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annotate src/org/tmatesoft/hg/internal/FileAnnotation.java @ 599:55b7987c1796

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Do not instantiate intermediate arrays
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 03 May 2013 15:29:26 +0200
parents 8ed4f4f4f0a6
children 707b5c7c6fa4
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
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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.HgBlameFacility;
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23 import org.tmatesoft.hg.repo.HgInvalidStateException;
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24 import org.tmatesoft.hg.repo.HgBlameFacility.AddBlock;
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25 import org.tmatesoft.hg.repo.HgBlameFacility.BlockData;
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26 import org.tmatesoft.hg.repo.HgBlameFacility.ChangeBlock;
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27 import org.tmatesoft.hg.repo.HgBlameFacility.DeleteBlock;
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28 import org.tmatesoft.hg.repo.HgBlameFacility.EqualBlock;
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29 import org.tmatesoft.hg.repo.HgBlameFacility.RevisionDescriptor;
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30 import org.tmatesoft.hg.repo.HgDataFile;
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31
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32 /**
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33 * Produce output like 'hg annotate' does
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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 class FileAnnotation implements HgBlameFacility.Inspector, RevisionDescriptor.Recipient {
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39
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40 @Experimental(reason="The line-by-line inspector likely to become part of core/command API")
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41 @Callback
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42 public interface LineInspector {
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43 /**
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44 * Not necessarily invoked sequentially by line numbers
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45 */
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46 void line(int lineNumber, int changesetRevIndex, BlockData lineContent, LineDescriptor ld);
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47 }
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48
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49 public interface LineDescriptor {
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50 int totalLines();
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51 }
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52
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53 /**
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54 * Annotate file revision, line by line.
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55 */
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56 public static void annotate(HgDataFile df, int changelogRevisionIndex, LineInspector insp) throws HgCallbackTargetException {
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57 if (!df.exists()) {
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58 return;
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59 }
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60 FileAnnotation fa = new FileAnnotation(insp);
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61 HgBlameFacility af = new HgBlameFacility(df);
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62 af.annotate(changelogRevisionIndex, fa, HgIterateDirection.NewToOld);
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63 }
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64
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65 // keeps <startSeq1, startSeq2, len> of equal blocks, origin to target, from some previous step
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66 private RangeSeq activeEquals;
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67 // equal blocks of the current iteration, to be recalculated before next step
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68 // to track line number (current target to ultimate target) mapping
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69 private RangeSeq intermediateEquals = new RangeSeq();
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70
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71 private boolean[] knownLines;
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72 private final LineInspector delegate;
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73 private RevisionDescriptor revisionDescriptor;
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74 private BlockData lineContent;
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75
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76 private IntMap<RangeSeq> mergedRanges = new IntMap<RangeSeq>(10);
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77 private IntMap<RangeSeq> equalRanges = new IntMap<RangeSeq>(10);
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78 private boolean activeEqualsComesFromMerge = false;
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79
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80 public FileAnnotation(LineInspector lineInspector) {
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81 delegate = lineInspector;
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82 }
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83
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84 public void start(RevisionDescriptor rd) {
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85 revisionDescriptor = rd;
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86 if (knownLines == null) {
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87 lineContent = rd.target();
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88 knownLines = new boolean[lineContent.elementCount()];
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89 activeEquals = new RangeSeq();
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90 activeEquals.add(0, 0, knownLines.length);
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91 equalRanges.put(rd.targetChangesetIndex(), activeEquals);
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92 } else {
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93 activeEquals = equalRanges.get(rd.targetChangesetIndex());
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94 if (activeEquals == null) {
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95 // we didn't see this target revision as origin yet
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96 // the only way this may happen is that this revision was a merge parent
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97 activeEquals = mergedRanges.get(rd.targetChangesetIndex());
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98 activeEqualsComesFromMerge = true;
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99 if (activeEquals == null) {
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100 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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101 }
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102 }
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103 }
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104 }
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105
557
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106 public void done(RevisionDescriptor rd) {
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107 // update line numbers of the intermediate target to point to ultimate target's line numbers
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108 RangeSeq v = intermediateEquals.intersect(activeEquals);
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109 if (activeEqualsComesFromMerge) {
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110 mergedRanges.put(rd.originChangesetIndex(), v);
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111 } else {
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112 equalRanges.put(rd.originChangesetIndex(), v);
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113 }
560
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114 if (rd.isMerge() && !mergedRanges.containsKey(rd.mergeChangesetIndex())) {
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115 // seen merge, but no lines were merged from p2.
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116 // Add empty range to avoid uncertainty when a parent of p2 pops in
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117 mergedRanges.put(rd.mergeChangesetIndex(), new RangeSeq());
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118 }
557
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119 intermediateEquals.clear();
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120 activeEquals = null;
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121 activeEqualsComesFromMerge = false;
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122 revisionDescriptor = null;
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123 }
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124
557
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125 public void same(EqualBlock block) {
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126 intermediateEquals.add(block.originStart(), block.targetStart(), block.length());
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127 }
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128
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129 public void added(AddBlock block) {
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130 RangeSeq rs = null;
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131 if (revisionDescriptor.isMerge() && block.originChangesetIndex() == revisionDescriptor.mergeChangesetIndex()) {
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132 rs = mergedRanges.get(revisionDescriptor.mergeChangesetIndex());
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133 if (rs == null) {
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134 mergedRanges.put(revisionDescriptor.mergeChangesetIndex(), rs = new RangeSeq());
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135 }
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136 }
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137 if (activeEquals.size() == 0) {
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138 return;
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139 }
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140 for (int i = 0, ln = block.firstAddedLine(), x = block.totalAddedLines(); i < x; i++, ln++) {
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141 int lnInFinal = activeEquals.mapLineIndex(ln);
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142 if (lnInFinal != -1/* && !knownLines[lnInFinal]*/) {
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143 if (rs != null) {
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144 rs.add(block.insertedAt() + i, lnInFinal, 1);
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145 } else {
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146 delegate.line(lnInFinal, block.targetChangesetIndex(), lineContent.elementAt(lnInFinal), new LineDescriptorImpl());
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147 }
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148 knownLines[lnInFinal] = true;
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149 }
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150 }
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151 }
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152
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153 public void changed(ChangeBlock block) {
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154 added(block);
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155 }
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156
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157 public void deleted(DeleteBlock block) {
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158 }
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159
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160 private final class LineDescriptorImpl implements LineDescriptor {
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161 LineDescriptorImpl() {
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162 }
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163
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164 public int totalLines() {
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165 return FileAnnotation.this.knownLines.length;
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166 }
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167 }
555
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168 }