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annotate src/org/tmatesoft/hg/repo/HgDataFile.java @ 138:bb1d02f9eff6

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clean fixme comment
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 16 Feb 2011 22:23:30 +0100
parents 3959bffb14e9
children 1a7a9a20e1f9
rev   line source
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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.HgRepository.TIP;
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21 import java.nio.ByteBuffer;
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22 import java.util.ArrayList;
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23 import java.util.Collection;
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24 import java.util.TreeMap;
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26 import org.tmatesoft.hg.core.Nodeid;
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27 import org.tmatesoft.hg.internal.FilterByteChannel;
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28 import org.tmatesoft.hg.internal.RevlogStream;
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29 import org.tmatesoft.hg.util.ByteChannel;
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30 import org.tmatesoft.hg.util.Path;
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33
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34 /**
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35 * ? name:HgFileNode?
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36 *
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37 * @author Artem Tikhomirov
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38 * @author TMate Software Ltd.
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39 */
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40 public class HgDataFile extends Revlog {
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41
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42 // absolute from repo root?
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43 // slashes, unix-style?
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44 // repo location agnostic, just to give info to user, not to access real storage
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45 private final Path path;
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46 private Metadata metadata; // get initialized on first access to file content.
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48 /*package-local*/HgDataFile(HgRepository hgRepo, Path filePath, RevlogStream content) {
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49 super(hgRepo, content);
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50 path = filePath;
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51 }
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53 /*package-local*/HgDataFile(HgRepository hgRepo, Path filePath) {
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54 super(hgRepo);
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55 path = filePath;
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56 }
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58 // 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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59 // it might be confused with files existed before but lately removed.
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60 public boolean exists() {
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61 return content != null; // XXX need better impl
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62 }
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64 // human-readable (i.e. "COPYING", not "store/data/_c_o_p_y_i_n_g.i")
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65 public Path getPath() {
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66 return path; // hgRepo.backresolve(this) -> name?
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67 }
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68
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69 public int length(Nodeid nodeid) {
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70 return content.dataLength(getLocalRevision(nodeid));
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71 }
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72
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73 public byte[] content() {
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74 return content(TIP);
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75 }
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77 /*XXX not sure applyFilters is the best way to do, perhaps, callers shall add filters themselves?*/
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78 public void content(int revision, ByteChannel sink, boolean applyFilters) throws /*TODO typed*/Exception {
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79 byte[] content = content(revision);
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80 ByteBuffer buf = ByteBuffer.allocate(512);
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81 int left = content.length;
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82 int offset = 0;
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83 ByteChannel _sink = applyFilters ? new FilterByteChannel(sink, getRepo().getFiltersFromRepoToWorkingDir(getPath())) : sink;
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84 do {
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85 buf.put(content, offset, Math.min(left, buf.remaining()));
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86 buf.flip();
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87 // XXX I may not rely on returned number of bytes but track change in buf position instead.
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88 int consumed = _sink.write(buf);
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89 buf.compact();
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90 offset += consumed;
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91 left -= consumed;
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92 } while (left > 0);
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93 }
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95 // for data files need to check heading of the file content for possible metadata
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96 // @see http://mercurial.selenic.com/wiki/FileFormats#data.2BAC8-
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97 @Override
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98 public byte[] content(int revision) {
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99 if (revision == TIP) {
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100 revision = getLastRevision();
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101 }
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102 byte[] data = super.content(revision);
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103 if (metadata == null) {
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104 metadata = new Metadata();
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105 }
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106 if (metadata.none(revision)) {
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107 // although not very reasonable when data is byte array, this check might
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108 // get handy when there's a stream/channel to avoid useless reads and rewinds.
