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annotate src/org/tmatesoft/hg/internal/FileUtils.java @ 678:8625cba0a5a8

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Towards better blame of merge revisions: refactor merge handling strategy
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 19 Jul 2013 15:36:29 +0200
parents 12a4f60ea972
children 24f4efedc9d5
rev   line source
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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 public final class FileUtils {
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38
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39 private final LogFacility log;
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40 private final Class<?> troublemaker;
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41
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42 public static void copyFile(File from, File to) throws HgIOException {
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43 new FileUtils(new StreamLogFacility(Debug, true, System.err), FileUtils.class).copy(from, to);
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44 }
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45
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46 public FileUtils(LogFacility logFacility, Object troubleSource) {
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47 log = logFacility;
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48 if (troubleSource == null) {
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49 troublemaker = null;
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50 } else {
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51 troublemaker = troubleSource instanceof Class ? (Class<?>) troubleSource : troubleSource.getClass();
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52 }
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53 }
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54
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55 public void copy(File from, File to) throws HgIOException {
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56 FileInputStream fis = null;
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57 FileOutputStream fos = null;
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58 try {
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59 fis = new FileInputStream(from);
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60 fos = new FileOutputStream(to);
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61 FileChannel input = fis.getChannel();
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62 FileChannel output = fos.getChannel();
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63 long count = input.size();
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64 long pos = 0;
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65 int zeroCopied = 0; // flag to prevent hang-up
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66 do {
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67 long c = input.transferTo(pos, count, output);
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68 pos += c;
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69 count -= c;
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70 if (c == 0) {
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71 if (++zeroCopied == 3) {
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72 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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73 throw new IOException(m);
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74 }
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75 } else {
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76 // reset
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77 zeroCopied = 0;
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78 }
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79 } while (count > 0);
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80 fos.close();
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81 fos = null;
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82 fis.close();
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83 fis = null;
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84 } catch (IOException ex) {
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85 // not in finally because I don't want to loose exception from fos.close()
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86 closeQuietly(fis, from);
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87 closeQuietly(fos, to);
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88 String m = String.format("Failed to copy %s to %s", from.getName(), to.getName());
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89 throw new HgIOException(m, ex, from);
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90 }
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91 /* Copy of cpython's 00changelog.d, 20Mb+
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92 * Linux&Windows: 300-400 ms,
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93 * Windows uncached run: 1.6 seconds
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94 */
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95 }
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96
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97 public void closeQuietly(Closeable stream) {
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98 closeQuietly(stream, null);
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99 }
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100
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101 public void closeQuietly(Closeable stream, File f) {
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102 if (stream != null) {
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103 try {
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104 stream.close();
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105 } catch (IOException ex) {
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106 // ignore
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107 final String msg;
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108 if (f == null) {
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109 msg = "Exception while closing stream quietly";
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110 } else {
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111 msg = String.format("Failed to close %s", f);
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112 }
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113 log.dump(troublemaker == null ? getClass() : troublemaker, Severity.Warn, ex, msg);
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114 }
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115 }
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116 }
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117 }