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annotate src/org/tmatesoft/hg/repo/HgDataFile.java @ 158:b413b16d10a5

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Integer offsets and file length explictly, rather than casts throughout code. Inflater may benefit from total length hint, but shall calculate it by its own if needed
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 09 Mar 2011 13:16:37 +0100
parents d5268ca7715b
children a5198b6487dc
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1 /*
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2 * Copyright (c) 2010-2011 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.repo;
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19 import static org.tmatesoft.hg.repo.HgInternals.wrongLocalRevision;
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20 import static org.tmatesoft.hg.repo.HgRepository.*;
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22 import java.io.ByteArrayOutputStream;
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23 import java.io.IOException;
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24 import java.nio.ByteBuffer;
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25 import java.util.ArrayList;
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26 import java.util.Collection;
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27 import java.util.TreeMap;
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29 import org.tmatesoft.hg.core.HgDataStreamException;
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30 import org.tmatesoft.hg.core.HgException;
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31 import org.tmatesoft.hg.core.Nodeid;
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32 import org.tmatesoft.hg.internal.DataAccess;
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33 import org.tmatesoft.hg.internal.FilterByteChannel;
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34 import org.tmatesoft.hg.internal.RevlogStream;
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35 import org.tmatesoft.hg.util.ByteChannel;
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36 import org.tmatesoft.hg.util.CancelledException;
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37 import org.tmatesoft.hg.util.Path;
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41 /**
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42 * ? name:HgFileNode?
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43 *
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44 * @author Artem Tikhomirov
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45 * @author TMate Software Ltd.
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46 */
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47 public class HgDataFile extends Revlog {
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48
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49 // absolute from repo root?
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50 // slashes, unix-style?
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51 // repo location agnostic, just to give info to user, not to access real storage
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52 private final Path path;
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53 private Metadata metadata; // get initialized on first access to file content.
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55 /*package-local*/HgDataFile(HgRepository hgRepo, Path filePath, RevlogStream content) {
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56 super(hgRepo, content);
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57 path = filePath;
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58 }
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60 /*package-local*/HgDataFile(HgRepository hgRepo, Path filePath) {
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61 super(hgRepo);
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62 path = filePath;
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63 }
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65 // exists is not the best name possible. now it means no file with such name was ever known to the repo.
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66 // it might be confused with files existed before but lately removed.
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67 public boolean exists() {
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68 return content != null; // XXX need better impl
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69 }
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71 // human-readable (i.e. "COPYING", not "store/data/_c_o_p_y_i_n_g.i")
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72 public Path getPath() {
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73 return path; // hgRepo.backresolve(this) -> name? In this case, what about hashed long names?
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74 }
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76 public int length(Nodeid nodeid) {
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77 return content.dataLength(getLocalRevision(nodeid));
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78 }
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80 public void workingCopy(ByteChannel sink) throws IOException, CancelledException {
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81 throw HgRepository.notImplemented();
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82 }
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84 // public void content(int revision, ByteChannel sink, boolean applyFilters) throws HgDataStreamException, IOException, CancelledException {
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85 // byte[] content = content(revision);
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86 // final CancelSupport cancelSupport = CancelSupport.Factory.get(sink);
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87 // final ProgressSupport progressSupport = ProgressSupport.Factory.get(sink);
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88 // ByteBuffer buf = ByteBuffer.allocate(512);
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89 // int left = content.length;
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90 // progressSupport.start(left);
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91 // int offset = 0;
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92 // cancelSupport.checkCancelled();
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93 // ByteChannel _sink = applyFilters ? new FilterByteChannel(sink, getRepo().getFiltersFromRepoToWorkingDir(getPath())) : sink;
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94 // do {
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95 // buf.put(content, offset, Math.min(left, buf.remaining()));
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96 // buf.flip();
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97 // cancelSupport.checkCancelled();
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98 // // XXX I may not rely on returned number of bytes but track change in buf position instead.
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99 // int consumed = _sink.write(buf);
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100 // buf.compact();
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101 // offset += consumed;
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102 // left -= consumed;
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103 // progressSupport.worked(consumed);
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104 // } while (left > 0);
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105 // progressSupport.done(); // XXX shall specify whether #done() is invoked always or only if completed successfully.
