Mercurial > jhg
annotate src/org/tmatesoft/hg/repo/HgManifest.java @ 236:883300108179
Speed up branches calculation when cached branch information is available
| author | Artem Tikhomirov <tikhomirov.artem@gmail.com> | 
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| date | Thu, 09 Jun 2011 06:13:43 +0200 | 
| parents | b7347daa50e3 | 
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changeset | 1 /* | 
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changeset | 2 * Copyright (c) 2010-2011 TMate Software Ltd | 
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changeset | 3 * | 
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changeset | 4 * This program is free software; you can redistribute it and/or modify | 
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changeset | 5 * it under the terms of the GNU General Public License as published by | 
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changeset | 6 * the Free Software Foundation; version 2 of the License. | 
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changeset | 7 * | 
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changeset | 8 * This program is distributed in the hope that it will be useful, | 
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changeset | 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of | 
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changeset | 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | 
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changeset | 11 * GNU General Public License for more details. | 
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changeset | 12 * | 
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changeset | 13 * For information on how to redistribute this software under | 
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changeset | 14 * the terms of a license other than GNU General Public License | 
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changeset | 15 * contact TMate Software at support@hg4j.com | 
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changeset | 16 */ | 
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changeset | 17 package org.tmatesoft.hg.repo; | 
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changeset | 18 | 
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changeset | 19 import static org.tmatesoft.hg.repo.HgRepository.TIP; | 
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changeset | 20 | 
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changeset | 21 import java.io.ByteArrayOutputStream; | 
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changeset | 22 import java.io.IOException; | 
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changeset | 23 import java.util.ArrayList; | 
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changeset | 24 import java.util.Arrays; | 
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changeset | 25 | 
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changeset | 26 import org.tmatesoft.hg.core.HgBadStateException; | 
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changeset | 27 import org.tmatesoft.hg.core.Nodeid; | 
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changeset | 28 import org.tmatesoft.hg.internal.DataAccess; | 
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changeset | 29 import org.tmatesoft.hg.internal.Experimental; | 
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changeset | 30 import org.tmatesoft.hg.internal.Lifecycle; | 
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changeset | 31 import org.tmatesoft.hg.internal.Pool; | 
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changeset | 32 import org.tmatesoft.hg.internal.RevlogStream; | 
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changeset | 33 import org.tmatesoft.hg.util.Path; | 
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changeset | 34 | 
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changeset | 35 | 
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changeset | 36 /** | 
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changeset | 37 * | 
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changeset | 38 * @author Artem Tikhomirov | 
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changeset | 39 * @author TMate Software Ltd. | 
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changeset | 40 */ | 
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changeset | 41 public class HgManifest extends Revlog { | 
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changeset | 42 private RevisionMapper revisionMap; | 
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changeset | 43 | 
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changeset | 44 /*package-local*/ HgManifest(HgRepository hgRepo, RevlogStream content) { | 
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changeset | 45 super(hgRepo, content); | 
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changeset | 46 } | 
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changeset | 47 | 
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changeset | 48 /** | 
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changeset | 49 * | 
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changeset | 50 * @param start changelog (not manifest!) revision to begin with | 
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changeset | 51 * @param end changelog (not manifest!) revision to stop, inclusive. | 
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changeset | 52 * @param inspector can't be <code>null</code> | 
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changeset | 53 */ | 
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changeset | 54 public void walk(int start, int end, final Inspector inspector) { | 
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changeset | 55 if (inspector == null) { | 
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changeset | 56 throw new IllegalArgumentException(); | 
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changeset | 57 } | 
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changeset | 58 int start0 = fromChangelog(start); | 
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changeset | 59 int end0 = fromChangelog(end); | 
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changeset | 60 content.iterate(start0, end0, true, new ManifestParser(inspector)); | 
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changeset | 61 } | 
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changeset | 62 | 
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changeset | 63 // manifest revision number that corresponds to the given changeset | 
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changeset | 64 /*package-local*/ int fromChangelog(int revisionNumber) { | 
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changeset | 65 if (HgInternals.wrongLocalRevision(revisionNumber)) { | 
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changeset | 66 throw new IllegalArgumentException(String.valueOf(revisionNumber)); | 
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changeset | 67 } | 
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changeset | 68 if (revisionMap == null) { | 
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changeset | 69 revisionMap = new RevisionMapper(getRepo()); | 
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changeset | 70 content.iterate(0, TIP, false, revisionMap); | 
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changeset | 71 } | 
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changeset | 72 return revisionMap.at(revisionNumber); | 
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changeset | 73 } | 
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changeset | 74 | 
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changeset | 75 /** | 
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changeset | 76 * Extracts file revision as it was known at the time of given changeset. | 
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changeset | 77 * | 
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changeset | 78 * @param revisionNumber local changeset index | 
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changeset | 79 * @param file path to file in question | 
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changeset | 80 * @return file revision or <code>null</code> if manifest at specified revision doesn't list such file | 
