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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  }