Mercurial > hg4j

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

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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 }