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annotate src/org/tmatesoft/hg/internal/ManifestRevision.java @ 288:b11f6a08f748

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Avoid boxing int values and list resizes on revlog read
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Sat, 10 Sep 2011 00:18:39 +0200
parents 6dbbc53fc46d
children ee8264d80747
rev   line source
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1 /*
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2 * Copyright (c) 2011 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
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15 * contact TMate Software at support@hg4j.com
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16 */
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17 package org.tmatesoft.hg.internal;
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19 import java.util.Collection;
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20 import java.util.TreeMap;
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21
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22 import org.tmatesoft.hg.core.HgBadStateException;
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23 import org.tmatesoft.hg.core.Nodeid;
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24 import org.tmatesoft.hg.repo.HgManifest;
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25 import org.tmatesoft.hg.util.Path;
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26
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27 /**
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28 * Specific revision of the manifest.
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29 * Note, suited to keep single revision only ({@link #changeset()}).
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30 *
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31 * @author Artem Tikhomirov
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32 * @author TMate Software Ltd.
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33 */
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34 public final class ManifestRevision implements HgManifest.Inspector2 {
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35 private final TreeMap<Path, Nodeid> idsMap;
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36 private final TreeMap<Path, HgManifest.Flags> flagsMap;
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37 private final Pool<Nodeid> idsPool;
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38 private final Pool<Path> namesPool;
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39 private Nodeid changeset;
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40 private int changelogRev;
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41
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42 // optional pools for effective management of nodeids and filenames (they are likely
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43 // to be duplicated among different manifest revisions
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44 public ManifestRevision(Pool<Nodeid> nodeidPool, Pool<Path> filenamePool) {
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45 idsPool = nodeidPool;
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46 namesPool = filenamePool;
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47 idsMap = new TreeMap<Path, Nodeid>();
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48 flagsMap = new TreeMap<Path, HgManifest.Flags>();
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49 }
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50
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51 public Collection<Path> files() {
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52 return idsMap.keySet();
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53 }
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54
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55 public Nodeid nodeid(Path fname) {
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56 return idsMap.get(fname);
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57 }
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58
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59 public HgManifest.Flags flags(Path fname) {
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60 return flagsMap.get(fname);
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61 }
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63 /**
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64 * @return identifier of the changeset this manifest revision corresponds to.
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65 */
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66 public Nodeid changeset() {
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67 return changeset;
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68 }
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69
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70 public int changesetLocalRev() {
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71 return changelogRev;
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72 }
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74 //
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75
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76 public boolean next(Nodeid nid, String fname, String flags) {
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77 throw new HgBadStateException(HgManifest.Inspector2.class.getName());
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78 }
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79
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80 public boolean next(Nodeid nid, Path fname, HgManifest.Flags flags) {
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81 if (namesPool != null) {
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82 fname = namesPool.unify(fname);
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83 }
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84 if (idsPool != null) {
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85 nid = idsPool.unify(nid);
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86 }
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87 idsMap.put(fname, nid);
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88 if (flags != null) {
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89 // TreeMap$Entry takes 32 bytes. No reason to keep null for such price
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90 // Alternatively, Map<Path, Pair<Nodeid, Flags>> might come as a solution
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91 // however, with low rate of elements with flags this would consume more memory
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92 // than two distinct maps (sizeof(Pair) == 16).
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93 // Map<Pair>: n*(32+16)
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94 // 2 Maps: n*32 + m*32 <-- consumes more with m>n/2
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95 flagsMap.put(fname, flags);
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96 }
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97 return true;
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98 }
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99
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100 public boolean end(int revision) {
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101 // in fact, this class cares about single revision
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102 return false;
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103 }
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104
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105 public boolean begin(int revision, Nodeid nid, int changelogRevision) {
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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106 if (changeset != null) {
3fbfce107f94 Issue 8: Means to find out information about given file at specific changeset. Inner ManifestRevisionInspector got promoted to ManifestRevision
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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107 idsMap.clear();
3fbfce107f94 Issue 8: Means to find out information about given file at specific changeset. Inner ManifestRevisionInspector got promoted to ManifestRevision
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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108 flagsMap.clear();
3fbfce107f94 Issue 8: Means to find out information about given file at specific changeset. Inner ManifestRevisionInspector got promoted to ManifestRevision
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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109 }
3fbfce107f94 Issue 8: Means to find out information about given file at specific changeset. Inner ManifestRevisionInspector got promoted to ManifestRevision
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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110 changeset = nid;
3fbfce107f94 Issue 8: Means to find out information about given file at specific changeset. Inner ManifestRevisionInspector got promoted to ManifestRevision
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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111 changelogRev = changelogRevision;
3fbfce107f94 Issue 8: Means to find out information about given file at specific changeset. Inner ManifestRevisionInspector got promoted to ManifestRevision
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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112 return true;
3fbfce107f94 Issue 8: Means to find out information about given file at specific changeset. Inner ManifestRevisionInspector got promoted to ManifestRevision
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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113 }
3fbfce107f94 Issue 8: Means to find out information about given file at specific changeset. Inner ManifestRevisionInspector got promoted to ManifestRevision
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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114 }