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Java > Open Source Codes > com > imagero > uio > io > RandomAccessOutputStream


1 /*
2  * Copyright (c) Andrey Kuznetsov. All Rights Reserved.
3  *
4  * http://uio.imagero.com
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions are met:
8  *
9  * o Redistributions of source code must retain the above copyright notice,
10  * this list of conditions and the following disclaimer.
11  *
12  * o Redistributions in binary form must reproduce the above copyright notice,
13  * this list of conditions and the following disclaimer in the documentation
14  * and/or other materials provided with the distribution.
15  *
16  * o Neither the name of imagero Andrei Kouznetsov nor the names of
17  * its contributors may be used to endorse or promote products derived
18  * from this software without specific prior written permission.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
21  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
22  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
24  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
25  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
26  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
27  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
28  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
29  * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
30  * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31  */
32 package com.imagero.uio.io;
33
34 import com.imagero.uio.RandomAccess;
35
36 import java.io.IOException JavaDoc;
37 import java.io.OutputStream JavaDoc;
38
39 /**
40  * RandomAccessOutputStream.java
41  * Can be used as bridge between RandomAccessFile and OutputStream.
42  * @author Andrey Kuznetsov
43  */
44 public class RandomAccessOutputStream extends OutputStream JavaDoc {
45
46     protected RandomAccess ra;
47     protected long pos;
48
49     public RandomAccessOutputStream(RandomAccess ra) {
50         this(ra, 0L);
51     }
52
53     public RandomAccessOutputStream(RandomAccess ra, long startPos) {
54         this.ra = ra;
55         this.pos = startPos;
56     }
57
58     protected void checkPos() throws IOException JavaDoc {
59         long fp = ra.getFilePointer();
60         if (fp != pos) {
61             ra.seek(pos);
62         }
63     }
64
65     public void write(int b) throws IOException JavaDoc {
66         checkPos();
67         writeImpl(b);
68         pos++;
69     }
70
71     private void writeImpl(int b) throws IOException JavaDoc {
72         ra.write(b);
73     }
74
75     public void write(byte b[]) throws IOException JavaDoc {
76         write(b, 0, b.length);
77     }
78
79     public void write(byte b[], int off, int len) throws IOException JavaDoc {
80         checkPos();
81         ra.write(b, off, len);
82         pos += len;
83     }
84
85     public void close() throws IOException JavaDoc {
86         ra = null;
87     }
88 }
89
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