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changeset | 81 */ | 
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changeset | 82 @Experimental(reason="Perhaps, HgDataFile shall own this method") | 
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changeset | 83 public Nodeid getFileRevision(int revisionNumber, final Path file) { | 
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changeset | 84 int rev = fromChangelog(revisionNumber); | 
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changeset | 85 final Nodeid[] rv = new Nodeid[] { null }; | 
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changeset | 86 content.iterate(rev, rev, true, new RevlogStream.Inspector() { | 
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changeset | 87 | 
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changeset | 88 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) { | 
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changeset | 89 ByteArrayOutputStream bos = new ByteArrayOutputStream(); | 
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changeset | 90 try { | 
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changeset | 91 byte b; | 
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changeset | 92 while (!data.isEmpty() && (b = data.readByte()) != '\n') { | 
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changeset | 93 if (b != 0) { | 
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changeset | 94 bos.write(b); | 
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changeset | 95 } else { | 
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changeset | 96 String fname = new String(bos.toByteArray()); | 
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changeset | 97 bos.reset(); | 
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changeset | 98 if (file.toString().equals(fname)) { | 
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changeset | 99 byte[] nid = new byte[40]; | 
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changeset | 100 data.readBytes(nid, 0, 40); | 
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changeset | 101 rv[0] = Nodeid.fromAscii(nid, 0, 40); | 
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changeset | 102 break; | 
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changeset | 103 } | 
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changeset | 104 // else skip to the end of line | 
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changeset | 105 while (!data.isEmpty() && (b = data.readByte()) != '\n') | 
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changeset | 106 ; | 
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changeset | 107 } | 
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changeset | 108 } | 
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changeset | 109 } catch (IOException ex) { | 
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changeset | 110 throw new HgBadStateException(ex); | 
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changeset | 111 } | 
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changeset | 112 } | 
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changeset | 113 }); | 
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changeset | 114 return rv[0]; | 
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changeset | 115 } | 
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changeset | 116 | 
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changeset | 117 public interface Inspector { | 
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changeset | 118 boolean begin(int mainfestRevision, Nodeid nid, int changelogRevision); | 
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changeset | 119 boolean next(Nodeid nid, String fname, String flags); | 
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changeset | 120 boolean end(int manifestRevision); | 
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changeset | 121 } | 
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changeset | 122 | 
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changeset | 123 private static class ManifestParser implements RevlogStream.Inspector { | 
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changeset | 124 private boolean gtg = true; // good to go | 
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changeset | 125 private final Inspector inspector; | 
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changeset | 126 private final Pool<Nodeid> nodeidPool; | 
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changeset | 127 private final Pool<String> fnamePool; | 
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changeset | 128 private final Pool<String> flagsPool; | 
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changeset | 129 | 
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changeset | 130 public ManifestParser(Inspector delegate) { | 
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changeset | 131 assert delegate != null; | 
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changeset | 132 inspector = delegate; | 
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changeset | 133 nodeidPool = new Pool<Nodeid>(); | 
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changeset | 134 fnamePool = new Pool<String>(); | 
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changeset | 135 flagsPool = new Pool<String>(); | 
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changeset | 136 } | 
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changeset | 137 | 
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changeset | 138 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess da) { | 
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changeset | 139 if (!gtg) { | 
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changeset | 140 return; | 
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changeset | 141 } | 
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changeset | 142 try { | 
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changeset | 143 gtg = gtg && inspector.begin(revisionNumber, new Nodeid(nodeid, true), linkRevision); | 
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changeset | 144 int i; | 
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changeset | 145 String fname = null; | 
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changeset | 146 String flags = null; | 
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changeset | 147 Nodeid nid = null; | 
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changeset | 148 byte[] data = da.byteArray(); | 
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changeset | 149 for (i = 0; gtg && i < actualLen; i++) { | 
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changeset | 150 int x = i; | 
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changeset | 151 for( ; data[i] != '\n' && i < actualLen; i++) { | 
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changeset | 152 if (fname == null && data[i] == 0) { | 
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changeset | 153 fname = fnamePool.unify(new String(data, x, i - x)); | 
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changeset | 154 x = i+1; | 
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changeset | 155 } | 
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changeset | 156 } | 
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changeset | 157 if (i < actualLen) { | 
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changeset | 158 assert data[i] == '\n'; | 
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changeset | 159 int nodeidLen = i - x < 40 ? i-x : 40; | 
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changeset | 160 nid = nodeidPool.unify(Nodeid.fromAscii(data, x, nodeidLen)); | 
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changeset | 161 if (nodeidLen + x < i) { | 
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changeset | 162 // 'x' and 'l' for executable bits and symlinks? | 
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changeset | 163 // hg --debug manifest shows 644 for each regular file in my repo | 
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changeset | 164 flags = flagsPool.unify(new String(data, x + nodeidLen, i-x-nodeidLen)); | 
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changeset | 165 } | 
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changeset | 166 gtg = gtg && inspector.next(nid, fname, flags); | 
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changeset | 167 } | 
