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1   /*
2    *
3    *   Copyright 2005-2006 The Apache Software Foundation.
4    *
5    *  Licensed under the Apache License, Version 2.0 (the "License");
6    *  you may not use this file except in compliance with the License.
7    *  You may obtain a copy of the License at
8    *
9    *      http://www.apache.org/licenses/LICENSE-2.0
10   *
11   *  Unless required by applicable law or agreed to in writing, software
12   *  distributed under the License is distributed on an "AS IS" BASIS,
13   *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   *  See the License for the specific language governing permissions and
15   *  limitations under the License.
16   *
17   */
18  package org.apache.commons.scxml.env;
19  
20  import java.net.MalformedURLException;
21  import java.net.URL;
22  
23  import org.apache.commons.logging.Log;
24  import org.apache.commons.logging.LogFactory;
25  import org.apache.commons.scxml.PathResolver;
26  
27  /***
28   * A PathResolver implementation that resolves against a base URL.
29   *
30   * @see org.apache.commons.scxml.PathResolver
31   */
32  public class URLResolver implements PathResolver {
33  
34      /*** Implementation independent log category. */
35      private Log log = LogFactory.getLog(PathResolver.class);
36  
37      /*** The base URL to resolve against. */
38      private URL baseURL = null;
39  
40      /***
41       * Constructor.
42       *
43       * @param baseURL The base URL to resolve against
44       */
45      public URLResolver(final URL baseURL) {
46          this.baseURL = baseURL;
47      }
48  
49      /***
50       * Uses URL(URL, String) constructor to combine URL's.
51       * @see org.apache.commons.scxml.PathResolver#resolvePath(java.lang.String)
52       */
53      public String resolvePath(final String ctxPath) {
54          URL combined;
55          try {
56              combined = new URL(baseURL, ctxPath);
57              return combined.toString();
58          } catch (MalformedURLException e) {
59              log.error("Malformed URL", e);
60          }
61          return null;
62      }
63  
64      /***
65       * @see org.apache.commons.scxml.PathResolver#getResolver(java.lang.String)
66       */
67      public PathResolver getResolver(final String ctxPath) {
68          URL combined;
69          try {
70              combined = new URL(baseURL, ctxPath);
71              return new URLResolver(combined);
72          } catch (MalformedURLException e) {
73              log.error("Malformed URL", e);
74          }
75          return null;
76      }
77  
78  }
79