Mercurial > jhg

annotate src/com/tmate/hgkit/ll/Revlog.java @ 51:9429c7bd1920 wrap-data-access

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Try DataAccess to reach revision data instead of plain byte arrays
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Sun, 16 Jan 2011 01:20:26 +0100
parents 26e3eeaa3962
children
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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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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13 import com.tmate.hgkit.fs.DataAccess;
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14
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15 /**
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16 *
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17 * @author artem
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18 */
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19 public abstract class Revlog {
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20
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21 private final HgRepository hgRepo;
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22 protected final RevlogStream content;
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24 protected Revlog(HgRepository hgRepo, RevlogStream content) {
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25 if (hgRepo == null) {
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26 throw new NullPointerException();
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27 }
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28 this.hgRepo = hgRepo;
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29 this.content = content;
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30 }
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32 public final HgRepository getRepo() {
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33 return hgRepo;
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34 }
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35
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36 public int getRevisionCount() {
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37 return content.revisionCount();
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38 }
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39
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40 public int getLocalRevisionNumber(Nodeid nid) {
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41 int revision = content.findLocalRevisionNumber(nid);
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42 if (revision == Integer.MIN_VALUE) {
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43 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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44 }
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45 return revision;
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46 }
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47
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48 // Till now, i follow approach that NULL nodeid is never part of revlog
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49 public boolean isKnown(Nodeid nodeid) {
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50 final int rn = content.findLocalRevisionNumber(nodeid);
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51 if (Integer.MIN_VALUE == rn) {
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52 return false;
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53 }
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54 if (rn < 0 || rn >= content.revisionCount()) {
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55 // Sanity check
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56 throw new IllegalStateException();
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57 }
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58 return true;
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59 }
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61 /**
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62 * 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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63 * @param nodeid
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64 */
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65 public byte[] content(Nodeid nodeid) {
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66 return content(getLocalRevisionNumber(nodeid));
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67 }
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69 /**
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70 * @param revision - repo-local index of this file change (not a changelog revision number!)
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71 */
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72 public byte[] content(int revision) {
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73 final byte[][] dataPtr = new byte[1][];
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74 Revlog.Inspector insp = new Revlog.Inspector() {
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75 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) {
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76 dataPtr[0] = data.byteArray();
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77 }
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78 };
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79 content.iterate(revision, revision, true, insp);
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80 return dataPtr[0];
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81 }
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82
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83 // 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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84 // instantly - e.g. calculate hash, or comparing two revisions
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85 // XXX seems that RevlogStream is better place for this class.
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86 public interface Inspector {
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87 // XXX boolean retVal to indicate whether to continue?
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88 // 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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89 void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[/*20*/] nodeid, DataAccess data);
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90 }
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91
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92 /*
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93 * XXX think over if it's better to do either:
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94 * pw = getChangelog().new ParentWalker(); pw.init() and pass pw instance around as needed
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95 * or
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96 * add Revlog#getParentWalker(), static class, make cons() and #init package-local, and keep SoftReference to allow walker reuse.
