annotate src/org/tmatesoft/hg/repo/Revlog.java @ 224:7fe5982bcac0

Few tests for HgWorkingCopyStatusCollector
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 25 May 2011 03:07:39 +0200
parents 047b1dec7a04
children 0e01f9182e16
rev   line source
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1 /*
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2 * Copyright (c) 2010-2011 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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19 import static org.tmatesoft.hg.repo.HgRepository.BAD_REVISION;
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20 import static org.tmatesoft.hg.repo.HgRepository.TIP;
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22 import java.io.IOException;
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23 import java.nio.ByteBuffer;
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24 import java.util.Arrays;
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25 import java.util.Collection;
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26 import java.util.HashSet;
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27 import java.util.LinkedList;
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28 import java.util.List;
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30 import org.tmatesoft.hg.core.HgBadStateException;
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31 import org.tmatesoft.hg.core.HgException;
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32 import org.tmatesoft.hg.core.Nodeid;
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33 import org.tmatesoft.hg.internal.DataAccess;
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34 import org.tmatesoft.hg.internal.RevlogStream;
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35 import org.tmatesoft.hg.util.ByteChannel;
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36 import org.tmatesoft.hg.util.CancelSupport;
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37 import org.tmatesoft.hg.util.CancelledException;
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38 import org.tmatesoft.hg.util.ProgressSupport;
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40
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41 /**
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42 * Base class for all Mercurial entities that are serialized in a so called revlog format (changelog, manifest, data files).
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43 *
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44 * Implementation note:
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45 * Hides actual actual revlog stream implementation and its access methods (i.e. RevlogStream.Inspector), iow shall not expose anything internal
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46 * in public methods.
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47 *
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48 * @author Artem Tikhomirov
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49 * @author TMate Software Ltd.
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50 */
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51 abstract class Revlog {
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52
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53 private final HgRepository repo;
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54 protected final RevlogStream content;
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56 protected Revlog(HgRepository hgRepo, RevlogStream contentStream) {
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57 if (hgRepo == null) {
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58 throw new IllegalArgumentException();
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59 }
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60 if (contentStream == null) {
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61 throw new IllegalArgumentException();
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62 }
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63 repo = hgRepo;
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64 content = contentStream;
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65 }
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67 // invalid Revlog
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68 protected Revlog(HgRepository hgRepo) {
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69 repo = hgRepo;
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70 content = null;
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71 }
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73 public final HgRepository getRepo() {
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74 return repo;
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75 }
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77 public final int getRevisionCount() {
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78 return content.revisionCount();
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79 }
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81 public final int getLastRevision() {
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82 return content.revisionCount() - 1;
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83 }
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84
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85 public final Nodeid getRevision(int revision) {
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86 // XXX cache nodeids?
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87 return Nodeid.fromBinary(content.nodeid(revision), 0);
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88 }
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90 public final int getLocalRevision(Nodeid nid) {
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91 int revision = content.findLocalRevisionNumber(nid);
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92 if (revision == BAD_REVISION) {
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93 throw new IllegalArgumentException(String.format("%s doesn't represent a revision of %s", nid.toString(), this /*XXX HgDataFile.getPath might be more suitable here*/));
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94 }
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95 return revision;
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96 }
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97
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98 // Till now, i follow approach that NULL nodeid is never part of revlog
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99 public final boolean isKnown(Nodeid nodeid) {
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100 final int rn = content.findLocalRevisionNumber(nodeid);
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101 if (BAD_REVISION == rn) {
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102 return false;
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103 }
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104 if (rn < 0 || rn >= content.revisionCount()) {
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105 // Sanity check
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106 throw new IllegalStateException();
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107 }
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108 return true;
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109 }
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111 /**
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112 * Access to revision data as is (decompressed, but otherwise unprocessed, i.e. not parsed for e.g. changeset or manifest entries)
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113 * @param nodeid
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114 */
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115 protected void rawContent(Nodeid nodeid, ByteChannel sink) throws HgException, IOException, CancelledException {
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116 rawContent(getLocalRevision(nodeid), sink);
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117 }
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119 /**
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120 * @param revision - repo-local index of this file change (not a changelog revision number!)
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121 */
157
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122 protected void rawContent(int revision, ByteChannel sink) throws HgException, IOException, CancelledException {
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123 if (sink == null) {
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124 throw new IllegalArgumentException();
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125 }
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126 ContentPipe insp = new ContentPipe(sink, 0);
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127 insp.checkCancelled();
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128 content.iterate(revision, revision, true, insp);
157
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129 insp.checkFailed();
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130 }
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131
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132 /**
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133 * XXX perhaps, return value Nodeid[2] and boolean needNodeids is better (and higher level) API for this query?
