Mercurial > hg4j

annotate src/com/tmate/hgkit/ll/HgDataFile.java @ 52:30bd38978846

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brief explanation of patch record
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Sun, 16 Jan 2011 01:30:18 +0100
parents 26e3eeaa3962
children 9429c7bd1920 576d6e8a09f6
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 static com.tmate.hgkit.ll.HgRepository.TIP;
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7
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8 import java.util.Arrays;
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9
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10 /**
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11 * Extends Revlog/uses RevlogStream?
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12 * ? name:HgFileNode?
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13 * @author artem
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14 */
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15 public class HgDataFile extends Revlog {
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16
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17 // absolute from repo root?
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18 // slashes, unix-style?
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19 // repo location agnostic, just to give info to user, not to access real storage
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20 private final String path;
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22 /*package-local*/HgDataFile(HgRepository hgRepo, String path, RevlogStream content) {
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23 super(hgRepo, content);
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24 this.path = path;
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25 }
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26
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27 public boolean exists() {
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28 return content != null; // XXX need better impl
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29 }
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30
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31 public String getPath() {
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32 return path; // hgRepo.backresolve(this) -> name?
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33 }
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34
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35 public int length(Nodeid nodeid) {
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36 return content.dataLength(getLocalRevisionNumber(nodeid));
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37 }
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38
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39 public byte[] content() {
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40 return content(TIP);
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41 }
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42
3
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43 public void history(Changeset.Inspector inspector) {
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44 history(0, content.revisionCount() - 1, inspector);
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45 }
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46
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47 public void history(int start, int end, Changeset.Inspector inspector) {
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48 if (!exists()) {
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49 throw new IllegalStateException("Can't get history of invalid repository file node");
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50 }
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51 final int[] commitRevisions = new int[end - start + 1];
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52 Revlog.Inspector insp = new Revlog.Inspector() {
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53 int count = 0;
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54
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55 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, byte[] data) {
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56 commitRevisions[count++] = linkRevision;
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57 }
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58 };
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59 content.iterate(start, end, false, insp);
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60 getRepo().getChangelog().range(inspector, commitRevisions);
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61 }
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62
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63 /**
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64 * XXX perhaps, return value Nodeid[2] and boolean needNodeids is better (and higher level) API for this query?
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65 *
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66 * @param revision - revision to query parents, or {@link HgRepository#TIP}
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67 * @param parentRevisions - int[2] to get local revision numbers of parents (e.g. {6, -1})
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68 * @param parent1 - byte[20] or null, if parent's nodeid is not needed
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69 * @param parent2 - byte[20] or null, if second parent's nodeid is not needed
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70 * @return
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71 */
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72 public void parents(int revision, int[] parentRevisions, byte[] parent1, byte[] parent2) {
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73 if (revision != TIP && !(revision >= 0 && revision < content.revisionCount())) {
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74 throw new IllegalArgumentException(String.valueOf(revision));
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75 }
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76 if (parentRevisions == null || parentRevisions.length < 2) {
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77 throw new IllegalArgumentException(String.valueOf(parentRevisions));
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78 }
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79 if (parent1 != null && parent1.length < 20) {
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80 throw new IllegalArgumentException(parent1.toString());
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81 }
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82 if (parent2 != null && parent2.length < 20) {
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83 throw new IllegalArgumentException(parent2.toString());
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84 }
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85 class ParentCollector implements Revlog.Inspector {
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86 public int p1 = -1;
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87 public int p2 = -1;
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88 public byte[] nodeid;
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89
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90 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, byte[] data) {
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91 p1 = parent1Revision;
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92 p2 = parent2Revision;
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93 this.nodeid = new byte[20];
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94 // nodeid arg now comes in 32 byte from (as in file format description), however upper 12 bytes are zeros.
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95 System.arraycopy(nodeid, nodeid.length > 20 ? nodeid.length - 20 : 0, this.nodeid, 0, 20);
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96 }
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97 };
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98 ParentCollector pc = new ParentCollector();
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99 content.iterate(revision, revision, false, pc);
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100 parentRevisions[0] = pc.p1;
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101 parentRevisions[1] = pc.p2;
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102 if (parent1 != null) {
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103 if (parentRevisions[0] == -1) {
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104 Arrays.fill(parent1, 0, 20, (byte) 0);
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105 } else {
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106 content.iterate(parentRevisions[0], parentRevisions[0], false, pc);
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107 System.arraycopy(pc.nodeid, 0, parent1, 0, 20);
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108 }
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109 }
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110 if (parent2 != null) {
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111 if (parentRevisions[1] == -1) {
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112 Arrays.fill(parent2, 0, 20, (byte) 0);
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113 } else {
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114 content.iterate(parentRevisions[1], parentRevisions[1], false, pc);
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115 System.arraycopy(pc.nodeid, 0, parent2, 0, 20);
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116 }
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117 }
571e1b2cc3f7 Query file for its parents. Demo of recently added ignore and digest support from within cat cmd
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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