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annotate src/org/tmatesoft/hg/core/HgBlameInspector.java @ 680:58a6900f845d

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Blame: alternative strategy to handle merge revisions: map(diff(p1->base->p2)) to understand merge intentions better
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Sun, 21 Jul 2013 17:15:34 +0200
parents 5f52074707b2
children 497e697636fc
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.core;
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18
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19 import org.tmatesoft.hg.core.HgCallbackTargetException;
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20 import org.tmatesoft.hg.internal.Callback;
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21 import org.tmatesoft.hg.internal.Experimental;
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22 import org.tmatesoft.hg.repo.HgDataFile;
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23 import org.tmatesoft.hg.util.Adaptable;
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24
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25 /**
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26 * Client's sink for revision differences, diff/annotate functionality.
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27 *
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28 * When implemented, clients shall not expect new {@link Block blocks} instances in each call.
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29 *
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30 * In case more information about annotated revision is needed, inspector instances may supply
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31 * {@link RevisionDescriptor.Recipient} through {@link Adaptable}.
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32 *
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33 * @author Artem Tikhomirov
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34 * @author TMate Software Ltd.
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35 * @since 1.1
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36 */
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37 @Callback
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38 @Experimental(reason="Unstable API")
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39 public interface HgBlameInspector {
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40
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41 void same(EqualBlock block) throws HgCallbackTargetException;
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42 void added(AddBlock block) throws HgCallbackTargetException;
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43 void changed(ChangeBlock block) throws HgCallbackTargetException;
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44 void deleted(DeleteBlock block) throws HgCallbackTargetException;
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45
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46 /**
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47 * Represents content of a block, either as a sequence of bytes or a
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48 * sequence of smaller blocks (lines), if appropriate (according to usage context).
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49 *
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50 * 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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51 * <pre>
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52 * BlockData bd = addBlock.addedLines()
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53 * // bd describes data from the addition completely.
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54 * // elements of the BlockData are lines
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55 * bd.elementCount() == addBlock.totalAddedLines();
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56 * // one cat obtain complete addition with
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57 * byte[] everythingAdded = bd.asArray();
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58 * // or iterate line by line
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59 * for (int i = 0; i < bd.elementCount(); i++) {
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60 * byte[] lineContent = bd.elementAt(i);
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61 * String line = new String(lineContent, fileEncodingCharset);
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62 * }
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63 * where bd.elementAt(0) is the line at index addBlock.firstAddedLine()
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64 * </pre>
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65 *
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66 * LineData or ChunkData?
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67 */
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68 public interface BlockData {
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69 BlockData elementAt(int index);
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70 int elementCount();
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71 byte[] asArray();
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72 }
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73
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74 /**
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75 * {@link HgBlameInspector} may optionally request extra information about revisions
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76 * being inspected, denoting itself as a {@link RevisionDescriptor.Recipient}. This class
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77 * provides complete information about file revision under annotation now.
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78 */
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79 public interface RevisionDescriptor {
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80 /**
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81 * @return complete source of the diff origin, never <code>null</code>
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82 */
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83 BlockData origin();
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84 /**
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85 * @return complete source of the diff target, never <code>null</code>
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86 */
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87 BlockData target();
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88 /**
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89 * @return changeset revision index of original file, or {@link HgRepository#NO_REVISION} if it's the very first revision
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90 */
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91 int originChangesetIndex();
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92 /**
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93 * @return changeset revision index of the target file
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94 */
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95 int targetChangesetIndex();
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96 /**
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97 * @return <code>true</code> if this revision is merge
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98 */
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99 boolean isMerge();
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100 /**
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101 * @return changeset revision index of the second, merged parent
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102 */
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103 int mergeChangesetIndex();
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104 /**
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105 * @return revision index of the change in target file's revlog
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106 */
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107 int fileRevisionIndex();
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108
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109 /**
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110 * @return file object under blame (target file)
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111 */
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112 HgDataFile file();
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113
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114 /**
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115 * Implement to indicate interest in {@link RevisionDescriptor}.
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116 *
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117 * Note, instance of {@link RevisionDescriptor} is the same for
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118 * {@link #start(RevisionDescriptor)} and {@link #done(RevisionDescriptor)}
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119 * methods, and not necessarily a new one (i.e. <code>==</code>) for the next
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120 * revision announced.
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121 */
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122 @Callback
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123 public interface Recipient {
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124 /**
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125 * Comes prior to any change {@link Block blocks}
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126 */
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127 void start(RevisionDescriptor revisionDescription) throws HgCallbackTargetException;
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128 /**
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129 * Comes after all change {@link Block blocks} were dispatched
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130 */
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131 void done(RevisionDescriptor revisionDescription) throws HgCallbackTargetException;
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132 }
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133 }
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134
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135 /**
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136 * Each change block comes from a single origin, blocks that are result of a merge
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137 * have {@link #originChangesetIndex()} equal to {@link RevisionDescriptor#mergeChangesetIndex()}.
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138 */
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139 public interface Block {
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140 int originChangesetIndex();
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141 int targetChangesetIndex();
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142 }
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143
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144 public interface EqualBlock extends Block {
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145 int originStart();
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146 int targetStart();
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147 int length();
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148 BlockData content();
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149 }
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150
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151 public interface AddBlock extends Block {
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152 /**
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153 * @return line index in the origin where this block is inserted
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154 */
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155 int insertedAt();
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156 /**
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157 * @return line index of the first added line in the target revision
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158 */
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159 int firstAddedLine();
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160 /**
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161 * @return number of added lines in this block
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162 */
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163 int totalAddedLines();
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164 /**
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165 * @return content of added lines
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166 */
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167 BlockData addedLines();
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168 }
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169 public interface DeleteBlock extends Block {
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170 /**
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171 * @return line index in the target revision were this deleted block would be
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172 */
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173 int removedAt();
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174 /**
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175 * @return line index of the first removed line in the original revision
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176 */
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177 int firstRemovedLine();
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178 /**
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179 * @return number of deleted lines in this block
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180 */
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181 int totalRemovedLines();
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182 /**
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183 * @return content of deleted lines
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184 */
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185 BlockData removedLines();
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186 }
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187 public interface ChangeBlock extends AddBlock, DeleteBlock {
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188 }
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189 }