Mercurial > jhg
annotate src/org/tmatesoft/hg/repo/Revlog.java @ 82:7255c971dd66
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author | Artem Tikhomirov <tikhomirov.artem@gmail.com> |
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date | Tue, 25 Jan 2011 04:14:42 +0100 |
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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@svnkit.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.repo.HgRepository.BAD_REVISION; |
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20 import static org.tmatesoft.hg.repo.HgRepository.TIP; |
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21 |
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22 import java.util.Arrays; |
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23 import java.util.Collection; |
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24 import java.util.Collections; |
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25 import java.util.HashMap; |
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26 import java.util.LinkedHashSet; |
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27 import java.util.Map; |
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28 import java.util.Set; |
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29 |
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30 import org.tmatesoft.hg.core.Nodeid; |
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31 import org.tmatesoft.hg.internal.RevlogStream; |
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32 |
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33 |
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34 /** |
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35 * |
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36 * @author Artem Tikhomirov |
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37 * @author TMate Software Ltd. |
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38 */ |
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39 abstract class Revlog { |
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40 |
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41 private final HgRepository hgRepo; |
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42 protected final RevlogStream content; |
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43 |
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44 protected Revlog(HgRepository hgRepo, RevlogStream content) { |
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45 if (hgRepo == null) { |
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46 throw new IllegalArgumentException(); |
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47 } |
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48 if (content == null) { |
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49 throw new IllegalArgumentException(); |
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50 } |
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51 this.hgRepo = hgRepo; |
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52 this.content = content; |
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53 } |
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54 |
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55 public final HgRepository getRepo() { |
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56 return hgRepo; |
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57 } |
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58 |
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59 public int getRevisionCount() { |
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60 return content.revisionCount(); |
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61 } |
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62 |
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63 public Nodeid getRevisionNumber(int revision) { |
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64 // XXX cache nodeids? |
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65 return Nodeid.fromBinary(content.nodeid(revision), 0); |
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66 } |
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67 |
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68 public int getLocalRevisionNumber(Nodeid nid) { |
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69 int revision = content.findLocalRevisionNumber(nid); |
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70 if (revision == BAD_REVISION) { |
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71 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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72 } |
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73 return revision; |
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74 } |
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75 |
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76 // Till now, i follow approach that NULL nodeid is never part of revlog |
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77 public boolean isKnown(Nodeid nodeid) { |
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78 final int rn = content.findLocalRevisionNumber(nodeid); |
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79 if (Integer.MIN_VALUE == rn) { |
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80 return false; |
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81 } |
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82 if (rn < 0 || rn >= content.revisionCount()) { |
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83 // Sanity check |
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84 throw new IllegalStateException(); |
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85 } |
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86 return true; |
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87 } |
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88 |
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89 /** |
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90 * 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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91 * @param nodeid |
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92 */ |
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93 public byte[] content(Nodeid nodeid) { |
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94 return content(getLocalRevisionNumber(nodeid)); |
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95 } |
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96 |
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97 /** |
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98 * @param revision - repo-local index of this file change (not a changelog revision number!) |
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99 */ |
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100 public byte[] content(int revision) { |
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101 final byte[][] dataPtr = new byte[1][]; |
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102 RevlogStream.Inspector insp = new RevlogStream.Inspector() { |
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103 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, byte[] data) { |
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104 dataPtr[0] = data; |
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105 } |
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106 }; |
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107 content.iterate(revision, revision, true, insp); |
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108 return dataPtr[0]; |
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109 } |
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110 |
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111 /** |
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112 * XXX perhaps, return value Nodeid[2] and boolean needNodeids is better (and higher level) API for this query? |
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113 * |
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114 * @param revision - revision to query parents, or {@link HgRepository#TIP} |
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115 * @param parentRevisions - int[2] to get local revision numbers of parents (e.g. {6, -1}) |
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116 * @param parent1 - byte[20] or null, if parent's nodeid is not needed |
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117 * @param parent2 - byte[20] or null, if second parent's nodeid is not needed |
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118 * @return |
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119 */ |
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120 public void parents(int revision, int[] parentRevisions, byte[] parent1, byte[] parent2) { |
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121 if (revision != TIP && !(revision >= 0 && revision < content.revisionCount())) { |
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122 throw new IllegalArgumentException(String.valueOf(revision)); |
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123 } |
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124 if (parentRevisions == null || parentRevisions.length < 2) { |
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125 throw new IllegalArgumentException(String.valueOf(parentRevisions)); |
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126 } |
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127 if (parent1 != null && parent1.length < 20) { |
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128 throw new IllegalArgumentException(parent1.toString()); |
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129 } |
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130 if (parent2 != null && parent2.length < 20) { |
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131 throw new IllegalArgumentException(parent2.toString()); |
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132 } |
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133 class ParentCollector implements RevlogStream.Inspector { |
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134 public int p1 = -1; |
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135 public int p2 = -1; |
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136 public byte[] nodeid; |
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137 |
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138 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, byte[] data) { |
