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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.vfs2.provider.gzip;
18  
19  import java.io.InputStream;
20  import java.io.OutputStream;
21  import java.util.zip.GZIPInputStream;
22  import java.util.zip.GZIPOutputStream;
23  
24  import org.apache.commons.vfs2.FileObject;
25  import org.apache.commons.vfs2.provider.AbstractFileName;
26  import org.apache.commons.vfs2.provider.compressed.CompressedFileFileObject;
27  import org.apache.commons.vfs2.provider.compressed.CompressedFileFileSystem;
28  
29  /**
30   * the gzip file.
31   */
32  public class GzipFileObject extends CompressedFileFileObject<GzipFileSystem>
33  {
34      /**
35       * Deprecated since 2.1. 
36       * 
37       * @deprecated Use {@link #GzipFileObject(AbstractFileName, FileObject, GzipFileSystem)} instead.
38       */
39      @Deprecated
40      protected GzipFileObject(final AbstractFileName name, final FileObject container, final CompressedFileFileSystem fs) {
41          super(name, container, cast(fs));
42      }
43  
44      protected GzipFileObject(final AbstractFileName name, final FileObject container, final GzipFileSystem fs)
45      {
46          super(name, container, fs);
47      }
48  
49      @Override
50      protected InputStream doGetInputStream() throws Exception
51      {
52          final InputStream is = getContainer().getContent().getInputStream();
53          return new GZIPInputStream(is);
54      }
55  
56      @Override
57      protected OutputStream doGetOutputStream(final boolean bAppend) throws Exception
58      {
59          final OutputStream os = getContainer().getContent().getOutputStream(false);
60          return new GZIPOutputStream(os);
61      }
62  
63      private static GzipFileSystem cast(CompressedFileFileSystem fs) {
64          if (fs instanceof GzipFileSystem) {
65              return (GzipFileSystem) fs;
66          }
67          throw new IllegalArgumentException("GzipFileObject expects an instance of GzipFileSystem");
68      }
69  }