Mercurial > jhg
annotate src/org/tmatesoft/hg/repo/HgDataFile.java @ 92:bf304cb14247
Just in case mediator does anything to visitor on done()
| author | Artem Tikhomirov <tikhomirov.artem@gmail.com> | 
|---|---|
| date | Thu, 27 Jan 2011 06:31:58 +0100 | 
| parents | 61eedab3eb3e | 
| children | a3a2e5deb320 | 
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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@svnkit.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.util.ArrayList; | 
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changeset | 22 import java.util.Collection; | 
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changeset | 23 import java.util.TreeMap; | 
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changeset | 24 | 
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changeset | 25 import org.tmatesoft.hg.core.Nodeid; | 
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changeset | 26 import org.tmatesoft.hg.core.Path; | 
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changeset | 27 import org.tmatesoft.hg.internal.RevlogStream; | 
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changeset | 28 | 
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changeset | 29 | 
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changeset | 30 | 
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changeset | 31 /** | 
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changeset | 32 * ? name:HgFileNode? | 
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changeset | 33 * | 
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changeset | 34 * @author Artem Tikhomirov | 
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changeset | 35 * @author TMate Software Ltd. | 
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changeset | 36 */ | 
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changeset | 37 public class HgDataFile extends Revlog { | 
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changeset | 38 | 
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changeset | 39 // absolute from repo root? | 
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changeset | 40 // slashes, unix-style? | 
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changeset | 41 // repo location agnostic, just to give info to user, not to access real storage | 
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changeset | 42 private final Path path; | 
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changeset | 43 private Metadata metadata; | 
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changeset | 44 | 
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changeset | 45 /*package-local*/HgDataFile(HgRepository hgRepo, Path path, RevlogStream content) { | 
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changeset | 46 super(hgRepo, content); | 
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changeset | 47 this.path = path; | 
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changeset | 48 } | 
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changeset | 49 | 
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changeset | 50 public boolean exists() { | 
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changeset | 51 return content != null; // XXX need better impl | 
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changeset | 52 } | 
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changeset | 53 | 
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changeset | 54 // human-readable (i.e. "COPYING", not "store/data/_c_o_p_y_i_n_g.i") | 
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changeset | 55 public Path getPath() { | 
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changeset | 56 return path; // hgRepo.backresolve(this) -> name? | 
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changeset | 57 } | 
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changeset | 58 | 
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changeset | 59 public int length(Nodeid nodeid) { | 
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changeset | 60 return content.dataLength(getLocalRevision(nodeid)); | 
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changeset | 61 } | 
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changeset | 62 | 
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changeset | 63 public byte[] content() { | 
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changeset | 64 return content(TIP); | 
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changeset | 65 } | 
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changeset | 66 | 
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changeset | 67 // for data files need to check heading of the file content for possible metadata | 
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changeset | 68 // @see http://mercurial.selenic.com/wiki/FileFormats#data.2BAC8- | 
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changeset | 69 @Override | 
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changeset | 70 public byte[] content(int revision) { | 
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changeset | 71 if (revision == TIP) { | 
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changeset | 72 revision = content.revisionCount() - 1; // FIXME maxRevision. | 
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changeset | 73 } | 
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changeset | 74 byte[] data = super.content(revision); | 
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changeset | 75 if (data.length < 4 || (data[0] != 1 && data[1] != 10)) { | 
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changeset | 76 return data; | 
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changeset | 77 } | 
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changeset | 78 int toSkip = 0; | 
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changeset | 79 if (metadata == null || !metadata.known(revision)) { | 
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changeset | 80 int lastEntryStart = 2; | 
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changeset | 81 int lastColon = -1; | 
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changeset | 82 ArrayList<MetadataEntry> _metadata = new ArrayList<MetadataEntry>(); | 
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changeset | 83 String key = null, value = null; | 
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changeset | 84 for (int i = 2; i < data.length; i++) { | 
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changeset | 85 if (data[i] == (int) ':') { | 
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changeset | 86 key = new String(data, lastEntryStart, i - lastEntryStart); | 
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changeset | 87 lastColon = i; | 
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changeset | 88 } else if (data[i] == '\n') { | 
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changeset | 89 if (key == null || lastColon == -1 || i <= lastColon) { | 
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changeset | 90 throw new IllegalStateException(); // FIXME log instead and record null key in the metadata. Ex just to fail fast during dev | 
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changeset | 91 } | 
