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annotate src/org/tmatesoft/hg/repo/Revlog.java @ 74:6f1b88693d48

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Complete refactoring to org.tmatesoft
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Mon, 24 Jan 2011 03:14:45 +0100
parents src/com/tmate/hgkit/ll/Revlog.java@576d6e8a09f6
children c677e1593919
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@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.TIP;
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20
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21 import java.util.Arrays;
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22 import java.util.Collection;
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23 import java.util.Collections;
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24 import java.util.HashMap;
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25 import java.util.LinkedHashSet;
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26 import java.util.Map;
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27 import java.util.Set;
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28
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29 import org.tmatesoft.hg.core.Nodeid;
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30
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31
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32 /**
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33 *
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34 * @author Artem Tikhomirov
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35 * @author TMate Software Ltd.
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36 */
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37 abstract class Revlog {
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38
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39 private final HgRepository hgRepo;
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40 protected final RevlogStream content;
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41
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42 protected Revlog(HgRepository hgRepo, RevlogStream content) {
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43 if (hgRepo == null) {
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44 throw new IllegalArgumentException();
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45 }
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46 if (content == null) {
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47 throw new IllegalArgumentException();
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48 }
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49 this.hgRepo = hgRepo;
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50 this.content = content;
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51 }
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52
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53 public final HgRepository getRepo() {
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54 return hgRepo;
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55 }
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57 public int getRevisionCount() {
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58 return content.revisionCount();
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59 }
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60
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61 public int getLocalRevisionNumber(Nodeid nid) {
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62 int revision = content.findLocalRevisionNumber(nid);
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63 if (revision == Integer.MIN_VALUE) {
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64 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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65 }
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66 return revision;
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67 }
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69 // Till now, i follow approach that NULL nodeid is never part of revlog
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70 public boolean isKnown(Nodeid nodeid) {
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71 final int rn = content.findLocalRevisionNumber(nodeid);
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72 if (Integer.MIN_VALUE == rn) {
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73 return false;
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74 }
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75 if (rn < 0 || rn >= content.revisionCount()) {
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76 // Sanity check
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77 throw new IllegalStateException();
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78 }
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79 return true;
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80 }
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82 /**
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83 * 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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84 * @param nodeid
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85 */
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86 public byte[] content(Nodeid nodeid) {
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87 return content(getLocalRevisionNumber(nodeid));
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88 }
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90 /**
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91 * @param revision - repo-local index of this file change (not a changelog revision number!)
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92 */
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93 public byte[] content(int revision) {
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94 final byte[][] dataPtr = new byte[1][];
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95 Revlog.Inspector insp = new Revlog.Inspector() {
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96 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, byte[] data) {
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97 dataPtr[0] = data;
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98 }
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99 };
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100 content.iterate(revision, revision, true, insp);
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101 return dataPtr[0];
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102 }
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103
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104 /**
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105 * XXX perhaps, return value Nodeid[2] and boolean needNodeids is better (and higher level) API for this query?
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106 *
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107 * @param revision - revision to query parents, or {@link HgRepository#TIP}
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108 * @param parentRevisions - int[2] to get local revision numbers of parents (e.g. {6, -1})
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109 * @param parent1 - byte[20] or null, if parent's nodeid is not needed
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110 * @param parent2 - byte[20] or null, if second parent's nodeid is not needed
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111 * @return
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112 */
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113 public void parents(int revision, int[] parentRevisions, byte[] parent1, byte[] parent2) {
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114 if (revision != TIP && !(revision >= 0 && revision < content.revisionCount())) {
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115 throw new IllegalArgumentException(String.valueOf(revision));
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116 }
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117 if (parentRevisions == null || parentRevisions.length < 2) {
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118 throw new IllegalArgumentException(String.valueOf(parentRevisions));
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119 }
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120 if (parent1 != null && parent1.length < 20) {
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121 throw new IllegalArgumentException(parent1.toString());
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122 }
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123 if (parent2 != null && parent2.length < 20) {
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124 throw new IllegalArgumentException(parent2.toString());
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125 }
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126 class ParentCollector implements Revlog.Inspector {
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127 public int p1 = -1;
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128 public int p2 = -1;
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129 public byte[] nodeid;
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130
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131 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, byte[] data) {
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132 p1 = parent1Revision;
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133 p2 = parent2Revision;
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134 this.nodeid = new byte[20];
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135 // nodeid arg now comes in 32 byte from (as in file format description), however upper 12 bytes are zeros.
