Mercurial > hg4j
annotate src/org/tmatesoft/hg/internal/FileUtils.java @ 658:d10399f80f4e
javac complained about casts, while eclipse compiler is fine
author | Artem Tikhomirov <tikhomirov.artem@gmail.com> |
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date | Thu, 04 Jul 2013 21:09:33 +0200 |
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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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parents:
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116 } |
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117 } |