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annotate src/org/tmatesoft/hg/internal/FileUtils.java @ 709:497e697636fc

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Report merged lines as changed block if possible, not as a sequence of added/deleted blocks. To facilitate access to merge parent lines AddBlock got mergeLineAt() method that reports index of the line in the second parent (if any), while insertedAt() has been changed to report index in the first parent always
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 21 Aug 2013 16:23:27 +0200
parents 42b88709e41d
children
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.io.InputStream;
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27 import java.nio.channels.FileChannel;
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28 import java.util.Arrays;
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29 import java.util.LinkedList;
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30 import java.util.List;
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31
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32 import org.tmatesoft.hg.core.HgIOException;
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33 import org.tmatesoft.hg.util.LogFacility;
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34 import org.tmatesoft.hg.util.LogFacility.Severity;
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35
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36 /**
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37 *
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38 * @author Artem Tikhomirov
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39 * @author TMate Software Ltd.
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40 */
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41 public final class FileUtils {
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42
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43 private final LogFacility log;
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44 private final Class<?> troublemaker;
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45
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46 public static void copyFile(File from, File to) throws HgIOException {
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47 new FileUtils(new StreamLogFacility(Debug, true, System.err), FileUtils.class).copy(from, to);
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48 }
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49
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50 public FileUtils(LogFacility logFacility, Object troubleSource) {
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51 log = logFacility;
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52 if (troubleSource == null) {
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53 troublemaker = null;
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54 } else {
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55 troublemaker = troubleSource instanceof Class ? (Class<?>) troubleSource : troubleSource.getClass();
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56 }
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57 }
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58
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59 public void copy(File from, File to) throws HgIOException {
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60 FileInputStream fis = null;
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61 FileOutputStream fos = null;
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62 try {
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63 fis = new FileInputStream(from);
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64 fos = new FileOutputStream(to);
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65 FileChannel input = fis.getChannel();
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66 FileChannel output = fos.getChannel();
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67 long count = input.size();
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68 long pos = 0;
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69 int zeroCopied = 0; // flag to prevent hang-up
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70 do {
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71 long c = input.transferTo(pos, count, output);
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72 pos += c;
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73 count -= c;
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74 if (c == 0) {
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75 if (++zeroCopied == 3) {
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76 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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77 throw new IOException(m);
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78 }
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79 } else {
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80 // reset
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81 zeroCopied = 0;
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82 }
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83 } while (count > 0);
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84 fos.close();
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85 fos = null;
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86 fis.close();
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87 fis = null;
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88 } catch (IOException ex) {
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89 // not in finally because I don't want to loose exception from fos.close()
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90 closeQuietly(fis, from);
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91 closeQuietly(fos, to);
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92 String m = String.format("Failed to copy %s to %s", from.getName(), to.getName());
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93 throw new HgIOException(m, ex, from);
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94 }
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95 /* Copy of cpython's 00changelog.d, 20Mb+
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96 * Linux&Windows: 300-400 ms,
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97 * Windows uncached run: 1.6 seconds
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98 */
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99 }
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100
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101 public void write(InputStream is, File file) throws IOException {
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102 FileOutputStream fos = new FileOutputStream(file);
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103 int r;
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104 byte[] buf = new byte[8*1024];
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105 while ((r = is.read(buf)) != -1) {
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106 fos.write(buf, 0, r);
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107 }
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108 fos.flush();
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109 fos.close();
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110 }
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111
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112 public void closeQuietly(Closeable stream) {
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113 closeQuietly(stream, null);
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114 }
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115
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116 public void closeQuietly(Closeable stream, File f) {
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117 if (stream != null) {
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118 try {
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119 stream.close();
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120 } catch (IOException ex) {
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121 // ignore
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122 final String msg;
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123 if (f == null) {
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124 msg = "Exception while closing stream quietly";
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125 } else {
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126 msg = String.format("Failed to close %s", f);
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127 }
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128 log.dump(troublemaker == null ? getClass() : troublemaker, Severity.Warn, ex, msg);
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129 }
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130 }
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131 }
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132
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133 // nothing special, just a single place with common prefix
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134 public static File createTempFile() throws IOException {
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135 return File.createTempFile("hg4j-", null);
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136 }
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137
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138 public static void rmdir(File dest) throws IOException {
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139 if (!dest.isDirectory()) {
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140 return;
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141 }
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142 LinkedList<File> queue = new LinkedList<File>();
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143 queue.addAll(Arrays.asList(dest.listFiles()));
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144 while (!queue.isEmpty()) {
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145 File next = queue.removeFirst();
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146 if (next.isDirectory()) {
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147 List<File> files = Arrays.asList(next.listFiles());
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148 if (!files.isEmpty()) {
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149 queue.addAll(files);
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150 queue.add(next);
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151 }
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152 // fall through
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153 }
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154 next.delete();
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155 }
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156 dest.delete();
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157 }
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158
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159 }