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changeset | 92 value = new String(data, lastColon + 1, i - lastColon - 1).trim(); | 
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changeset | 93 _metadata.add(new MetadataEntry(key, value)); | 
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changeset | 94 key = value = null; | 
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changeset | 95 lastColon = -1; | 
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changeset | 96 lastEntryStart = i+1; | 
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changeset | 97 } else if (data[i] == 1 && i + 1 < data.length && data[i+1] == 10) { | 
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changeset | 98 if (key != null && lastColon != -1 && i > lastColon) { | 
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changeset | 99 // just in case last entry didn't end with newline | 
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changeset | 100 value = new String(data, lastColon + 1, i - lastColon - 1); | 
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changeset | 101 _metadata.add(new MetadataEntry(key, value)); | 
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changeset | 102 } | 
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changeset | 103 lastEntryStart = i+1; | 
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changeset | 104 break; | 
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changeset | 105 } | 
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changeset | 106 } | 
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changeset | 107 _metadata.trimToSize(); | 
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changeset | 108 if (metadata == null) { | 
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changeset | 109 metadata = new Metadata(); | 
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changeset | 110 } | 
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changeset | 111 metadata.add(revision, lastEntryStart, _metadata); | 
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changeset | 112 toSkip = lastEntryStart; | 
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changeset | 113 } else { | 
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changeset | 114 toSkip = metadata.dataOffset(revision); | 
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changeset | 115 } | 
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changeset | 116 // XXX copy of an array may be memory-hostile, a wrapper with baseOffsetShift(lastEntryStart) would be more convenient | 
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changeset | 117 byte[] rv = new byte[data.length - toSkip]; | 
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changeset | 118 System.arraycopy(data, toSkip, rv, 0, rv.length); | 
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changeset | 119 return rv; | 
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changeset | 120 } | 
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changeset | 121 | 
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changeset | 122 public void history(Changeset.Inspector inspector) { | 
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changeset | 123 history(0, content.revisionCount() - 1, inspector); | 
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changeset | 124 } | 
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changeset | 125 | 
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changeset | 126 public void history(int start, int end, Changeset.Inspector inspector) { | 
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changeset | 127 if (!exists()) { | 
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changeset | 128 throw new IllegalStateException("Can't get history of invalid repository file node"); | 
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changeset | 129 } | 
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changeset | 130 final int last = content.revisionCount() - 1; | 
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changeset | 131 if (start < 0 || start > last) { | 
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changeset | 132 throw new IllegalArgumentException(); | 
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changeset | 133 } | 
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changeset | 134 if (end == TIP) { | 
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changeset | 135 end = last; | 
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changeset | 136 } else if (end < start || end > last) { | 
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changeset | 137 throw new IllegalArgumentException(); | 
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changeset | 138 } | 
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changeset | 139 final int[] commitRevisions = new int[end - start + 1]; | 
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changeset | 140 RevlogStream.Inspector insp = new RevlogStream.Inspector() { | 
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changeset | 141 int count = 0; | 
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changeset | 142 | 
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changeset | 143 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, byte[] data) { | 
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changeset | 144 commitRevisions[count++] = linkRevision; | 
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changeset | 145 } | 
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changeset | 146 }; | 
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changeset | 147 content.iterate(start, end, false, insp); | 
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changeset | 148 getRepo().getChangelog().range(inspector, commitRevisions); | 
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changeset | 149 } | 
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changeset | 150 | 
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changeset | 151 // for a given local revision of the file, find out local revision in the changelog | 
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changeset | 152 public int getChangesetLocalRevision(int revision) { | 
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changeset | 153 return content.linkRevision(revision); | 
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changeset | 154 } | 
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changeset | 155 | 
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changeset | 156 public Nodeid getChangesetRevision(Nodeid nid) { | 
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changeset | 157 int changelogRevision = getChangesetLocalRevision(getLocalRevision(nid)); | 
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changeset | 158 return getRepo().getChangelog().getRevision(changelogRevision); | 
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changeset | 159 } | 
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changeset | 160 | 
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changeset | 161 public boolean isCopy() { | 
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changeset | 162 if (metadata == null) { | 
