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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   *   http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing,
13   * software distributed under the License is distributed on an
14   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15   * KIND, either express or implied.  See the License for the
16   * specific language governing permissions and limitations
17   * under the License.
18   */
19  
20  package org.apache.myfaces.tobago.facelets;
21  
22  import org.slf4j.Logger;
23  import org.slf4j.LoggerFactory;
24  
25  import java.net.URL;
26  
27  /**
28   * Provides facelets from the directory "META-INF/resources/" of any jar file in the classpath.
29   * With the Servlet 3.0 specification this is no longer needed.
30   * <p/>
31   * To configure this ResourceResolver put this code into the web.xml file:
32   * <pre>
33   *  &lt;context-param&gt;
34   *    &lt;param-name&gt;javax.faces.FACELETS_RESOURCE_RESOLVER&lt;/param-name&gt;
35   *    &lt;param-value&gt;
36   *        org.apache.myfaces.tobago.facelets.MetaInfResourcesClasspathResourceResolver
37   *    &lt;/param-value&gt;
38   *  &lt;/context-param&gt;
39   * </pre>
40   * <p/>
41   */
42  public class MetaInfResourcesClasspathResourceResolver extends DefaultResourceResolver {
43  
44    private static final Logger LOG = LoggerFactory.getLogger(MetaInfResourcesClasspathResourceResolver.class);
45  
46    public MetaInfResourcesClasspathResourceResolver() {
47      if (LOG.isDebugEnabled()) {
48        LOG.debug("MetaInfResourcesClasspathResourceResolver is configured to resolve resources.");
49      }
50    }
51  
52    public URL resolveUrl(String path) {
53      URL url = super.resolveUrl(path);
54      if (LOG.isDebugEnabled()) {
55        LOG.debug("default   url='" + url + "'");
56      }
57      if (url == null) {
58        if (path.startsWith("/")) {
59          path = path.substring(1);
60        }
61        path = "META-INF/resources/" + path;
62  
63        url = Thread.currentThread().getContextClassLoader().getResource(path);
64        if (LOG.isDebugEnabled()) {
65          LOG.debug("classpath url='" + url + "'");
66        }
67      }
68      return url;
69    }
70  }