/*
    * 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.application;
  
  import javax.faces.application.ProjectStage;
  import javax.faces.context.FacesContext;
  
  import org.apache.myfaces.resource.InternalClassLoaderResourceLoader;
  import org.apache.myfaces.shared.renderkit.html.util.ResourceUtils;
  import org.apache.myfaces.shared.resource.BaseResourceHandlerSupport;
  import org.apache.myfaces.shared.resource.ClassLoaderResourceLoader;
  import org.apache.myfaces.shared.resource.ExternalContextResourceLoader;
  import org.apache.myfaces.shared.resource.ResourceLoader;
  import org.apache.myfaces.shared.util.WebConfigParamUtils;
  
  /**
   * A ResourceHandlerSupport implementation for use with standard Java Servlet engines,
   * ie an engine that supports javax.servlet, and uses a standard web.xml file.
   * 
   * @author Leonardo Uribe (latest modification by $Author: lu4242 $)
   * @version $Revision: 1187069 $ $Date: 2011-10-20 16:45:23 -0500 (Thu, 20 Oct 2011) $
   */
  public class DefaultResourceHandlerSupport extends BaseResourceHandlerSupport
  {
  
      private static final String META_INF_RESOURCES = "META-INF/resources";
      private static final String RESOURCES = "/resources";
      private static final String META_INF_INTERNAL_RESOURCES = "META-INF/internal-resources";
  
      private ResourceLoader[] _resourceLoaders;
      
      public DefaultResourceHandlerSupport()
      {
          super();
      }
  
      public ResourceLoader[] getResourceLoaders()
      {
          if (_resourceLoaders == null)
          {
              FacesContext facesContext = FacesContext.getCurrentInstance(); 
              //The ExternalContextResourceLoader has precedence over
              //ClassLoaderResourceLoader, so it goes first.
              String renderedJSFJS = WebConfigParamUtils.getStringInitParameter(facesContext.getExternalContext(),
                      InternalClassLoaderResourceLoader.MYFACES_JSF_MODE,
                      ResourceUtils.JSF_MYFACES_JSFJS_NORMAL);
  
              if (facesContext.isProjectStage(ProjectStage.Development) ||
                   !renderedJSFJS.equals(ResourceUtils.JSF_MYFACES_JSFJS_NORMAL))
              {
                  _resourceLoaders = new ResourceLoader[] {
                          new ExternalContextResourceLoader(RESOURCES),
                          new InternalClassLoaderResourceLoader(META_INF_INTERNAL_RESOURCES),
                          new ClassLoaderResourceLoader(META_INF_RESOURCES)
                  };
              }
              else
              {
                  _resourceLoaders = new ResourceLoader[] {
                          new ExternalContextResourceLoader(RESOURCES),
                          new ClassLoaderResourceLoader(META_INF_RESOURCES)
                  };
              }
          }
          return _resourceLoaders;
      }
  }