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annotate src/org/tmatesoft/hg/internal/FileAnnotation.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 707b5c7c6fa4
children 6526d8adbc0f
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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ab21ac7dd833 Line-by-line annotation API and support code in place
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17 package org.tmatesoft.hg.internal;
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18
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19
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20 import org.tmatesoft.hg.core.HgCallbackTargetException;
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21 import org.tmatesoft.hg.core.HgIterateDirection;
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22 import org.tmatesoft.hg.repo.HgBlameInspector;
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23 import org.tmatesoft.hg.repo.HgBlameInspector.RevisionDescriptor;
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24 import org.tmatesoft.hg.repo.HgDataFile;
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25 import org.tmatesoft.hg.repo.HgInvalidStateException;
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26
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27 /**
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28 * Produce output like 'hg annotate' does
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29 *
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30 * @author Artem Tikhomirov
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31 * @author TMate Software Ltd.
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32 */
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33 public class FileAnnotation implements HgBlameInspector, RevisionDescriptor.Recipient {
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34
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35 @Experimental(reason="The line-by-line inspector likely to become part of core/command API")
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36 @Callback
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37 public interface LineInspector {
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38 /**
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39 * Not necessarily invoked sequentially by line numbers
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40 */
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41 void line(int lineNumber, int changesetRevIndex, BlockData lineContent, LineDescriptor ld);
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42 }
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43
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44 public interface LineDescriptor {
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45 int totalLines();
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46 }
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47
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48 /**
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49 * Annotate file revision, line by line.
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50 */
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51 public static void annotate(HgDataFile df, int changelogRevisionIndex, LineInspector insp) throws HgCallbackTargetException {
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52 if (!df.exists()) {
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53 return;
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54 }
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55 FileAnnotation fa = new FileAnnotation(insp);
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56 df.annotate(changelogRevisionIndex, fa, HgIterateDirection.NewToOld);
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57 }
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58
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59 // keeps <startSeq1, startSeq2, len> of equal blocks, origin to target, from some previous step
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60 private RangeSeq activeEquals;
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61 // equal blocks of the current iteration, to be recalculated before next step
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62 // to track line number (current target to ultimate target) mapping
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63 private RangeSeq intermediateEquals = new RangeSeq();
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64
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65 private boolean[] knownLines;
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66 private final LineInspector delegate;
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67 private RevisionDescriptor revisionDescriptor;
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68 private BlockData lineContent;
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69
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70 private IntMap<RangeSeq> mergedRanges = new IntMap<RangeSeq>(10);
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71 private IntMap<RangeSeq> equalRanges = new IntMap<RangeSeq>(10);
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72 private boolean activeEqualsComesFromMerge = false;
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73
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74 public FileAnnotation(LineInspector lineInspector) {
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75 delegate = lineInspector;
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76 }
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77
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78 public void start(RevisionDescriptor rd) {
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79 revisionDescriptor = rd;
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80 if (knownLines == null) {
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81 lineContent = rd.target();
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82 knownLines = new boolean[lineContent.elementCount()];
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83 activeEquals = new RangeSeq();
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84 activeEquals.add(0, 0, knownLines.length);
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85 equalRanges.put(rd.targetChangesetIndex(), activeEquals);
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86 } else {
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87 activeEquals = equalRanges.get(rd.targetChangesetIndex());
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88 if (activeEquals == null) {
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89 // we didn't see this target revision as origin yet
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90 // the only way this may happen is that this revision was a merge parent
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91 activeEquals = mergedRanges.get(rd.targetChangesetIndex());
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92 activeEqualsComesFromMerge = true;
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93 if (activeEquals == null) {
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94 throw new HgInvalidStateException(String.format("Can't find previously visited revision %d (while in %d->%1$d diff)", rd.targetChangesetIndex(), rd.originChangesetIndex()));
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95 }
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96 }
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97 }
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98 }
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99
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100 public void done(RevisionDescriptor rd) {
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101 // update line numbers of the intermediate target to point to ultimate target's line numbers
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102 RangeSeq v = intermediateEquals.intersect(activeEquals);
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103 if (activeEqualsComesFromMerge) {
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104 mergedRanges.put(rd.originChangesetIndex(), v);
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105 } else {
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106 equalRanges.put(rd.originChangesetIndex(), v);
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107 }
560
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108 if (rd.isMerge() && !mergedRanges.containsKey(rd.mergeChangesetIndex())) {
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109 // seen merge, but no lines were merged from p2.
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110 // Add empty range to avoid uncertainty when a parent of p2 pops in
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111 mergedRanges.put(rd.mergeChangesetIndex(), new RangeSeq());
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112 }
557
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113 intermediateEquals.clear();
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114 activeEquals = null;
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115 activeEqualsComesFromMerge = false;
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116 revisionDescriptor = null;
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117 }
555
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118
557
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119 public void same(EqualBlock block) {
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120 intermediateEquals.add(block.originStart(), block.targetStart(), block.length());
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121 }
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122
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123 public void added(AddBlock block) {
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124 RangeSeq rs = null;
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125 if (revisionDescriptor.isMerge() && block.originChangesetIndex() == revisionDescriptor.mergeChangesetIndex()) {
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126 rs = mergedRanges.get(revisionDescriptor.mergeChangesetIndex());
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127 if (rs == null) {
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128 mergedRanges.put(revisionDescriptor.mergeChangesetIndex(), rs = new RangeSeq());
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129 }
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130 }
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131 if (activeEquals.size() == 0) {
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132 return;
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133 }
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134 for (int i = 0, ln = block.firstAddedLine(), x = block.totalAddedLines(); i < x; i++, ln++) {
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135 int lnInFinal = activeEquals.mapLineIndex(ln);
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136 if (lnInFinal != -1/* && !knownLines[lnInFinal]*/) {
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137 if (rs != null) {
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138 rs.add(block.insertedAt() + i, lnInFinal, 1);
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139 } else {
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140 delegate.line(lnInFinal, block.targetChangesetIndex(), lineContent.elementAt(lnInFinal), new LineDescriptorImpl());
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141 }
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142 knownLines[lnInFinal] = true;
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143 }
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144 }
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145 }
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146
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147 public void changed(ChangeBlock block) {
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148 added(block);
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149 }
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150
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151 public void deleted(DeleteBlock block) {
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152 }
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153
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154 private final class LineDescriptorImpl implements LineDescriptor {
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155 LineDescriptorImpl() {
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156 }
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157
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158 public int totalLines() {
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159 return FileAnnotation.this.knownLines.length;
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160 }
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161 }
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162 }