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annotate src/org/tmatesoft/hg/repo/ext/Rebase.java @ 606:5daa42067e7c

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Avoid mmap files when only few bytes are to be read
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 07 May 2013 14:16:35 +0200
parents d2f6ab541330
children 6526d8adbc0f
rev   line source
501
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1 /*
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2 * Copyright (c) 2012 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.repo.ext;
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18
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19 import java.io.File;
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20 import java.util.ArrayList;
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21 import java.util.HashMap;
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22 import java.util.Iterator;
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23 import java.util.Map;
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24 import java.util.NoSuchElementException;
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25
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26 import org.tmatesoft.hg.core.HgBadNodeidFormatException;
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27 import org.tmatesoft.hg.core.HgIOException;
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28 import org.tmatesoft.hg.core.Nodeid;
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29 import org.tmatesoft.hg.internal.Internals;
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30 import org.tmatesoft.hg.internal.LineReader;
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31 import org.tmatesoft.hg.repo.HgInvalidFileException;
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32 import org.tmatesoft.hg.repo.HgInvalidStateException;
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33
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34 /**
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35 * Support for standard Rebase extension.
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36 *
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37 * @see http://mercurial.selenic.com/wiki/RebaseExtension
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38 * @since 1.1
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39 * @author Artem Tikhomirov
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40 * @author TMate Software Ltd.
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41 */
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42 public class Rebase {
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43 private Internals repo;
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44 private Nodeid workingDirParent;
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45 private Nodeid destRevision;
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46 private Nodeid externalParent;
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47 private Map<Nodeid, Nodeid> state;
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48 private boolean collapse;
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49 private boolean keepOriginalRevisions;
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50 private boolean keepBranchNames;
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51
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52 /*package-local*/ Rebase(Internals internalRepo) {
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53 repo = internalRepo;
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54 }
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55
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56 public Rebase refresh() throws HgIOException {
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57 workingDirParent = null;
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58 destRevision = null;
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59 externalParent = null;
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60 state = null;
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61 File f = repo.getFileFromRepoDir("rebasestate");
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62 if (!f.exists()) {
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63 return this;
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64 }
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65 state = new HashMap<Nodeid, Nodeid>();
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66 try {
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67 LineReader lr = new LineReader(f, repo.getSessionContext().getLog());
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68 ArrayList<String> contents = new ArrayList<String>();
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69 lr.read(new LineReader.SimpleLineCollector(), contents);
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70 Iterator<String> it = contents.iterator();
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71 workingDirParent = Nodeid.fromAscii(it.next());
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72 destRevision = Nodeid.fromAscii(it.next());
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73 externalParent = Nodeid.fromAscii(it.next());
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74 collapse = "1".equals(it.next());
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75 keepOriginalRevisions = "1".equals(it.next());
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76 keepBranchNames = "1".equals(it.next());
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77 final String nullmerge = "-2";
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78 while (it.hasNext()) {
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79 String line = it.next();
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80 int x = line.indexOf(':');
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81 if (x == -1) {
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82 throw new HgInvalidStateException(line);
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83 }
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84 Nodeid oldRev = Nodeid.fromAscii(line.substring(0, x));
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85 Nodeid newRev;
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86 if (line.regionMatches(x+1, nullmerge, 0, nullmerge.length())) {
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87 newRev = null;
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88 } else {
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89 newRev = Nodeid.fromAscii(line.substring(x+1));
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90 }
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91 state.put(oldRev, newRev);
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92 }
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93 } catch (NoSuchElementException ex) {
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94 throw new HgIOException("Bad format of rebase state file", f);
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95 } catch (HgBadNodeidFormatException ex) {
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96 throw new HgIOException("Bad format of rebase state file", ex, f);
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97 } catch (HgInvalidFileException ex) {
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98 throw new HgIOException("Bad format of rebase state file", ex, f);
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99 }
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100 return this;
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101 }
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102
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103 /**
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104 * Tells whether rebase process was interrupted to manually resolve a merge
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105 * and can be resumed or aborted.
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106 *
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107 * @return <code>true</code> when rebase is in progress
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108 */
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109 public boolean isRebaseInProgress() {
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110 return state != null;
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111 }
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112
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113 public Nodeid getWorkingDirParent() {
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114 assert isRebaseInProgress();
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115 return workingDirParent;
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116 }
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117
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118 public Nodeid getTarget() {
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119 assert isRebaseInProgress();
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120 return destRevision;
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121 }
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122
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123 public Nodeid getExternalParent() {
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124 assert isRebaseInProgress();
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125 assert collapse;
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126 return externalParent;
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127 }
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128
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129 public boolean isCollapse() {
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130 return collapse;
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131 }
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132
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133 public boolean isKeepOriginalRevisions() {
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134 return keepOriginalRevisions;
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135 }
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136
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137 public boolean isKeepBranchNames() {
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138 return keepBranchNames;
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139 }
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140 }