Mercurial > hg4j

annotate src/com/tmate/hgkit/ll/Revlog.java @ 64:19e9e220bf68

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Convenient commands constitute hi-level API. org.tmatesoft namespace, GPL2 statement
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 21 Jan 2011 05:56:43 +0100
parents 576d6e8a09f6
children
rev   line source
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1 /*
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2 * Copyright (c) 2010, 2011 Artem Tikhomirov
2
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3 */
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4 package com.tmate.hgkit.ll;
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5
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6 import static com.tmate.hgkit.ll.HgRepository.TIP;
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7
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8 import java.util.Arrays;
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9 import java.util.Collection;
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10 import java.util.Collections;
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11 import java.util.HashMap;
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12 import java.util.LinkedHashSet;
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13 import java.util.Map;
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14 import java.util.Set;
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15
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16 /**
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17 *
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18 * @author artem
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19 */
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20 public abstract class Revlog {
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21
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22 private final HgRepository hgRepo;
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23 protected final RevlogStream content;
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25 protected Revlog(HgRepository hgRepo, RevlogStream content) {
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26 if (hgRepo == null) {
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27 throw new NullPointerException();
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28 }
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29 this.hgRepo = hgRepo;
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30 this.content = content;
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31 }
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32
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33 public final HgRepository getRepo() {
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34 return hgRepo;
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35 }
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36
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37 public int getRevisionCount() {
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38 return content.revisionCount();
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39 }
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40
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41 public int getLocalRevisionNumber(Nodeid nid) {
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42 int revision = content.findLocalRevisionNumber(nid);
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43 if (revision == Integer.MIN_VALUE) {
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44 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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45 }
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46 return revision;
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47 }
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48
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49 // Till now, i follow approach that NULL nodeid is never part of revlog
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50 public boolean isKnown(Nodeid nodeid) {
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51 final int rn = content.findLocalRevisionNumber(nodeid);
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52 if (Integer.MIN_VALUE == rn) {
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53 return false;
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54 }
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55 if (rn < 0 || rn >= content.revisionCount()) {
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56 // Sanity check
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57 throw new IllegalStateException();
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58 }
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59 return true;
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60 }
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62 /**
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63 * 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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64 * @param nodeid
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65 */
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66 public byte[] content(Nodeid nodeid) {
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67 return content(getLocalRevisionNumber(nodeid));
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68 }
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69
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70 /**
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71 * @param revision - repo-local index of this file change (not a changelog revision number!)
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72 */
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73 public byte[] content(int revision) {
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74 final byte[][] dataPtr = new byte[1][];
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75 Revlog.Inspector insp = new Revlog.Inspector() {
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76 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, byte[] data) {
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77 dataPtr[0] = data;
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78 }
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79 };
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80 content.iterate(revision, revision, true, insp);
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81 return dataPtr[0];
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82 }
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83
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84 /**
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85 * XXX perhaps, return value Nodeid[2] and boolean needNodeids is better (and higher level) API for this query?
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86 *
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87 * @param revision - revision to query parents, or {@link HgRepository#TIP}
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88 * @param parentRevisions - int[2] to get local revision numbers of parents (e.g. {6, -1})
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89 * @param parent1 - byte[20] or null, if parent's nodeid is not needed
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90 * @param parent2 - byte[20] or null, if second parent's nodeid is not needed
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91 * @return
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92 */
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93 public void parents(int revision, int[] parentRevisions, byte[] parent1, byte[] parent2) {
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94 if (revision != TIP && !(revision >= 0 && revision < content.revisionCount())) {
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95 throw new IllegalArgumentException(String.valueOf(revision));
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96 }
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97 if (parentRevisions == null || parentRevisions.length < 2) {
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98 throw new IllegalArgumentException(String.valueOf(parentRevisions));
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99 }
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100 if (parent1 != null && parent1.length < 20) {
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101 throw new IllegalArgumentException(parent1.toString());
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102 }
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103 if (parent2 != null && parent2.length < 20) {
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104 throw new IllegalArgumentException(parent2.toString());
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105 }
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106 class ParentCollector implements Revlog.Inspector {
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107 public int p1 = -1;
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108 public int p2 = -1;
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109 public byte[] nodeid;
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110
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111 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, byte[] data) {
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112 p1 = parent1Revision;
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113 p2 = parent2Revision;
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114 this.nodeid = new byte[20];
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115 // nodeid arg now comes in 32 byte from (as in file format description), however upper 12 bytes are zeros.