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136 System.arraycopy(nodeid, nodeid.length > 20 ? nodeid.length - 20 : 0, this.nodeid, 0, 20);
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137 }
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138 };
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139 ParentCollector pc = new ParentCollector();
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140 content.iterate(revision, revision, false, pc);
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141 parentRevisions[0] = pc.p1;
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142 parentRevisions[1] = pc.p2;
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143 if (parent1 != null) {
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144 if (parentRevisions[0] == -1) {
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145 Arrays.fill(parent1, 0, 20, (byte) 0);
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146 } else {
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147 content.iterate(parentRevisions[0], parentRevisions[0], false, pc);
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148 System.arraycopy(pc.nodeid, 0, parent1, 0, 20);
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149 }
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150 }
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151 if (parent2 != null) {
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152 if (parentRevisions[1] == -1) {
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153 Arrays.fill(parent2, 0, 20, (byte) 0);
576d6e8a09f6 Analog of 'hg status --change' command
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154 } else {
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155 content.iterate(parentRevisions[1], parentRevisions[1], false, pc);
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156 System.arraycopy(pc.nodeid, 0, parent2, 0, 20);
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157 }
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158 }
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159 }
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160
22
603806cd2dc6 Status of local working dir against non-tip base revision
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161 // FIXME byte[] data might be too expensive, for few usecases it may be better to have intermediate Access object (when we don't need full data
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162 // instantly - e.g. calculate hash, or comparing two revisions
29
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163 // XXX seems that RevlogStream is better place for this class.
2
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164 public interface Inspector {
3
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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165 // XXX boolean retVal to indicate whether to continue?
24
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166 // TODO specify nodeid and data length, and reuse policy (i.e. if revlog stream doesn't reuse nodeid[] for each call)
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167 void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[/*20*/] nodeid, byte[] data);
2
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diff changeset
168 }
29
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169
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170 /*
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171 * XXX think over if it's better to do either:
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172 * pw = getChangelog().new ParentWalker(); pw.init() and pass pw instance around as needed
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diff changeset
173 * or
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174 * add Revlog#getParentWalker(), static class, make cons() and #init package-local, and keep SoftReference to allow walker reuse.
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diff changeset
175 *
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176 * and yes, walker is not a proper name
6cce719bbb62 Collector for nodes and their parents
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diff changeset
177 */
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178 public final class ParentWalker {
6cce719bbb62 Collector for nodes and their parents
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diff changeset
179 private Map<Nodeid, Nodeid> firstParent;
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diff changeset
180 private Map<Nodeid, Nodeid> secondParent;
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diff changeset
181 private Set<Nodeid> allNodes;
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diff changeset
182
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diff changeset
183 public ParentWalker() {
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diff changeset
184 firstParent = secondParent = Collections.emptyMap();
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diff changeset
185 allNodes = Collections.emptySet();
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diff changeset
186 }
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187
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diff changeset
188 public void init() {
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diff changeset
189 final RevlogStream stream = Revlog.this.content;
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diff changeset
190 final int revisionCount = stream.revisionCount();
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diff changeset
191 firstParent = new HashMap<Nodeid, Nodeid>(revisionCount);
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diff changeset
192 secondParent = new HashMap<Nodeid, Nodeid>(firstParent.size() >> 1); // assume branches/merges are less frequent
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diff changeset
193 allNodes = new LinkedHashSet<Nodeid>();
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diff changeset
194
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diff changeset
195 Inspector insp = new Inspector() {
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diff changeset
196 final Nodeid[] sequentialRevisionNodeids = new Nodeid[revisionCount];
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diff changeset
197 int ix = 0;
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diff changeset
198 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, byte[] data) {
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diff changeset
199 if (ix != revisionNumber) {
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diff changeset
200 // XXX temp code, just to make sure I understand what's going on here
6cce719bbb62 Collector for nodes and their parents
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diff changeset
201 throw new IllegalStateException();
