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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.vfs.provider;
18  
19  import org.apache.commons.vfs.FileObject;
20  import org.apache.commons.vfs.FileSystemException;
21  import org.apache.commons.vfs.FileSystemOptions;
22  import org.apache.commons.vfs.FileType;
23  
24  import java.io.IOException;
25  import java.net.URL;
26  import java.net.URLConnection;
27  import java.net.URLStreamHandler;
28  
29  /***
30   * A default URL stream handler that will work for most file systems.
31   *
32   * @author <a href="mailto:brian@mmmanager.org">Brian Olsen</a>
33   * @version $Revision: 480428 $ $Date: 2006-11-29 07:15:24 +0100 (Mi, 29 Nov 2006) $
34   */
35  public class DefaultURLStreamHandler
36      extends URLStreamHandler
37  {
38      private final VfsComponentContext context;
39      private final FileSystemOptions fileSystemOptions;
40  
41      public DefaultURLStreamHandler(final VfsComponentContext context)
42      {
43          this(context, null);
44      }
45  
46      public DefaultURLStreamHandler(final VfsComponentContext context, final FileSystemOptions fileSystemOptions)
47      {
48          this.context = context;
49          this.fileSystemOptions = fileSystemOptions;
50      }
51  
52      protected URLConnection openConnection(final URL url)
53          throws IOException
54      {
55          final FileObject entry = context.resolveFile(url.toExternalForm(), fileSystemOptions);
56          return new DefaultURLConnection(url, entry.getContent());
57      }
58  
59      protected void parseURL(final URL u,
60                              final String spec,
61                              final int start,
62                              final int limit)
63      {
64          try
65          {
66              FileObject old = context.resolveFile(u.toExternalForm(), fileSystemOptions);
67  
68              FileObject newURL;
69              if (start > 0 && spec.charAt(start - 1) == ':')
70              {
71                  newURL = context.resolveFile(old, spec, fileSystemOptions);
72              }
73              else
74              {
75                  if (old.getType() == FileType.FILE && old.getParent() != null)
76                  {
77                      // for files we have to resolve relative
78                      newURL = old.getParent().resolveFile(spec);
79                  }
80                  else
81                  {
82                      newURL = old.resolveFile(spec);
83                  }
84              }
85  
86              final String url = newURL.getName().getURI();
87              final StringBuffer filePart = new StringBuffer();
88              final String protocolPart = UriParser.extractScheme(url, filePart);
89  
90              setURL(u, protocolPart, "", -1, null, null, filePart.toString(), null, null);
91          }
92          catch (FileSystemException fse)
93          {
94              // This is rethrown to MalformedURLException in URL anyway
95              throw new RuntimeException(fse.getMessage());
96          }
97      }
98  
99      protected String toExternalForm(final URL u)
100     {
101         return u.getProtocol() + ":" + u.getFile();
102     }
103 }