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106 // }
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108 /*XXX not sure distinct method contentWithFilters() is the best way to do, perhaps, callers shall add filters themselves?*/
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109 public void contentWithFilters(int revision, ByteChannel sink) throws HgDataStreamException, IOException, CancelledException {
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110 content(revision, new FilterByteChannel(sink, getRepo().getFiltersFromRepoToWorkingDir(getPath())));
115
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111 }
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112
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113 // for data files need to check heading of the file content for possible metadata
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114 // @see http://mercurial.selenic.com/wiki/FileFormats#data.2BAC8-
157
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115 public void content(int revision, ByteChannel sink) throws HgDataStreamException, IOException, CancelledException {
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116 if (revision == TIP) {
135
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117 revision = getLastRevision();
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118 }
157
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119 if (revision == WORKING_COPY) {
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120 workingCopy(sink);
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121 return;
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122 }
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123 if (wrongLocalRevision(revision) || revision == BAD_REVISION) {
148
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124 throw new IllegalArgumentException(String.valueOf(revision));
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125 }
157
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126 if (sink == null) {
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127 throw new IllegalArgumentException();
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128 }
134
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129 if (metadata == null) {
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130 metadata = new Metadata();
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131 }
157
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132 ContentPipe insp;
134
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133 if (metadata.none(revision)) {
157
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134 insp = new ContentPipe(sink, 0);
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135 } else if (metadata.known(revision)) {
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136 insp = new ContentPipe(sink, metadata.dataOffset(revision));
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137 } else {
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138 // do not know if there's metadata
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139 insp = new MetadataContentPipe(sink, metadata);
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140 }
157
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141 insp.checkCancelled();
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142 super.content.iterate(revision, revision, true, insp);
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143 try {
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144 insp.checkFailed();
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145 } catch (HgDataStreamException ex) {
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146 throw ex;
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147 } catch (HgException ex) {
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148 // shall not happen, unless we changed ContentPipe or its subclass
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149 throw new HgDataStreamException(ex.getClass().getName(), ex);
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150 }
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151 }
157
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152
129
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153 public void history(HgChangelog.Inspector inspector) {
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154 history(0, getLastRevision(), inspector);
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155 }
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156
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157 public void history(int start, int end, HgChangelog.Inspector inspector) {
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158 if (!exists()) {
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159 throw new IllegalStateException("Can't get history of invalid repository file node");
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160 }
135
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161 final int last = getLastRevision();
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162 if (start < 0 || start > last) {
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163 throw new IllegalArgumentException();
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164 }
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165 if (end == TIP) {
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166 end = last;
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167 } else if (end < start || end > last) {
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168 throw new IllegalArgumentException();
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169 }
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170 final int[] commitRevisions = new int[end - start + 1];
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171 RevlogStream.Inspector insp = new RevlogStream.Inspector() {
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172 int count = 0;
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173
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174 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) {
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175 commitRevisions[count++] = linkRevision;
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176 }
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177 };
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178 content.iterate(start, end, false, insp);
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179 getRepo().getChangelog().range(inspector, commitRevisions);
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180 }
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181
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182 // for a given local revision of the file, find out local revision in the changelog
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183 public int getChangesetLocalRevision(int revision) {
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184 return content.linkRevision(revision);
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185 }
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186
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187 public Nodeid getChangesetRevision(Nodeid nid) {
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188 int changelogRevision = getChangesetLocalRevision(getLocalRevision(nid));
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189 return getRepo().getChangelog().getRevision(changelogRevision);
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190 }
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191
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192 public boolean isCopy() throws HgDataStreamException {
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193 if (metadata == null || !metadata.checked(0)) {
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194 // content() always initializes metadata.
157
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195 // FIXME this is expensive way to find out metadata, distinct RevlogStream.Iterator would be better.
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196 try {
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197 content(0, new ByteChannel() { // No-op channel
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198 public int write(ByteBuffer buffer) throws IOException {
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199 // pretend we consumed whole buffer
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200 int rv = buffer.remaining();
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201 buffer.position(buffer.limit());
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202 return rv;
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203 }
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204 });
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205 } catch (Exception ex) {
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206 throw new HgDataStreamException("Can't initialize metadata", ex);
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207 }
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208 }
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209 if (!metadata.known(0)) {
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210 return false;
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211 }
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212 return metadata.find(0, "copy") != null;
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213 }
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214
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diff changeset
215 public Path getCopySourceName() throws HgDataStreamException {
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216 if (isCopy()) {
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217 return Path.create(metadata.find(0, "copy"));
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218 }
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219 throw new UnsupportedOperationException(); // XXX REVISIT, think over if Exception is good (clients would check isCopy() anyway, perhaps null is sufficient?)
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220 }
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221
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222 public Nodeid getCopySourceRevision() throws HgDataStreamException {
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223 if (isCopy()) {
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224 return Nodeid.fromAscii(metadata.find(0, "copyrev")); // XXX reuse/cache Nodeid
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225 }
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226 throw new UnsupportedOperationException();
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227 }
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228
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229 @Override
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230 public String toString() {
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231 StringBuilder sb = new StringBuilder(getClass().getSimpleName());
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232 sb.append('(');
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233 sb.append(getPath());
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234 sb.append(')');
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235 return sb.toString();
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236 }
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237
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238 private static final class MetadataEntry {
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239 private final String entry;
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240 private final int valueStart;
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241 /*package-local*/MetadataEntry(String key, String value) {
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242 entry = key + value;
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243 valueStart = key.length();
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244 }
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245 /*package-local*/boolean matchKey(String key) {
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246 return key.length() == valueStart && entry.startsWith(key);
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247 }
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248 // uncomment once/if needed
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249 // public String key() {
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250 // return entry.substring(0, valueStart);
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251 // }
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252 public String value() {
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253 return entry.substring(valueStart);
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254 }
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255 }
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256
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257 private static class Metadata {
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258 // XXX sparse array needed
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259 private final TreeMap<Integer, Integer> offsets = new TreeMap<Integer, Integer>();
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260 private final TreeMap<Integer, MetadataEntry[]> entries = new TreeMap<Integer, MetadataEntry[]>();
134
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261
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262 private final Integer NONE = new Integer(-1); // do not duplicate -1 integers at least within single file (don't want statics)
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263
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264 // true when there's metadata for given revision
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265 boolean known(int revision) {
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266 Integer i = offsets.get(revision);
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267 return i != null && NONE != i;
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268 }
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269
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270 // true when revision has been checked for metadata presence.
