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comparison src/org/tmatesoft/hg/internal/FileContentSupplier.java @ 586:73c20c648c1f

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HgCommitCommand initial support
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 26 Apr 2013 18:38:41 +0200
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children e447384f3771
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585:b47ef0d2777b 586:73c20c648c1f
1 /*
2 * Copyright (c) 2013 TMate Software Ltd
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; version 2 of the License.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * For information on how to redistribute this software under
14 * the terms of a license other than GNU General Public License
15 * contact TMate Software at support@hg4j.com
16 */
17 package org.tmatesoft.hg.internal;
18
19 import java.io.File;
20 import java.io.FileInputStream;
21 import java.io.FileNotFoundException;
22 import java.io.IOException;
23 import java.nio.ByteBuffer;
24 import java.nio.channels.FileChannel;
25
26 import org.tmatesoft.hg.core.HgIOException;
27 import org.tmatesoft.hg.repo.CommitFacility;
28 import org.tmatesoft.hg.repo.HgRepository;
29 import org.tmatesoft.hg.util.Path;
30
31 /**
32 * FIXME files are opened at the moment of instantiation, though the moment the data is requested might be distant
33 *
34 * @author Artem Tikhomirov
35 * @author TMate Software Ltd.
36 */
37 public class FileContentSupplier implements CommitFacility.ByteDataSupplier {
38 private final FileChannel channel;
39 private IOException error;
40
41 public FileContentSupplier(HgRepository repo, Path file) throws HgIOException {
42 this(new File(repo.getWorkingDir(), file.toString()));
43 }
44
45 public FileContentSupplier(File f) throws HgIOException {
46 if (!f.canRead()) {
47 throw new HgIOException(String.format("Can't read file %s", f), f);
48 }
49 try {
50 channel = new FileInputStream(f).getChannel();
51 } catch (FileNotFoundException ex) {
52 throw new HgIOException("Can't open file", ex, f);
53 }
54 }
55
56 public int read(ByteBuffer buf) {
57 if (error != null) {
58 return -1;
59 }
60 try {
61 return channel.read(buf);
62 } catch (IOException ex) {
63 error = ex;
64 }
65 return -1;
66 }
67
68 public void done() throws IOException {
69 channel.close();
70 if (error != null) {
71 throw error;
72 }
73 }
74 }