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changeset | 168 nid = null; | 
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changeset | 169 fname = flags = null; | 
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changeset | 170 } | 
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changeset | 171 gtg = gtg && inspector.end(revisionNumber); | 
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changeset | 172 } catch (IOException ex) { | 
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changeset | 173 throw new HgBadStateException(ex); | 
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changeset | 174 } | 
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changeset | 175 } | 
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changeset | 176 } | 
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changeset | 177 | 
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changeset | 178 private static class RevisionMapper implements RevlogStream.Inspector, Lifecycle { | 
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changeset | 179 | 
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changeset | 180 private final int changelogRevisions; | 
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changeset | 181 private int[] changelog2manifest; | 
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changeset | 182 private final HgRepository repo; | 
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changeset | 183 | 
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changeset | 184 public RevisionMapper(HgRepository hgRepo) { | 
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changeset | 185 repo = hgRepo; | 
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changeset | 186 changelogRevisions = repo.getChangelog().getRevisionCount(); | 
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changeset | 187 } | 
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changeset | 188 | 
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changeset | 189 public int at(int revisionNumber) { | 
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changeset | 190 if (changelog2manifest != null) { | 
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changeset | 191 return changelog2manifest[revisionNumber]; | 
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changeset | 192 } | 
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changeset | 193 return revisionNumber; | 
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changeset | 194 } | 
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changeset | 195 | 
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changeset | 196 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) { | 
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changeset | 197 if (changelog2manifest != null) { | 
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changeset | 198 // next assertion is not an error, rather assumption check, which is too development-related to be explicit exception - | 
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changeset | 199 // I just wonder if there are manifests that have two entries pointing to single changeset. It seems unrealistic, though - | 
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changeset | 200 // changeset records one and only one manifest nodeid | 
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changeset | 201 assert changelog2manifest[linkRevision] == -1 : String.format("revision:%d, link:%d, already linked to revision:%d", revisionNumber, linkRevision, changelog2manifest[linkRevision]); | 
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changeset | 202 changelog2manifest[linkRevision] = revisionNumber; | 
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changeset | 203 } else { | 
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changeset | 204 if (revisionNumber != linkRevision) { | 
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changeset | 205 changelog2manifest = new int[changelogRevisions]; | 
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changeset | 206 Arrays.fill(changelog2manifest, -1); | 
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changeset | 207 for (int i = 0; i < revisionNumber; changelog2manifest[i] = i, i++) | 
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changeset | 208 ; | 
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changeset | 209 changelog2manifest[linkRevision] = revisionNumber; | 
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changeset | 210 } | 
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changeset | 211 } | 
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changeset | 212 } | 
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changeset | 213 | 
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changeset | 214 public void start(int count, Callback callback, Object token) { | 
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changeset | 215 if (count != changelogRevisions) { | 
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changeset | 216 assert count < changelogRevisions; // no idea what to do if manifest has more revisions than changelog | 
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changeset | 217 // the way how manifest may contain more revisions than changelog, as I can imagine, is a result of | 
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changeset | 218 // some kind of an import tool (e.g. from SVN or CVS), that creates manifest and changelog independently. | 
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changeset | 219 // Note, it's pure guess, I didn't see such repository yet (although the way manifest revisions | 
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changeset | 220 // in cpython repo are numbered makes me think aforementioned way) | 
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changeset | 221 changelog2manifest = new int[changelogRevisions]; | 
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changeset | 222 Arrays.fill(changelog2manifest, -1); | 
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changeset | 223 } | 
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changeset | 224 } | 
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changeset | 225 | 
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changeset | 226 public void finish(Object token) { | 
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changeset | 227 if (changelog2manifest == null) { | 
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changeset | 228 return; | 
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changeset | 229 } | 
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changeset | 230 // I assume there'd be not too many revisions we don't know manifest of | 
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changeset | 231 ArrayList<Integer> undefinedChangelogRevision = new ArrayList<Integer>(); | 
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changeset | 232 for (int i = 0; i < changelog2manifest.length; i++) { | 
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changeset | 233 if (changelog2manifest[i] == -1) { | 
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changeset | 234 undefinedChangelogRevision.add(i); | 
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changeset | 235 } | 
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changeset | 236 } | 
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changeset | 237 for (int u : undefinedChangelogRevision) { | 
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changeset | 238 Nodeid manifest = repo.getChangelog().range(u, u).get(0).manifest(); | 
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Basic information about branches
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changeset | 239 // FIXME calculate those missing effectively (e.g. cache and sort nodeids to speed lookup | 
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changeset | 240 // right away in the #next (may refactor ParentWalker's sequential and sorted into dedicated helper and reuse here) | 
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changeset | 241 changelog2manifest[u] = repo.getManifest().getLocalRevision(manifest); | 
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changeset | 242 } | 
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changeset | 243 } | 
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changeset | 244 } | 
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changeset | 245 } | 
