/*
    * $Id$
    *
    * 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.servlet.wildcard;
  
  import java.io.IOException;
  import java.net.URL;
  import java.util.HashSet;
  import java.util.Set;
  
  import javax.servlet.ServletContext;
  
  import org.apache.tiles.servlet.context.ServletTilesApplicationContext;
  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 $Rev$ $Date$
   * @since 2.2.1
   */
  public class WildcardServletTilesApplicationContext extends
          ServletTilesApplicationContext {
  
      /**
       * The pattern resolver.
       *
       * @since 2.2.1
       */
      protected ResourcePatternResolver resolver;
  
      /**
       * Constructor.
       *
       * @param servletContext The servlet context.
       * @since 2.2.1
       */
      public WildcardServletTilesApplicationContext(ServletContext servletContext) {
          super(servletContext);
      }
  
      /** {@inheritDoc} */
      @Override
      public void initialize(ServletContext context) {
          super.initialize(context);
  
          resolver = new ServletContextResourcePatternResolver(context);
      }
  
      /** {@inheritDoc} */
      @Override
      public URL getResource(String path) throws IOException {
          URL retValue = null;
          Set<URL> urlSet = getResources(path);
          if (urlSet != null && !urlSet.isEmpty()) {
              retValue = urlSet.iterator().next();
          }
          return retValue;
      }
  
      /** {@inheritDoc} */
      @Override
      public Set<URL> getResources(String path) throws IOException {
          Set<URL> urlSet = null;
          Resource[] resources = resolver.getResources(path);
          if (resources != null && resources.length > 0) {
              urlSet = new HashSet<URL>();
              for (int i = 0; i < resources.length; i++) {
                  urlSet.add(resources[i].getURL());
              }
          }
          return urlSet;
      }
  }