/*
    * $Id: WildcardServletApplicationContext.java 1306435 2012-03-28 15:39:11Z nlebas $
    *
    * 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.tiles.request.servlet.wildcard;
  
  import java.io.IOException;
  import java.net.URL;
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.Collections;
  import java.util.Locale;
  
  import javax.servlet.ServletContext;
  
  import org.apache.tiles.request.ApplicationResource;
  import org.apache.tiles.request.locale.URLApplicationResource;
  import org.apache.tiles.request.servlet.ServletApplicationContext;
  import org.springframework.core.io.Resource;
  import org.springframework.core.io.support.ResourcePatternResolver;
  import org.springframework.web.context.support.ServletContextResourcePatternResolver;
  
  /**
   * Servlet-based implementation of the TilesApplicationContext interface that
   * can resolve resources even using wildcards.
   *
   * @version $Rev: 1306435 $ $Date: 2012-03-29 02:39:11 +1100 (Thu, 29 Mar 2012) $
   */
  public class WildcardServletApplicationContext extends ServletApplicationContext {
  
      /**
       * The pattern resolver.
       */
      protected ResourcePatternResolver resolver;
  
      /**
       * Constructor.
       *
       * @param servletContext The servlet context.
       */
      public WildcardServletApplicationContext(ServletContext servletContext) {
          super(servletContext);
          resolver = new ServletContextResourcePatternResolver(servletContext);
      }
  
      /** {@inheritDoc} */
      @Override
      public ApplicationResource getResource(String localePath) {
          ApplicationResource retValue = null;
          Collection<ApplicationResource> urlSet = getResources(localePath);
          if (urlSet != null && !urlSet.isEmpty()) {
              retValue = urlSet.iterator().next();
          }
          return retValue;
      }
  
      /** {@inheritDoc} */
      @Override
      public ApplicationResource getResource(ApplicationResource base, Locale locale) {
          ApplicationResource retValue = null;
          Collection<ApplicationResource> urlSet = getResources(base.getLocalePath(locale));
          if (urlSet != null && !urlSet.isEmpty()) {
              retValue = urlSet.iterator().next();
          }
          return retValue;
      }
  
      /** {@inheritDoc} */
      @Override
      public Collection<ApplicationResource> getResources(String path) {
          Resource[] resources;
          try {
              resources = resolver.getResources(path);
          } catch (IOException e) {
              return Collections.<ApplicationResource> emptyList();
          }
          Collection<ApplicationResource> resourceList = new ArrayList<ApplicationResource>();
          if (resources != null && resources.length > 0) {
              for (int i = 0; i < resources.length; i++) {
                  URL url;
                  try {
                      url = resources[i].getURL();
                     resourceList.add(new URLApplicationResource(url.toExternalForm(), url));
                 } catch (IOException e) {
                     // shouldn't happen with the kind of resources we're using
                     throw new IllegalArgumentException("no URL for " + resources[i].toString(), e);
                 }
             }
         }
         return resourceList;
     }
 }