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116 System.arraycopy(nodeid, nodeid.length > 20 ? nodeid.length - 20 : 0, this.nodeid, 0, 20);
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117 }
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118 };
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119 ParentCollector pc = new ParentCollector();
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120 content.iterate(revision, revision, false, pc);
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121 parentRevisions[0] = pc.p1;
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122 parentRevisions[1] = pc.p2;
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123 if (parent1 != null) {
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124 if (parentRevisions[0] == -1) {
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125 Arrays.fill(parent1, 0, 20, (byte) 0);
576d6e8a09f6 Analog of 'hg status --change' command
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126 } else {
576d6e8a09f6 Analog of 'hg status --change' command
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127 content.iterate(parentRevisions[0], parentRevisions[0], false, pc);
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128 System.arraycopy(pc.nodeid, 0, parent1, 0, 20);
576d6e8a09f6 Analog of 'hg status --change' command
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129 }
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130 }
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131 if (parent2 != null) {
576d6e8a09f6 Analog of 'hg status --change' command
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132 if (parentRevisions[1] == -1) {
576d6e8a09f6 Analog of 'hg status --change' command
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133 Arrays.fill(parent2, 0, 20, (byte) 0);
576d6e8a09f6 Analog of 'hg status --change' command
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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134 } else {
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135 content.iterate(parentRevisions[1], parentRevisions[1], false, pc);
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136 System.arraycopy(pc.nodeid, 0, parent2, 0, 20);
576d6e8a09f6 Analog of 'hg status --change' command
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137 }
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
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138 }
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
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139 }
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140
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141 // 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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142 // instantly - e.g. calculate hash, or comparing two revisions
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143 // XXX seems that RevlogStream is better place for this class.
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144 public interface Inspector {
3
24bb4f365164 Rudimentary log functionality with basic infrastructure is in place
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145 // XXX boolean retVal to indicate whether to continue?
24
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146 // 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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147 void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[/*20*/] nodeid, byte[] data);
2
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148 }
29
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149
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150 /*
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151 * XXX think over if it's better to do either:
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152 * pw = getChangelog().new ParentWalker(); pw.init() and pass pw instance around as needed
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diff changeset
153 * or
6cce719bbb62 Collector for nodes and their parents
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parents: 24
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154 * add Revlog#getParentWalker(), static class, make cons() and #init package-local, and keep SoftReference to allow walker reuse.
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diff changeset
155 *
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
156 * and yes, walker is not a proper name
6cce719bbb62 Collector for nodes and their parents
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parents: 24
diff changeset
157 */
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158 public final class ParentWalker {
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diff changeset
159 private Map<Nodeid, Nodeid> firstParent;
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diff changeset
160 private Map<Nodeid, Nodeid> secondParent;
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parents: 24
diff changeset
161 private Set<Nodeid> allNodes;
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diff changeset
162
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diff changeset
163 public ParentWalker() {
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parents: 24
diff changeset
164 firstParent = secondParent = Collections.emptyMap();
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parents: 24
diff changeset
165 allNodes = Collections.emptySet();
6cce719bbb62 Collector for nodes and their parents
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diff changeset
166 }
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parents: 24
diff changeset
167
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diff changeset
168 public void init() {
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diff changeset
169 final RevlogStream stream = Revlog.this.content;
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diff changeset
170 final int revisionCount = stream.revisionCount();
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parents: 24
diff changeset
171 firstParent = new HashMap<Nodeid, Nodeid>(revisionCount);
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parents: 24
diff changeset
172 secondParent = new HashMap<Nodeid, Nodeid>(firstParent.size() >> 1); // assume branches/merges are less frequent
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parents: 24
diff changeset
173 allNodes = new LinkedHashSet<Nodeid>();
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parents: 24
diff changeset
174
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parents: 24
diff changeset
175 Inspector insp = new Inspector() {
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parents: 24
diff changeset
176 final Nodeid[] sequentialRevisionNodeids = new Nodeid[revisionCount];
6cce719bbb62 Collector for nodes and their parents
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parents: 24
diff changeset
177 int ix = 0;
6cce719bbb62 Collector for nodes and their parents
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parents: 24
diff changeset
178 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, byte[] data) {
6cce719bbb62 Collector for nodes and their parents
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parents: 24
diff changeset
