/*

  * $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;

     }

 }