View Javadoc

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.impl;
18  
19  import org.apache.commons.vfs.FileContent;
20  import org.apache.commons.vfs.FileObject;
21  import org.apache.commons.vfs.FileSystemException;
22  
23  import java.util.HashMap;
24  import java.util.Map;
25  
26  /***
27   * A helper class that determines the provider to use for a file.
28   *
29   * @author <a href="mailto:adammurdoch@apache.org">Adam Murdoch</a>
30   * @version $Revision: 480428 $ $Date: 2006-11-29 07:15:24 +0100 (Mi, 29 Nov 2006) $
31   */
32  class FileTypeMap
33  {
34      private final Map mimeTypeMap = new HashMap();
35      private final Map extensionMap = new HashMap();
36  
37      /***
38       * Adds a MIME type mapping.
39       */
40      public void addMimeType(final String mimeType, final String scheme)
41      {
42          mimeTypeMap.put(mimeType, scheme);
43      }
44  
45      /***
46       * Adds a filename extension mapping.
47       */
48      public void addExtension(final String extension, final String scheme)
49      {
50          extensionMap.put(extension, scheme);
51      }
52  
53      /***
54       * Finds the provider to use to create a filesystem from a given file.
55       */
56      public String getScheme(final FileObject file) throws FileSystemException
57      {
58          // Check the file's mime type for a match
59          final FileContent content = file.getContent();
60          // final String mimeType = (String) content.getAttribute("content-type");
61          final String mimeType = content.getContentInfo().getContentType();
62          if (mimeType != null)
63          {
64              return (String) mimeTypeMap.get(mimeType);
65          }
66  
67          // Check the file's extension for a match
68          final String extension = file.getName().getExtension();
69          return (String) extensionMap.get(extension);
70      }
71  }