SeekableOutputStream


1   /*
2   
3      Copyright 2001  The Apache Software Foundation 
4   
5      Licensed under the Apache License, Version 2.0 (the "License");
6      you may not use this file except in compliance with the License.
7      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   */
18  package org.apache.batik.ext.awt.image.codec;
19  
20  import java.io.IOException  ;
21  import java.io.OutputStream  ;
22  import java.io.RandomAccessFile  ;
23  
24  /**
25   * An <code>OutputStream</code> which can seek to an arbitrary offset.
26   */
27  public class SeekableOutputStream extends OutputStream   {
28  
29      private RandomAccessFile   file;
30  
31      /**
32       * Constructs a <code>SeekableOutputStream</code> from a
33       * <code>RandomAccessFile</code>.  Unless otherwise indicated,
34       * all method invocations are fowarded to the underlying
35       * <code>RandomAccessFile</code>.
36       *
37       * @param file The <code>RandomAccessFile</code> to which calls
38       *             will be forwarded.
39       * @exception IllegalArgumentException if <code>file</code> is
40       *            <code>null</code>.
41       */
42      public SeekableOutputStream(RandomAccessFile   file) {
43          if(file == null) {
44              throw new IllegalArgumentException  ("SeekableOutputStream0");
45          }
46          this.file = file;
47      }
48  
49      public void write(int b) throws IOException   {
50          file.write(b);
51      }
52  
53      public void write(byte b[]) throws IOException   {
54          file.write(b);
55      }
56  
57      public void write(byte b[], int off, int len) throws IOException   {
58          file.write(b, off, len);
59      }
60  
61      /**
62       * Invokes <code>getFD().sync()</code> on the underlying
63       * <code>RandomAccessFile</code>.
64       */
65      public void flush() throws IOException   {
66          file.getFD().sync();
67      }
68  
69      public void close() throws IOException   {
70          file.close();
71      }
72  
73      public long getFilePointer() throws IOException   {
74          return file.getFilePointer();
75      }
76  
77      public void seek(long pos) throws IOException   {
78          file.seek(pos);
79      }
80  }
81
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