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271 public boolean checked(int revision) {
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272 return offsets.containsKey(revision);
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273 }
134
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274
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275 // true when revision has been checked and found not having any metadata
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276 boolean none(int revision) {
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277 Integer i = offsets.get(revision);
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278 return i == NONE;
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279 }
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280
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281 // mark revision as having no metadata.
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282 void recordNone(int revision) {
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283 Integer i = offsets.get(revision);
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284 if (i == NONE) {
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285 return; // already there
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286 }
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287 if (i != null) {
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288 throw new IllegalStateException(String.format("Trying to override Metadata state for revision %d (known offset: %d)", revision, i));
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289 }
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290 offsets.put(revision, NONE);
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291 }
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292
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293 // since this is internal class, callers are supposed to ensure arg correctness (i.e. ask known() before)
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294 int dataOffset(int revision) {
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295 return offsets.get(revision);
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296 }
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297 void add(int revision, int dataOffset, Collection<MetadataEntry> e) {
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298 assert !offsets.containsKey(revision);
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299 offsets.put(revision, dataOffset);
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300 entries.put(revision, e.toArray(new MetadataEntry[e.size()]));
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301 }
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302 String find(int revision, String key) {
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303 for (MetadataEntry me : entries.get(revision)) {
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304 if (me.matchKey(key)) {
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305 return me.value();
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306 }
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307 }
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308 return null;
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309 }
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310 }
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311
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312 private static class MetadataContentPipe extends ContentPipe {
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313
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314 private final Metadata metadata;
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315
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316 public MetadataContentPipe(ByteChannel sink, Metadata _metadata) {
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317 super(sink, 0);
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318 metadata = _metadata;
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319 }
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320
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321 @Override
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322 protected void prepare(int revisionNumber, DataAccess da) throws HgException, IOException {
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323 final int daLength = da.length();
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324 if (daLength < 4 || da.readByte() != 1 || da.readByte() != 10) {
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325 metadata.recordNone(revisionNumber);
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326 da.reset();
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327 return;
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328 }
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329 int lastEntryStart = 2;
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330 int lastColon = -1;
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331 ArrayList<MetadataEntry> _metadata = new ArrayList<MetadataEntry>();
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332 // XXX in fact, need smth like ByteArrayBuilder, similar to StringBuilder,
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333 // which can't be used here because we can't convert bytes to chars as we read them
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334 // (there might be multi-byte encoding), and we need to collect all bytes before converting to string
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335 ByteArrayOutputStream bos = new ByteArrayOutputStream();
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336 String key = null, value = null;
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337 boolean byteOne = false;
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338 for (int i = 2; i < daLength; i++) {
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339 byte b = da.readByte();
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340 if (b == '\n') {
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341 if (byteOne) { // i.e. \n follows 1
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342 lastEntryStart = i+1;
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343 // XXX is it possible to have here incomplete key/value (i.e. if last pair didn't end with \n)
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344 break;
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345 }
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346 if (key == null || lastColon == -1 || i <= lastColon) {
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347 throw new IllegalStateException(); // FIXME log instead and record null key in the metadata. Ex just to fail fast during dev
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348 }
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349 value = new String(bos.toByteArray()).trim();
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350 bos.reset();
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351 _metadata.add(new MetadataEntry(key, value));
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352 key = value = null;
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353 lastColon = -1;
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354 lastEntryStart = i+1;
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355 continue;
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356 }
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357 // byteOne has to be consumed up to this line, if not jet, consume it
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358 if (byteOne) {
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359 // insert 1 we've read on previous step into the byte builder
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360 bos.write(1);
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361 // fall-through to consume current byte
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362 byteOne = false;
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363 }
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364 if (b == (int) ':') {
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365 assert value == null;
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366 key = new String(bos.toByteArray());
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367 bos.reset();
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368 lastColon = i;
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369 } else if (b == 1) {
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370 byteOne = true;
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371 } else {
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372 bos.write(b);
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373 }
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374 }
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375 _metadata.trimToSize();
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376 metadata.add(revisionNumber, lastEntryStart, _metadata);
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377 if (da.isEmpty() || !byteOne) {
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378 throw new HgDataStreamException(String.format("Metadata for revision %d is not closed properly", revisionNumber), null);
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379 }
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380 // da is in prepared state (i.e. we consumed all bytes up to metadata end).
17
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381 }
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382 }
2
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383 }