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134 *
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135 * @param revision - revision to query parents, or {@link HgRepository#TIP}
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136 * @param parentRevisions - int[2] to get local revision numbers of parents (e.g. {6, -1})
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137 * @param parent1 - byte[20] or null, if parent's nodeid is not needed
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138 * @param parent2 - byte[20] or null, if second parent's nodeid is not needed
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139 * @return
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140 */
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141 public void parents(int revision, int[] parentRevisions, byte[] parent1, byte[] parent2) {
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142 if (revision != TIP && !(revision >= 0 && revision < content.revisionCount())) {
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143 throw new IllegalArgumentException(String.valueOf(revision));
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144 }
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145 if (parentRevisions == null || parentRevisions.length < 2) {
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146 throw new IllegalArgumentException(String.valueOf(parentRevisions));
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147 }
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148 if (parent1 != null && parent1.length < 20) {
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149 throw new IllegalArgumentException(parent1.toString());
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150 }
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151 if (parent2 != null && parent2.length < 20) {
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152 throw new IllegalArgumentException(parent2.toString());
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153 }
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154 class ParentCollector implements RevlogStream.Inspector {
56
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155 public int p1 = -1;
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156 public int p2 = -1;
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157 public byte[] nodeid;
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158
157
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159 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess da) {
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160 p1 = parent1Revision;
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161 p2 = parent2Revision;
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162 this.nodeid = new byte[20];
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163 // nodeid arg now comes in 32 byte from (as in file format description), however upper 12 bytes are zeros.
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164 System.arraycopy(nodeid, nodeid.length > 20 ? nodeid.length - 20 : 0, this.nodeid, 0, 20);
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165 }
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166 };
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167 ParentCollector pc = new ParentCollector();
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168 content.iterate(revision, revision, false, pc);
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169 parentRevisions[0] = pc.p1;
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170 parentRevisions[1] = pc.p2;
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171 if (parent1 != null) {
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172 if (parentRevisions[0] == -1) {
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173 Arrays.fill(parent1, 0, 20, (byte) 0);
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174 } else {
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175 content.iterate(parentRevisions[0], parentRevisions[0], false, pc);
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176 System.arraycopy(pc.nodeid, 0, parent1, 0, 20);
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177 }
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178 }
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179 if (parent2 != null) {
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180 if (parentRevisions[1] == -1) {
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181 Arrays.fill(parent2, 0, 20, (byte) 0);
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182 } else {
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183 content.iterate(parentRevisions[1], parentRevisions[1], false, pc);
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184 System.arraycopy(pc.nodeid, 0, parent2, 0, 20);
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185 }
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186 }
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187 }
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188
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189 /*
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190 * XXX think over if it's better to do either:
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191 * pw = getChangelog().new ParentWalker(); pw.init() and pass pw instance around as needed
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192 * or
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193 * add Revlog#getParentWalker(), static class, make cons() and #init package-local, and keep SoftReference to allow walker reuse.
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194 *
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195 * and yes, walker is not a proper name
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196 */
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197 public final class ParentWalker {
200
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198
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199
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200 private Nodeid[] sequential; // natural repository order, childrenOf rely on ordering
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201 private Nodeid[] sorted; // for binary search
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202 private int[] sorted2natural;
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203 private Nodeid[] firstParent;
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204 private Nodeid[] secondParent;
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205
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206 // Nodeid instances shall be shared between all arrays
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207
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208 public ParentWalker() {
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209 }
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210
192
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211 public HgRepository getRepo() {
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212 return Revlog.this.getRepo();
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213 }
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214
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215 public void init() {
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216 final RevlogStream stream = Revlog.this.content;
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217 final int revisionCount = stream.revisionCount();
200
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218 firstParent = new Nodeid[revisionCount];
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219 // although branches/merges are less frequent, and most of secondParent would be -1/null, some sort of
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220 // SparseOrderedList might be handy, provided its inner structures do not overweight simplicity of an array
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221 secondParent = new Nodeid[revisionCount];
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222 //
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223 sequential = new Nodeid[revisionCount];
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224 sorted = new Nodeid[revisionCount];
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225
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226 RevlogStream.Inspector insp = new RevlogStream.Inspector() {
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227
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228 int ix = 0;
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229 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess da) {
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230 if (ix != revisionNumber) {
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231 // XXX temp code, just to make sure I understand what's going on here
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232 throw new IllegalStateException();
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233 }
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234 if (parent1Revision >= revisionNumber || parent2Revision >= revisionNumber) {
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235 throw new IllegalStateException(); // sanity, revisions are sequential
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236 }
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237 final Nodeid nid = new Nodeid(nodeid, true);
200
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238 sequential[ix] = sorted[ix] = nid;