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97 *
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98 * and yes, walker is not a proper name
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99 */
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100 public final class ParentWalker {
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101 private Map<Nodeid, Nodeid> firstParent;
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102 private Map<Nodeid, Nodeid> secondParent;
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103 private Set<Nodeid> allNodes;
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104
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105 public ParentWalker() {
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106 firstParent = secondParent = Collections.emptyMap();
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107 allNodes = Collections.emptySet();
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108 }
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109
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110 public void init() {
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111 final RevlogStream stream = Revlog.this.content;
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112 final int revisionCount = stream.revisionCount();
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113 firstParent = new HashMap<Nodeid, Nodeid>(revisionCount);
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114 secondParent = new HashMap<Nodeid, Nodeid>(firstParent.size() >> 1); // assume branches/merges are less frequent
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115 allNodes = new LinkedHashSet<Nodeid>();
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116
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117 Inspector insp = new Inspector() {
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118 final Nodeid[] sequentialRevisionNodeids = new Nodeid[revisionCount];
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119 int ix = 0;
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120 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) {
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121 if (ix != revisionNumber) {
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122 // XXX temp code, just to make sure I understand what's going on here
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123 throw new IllegalStateException();
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124 }
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125 if (parent1Revision >= revisionNumber || parent2Revision >= revisionNumber) {
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
126 throw new IllegalStateException(); // sanity, revisions are sequential
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
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127 }
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
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128 final Nodeid nid = new Nodeid(nodeid, true);
6cce719bbb62 Collector for nodes and their parents
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parents: 24
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129 sequentialRevisionNodeids[ix++] = nid;
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
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130 allNodes.add(nid);
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
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131 if (parent1Revision != -1) {
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
132 firstParent.put(nid, sequentialRevisionNodeids[parent1Revision]);
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
133 if (parent2Revision != -1) {
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
134 secondParent.put(nid, sequentialRevisionNodeids[parent2Revision]);
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
135 }
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
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137 }
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 stream.iterate(0, -1, false, insp);
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
140 }
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
141
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
142 public Set<Nodeid> allNodes() {
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
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143 return Collections.unmodifiableSet(allNodes);
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
144 }
31
346b66add79d Basic lookup for incoming changes
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 29
diff changeset
145
346b66add79d Basic lookup for incoming changes
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 29
diff changeset
146 // FIXME need to decide whether Nodeid(00 * 20) is always known or not
346b66add79d Basic lookup for incoming changes
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parents: 29
diff changeset
147 public boolean knownNode(Nodeid nid) {
346b66add79d Basic lookup for incoming changes
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 29
diff changeset
148 return allNodes.contains(nid);
346b66add79d Basic lookup for incoming changes
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 29
diff changeset
149 }
29
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
150
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
151 // null if none
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
152 public Nodeid firstParent(Nodeid nid) {
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
153 return firstParent.get(nid);
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
154 }
49
26e3eeaa3962 branch and user filtering for log operation
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 39
diff changeset
155
26e3eeaa3962 branch and user filtering for log operation
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 39
diff changeset
156 // never null, Nodeid.NULL if none known
26e3eeaa3962 branch and user filtering for log operation
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 39
diff changeset
157 public Nodeid safeFirstParent(Nodeid nid) {
26e3eeaa3962 branch and user filtering for log operation
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 39
diff changeset
158 Nodeid rv = firstParent(nid);
26e3eeaa3962 branch and user filtering for log operation
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 39
diff changeset
159 return rv == null ? Nodeid.NULL : rv;
26e3eeaa3962 branch and user filtering for log operation
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 39
diff changeset
160 }
29
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
161
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
162 public Nodeid secondParent(Nodeid nid) {
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
163 return secondParent.get(nid);
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
164 }
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
165
49
26e3eeaa3962 branch and user filtering for log operation
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 39
diff changeset
166 public Nodeid safeSecondParent(Nodeid nid) {
26e3eeaa3962 branch and user filtering for log operation
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 39
diff changeset
167 Nodeid rv = secondParent(nid);
26e3eeaa3962 branch and user filtering for log operation
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 39
diff changeset
168 return rv == null ? Nodeid.NULL : rv;
26e3eeaa3962 branch and user filtering for log operation
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 39
diff changeset
169 }
26e3eeaa3962 branch and user filtering for log operation
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 39
diff changeset
170
29
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
171 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
172 Nodeid p1 = firstParent(nid);
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
173 boolean modified = false;
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
174 if (p1 != null) {
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
175 modified = c.add(p1);
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
176 Nodeid p2 = secondParent(nid);
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
177 if (p2 != null) {
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
178 modified = c.add(p2) || modified;
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
179 }
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
180 }
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
181 return modified;
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
182 }
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
183 }
2
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
184 }