annotate src/org/tmatesoft/hg/internal/FileUtils.java @ 705:b4242b7e7dfe

Merge command: implement conflict resolution alternatives
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 15 Aug 2013 18:43:50 +0200
parents 24f4efedc9d5
children 42b88709e41d
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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.io.InputStream;
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27 import java.nio.channels.FileChannel;
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28
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29 import org.tmatesoft.hg.core.HgIOException;
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30 import org.tmatesoft.hg.util.LogFacility;
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31 import org.tmatesoft.hg.util.LogFacility.Severity;
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32
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33 /**
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34 *
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35 * @author Artem Tikhomirov
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36 * @author TMate Software Ltd.
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37 */
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38 public final class FileUtils {
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39
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40 private final LogFacility log;
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41 private final Class<?> troublemaker;
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42
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43 public static void copyFile(File from, File to) throws HgIOException {
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44 new FileUtils(new StreamLogFacility(Debug, true, System.err), FileUtils.class).copy(from, to);
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45 }
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46
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47 public FileUtils(LogFacility logFacility, Object troubleSource) {
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48 log = logFacility;
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49 if (troubleSource == null) {
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50 troublemaker = null;
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51 } else {
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52 troublemaker = troubleSource instanceof Class ? (Class<?>) troubleSource : troubleSource.getClass();
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53 }
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54 }
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55
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56 public void copy(File from, File to) throws HgIOException {
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57 FileInputStream fis = null;
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58 FileOutputStream fos = null;
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59 try {
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60 fis = new FileInputStream(from);
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61 fos = new FileOutputStream(to);
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62 FileChannel input = fis.getChannel();
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63 FileChannel output = fos.getChannel();
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64 long count = input.size();
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65 long pos = 0;
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66 int zeroCopied = 0; // flag to prevent hang-up
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67 do {
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68 long c = input.transferTo(pos, count, output);
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69 pos += c;
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70 count -= c;
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71 if (c == 0) {
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72 if (++zeroCopied == 3) {
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73 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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74 throw new IOException(m);
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75 }
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76 } else {
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77 // reset
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78 zeroCopied = 0;
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79 }
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80 } while (count > 0);
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81 fos.close();
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82 fos = null;
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83 fis.close();
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84 fis = null;
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85 } catch (IOException ex) {
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86 // not in finally because I don't want to loose exception from fos.close()
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87 closeQuietly(fis, from);
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88 closeQuietly(fos, to);
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89 String m = String.format("Failed to copy %s to %s", from.getName(), to.getName());
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90 throw new HgIOException(m, ex, from);
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91 }
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92 /* Copy of cpython's 00changelog.d, 20Mb+
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93 * Linux&Windows: 300-400 ms,
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94 * Windows uncached run: 1.6 seconds
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95 */
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96 }
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97
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98 public void write(InputStream is, File file) throws IOException {
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99 FileOutputStream fos = new FileOutputStream(file);
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100 int r;
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101 byte[] buf = new byte[8*1024];
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102 while ((r = is.read(buf)) != -1) {
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103 fos.write(buf, 0, r);
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104 }
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105 fos.flush();
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106 fos.close();
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107 }
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108
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109 public void closeQuietly(Closeable stream) {
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110 closeQuietly(stream, null);
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111 }
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112
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113 public void closeQuietly(Closeable stream, File f) {
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114 if (stream != null) {
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115 try {
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116 stream.close();
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117 } catch (IOException ex) {
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118 // ignore
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119 final String msg;
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120 if (f == null) {
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121 msg = "Exception while closing stream quietly";
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122 } else {
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123 msg = String.format("Failed to close %s", f);
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124 }
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125 log.dump(troublemaker == null ? getClass() : troublemaker, Severity.Warn, ex, msg);
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126 }
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127 }
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128 }
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129
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130 // nothing special, just a single place with common prefix
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131 public File createTempFile() throws IOException {
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132 return File.createTempFile("hg4j-", null);
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133 }
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134 }