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annotate src/org/tmatesoft/hg/repo/HgBlameFacility.java @ 596:43cfa08ff3fd

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HgBlameFacility refactoring: extract code to build file history that spans renames
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 02 May 2013 19:23:53 +0200
parents e49f9d9513fa
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.repo;
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18
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19 import static org.tmatesoft.hg.core.HgIterateDirection.OldToNew;
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20 import static org.tmatesoft.hg.repo.HgInternals.wrongRevisionIndex;
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21 import static org.tmatesoft.hg.repo.HgRepository.NO_REVISION;
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22 import static org.tmatesoft.hg.repo.HgRepository.TIP;
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23
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24 import org.tmatesoft.hg.core.HgCallbackTargetException;
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25 import org.tmatesoft.hg.core.HgIterateDirection;
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26 import org.tmatesoft.hg.core.Nodeid;
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27 import org.tmatesoft.hg.internal.BlameHelper;
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28 import org.tmatesoft.hg.internal.Callback;
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29 import org.tmatesoft.hg.internal.Experimental;
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30 import org.tmatesoft.hg.internal.FileHistory;
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31 import org.tmatesoft.hg.internal.FileRevisionHistoryChunk;
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32 import org.tmatesoft.hg.util.Adaptable;
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33
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34 /**
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35 * Facility with diff/annotate functionality.
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36 *
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37 * @author Artem Tikhomirov
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38 * @author TMate Software Ltd.
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39 */
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40 @Experimental(reason="Unstable API")
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41 public final class HgBlameFacility {
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42 private final HgDataFile df;
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43
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44 public HgBlameFacility(HgDataFile file) {
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45 if (file == null) {
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46 throw new IllegalArgumentException();
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47 }
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48 df = file;
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49 }
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51 /**
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52 * mimic 'hg diff -r clogRevIndex1 -r clogRevIndex2'
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53 */
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54 public void diff(int clogRevIndex1, int clogRevIndex2, Inspector insp) throws HgCallbackTargetException {
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55 // FIXME clogRevIndex1 and clogRevIndex2 may point to different files, need to decide whether to throw an exception
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56 // or to attempt to look up correct file node (tricky)
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57 int fileRevIndex1 = fileRevIndex(df, clogRevIndex1);
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58 int fileRevIndex2 = fileRevIndex(df, clogRevIndex2);
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59 BlameHelper bh = new BlameHelper(insp, 5);
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60 bh.useFileUpTo(df, clogRevIndex2);
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61 bh.diff(fileRevIndex1, clogRevIndex1, fileRevIndex2, clogRevIndex2);
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62 }
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63
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64 /**
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65 * Walk file history up/down to revision at given changeset and report changes for each revision
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66 */
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67 public void annotate(int changelogRevisionIndex, Inspector insp, HgIterateDirection iterateOrder) throws HgCallbackTargetException {
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68 annotate(0, changelogRevisionIndex, insp, iterateOrder);
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69 }
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70
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71 /**
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72 * Walk file history range and report changes for each revision
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73 */
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74 public void annotate(int changelogRevIndexStart, int changelogRevIndexEnd, Inspector insp, HgIterateDirection iterateOrder) throws HgCallbackTargetException {
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75 if (wrongRevisionIndex(changelogRevIndexStart) || wrongRevisionIndex(changelogRevIndexEnd)) {
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76 throw new IllegalArgumentException();
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77 }
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78 // Note, changelogRevIndexEnd may be TIP, while the code below doesn't tolerate constants
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79 //
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80 int lastRevision = df.getRepo().getChangelog().getLastRevision();
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81 if (changelogRevIndexEnd == TIP) {
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82 changelogRevIndexEnd = lastRevision;
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83 }
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84 HgInternals.checkRevlogRange(changelogRevIndexStart, changelogRevIndexEnd, lastRevision);
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85 if (!df.exists()) {
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86 return;
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87 }
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88 FileHistory fileHistory = new FileHistory(df, changelogRevIndexStart, changelogRevIndexEnd);
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89 fileHistory.build();
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90 BlameHelper bh = new BlameHelper(insp, 10);
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91 for (FileRevisionHistoryChunk fhc : fileHistory.iterate(OldToNew)) {
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92 // iteration order is not important here
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93 bh.useFileUpTo(fhc.getFile(), fhc.getEndChangeset());
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94 }
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95 int[] fileClogParentRevs = new int[2];
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96 int[] fileParentRevs = new int[2];
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97 for (FileRevisionHistoryChunk fhc : fileHistory.iterate(iterateOrder)) {
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98 for (int fri : fhc.fileRevisions(iterateOrder)) {
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99 int clogRevIndex = fhc.changeset(fri);
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100 // the way we built fileHistory ensures we won't walk past [changelogRevIndexStart..changelogRevIndexEnd]
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101 assert clogRevIndex >= changelogRevIndexStart;
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102 assert clogRevIndex <= changelogRevIndexEnd;
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103 fhc.fillFileParents(fri, fileParentRevs);
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104 fhc.fillCsetParents(fri, fileClogParentRevs);
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105 bh.annotateChange(fri, clogRevIndex, fileParentRevs, fileClogParentRevs);
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106 }
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107 }
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108 }
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109
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110 /**
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111 * Annotates changes of the file against its parent(s).