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239 if (parent1Revision != -1) {
200
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diff changeset
240 assert parent1Revision < ix;
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diff changeset
241 firstParent[ix] = sequential[parent1Revision];
183
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242 }
200
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243 if (parent2Revision != -1) { // revlog of DataAccess.java has p2 set when p1 is -1
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244 assert parent2Revision < ix;
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245 secondParent[ix] = sequential[parent2Revision];
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246 }
200
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247 ix++;
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248 }
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249 };
197
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250 stream.iterate(0, TIP, false, insp);
200
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251 Arrays.sort(sorted);
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252 sorted2natural = new int[revisionCount];
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253 for (int i = 0; i < revisionCount; i++) {
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254 Nodeid n = sequential[i];
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255 int x = Arrays.binarySearch(sorted, n);
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256 assertSortedIndex(x);
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257 sorted2natural[x] = i;
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258 }
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259 }
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260
200
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261 private void assertSortedIndex(int x) {
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262 if (x < 0) {
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263 throw new HgBadStateException();
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264 }
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265 }
31
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266
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267 // FIXME need to decide whether Nodeid(00 * 20) is always known or not
200
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268 // right now Nodeid.NULL is not recognized as known if passed to this method,
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269 // caller is supposed to make explicit check
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270 public boolean knownNode(Nodeid nid) {
200
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271 return Arrays.binarySearch(sorted, nid) >= 0;
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272 }
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273
200
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274 /**
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275 * null if none. only known nodes (as per #knownNode) are accepted as arguments
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276 */
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277 public Nodeid firstParent(Nodeid nid) {
200
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278 int x = Arrays.binarySearch(sorted, nid);
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279 assertSortedIndex(x);
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280 int i = sorted2natural[x];
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281 return firstParent[i];
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282 }
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283
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284 // never null, Nodeid.NULL if none known
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285 public Nodeid safeFirstParent(Nodeid nid) {
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286 Nodeid rv = firstParent(nid);
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287 return rv == null ? Nodeid.NULL : rv;
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288 }
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289
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290 public Nodeid secondParent(Nodeid nid) {
200
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291 int x = Arrays.binarySearch(sorted, nid);
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292 assertSortedIndex(x);
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293 int i = sorted2natural[x];
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294 return secondParent[i];
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295 }
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296
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297 public Nodeid safeSecondParent(Nodeid nid) {
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298 Nodeid rv = secondParent(nid);
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299 return rv == null ? Nodeid.NULL : rv;
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300 }
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301
29
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302 public boolean appendParentsOf(Nodeid nid, Collection<Nodeid> c) {
200
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303 int x = Arrays.binarySearch(sorted, nid);
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304 assertSortedIndex(x);
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305 int i = sorted2natural[x];
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306 Nodeid p1 = firstParent[i];
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307 boolean modified = false;
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308 if (p1 != null) {
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309 modified = c.add(p1);
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310 }
200
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311 Nodeid p2 = secondParent[i];
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312 if (p2 != null) {
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313 modified = c.add(p2) || modified;
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314 }
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315 return modified;
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316 }
171
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317
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318 // XXX alternative (and perhaps more reliable) approach would be to make a copy of allNodes and remove
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319 // nodes, their parents and so on.
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320
200
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321 // @return ordered collection of all children rooted at supplied nodes. Nodes shall not be descendants of each other!
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322 // Nodeids shall belong to this revlog
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323 public List<Nodeid> childrenOf(List<Nodeid> roots) {
171
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324 HashSet<Nodeid> parents = new HashSet<Nodeid>();
200
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325 LinkedList<Nodeid> result = new LinkedList<Nodeid>();
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326 int earliestRevision = Integer.MAX_VALUE;
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327 assert sequential.length == firstParent.length && firstParent.length == secondParent.length;
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328 // first, find earliest index of roots in question, as there's no sense
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329 // to check children among nodes prior to branch's root node
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330 for (Nodeid r : roots) {
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331 int x = Arrays.binarySearch(sorted, r);
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332 assertSortedIndex(x);
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333 int i = sorted2natural[x];
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334 if (i < earliestRevision) {
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335 earliestRevision = i;
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336 }
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337 parents.add(sequential[i]); // add canonical instance in hope equals() is bit faster when can do a ==
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338 }
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339 for (int i = earliestRevision + 1; i < sequential.length; i++) {
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340 if (parents.contains(firstParent[i]) || parents.contains(secondParent[i])) {
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341 parents.add(sequential[i]); // to find next child
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342 result.add(sequential[i]);
171
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343 }
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344 }
200
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345 return result;
171
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346 }
192
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347
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348 /**
200
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349 * @param nid possibly parent node, shall be {@link #knownNode(Nodeid) known} in this revlog.
