ParsedResourceURLProtocolHandler


1   /*
2    * Copyright 1999-2004 The Apache Software Foundation.
3    * 
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    * 
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    * 
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  package org.apache.cocoon.components.url;
17  
18  import org.apache.batik.util.AbstractParsedURLProtocolHandler;
19  import org.apache.batik.util.ParsedURL;
20  import org.apache.batik.util.ParsedURLData;
21  
22  /**
23   * Provide an extension to Batik to handle the "resource:" protocol.  This class
24   * uses the <code>Thread.getContextClassLoader()</code> classloader to get resources.
25   * It is safe to use this URL with multiple Cocoon webapps running.
26   *
27   * @author <a HREF="mailto:bloritsch@apache.org">Berin Loritsch</a>
28   * @version CVS $Id: ParsedResourceURLProtocolHandler.java 30932 2004-07-29 17:35:38Z vgritsenko $
29   */
30  public class ParsedResourceURLProtocolHandler extends AbstractParsedURLProtocolHandler {
31  
32      /**
33       * Create a new instance, this doesn't do much beyond register the type of
34       * protocol we handle.
35       */
36      public ParsedResourceURLProtocolHandler() {
37          super("resource");
38      }
39  
40      /**
41       * Getbase.getPath() the ParsedURLData for the context.  Absolute URIs are specified like
42       * "resource://".
43       */
44      public ParsedURLData parseURL(String   uri) {
45          ParsedURLData urldata = null;
46          String   path = uri.substring("resource:/".length());
47          urldata = new ParsedURLData(Thread.currentThread().getContextClassLoader().getResource(path));
48  
49          if ("file".equals(urldata.protocol)) {
50              urldata.host = null;
51              urldata.port = -1;
52          } else if (null == urldata.host) {
53              urldata.port = -1;
54          } else if (urldata.port < 0) {
55              urldata.host = null;
56          }
57  
58          return urldata;
59      }
60  
61      /**
62       * The build the relative URL.  Relative URIs are specified like "resource:".
63       */
64      public ParsedURLData parseURL(ParsedURL base, String   uri) {
65          StringBuffer   newURI = new StringBuffer  ("resource://");
66          newURI.append(base.getPath());
67  
68          if ( !newURI.toString().endsWith("/") ) {
69              newURI.append("/");
70          }
71  
72          newURI.append(uri.substring("resource:".length()));
73  
74          return this.parseURL(newURI.toString());
75      }
76  }
77
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