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112 * Unlike {@link #annotate(HgDataFile, int, Inspector, HgIterateDirection)}, doesn't
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113 * walk file history, looks at the specified revision only. Handles both parents (if merge revision).
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114 */
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115 public void annotateSingleRevision(int changelogRevisionIndex, Inspector insp) throws HgCallbackTargetException {
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116 // TODO detect if file is text/binary (e.g. looking for chars < ' ' and not \t\r\n\f
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117 int fileRevIndex = fileRevIndex(df, changelogRevisionIndex);
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118 int[] fileRevParents = new int[2];
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119 df.parents(fileRevIndex, fileRevParents, null, null);
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120 if (changelogRevisionIndex == TIP) {
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121 changelogRevisionIndex = df.getChangesetRevisionIndex(fileRevIndex);
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122 }
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123 BlameHelper bh = new BlameHelper(insp, 5);
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124 bh.useFileUpTo(df, changelogRevisionIndex);
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125 int[] fileClogParentRevs = new int[2];
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126 fileClogParentRevs[0] = fileRevParents[0] == NO_REVISION ? NO_REVISION : df.getChangesetRevisionIndex(fileRevParents[0]);
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127 fileClogParentRevs[1] = fileRevParents[1] == NO_REVISION ? NO_REVISION : df.getChangesetRevisionIndex(fileRevParents[1]);
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128 bh.annotateChange(fileRevIndex, changelogRevisionIndex, fileRevParents, fileClogParentRevs);
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129 }
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130
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131 /**
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132 * Client's sink for revision differences.
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133 *
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134 * When implemented, clients shall not expect new {@link Block blocks} instances in each call.
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135 *
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136 * In case more information about annotated revision is needed, inspector instances may supply
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137 * {@link RevisionDescriptor.Recipient} through {@link Adaptable}.
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138 */
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139 @Callback
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140 public interface Inspector {
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141 void same(EqualBlock block) throws HgCallbackTargetException;
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142 void added(AddBlock block) throws HgCallbackTargetException;
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143 void changed(ChangeBlock block) throws HgCallbackTargetException;
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144 void deleted(DeleteBlock block) throws HgCallbackTargetException;
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145 }
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146
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147 /**
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148 * Represents content of a block, either as a sequence of bytes or a
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149 * sequence of smaller blocks (lines), if appropriate (according to usage context).
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150 *
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151 * This approach allows line-by-line access to content data along with complete byte sequence for the whole block, i.e.
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152 * <pre>
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153 * BlockData bd = addBlock.addedLines()
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154 * // bd describes data from the addition completely.
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155 * // elements of the BlockData are lines
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156 * bd.elementCount() == addBlock.totalAddedLines();
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157 * // one cat obtain complete addition with
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158 * byte[] everythingAdded = bd.asArray();
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159 * // or iterate line by line
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160 * for (int i = 0; i < bd.elementCount(); i++) {
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161 * byte[] lineContent = bd.elementAt(i);
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162 * String line = new String(lineContent, fileEncodingCharset);
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163 * }
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164 * where bd.elementAt(0) is the line at index addBlock.firstAddedLine()
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165 * </pre>
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166 *
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167 * LineData or ChunkData?