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139 p1 = parent1Revision; |
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140 p2 = parent2Revision; |
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141 this.nodeid = new byte[20]; |
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142 // nodeid arg now comes in 32 byte from (as in file format description), however upper 12 bytes are zeros. |
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143 System.arraycopy(nodeid, nodeid.length > 20 ? nodeid.length - 20 : 0, this.nodeid, 0, 20); |
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144 } |
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145 }; |
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146 ParentCollector pc = new ParentCollector(); |
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147 content.iterate(revision, revision, false, pc); |
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148 parentRevisions[0] = pc.p1; |
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149 parentRevisions[1] = pc.p2; |
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150 if (parent1 != null) { |
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151 if (parentRevisions[0] == -1) { |
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152 Arrays.fill(parent1, 0, 20, (byte) 0); |
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153 } else { |
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154 content.iterate(parentRevisions[0], parentRevisions[0], false, pc); |
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155 System.arraycopy(pc.nodeid, 0, parent1, 0, 20); |
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156 } |
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157 } |
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158 if (parent2 != null) { |
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159 if (parentRevisions[1] == -1) { |
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160 Arrays.fill(parent2, 0, 20, (byte) 0); |
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161 } else { |
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162 content.iterate(parentRevisions[1], parentRevisions[1], false, pc); |
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163 System.arraycopy(pc.nodeid, 0, parent2, 0, 20); |
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164 } |
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165 } |
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166 } |
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167 |
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168 /* |
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169 * XXX think over if it's better to do either: |
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170 * pw = getChangelog().new ParentWalker(); pw.init() and pass pw instance around as needed |
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171 * or |
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172 * add Revlog#getParentWalker(), static class, make cons() and #init package-local, and keep SoftReference to allow walker reuse. |
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173 * |
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174 * and yes, walker is not a proper name |
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175 */ |
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176 public final class ParentWalker { |
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177 private Map<Nodeid, Nodeid> firstParent; |
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178 private Map<Nodeid, Nodeid> secondParent; |
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179 private Set<Nodeid> allNodes; |
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180 |
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181 public ParentWalker() { |
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182 firstParent = secondParent = Collections.emptyMap(); |
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183 allNodes = Collections.emptySet(); |
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184 } |
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185 |
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186 public void init() { |
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187 final RevlogStream stream = Revlog.this.content; |
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188 final int revisionCount = stream.revisionCount(); |
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189 firstParent = new HashMap<Nodeid, Nodeid>(revisionCount); |
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190 secondParent = new HashMap<Nodeid, Nodeid>(firstParent.size() >> 1); // assume branches/merges are less frequent |
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191 allNodes = new LinkedHashSet<Nodeid>(); |
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192 |
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193 RevlogStream.Inspector insp = new RevlogStream.Inspector() { |
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194 final Nodeid[] sequentialRevisionNodeids = new Nodeid[revisionCount]; |
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195 int ix = 0; |
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196 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, byte[] data) { |
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197 if (ix != revisionNumber) { |
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198 // XXX temp code, just to make sure I understand what's going on here |
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199 throw new IllegalStateException(); |
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200 } |
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201 if (parent1Revision >= revisionNumber || parent2Revision >= revisionNumber) { |
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202 throw new IllegalStateException(); // sanity, revisions are sequential |
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203 } |
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204 final Nodeid nid = new Nodeid(nodeid, true); |
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205 sequentialRevisionNodeids[ix++] = nid; |
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206 allNodes.add(nid); |
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207 if (parent1Revision != -1) { |
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208 firstParent.put(nid, sequentialRevisionNodeids[parent1Revision]); |
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209 if (parent2Revision != -1) { |
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210 secondParent.put(nid, sequentialRevisionNodeids[parent2Revision]); |
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211 } |
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212 } |
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213 } |
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214 }; |
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215 stream.iterate(0, -1, false, insp); |
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216 } |
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217 |
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218 public Set<Nodeid> allNodes() { |
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219 return Collections.unmodifiableSet(allNodes); |
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220 } |
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221 |
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222 // FIXME need to decide whether Nodeid(00 * 20) is always known or not |
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223 public boolean knownNode(Nodeid nid) { |
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224 return allNodes.contains(nid); |
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225 } |
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226 |
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227 // null if none |
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228 public Nodeid firstParent(Nodeid nid) { |
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229 return firstParent.get(nid); |
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230 } |
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231 |
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232 // never null, Nodeid.NULL if none known |
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233 public Nodeid safeFirstParent(Nodeid nid) { |
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234 Nodeid rv = firstParent(nid); |
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235 return rv == null ? Nodeid.NULL : rv; |
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236 } |
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237 |
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238 public Nodeid secondParent(Nodeid nid) { |
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239 return secondParent.get(nid); |
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240 } |
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241 |
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242 public Nodeid safeSecondParent(Nodeid nid) { |
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243 Nodeid rv = secondParent(nid); |
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244 return rv == null ? Nodeid.NULL : rv; |
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245 } |
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246 |
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247 public boolean appendParentsOf(Nodeid nid, Collection<Nodeid> c) { |
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248 Nodeid p1 = firstParent(nid); |
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249 boolean modified = false; |
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250 if (p1 != null) { |
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251 modified = c.add(p1); |
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252 Nodeid p2 = secondParent(nid); |
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253 if (p2 != null) { |
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254 modified = c.add(p2) || modified; |
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255 } |
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256 } |
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257 return modified; |
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258 } |
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259 } |
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260 } |