6cce719bbb62 Collector for nodes and their parents
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parents: 24
diff changeset
202 }
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
203 if (parent1Revision >= revisionNumber || parent2Revision >= revisionNumber) {
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
204 throw new IllegalStateException(); // sanity, revisions are sequential
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
205 }
6cce719bbb62 Collector for nodes and their parents
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parents: 24
diff changeset
206 final Nodeid nid = new Nodeid(nodeid, true);
6cce719bbb62 Collector for nodes and their parents
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diff changeset
207 sequentialRevisionNodeids[ix++] = nid;
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
208 allNodes.add(nid);
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
209 if (parent1Revision != -1) {
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
210 firstParent.put(nid, sequentialRevisionNodeids[parent1Revision]);
6cce719bbb62 Collector for nodes and their parents
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parents: 24
diff changeset
211 if (parent2Revision != -1) {
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
212 secondParent.put(nid, sequentialRevisionNodeids[parent2Revision]);
6cce719bbb62 Collector for nodes and their parents
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parents: 24
diff changeset
213 }
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parents: 24
diff changeset
214 }
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parents: 24
diff changeset
215 }
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parents: 24
diff changeset
216 };
6cce719bbb62 Collector for nodes and their parents
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diff changeset
217 stream.iterate(0, -1, false, insp);
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diff changeset
218 }
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parents: 24
diff changeset
219
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diff changeset
220 public Set<Nodeid> allNodes() {
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diff changeset
221 return Collections.unmodifiableSet(allNodes);
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
222 }
31
346b66add79d Basic lookup for incoming changes
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parents: 29
diff changeset
223
346b66add79d Basic lookup for incoming changes
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parents: 29
diff changeset
224 // FIXME need to decide whether Nodeid(00 * 20) is always known or not
346b66add79d Basic lookup for incoming changes
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diff changeset
225 public boolean knownNode(Nodeid nid) {
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diff changeset
226 return allNodes.contains(nid);
346b66add79d Basic lookup for incoming changes
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diff changeset
227 }
29
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diff changeset
228
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diff changeset
229 // null if none
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diff changeset
230 public Nodeid firstParent(Nodeid nid) {
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diff changeset
231 return firstParent.get(nid);
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
232 }
49
26e3eeaa3962 branch and user filtering for log operation
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 39
diff changeset
233
26e3eeaa3962 branch and user filtering for log operation
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 39
diff changeset
234 // never null, Nodeid.NULL if none known
26e3eeaa3962 branch and user filtering for log operation
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parents: 39
diff changeset
235 public Nodeid safeFirstParent(Nodeid nid) {
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parents: 39
diff changeset
236 Nodeid rv = firstParent(nid);
26e3eeaa3962 branch and user filtering for log operation
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 39
diff changeset
237 return rv == null ? Nodeid.NULL : rv;
26e3eeaa3962 branch and user filtering for log operation
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 39
diff changeset
238 }
29
6cce719bbb62 Collector for nodes and their parents
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diff changeset
239
6cce719bbb62 Collector for nodes and their parents
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diff changeset
240 public Nodeid secondParent(Nodeid nid) {
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diff changeset
241 return secondParent.get(nid);
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
242 }
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
243
49
26e3eeaa3962 branch and user filtering for log operation
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 39
diff changeset
244 public Nodeid safeSecondParent(Nodeid nid) {
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 39
diff changeset
245 Nodeid rv = secondParent(nid);
26e3eeaa3962 branch and user filtering for log operation
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 39
diff changeset
246 return rv == null ? Nodeid.NULL : rv;
26e3eeaa3962 branch and user filtering for log operation
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 39
diff changeset
247 }
26e3eeaa3962 branch and user filtering for log operation
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parents: 39
diff changeset
248
29
6cce719bbb62 Collector for nodes and their parents
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diff changeset
249 public boolean appendParentsOf(Nodeid nid, Collection<Nodeid> c) {
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diff changeset
250 Nodeid p1 = firstParent(nid);
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
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diff changeset
251 boolean modified = false;
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parents: 24
diff changeset
252 if (p1 != null) {
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
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diff changeset
253 modified = c.add(p1);
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
254 Nodeid p2 = secondParent(nid);
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
255 if (p2 != null) {
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
256 modified = c.add(p2) || modified;
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
257 }
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
258 }
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
259 return modified;
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
260 }
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
261 }
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
262 }