179 if (ix != revisionNumber) {
6cce719bbb62 Collector for nodes and their parents
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parents: 24
diff changeset
180 // 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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parents: 24
diff changeset
181 throw new IllegalStateException();
6cce719bbb62 Collector for nodes and their parents
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parents: 24
diff changeset
182 }
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
183 if (parent1Revision >= revisionNumber || parent2Revision >= revisionNumber) {
6cce719bbb62 Collector for nodes and their parents
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parents: 24
diff changeset
184 throw new IllegalStateException(); // sanity, revisions are sequential
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
185 }
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parents: 24
diff changeset
186 final Nodeid nid = new Nodeid(nodeid, true);
6cce719bbb62 Collector for nodes and their parents
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diff changeset
187 sequentialRevisionNodeids[ix++] = nid;
6cce719bbb62 Collector for nodes and their parents
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parents: 24
diff changeset
188 allNodes.add(nid);
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
189 if (parent1Revision != -1) {
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
190 firstParent.put(nid, sequentialRevisionNodeids[parent1Revision]);
6cce719bbb62 Collector for nodes and their parents
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parents: 24
diff changeset
191 if (parent2Revision != -1) {
6cce719bbb62 Collector for nodes and their parents
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parents: 24
diff changeset
192 secondParent.put(nid, sequentialRevisionNodeids[parent2Revision]);
6cce719bbb62 Collector for nodes and their parents
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parents: 24
diff changeset
193 }
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parents: 24
diff changeset
194 }
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195 }
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diff changeset
196 };
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diff changeset
197 stream.iterate(0, -1, false, insp);
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diff changeset
198 }
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199
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diff changeset
200 public Set<Nodeid> allNodes() {
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diff changeset
201 return Collections.unmodifiableSet(allNodes);
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
202 }
31
346b66add79d Basic lookup for incoming changes
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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diff changeset
203
346b66add79d Basic lookup for incoming changes
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parents: 29
diff changeset
204 // 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
205 public boolean knownNode(Nodeid nid) {
346b66add79d Basic lookup for incoming changes
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diff changeset
206 return allNodes.contains(nid);
346b66add79d Basic lookup for incoming changes
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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diff changeset
207 }
29
6cce719bbb62 Collector for nodes and their parents
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parents: 24
diff changeset
208
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209 // null if none
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diff changeset
210 public Nodeid firstParent(Nodeid nid) {
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diff changeset
211 return firstParent.get(nid);
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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diff changeset
212 }
49
26e3eeaa3962 branch and user filtering for log operation
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 39
diff changeset
213
26e3eeaa3962 branch and user filtering for log operation
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parents: 39
diff changeset
214 // never null, Nodeid.NULL if none known
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parents: 39
diff changeset
215 public Nodeid safeFirstParent(Nodeid nid) {
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diff changeset
216 Nodeid rv = firstParent(nid);
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 39
diff changeset
217 return rv == null ? Nodeid.NULL : rv;
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parents: 39
diff changeset
218 }
29
6cce719bbb62 Collector for nodes and their parents
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diff changeset
219
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220 public Nodeid secondParent(Nodeid nid) {
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diff changeset
221 return secondParent.get(nid);
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parents: 24
diff changeset
222 }
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parents: 24
diff changeset
223
49
26e3eeaa3962 branch and user filtering for log operation
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parents: 39
diff changeset
224 public Nodeid safeSecondParent(Nodeid nid) {
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parents: 39
diff changeset
225 Nodeid rv = secondParent(nid);
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parents: 39
diff changeset
226 return rv == null ? Nodeid.NULL : rv;
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parents: 39
diff changeset
227 }
26e3eeaa3962 branch and user filtering for log operation
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parents: 39
diff changeset
228
29
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diff changeset
229 public boolean appendParentsOf(Nodeid nid, Collection<Nodeid> c) {
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diff changeset
230 Nodeid p1 = firstParent(nid);
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diff changeset
231 boolean modified = false;
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diff changeset
232 if (p1 != null) {
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
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diff changeset
233 modified = c.add(p1);
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
234 Nodeid p2 = secondParent(nid);
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parents: 24
diff changeset
235 if (p2 != null) {
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parents: 24
diff changeset
236 modified = c.add(p2) || modified;
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parents: 24
diff changeset
237 }
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parents: 24
diff changeset
238 }
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
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diff changeset
239 return modified;
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parents: 24
diff changeset
240 }
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
241 }
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
242 }