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changeset | 163 content(0); // FIXME expensive way to find out metadata, distinct RevlogStream.Iterator would be better. | 
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changeset | 164 } | 
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changeset | 165 if (metadata == null || !metadata.known(0)) { | 
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changeset | 166 return false; | 
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changeset | 167 } | 
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changeset | 168 return metadata.find(0, "copy") != null; | 
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changeset | 169 } | 
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changeset | 170 | 
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changeset | 171 public Path getCopySourceName() { | 
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changeset | 172 if (isCopy()) { | 
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changeset | 173 return Path.create(metadata.find(0, "copy")); | 
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changeset | 174 } | 
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changeset | 175 throw new UnsupportedOperationException(); // XXX REVISIT, think over if Exception is good (clients would check isCopy() anyway, perhaps null is sufficient?) | 
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changeset | 176 } | 
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changeset | 177 | 
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changeset | 178 public Nodeid getCopySourceRevision() { | 
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changeset | 179 if (isCopy()) { | 
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changeset | 180 return Nodeid.fromAscii(metadata.find(0, "copyrev")); // XXX reuse/cache Nodeid | 
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changeset | 181 } | 
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changeset | 182 throw new UnsupportedOperationException(); | 
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changeset | 183 } | 
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changeset | 184 | 
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changeset | 185 @Override | 
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changeset | 186 public String toString() { | 
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changeset | 187 StringBuilder sb = new StringBuilder(getClass().getSimpleName()); | 
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changeset | 188 sb.append('('); | 
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changeset | 189 sb.append(getPath()); | 
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changeset | 190 sb.append(')'); | 
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changeset | 191 return sb.toString(); | 
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changeset | 192 } | 
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changeset | 193 | 
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changeset | 194 private static final class MetadataEntry { | 
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changeset | 195 private final String entry; | 
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changeset | 196 private final int valueStart; | 
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changeset | 197 /*package-local*/MetadataEntry(String key, String value) { | 
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changeset | 198 entry = key + value; | 
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changeset | 199 valueStart = key.length(); | 
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changeset | 200 } | 
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changeset | 201 /*package-local*/boolean matchKey(String key) { | 
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changeset | 202 return key.length() == valueStart && entry.startsWith(key); | 
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changeset | 203 } | 
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changeset | 204 public String key() { | 
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changeset | 205 return entry.substring(0, valueStart); | 
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changeset | 206 } | 
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changeset | 207 public String value() { | 
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changeset | 208 return entry.substring(valueStart); | 
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changeset | 209 } | 
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changeset | 210 } | 
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changeset | 211 | 
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changeset | 212 private static class Metadata { | 
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changeset | 213 // XXX sparse array needed | 
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changeset | 214 private final TreeMap<Integer, Integer> offsets = new TreeMap<Integer, Integer>(); | 
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changeset | 215 private final TreeMap<Integer, MetadataEntry[]> entries = new TreeMap<Integer, MetadataEntry[]>(); | 
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changeset | 216 boolean known(int revision) { | 
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changeset | 217 return offsets.containsKey(revision); | 
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changeset | 218 } | 
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changeset | 219 // since this is internal class, callers are supposed to ensure arg correctness (i.e. ask known() before) | 
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changeset | 220 int dataOffset(int revision) { | 
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changeset | 221 return offsets.get(revision); | 
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changeset | 222 } | 
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changeset | 223 void add(int revision, int dataOffset, Collection<MetadataEntry> e) { | 
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changeset | 224 offsets.put(revision, dataOffset); | 
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changeset | 225 entries.put(revision, e.toArray(new MetadataEntry[e.size()])); | 
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changeset | 226 } | 
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changeset | 227 String find(int revision, String key) { | 
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changeset | 228 for (MetadataEntry me : entries.get(revision)) { | 
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changeset | 229 if (me.matchKey(key)) { | 
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changeset | 230 return me.value(); | 
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changeset | 231 } | 
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changeset | 232 } | 
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changeset | 233 return null; | 
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changeset | 234 } | 
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changeset | 235 } | 
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changeset | 236 } | 