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168 */
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169 public interface BlockData {
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170 BlockData elementAt(int index);
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171 int elementCount();
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172 byte[] asArray();
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173 }
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174
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175 /**
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176 * {@link Inspector} may optionally request extra information about revisions
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177 * being inspected, denoting itself as a {@link RevisionDescriptor.Recipient}. This class
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178 * provides complete information about file revision under annotation now.
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179 */
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180 public interface RevisionDescriptor {
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181 /**
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182 * @return complete source of the diff origin, never <code>null</code>
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183 */
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184 BlockData origin();
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185 /**
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186 * @return complete source of the diff target, never <code>null</code>
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187 */
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188 BlockData target();
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189 /**
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190 * @return changeset revision index of original file, or {@link HgRepository#NO_REVISION} if it's the very first revision
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191 */
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192 int originChangesetIndex();
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193 /**
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194 * @return changeset revision index of the target file
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195 */
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196 int targetChangesetIndex();
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197 /**
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198 * @return <code>true</code> if this revision is merge
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199 */
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200 boolean isMerge();
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201 /**
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202 * @return changeset revision index of the second, merged parent
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203 */
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204 int mergeChangesetIndex();
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205 /**
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206 * @return revision index of the change in target file's revlog
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207 */
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208 int fileRevisionIndex();
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209
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210 /**
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211 * @return file object under blame (target file)
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212 */
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213 HgDataFile file();
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214
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215 /**
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216 * Implement to indicate interest in {@link RevisionDescriptor}.
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217 *
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218 * Note, instance of {@link RevisionDescriptor} is the same for
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219 * {@link #start(RevisionDescriptor)} and {@link #done(RevisionDescriptor)}
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220 * methods, and not necessarily a new one (i.e. <code>==</code>) for the next
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221 * revision announced.
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222 */
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223 @Callback
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224 public interface Recipient {
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225 /**
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226 * Comes prior to any change {@link Block blocks}
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227 */
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228 void start(RevisionDescriptor revisionDescription) throws HgCallbackTargetException;
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229 /**
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230 * Comes after all change {@link Block blocks} were dispatched
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231 */
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232 void done(RevisionDescriptor revisionDescription) throws HgCallbackTargetException;
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233 }
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234 }
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235
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236 /**
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237 * Each change block comes from a single origin, blocks that are result of a merge
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238 * have {@link #originChangesetIndex()} equal to {@link RevisionDescriptor#mergeChangesetIndex()}.
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239 */
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240 public interface Block {
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241 int originChangesetIndex();
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242 int targetChangesetIndex();
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243 }
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244
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245 public interface EqualBlock extends Block {
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246 int originStart();
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247 int targetStart();
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248 int length();
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249 BlockData content();
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250 }
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251
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252 public interface AddBlock extends Block {
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253 /**
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254 * @return line index in the origin where this block is inserted
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255 */
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256 int insertedAt();
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257 /**
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258 * @return line index of the first added line in the target revision
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259 */
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260 int firstAddedLine();
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261 /**
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262 * @return number of added lines in this block
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263 */
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264 int totalAddedLines();
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265 /**
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266 * @return content of added lines
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267 */
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268 BlockData addedLines();
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269 }
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270 public interface DeleteBlock extends Block {
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271 /**
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272 * @return line index in the target revision were this deleted block would be
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273 */
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274 int removedAt();
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275 /**
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276 * @return line index of the first removed line in the original revision
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277 */
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278 int firstRemovedLine();
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279 /**
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280 * @return number of deleted lines in this block
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281 */
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282 int totalRemovedLines();
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283 /**
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284 * @return content of deleted lines
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285 */
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286 BlockData removedLines();
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287 }
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288 public interface ChangeBlock extends AddBlock, DeleteBlock {
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289 }
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291
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292 private static int fileRevIndex(HgDataFile df, int csetRevIndex) {
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293 Nodeid fileRev = df.getRepo().getManifest().getFileRevision(csetRevIndex, df.getPath());
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294 return df.getRevisionIndex(fileRev);
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295 }
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296 }