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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  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  package org.apache.commons.scxml.env;
18  
19  import java.io.Serializable;
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, Serializable {
33  
34      /*** Serial version UID. */
35      private static final long serialVersionUID = 1L;
36  
37      /*** Implementation independent log category. */
38      private Log log = LogFactory.getLog(PathResolver.class);
39  
40      /*** The base URL to resolve against. */
41      private URL baseURL = null;
42  
43      /***
44       * Constructor.
45       *
46       * @param baseURL The base URL to resolve against
47       */
48      public URLResolver(final URL baseURL) {
49          this.baseURL = baseURL;
50      }
51  
52      /***
53       * Uses URL(URL, String) constructor to combine URL's.
54       * @see org.apache.commons.scxml.PathResolver#resolvePath(java.lang.String)
55       */
56      public String resolvePath(final String ctxPath) {
57          URL combined;
58          try {
59              combined = new URL(baseURL, ctxPath);
60              return combined.toString();
61          } catch (MalformedURLException e) {
62              log.error("Malformed URL", e);
63          }
64          return null;
65      }
66  
67      /***
68       * @see org.apache.commons.scxml.PathResolver#getResolver(java.lang.String)
69       */
70      public PathResolver getResolver(final String ctxPath) {
71          URL combined;
72          try {
73              combined = new URL(baseURL, ctxPath);
74              return new URLResolver(combined);
75          } catch (MalformedURLException e) {
76              log.error("Malformed URL", e);
77          }
78          return null;
79      }
80  
81  }
82