urlSet.add(resources.nextElement());

         }

         String jarFilesToScanParam = MyfacesConfig.getCurrentInstance(context).getGaeJsfJarFiles();

         jarFilesToScanParam = jarFilesToScanParam != null ? jarFilesToScanParam.trim() : null;

         if (ContainerUtils.isRunningOnGoogleAppEngine(context) && 

             jarFilesToScanParam != null &&

             jarFilesToScanParam.length() > 0)

         {

             Collection<URL> urlsGAE = GAEUtils.searchInWebLib(

                     context, getClassLoader(), jarFilesToScanParam, META_INF_PREFIX, FACES_CONFIG_SUFFIX);

             if (urlsGAE != null)

             {

                 urlSet.addAll(urlsGAE);

             }

         }

         else

         {

             //Scan files inside META-INF ending with .faces-config.xml

             URL[] urls = Classpath.search(getClassLoader(), META_INF_PREFIX, FACES_CONFIG_SUFFIX);

             for (int i = 0; i < urls.length; i++)

             {

                 urlSet.add(urls[i]);

             }

         }

         return urlSet;

     }

     private ClassLoader getClassLoader()

     {

         ClassLoader loader = ClassUtils.getContextClassLoader();

         if (loader == null)

         {

             loader = this.getClass().getClassLoader();

         }

         return loader;

     }

 }