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annotate src/org/tmatesoft/hg/internal/FileUtils.java @ 617:65c01508f002

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Rollback support for commands that modify repository. Strategy to keep complete copy of a file being changed
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 15 May 2013 20:10:09 +0200
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children 7c0d2ce340b8
rev   line source
617
65c01508f002 Rollback support for commands that modify repository. Strategy to keep complete copy of a file being changed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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1 /*
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2 * Copyright (c) 2013 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
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15 * contact TMate Software at support@hg4j.com
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16 */
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17 package org.tmatesoft.hg.internal;
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18
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19 import static org.tmatesoft.hg.util.LogFacility.Severity.Debug;
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20
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21 import java.io.Closeable;
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22 import java.io.File;
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23 import java.io.FileInputStream;
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24 import java.io.FileOutputStream;
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25 import java.io.IOException;
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26 import java.nio.channels.FileChannel;
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27
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28 import org.tmatesoft.hg.core.HgIOException;
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29 import org.tmatesoft.hg.util.LogFacility;
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30 import org.tmatesoft.hg.util.LogFacility.Severity;
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31
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32 /**
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33 *
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34 * @author Artem Tikhomirov
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35 * @author TMate Software Ltd.
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36 */
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37 final class FileUtils {
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38
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39 private final LogFacility log;
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40
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41 public static void copyFile(File from, File to) throws HgIOException {
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42 new FileUtils(new StreamLogFacility(Debug, true, System.err)).copy(from, to);
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43 }
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44
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45 public FileUtils(LogFacility logFacility) {
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46 log = logFacility;
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47 }
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48
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49 public void copy(File from, File to) throws HgIOException {
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50 FileInputStream fis = null;
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51 FileOutputStream fos = null;
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52 try {
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53 fis = new FileInputStream(from);
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54 fos = new FileOutputStream(to);
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55 FileChannel input = fis.getChannel();
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56 FileChannel output = fos.getChannel();
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57 long count = input.size();
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58 long pos = 0;
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59 int zeroCopied = 0; // flag to prevent hang-up
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60 do {
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61 long c = input.transferTo(pos, count, output);
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62 pos += c;
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63 count -= c;
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64 if (c == 0) {
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65 if (++zeroCopied == 3) {
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66 String m = String.format("Can't copy %s to %s, transferTo copies 0 bytes. Position: %d, bytes left:%d", from.getName(), to.getName(), pos, count);
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67 throw new IOException(m);
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68 }
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69 } else {
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70 // reset
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71 zeroCopied = 0;
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72 }
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73 } while (count > 0);
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74 fos.close();
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75 fos = null;
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76 fis.close();
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77 fis = null;
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78 } catch (IOException ex) {
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79 // not in finally because I don't want to loose exception from fos.close()
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80 closeQuietly(fis);
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81 closeQuietly(fos);
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82 String m = String.format("Failed to copy %s to %s", from.getName(), to.getName());
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83 throw new HgIOException(m, ex, from);
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84 }
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85 }
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86
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87 public void closeQuietly(Closeable stream) {
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88 if (stream != null) {
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89 try {
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90 stream.close();
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91 } catch (IOException ex) {
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92 // ignore
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93 log.dump(getClass(), Severity.Warn, ex, "Exception while closing stream quietly");
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94 }
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95 }
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96 }
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97
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98 }