Mercurial > jhg

annotate src/com/tmate/hgkit/ll/Revlog.java @ 37:e45e75e22523

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Parse changesets from bundle's changelog group. Refactor Revlog to provide access to revision's raw content
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 14 Jan 2011 00:49:58 +0100
parents 346b66add79d
children 4e9b66b07a28
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 java.util.Collection;
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7 import java.util.Collections;
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8 import java.util.HashMap;
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9 import java.util.LinkedHashSet;
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10 import java.util.Map;
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11 import java.util.Set;
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12
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13 /**
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14 *
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15 * @author artem
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16 */
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17 public abstract class Revlog {
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18
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19 private final HgRepository hgRepo;
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20 protected final RevlogStream content;
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22 protected Revlog(HgRepository hgRepo, RevlogStream content) {
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23 if (hgRepo == null) {
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24 throw new NullPointerException();
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25 }
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26 this.hgRepo = hgRepo;
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27 this.content = content;
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28 }
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30 public final HgRepository getRepo() {
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31 return hgRepo;
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32 }
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33
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34 public int getRevisionCount() {
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35 return content.revisionCount();
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36 }
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37
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38 /**
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39 * 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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40 * @param nodeid
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41 */
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42 public byte[] content(Nodeid nodeid) {
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43 int revision = content.findLocalRevisionNumber(nodeid);
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44 return content(revision);
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45 }
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46
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47 /**
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48 * @param revision - repo-local index of this file change (not a changelog revision number!)
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49 */
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50 public byte[] content(int revision) {
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51 final byte[][] dataPtr = new byte[1][];
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52 Revlog.Inspector insp = new Revlog.Inspector() {
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53 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, byte[] data) {
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54 dataPtr[0] = data;
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55 }
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56 };
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57 content.iterate(revision, revision, true, insp);
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58 return dataPtr[0];
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59 }
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60
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61 // 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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62 // instantly - e.g. calculate hash, or comparing two revisions
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63 // XXX seems that RevlogStream is better place for this class.
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64 public interface Inspector {
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65 // XXX boolean retVal to indicate whether to continue?
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66 // 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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67 void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[/*20*/] nodeid, byte[] data);
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68 }
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69
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70 /*
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71 * XXX think over if it's better to do either:
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72 * pw = getChangelog().new ParentWalker(); pw.init() and pass pw instance around as needed
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73 * or
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74 * add Revlog#getParentWalker(), static class, make cons() and #init package-local, and keep SoftReference to allow walker reuse.
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75 *
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76 * and yes, walker is not a proper name
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77 */
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78 public final class ParentWalker {
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79 private Map<Nodeid, Nodeid> firstParent;
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80 private Map<Nodeid, Nodeid> secondParent;
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81 private Set<Nodeid> allNodes;
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82
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83 public ParentWalker() {
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84 firstParent = secondParent = Collections.emptyMap();
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85 allNodes = Collections.emptySet();
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86 }
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87
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88 public void init() {
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89 final RevlogStream stream = Revlog.this.content;
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90 final int revisionCount = stream.revisionCount();
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91 firstParent = new HashMap<Nodeid, Nodeid>(revisionCount);
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92 secondParent = new HashMap<Nodeid, Nodeid>(firstParent.size() >> 1); // assume branches/merges are less frequent
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93 allNodes = new LinkedHashSet<Nodeid>();
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94
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95 Inspector insp = new Inspector() {
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96 final Nodeid[] sequentialRevisionNodeids = new Nodeid[revisionCount];
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97 int ix = 0;
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98 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, byte[] data) {
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99 if (ix != revisionNumber) {
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100 // XXX temp code, just to make sure I understand what's going on here
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101 throw new IllegalStateException();
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102 }
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103 if (parent1Revision >= revisionNumber || parent2Revision >= revisionNumber) {
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104 throw new IllegalStateException(); // sanity, revisions are sequential
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105 }
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106 final Nodeid nid = new Nodeid(nodeid, true);
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107 sequentialRevisionNodeids[ix++] = nid;
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108 allNodes.add(nid);
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109 if (parent1Revision != -1) {
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110 firstParent.put(nid, sequentialRevisionNodeids[parent1Revision]);
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111 if (parent2Revision != -1) {
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112 secondParent.put(nid, sequentialRevisionNodeids[parent2Revision]);
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113 }
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114 }
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115 }
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116 };
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117 stream.iterate(0, -1, false, insp);
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118 }
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119
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120 public Set<Nodeid> allNodes() {
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121 return Collections.unmodifiableSet(allNodes);
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122 }
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123
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124 // FIXME need to decide whether Nodeid(00 * 20) is always known or not
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125 public boolean knownNode(Nodeid nid) {
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126 return allNodes.contains(nid);
346b66add79d Basic lookup for incoming changes
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 29
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127 }
29
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
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128
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
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129 // null if none
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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130 public Nodeid firstParent(Nodeid nid) {
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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131 return firstParent.get(nid);
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
132 }
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
133
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
134 public Nodeid secondParent(Nodeid nid) {
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
135 return secondParent.get(nid);
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
136 }
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
137
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
138 public boolean appendParentsOf(Nodeid nid, Collection<Nodeid> c) {
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
139 Nodeid p1 = firstParent(nid);
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
140 boolean modified = false;
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
141 if (p1 != null) {
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
142 modified = c.add(p1);
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
143 Nodeid p2 = secondParent(nid);
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
144 if (p2 != null) {
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
145 modified = c.add(p2) || modified;
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
146 }
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
147 }
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
148 return modified;
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
149 }
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
150 }
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
151 }