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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.jar;
18  
19  import org.apache.commons.vfs.Capability;
20  import org.apache.commons.vfs.FileName;
21  import org.apache.commons.vfs.FileObject;
22  import org.apache.commons.vfs.FileSystem;
23  import org.apache.commons.vfs.FileSystemException;
24  import org.apache.commons.vfs.FileSystemOptions;
25  import org.apache.commons.vfs.FileType;
26  import org.apache.commons.vfs.provider.LayeredFileName;
27  import org.apache.commons.vfs.provider.zip.ZipFileProvider;
28  
29  import java.util.ArrayList;
30  import java.util.Arrays;
31  import java.util.Collection;
32  import java.util.Collections;
33  
34  /***
35   * A file system provider for Jar files.  Provides read-only file
36   * systems.  This provides access to Jar specific features like Signing and
37   * Manifest Attributes.
38   *
39   * @author <a href="mailto:brian@mmmanager.org">Brian Olsen</a>
40   * @version $Revision: 480428 $ $Date: 2006-11-29 07:15:24 +0100 (Mi, 29 Nov 2006) $
41   */
42  public class JarFileProvider
43      extends ZipFileProvider
44  {
45      final static Collection capabilities;
46  
47      static
48      {
49          Collection combined = new ArrayList();
50          combined.addAll(ZipFileProvider.capabilities);
51          combined.addAll(Arrays.asList(new Capability[]
52              {
53                  Capability.ATTRIBUTES,
54                  Capability.FS_ATTRIBUTES,
55                  Capability.SIGNING,
56                  Capability.MANIFEST_ATTRIBUTES,
57                  Capability.VIRTUAL
58              }));
59          capabilities = Collections.unmodifiableCollection(combined);
60      }
61  
62      public JarFileProvider()
63      {
64          super();
65      }
66  
67      /***
68       * Creates a layered file system.  This method is called if the file system
69       * is not cached.
70       *
71       * @param scheme The URI scheme.
72       * @param file   The file to create the file system on top of.
73       * @return The file system.
74       */
75      protected FileSystem doCreateFileSystem(final String scheme,
76                                              final FileObject file,
77                                              final FileSystemOptions fileSystemOptions)
78          throws FileSystemException
79      {
80          final FileName name =
81              new LayeredFileName(scheme, file.getName(), FileName.ROOT_PATH, FileType.FOLDER);
82          return new JarFileSystem(name, file, fileSystemOptions);
83      }
84  
85      public Collection getCapabilities()
86      {
87          return capabilities;
88      }
89  }