1 /* CompositeFileInputStream
2 *
3 * $Id: CompositeFileInputStream.java 4647 2006-09-22 18:39:39Z paul_jack $
4 *
5 * Created on May 18, 2004
6 *
7 * Copyright (C) 2004 Internet Archive.
8 *
9 * This file is part of the Heritrix web crawler (crawler.archive.org).
10 *
11 * Heritrix is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU Lesser Public License as published by
13 * the Free Software Foundation; either version 2.1 of the License, or
14 * any later version.
15 *
16 * Heritrix is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU Lesser Public License for more details.
20 *
21 * You should have received a copy of the GNU Lesser Public License
22 * along with Heritrix; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 */
25 package org.archive.io;
26
27 import java.io.File;
28 import java.io.FileInputStream;
29 import java.io.FilterInputStream;
30 import java.io.IOException;
31 import java.util.Iterator;
32 import java.util.List;
33
34
35 /***
36 * @author gojomo
37 */
38 public class CompositeFileInputStream extends FilterInputStream{
39 Iterator<File> filenames;
40
41 /* (non-Javadoc)
42 * @see java.io.InputStream#read()
43 */
44 public int read() throws IOException {
45 int c = super.read();
46 if( c == -1 && filenames.hasNext() ) {
47 cueStream();
48 return read();
49 }
50 return c;
51 }
52 /* (non-Javadoc)
53 * @see java.io.InputStream#read(byte[], int, int)
54 */
55 public int read(byte[] b, int off, int len) throws IOException {
56 int c = super.read(b, off, len);
57 if( c == -1 && filenames.hasNext() ) {
58 cueStream();
59 return read(b,off,len);
60 }
61 return c;
62 }
63 /* (non-Javadoc)
64 * @see java.io.InputStream#read(byte[])
65 */
66 public int read(byte[] b) throws IOException {
67 int c = super.read(b);
68 if( c == -1 && filenames.hasNext() ) {
69 cueStream();
70 return read(b);
71 }
72 return c;
73 }
74
75 /* (non-Javadoc)
76 * @see java.io.InputStream#skip(long)
77 */
78 public long skip(long n) throws IOException {
79 long s = super.skip(n);
80 if( s<n && filenames.hasNext() ) {
81 cueStream();
82 return s + skip(n-s);
83 }
84 return s;
85 }
86
87 /***
88 * @param files
89 * @throws IOException
90 */
91 public CompositeFileInputStream(List<File> files) throws IOException {
92 super(null);
93 filenames = files.iterator();
94 cueStream();
95 }
96
97 private void cueStream() throws IOException {
98 if(filenames.hasNext()) {
99 this.in = new FileInputStream(filenames.next());
100 }
101 }
102
103 }