Mercurial > jhg

annotate src/com/tmate/hgkit/ll/Revlog.java @ 46:4022c34a4804

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Better hashCode impl
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 14 Jan 2011 04:56:53 +0100
parents 4e9b66b07a28
children 26e3eeaa3962
rev   line source
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1 /*
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2 * Copyright (c) 2010, 2011 Artem Tikhomirov
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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
39
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38 // Till now, i follow approach that NULL nodeid is never part of revlog
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39 public boolean isKnown(Nodeid nodeid) {
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40 try {
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41 int revision = content.findLocalRevisionNumber(nodeid);
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42 return revision >= 0 && revision < getRevisionCount();
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43 } catch (IllegalArgumentException ex) {
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44 // FIXME bad way to figure out if nodeid is from this revlog
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45 return false;
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46 }
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47 }
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48 /**
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49 * 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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50 * @param nodeid
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51 */
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52 public byte[] content(Nodeid nodeid) {
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53 int revision = content.findLocalRevisionNumber(nodeid);
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54 return content(revision);
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55 }
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57 /**
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58 * @param revision - repo-local index of this file change (not a changelog revision number!)
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59 */
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60 public byte[] content(int revision) {
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61 final byte[][] dataPtr = new byte[1][];
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62 Revlog.Inspector insp = new Revlog.Inspector() {
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63 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, byte[] data) {
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64 dataPtr[0] = data;
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65 }
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66 };
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67 content.iterate(revision, revision, true, insp);
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68 return dataPtr[0];
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69 }
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70
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71 // 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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72 // instantly - e.g. calculate hash, or comparing two revisions
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73 // XXX seems that RevlogStream is better place for this class.
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74 public interface Inspector {
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75 // XXX boolean retVal to indicate whether to continue?
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76 // 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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77 void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[/*20*/] nodeid, byte[] data);
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78 }
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79
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80 /*
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81 * XXX think over if it's better to do either:
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82 * pw = getChangelog().new ParentWalker(); pw.init() and pass pw instance around as needed
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83 * or
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84 * add Revlog#getParentWalker(), static class, make cons() and #init package-local, and keep SoftReference to allow walker reuse.
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85 *
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86 * and yes, walker is not a proper name
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87 */
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88 public final class ParentWalker {
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89 private Map<Nodeid, Nodeid> firstParent;
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90 private Map<Nodeid, Nodeid> secondParent;
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91 private Set<Nodeid> allNodes;
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92
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93 public ParentWalker() {
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94 firstParent = secondParent = Collections.emptyMap();
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95 allNodes = Collections.emptySet();
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96 }
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97
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98 public void init() {
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99 final RevlogStream stream = Revlog.this.content;
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100 final int revisionCount = stream.revisionCount();
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101 firstParent = new HashMap<Nodeid, Nodeid>(revisionCount);
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102 secondParent = new HashMap<Nodeid, Nodeid>(firstParent.size() >> 1); // assume branches/merges are less frequent
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103 allNodes = new LinkedHashSet<Nodeid>();
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104
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105 Inspector insp = new Inspector() {
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106 final Nodeid[] sequentialRevisionNodeids = new Nodeid[revisionCount];
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107 int ix = 0;
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108 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, byte[] data) {
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109 if (ix != revisionNumber) {
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110 // XXX temp code, just to make sure I understand what's going on here
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111 throw new IllegalStateException();
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112 }
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113 if (parent1Revision >= revisionNumber || parent2Revision >= revisionNumber) {
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114 throw new IllegalStateException(); // sanity, revisions are sequential
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115 }
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116 final Nodeid nid = new Nodeid(nodeid, true);
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117 sequentialRevisionNodeids[ix++] = nid;
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118 allNodes.add(nid);
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119 if (parent1Revision != -1) {
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120 firstParent.put(nid, sequentialRevisionNodeids[parent1Revision]);
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121 if (parent2Revision != -1) {
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122 secondParent.put(nid, sequentialRevisionNodeids[parent2Revision]);
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123 }
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124 }
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
125 }
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
126 };
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
127 stream.iterate(0, -1, false, insp);
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
128 }
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
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129
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
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130 public Set<Nodeid> allNodes() {
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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131 return Collections.unmodifiableSet(allNodes);
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
132 }
31
346b66add79d Basic lookup for incoming changes
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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133
346b66add79d Basic lookup for incoming changes
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 29
diff changeset
134 // FIXME need to decide whether Nodeid(00 * 20) is always known or not
346b66add79d Basic lookup for incoming changes
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 29
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135 public boolean knownNode(Nodeid nid) {
346b66add79d Basic lookup for incoming changes
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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diff changeset
136 return allNodes.contains(nid);
346b66add79d Basic lookup for incoming changes
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 29
diff changeset
137 }
29
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
138
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
139 // null if none
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
140 public Nodeid firstParent(Nodeid nid) {
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
141 return firstParent.get(nid);
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
142 }
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
143
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
144 public Nodeid secondParent(Nodeid nid) {
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
145 return secondParent.get(nid);
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 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
149 Nodeid p1 = firstParent(nid);
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
150 boolean modified = false;
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
151 if (p1 != null) {
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
152 modified = c.add(p1);
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
153 Nodeid p2 = secondParent(nid);
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
154 if (p2 != null) {
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
155 modified = c.add(p2) || modified;
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
156 }
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
157 }
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
158 return modified;
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
159 }
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
160 }
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
161 }