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350 * @return <code>true</code> if there's any node in this revlog that has specified node as one of its parents.
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351 */
200
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352 public boolean hasChildren(Nodeid nid) {
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353 int x = Arrays.binarySearch(sorted, nid);
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354 assertSortedIndex(x);
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355 int i = sorted2natural[x];
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356 assert firstParent.length == secondParent.length; // just in case later I implement sparse array for secondParent
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357 assert firstParent.length == sequential.length;
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358 // to use == instead of equals, take the same Nodeid instance we used to fill all the arrays.
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359 final Nodeid canonicalNode = sequential[i];
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360 i++; // no need to check node itself. child nodes may appear in sequential only after revision in question
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361 for (; i < sequential.length; i++) {
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362 // FIXME likely, not very effective.
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363 // May want to optimize it with another (Tree|Hash)Set, created on demand on first use,
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364 // however, need to be careful with memory usage
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365 if (firstParent[i] == canonicalNode || secondParent[i] == canonicalNode) {
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366 return true;
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367 }
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368 }
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369 return false;
192
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370 }
29
6cce719bbb62 Collector for nodes and their parents
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371 }
157
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372
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373 protected static class ContentPipe implements RevlogStream.Inspector, CancelSupport {
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374 private final ByteChannel sink;
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375 private final CancelSupport cancelSupport;
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376 private Exception failure;
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377 private final int offset;
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378
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379 /**
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380 * @param _sink - cannot be <code>null</code>
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381 * @param seekOffset - when positive, orders to pipe bytes to the sink starting from specified offset, not from the first byte available in DataAccess
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382 */
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383 public ContentPipe(ByteChannel _sink, int seekOffset) {
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384 assert _sink != null;
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385 sink = _sink;
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386 cancelSupport = CancelSupport.Factory.get(_sink);
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387 offset = seekOffset;
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388 }
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389
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390 protected void prepare(int revisionNumber, DataAccess da) throws HgException, IOException {
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391 if (offset > 0) { // save few useless reset/rewind operations
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392 da.seek(offset);
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393 }
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394 }
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395
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396 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess da) {
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397 try {
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398 prepare(revisionNumber, da); // XXX perhaps, prepare shall return DA (sliced, if needed)
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399 final ProgressSupport progressSupport = ProgressSupport.Factory.get(sink);
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400 ByteBuffer buf = ByteBuffer.allocate(512);
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401 progressSupport.start(da.length());
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402 while (!da.isEmpty()) {
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403 cancelSupport.checkCancelled();
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404 da.readBytes(buf);
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405 buf.flip();
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406 // XXX I may not rely on returned number of bytes but track change in buf position instead.
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407 int consumed = sink.write(buf);
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408 // FIXME in fact, bad sink implementation (that consumes no bytes) would result in endless loop. Need to account for this
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409 buf.compact();
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410 progressSupport.worked(consumed);
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411 }
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412 progressSupport.done(); // XXX shall specify whether #done() is invoked always or only if completed successfully.
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413 } catch (IOException ex) {
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414 recordFailure(ex);
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415 } catch (CancelledException ex) {
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416 recordFailure(ex);
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417 } catch (HgException ex) {
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418 recordFailure(ex);
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419 }
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420 }
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421
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422 public void checkCancelled() throws CancelledException {
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423 cancelSupport.checkCancelled();
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424 }
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425
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426 protected void recordFailure(Exception ex) {
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427 assert failure == null;
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428 failure = ex;
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429 }
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430
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431 public void checkFailed() throws HgException, IOException, CancelledException {
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432 if (failure == null) {
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433 return;
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434 }
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435 if (failure instanceof IOException) {
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436 throw (IOException) failure;
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437 }
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438 if (failure instanceof CancelledException) {
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439 throw (CancelledException) failure;
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440 }
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441 if (failure instanceof HgException) {
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442 throw (HgException) failure;
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443 }
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444 throw new HgBadStateException(failure);
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445 }
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446 }
2
08db726a0fb7 Shaping out low-level Hg structures
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447 }