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109 return data;
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110 }
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111 int toSkip = 0;
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112 if (!metadata.known(revision)) {
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113 if (data.length < 4 || (data[0] != 1 && data[1] != 10)) {
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114 metadata.recordNone(revision);
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115 return data;
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116 }
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117 int lastEntryStart = 2;
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118 int lastColon = -1;
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119 ArrayList<MetadataEntry> _metadata = new ArrayList<MetadataEntry>();
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120 String key = null, value = null;
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121 for (int i = 2; i < data.length; i++) {
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122 if (data[i] == (int) ':') {
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123 key = new String(data, lastEntryStart, i - lastEntryStart);
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124 lastColon = i;
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125 } else if (data[i] == '\n') {
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126 if (key == null || lastColon == -1 || i <= lastColon) {
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127 throw new IllegalStateException(); // FIXME log instead and record null key in the metadata. Ex just to fail fast during dev
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128 }
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129 value = new String(data, lastColon + 1, i - lastColon - 1).trim();
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130 _metadata.add(new MetadataEntry(key, value));
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131 key = value = null;
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132 lastColon = -1;
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133 lastEntryStart = i+1;
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134 } else if (data[i] == 1 && i + 1 < data.length && data[i+1] == 10) {
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135 if (key != null && lastColon != -1 && i > lastColon) {
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136 // just in case last entry didn't end with newline
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137 value = new String(data, lastColon + 1, i - lastColon - 1);
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138 _metadata.add(new MetadataEntry(key, value));
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139 }
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140 lastEntryStart = i+1;
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141 break;
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142 }
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143 }
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144 _metadata.trimToSize();
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145 metadata.add(revision, lastEntryStart, _metadata);
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146 toSkip = lastEntryStart;
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147 } else {
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148 toSkip = metadata.dataOffset(revision);
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149 }
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150 // XXX copy of an array may be memory-hostile, a wrapper with baseOffsetShift(lastEntryStart) would be more convenient
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151 byte[] rv = new byte[data.length - toSkip];
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152 System.arraycopy(data, toSkip, rv, 0, rv.length);
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153 return rv;
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154 }
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155
129
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156 public void history(HgChangelog.Inspector inspector) {
135
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157 history(0, getLastRevision(), inspector);
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158 }
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159
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160 public void history(int start, int end, HgChangelog.Inspector inspector) {
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161 if (!exists()) {
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162 throw new IllegalStateException("Can't get history of invalid repository file node");
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163 }
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164 final int last = getLastRevision();
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165 if (start < 0 || start > last) {
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166 throw new IllegalArgumentException();
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167 }
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168 if (end == TIP) {
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169 end = last;
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170 } else if (end < start || end > last) {
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171 throw new IllegalArgumentException();
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172 }
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173 final int[] commitRevisions = new int[end - start + 1];
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174 RevlogStream.Inspector insp = new RevlogStream.Inspector() {
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175 int count = 0;
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176
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177 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, byte[] data) {
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178 commitRevisions[count++] = linkRevision;
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179 }
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180 };
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181 content.iterate(start, end, false, insp);
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182 getRepo().getChangelog().range(inspector, commitRevisions);
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183 }
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184
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185 // for a given local revision of the file, find out local revision in the changelog
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186 public int getChangesetLocalRevision(int revision) {
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187 return content.linkRevision(revision);
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188 }
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189
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190 public Nodeid getChangesetRevision(Nodeid nid) {
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191 int changelogRevision = getChangesetLocalRevision(getLocalRevision(nid));
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192 return getRepo().getChangelog().getRevision(changelogRevision);
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193 }
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194
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195 public boolean isCopy() {
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196 if (metadata == null || !metadata.checked(0)) {
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197 // content() always initializes metadata.
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198 content(0); // FIXME expensive way to find out metadata, distinct RevlogStream.Iterator would be better.
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199 }
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200 if (!metadata.known(0)) {
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201 return false;
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202 }
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203 return metadata.find(0, "copy") != null;
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204 }
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205
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206 public Path getCopySourceName() {
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207 if (isCopy()) {
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208 return Path.create(metadata.find(0, "copy"));
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209 }
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210 throw new UnsupportedOperationException(); // XXX REVISIT, think over if Exception is good (clients would check isCopy() anyway, perhaps null is sufficient?)
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211 }
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212
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213 public Nodeid getCopySourceRevision() {
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214 if (isCopy()) {
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215 return Nodeid.fromAscii(metadata.find(0, "copyrev")); // XXX reuse/cache Nodeid
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216 }
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217 throw new UnsupportedOperationException();
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218 }
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219
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220 @Override
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221 public String toString() {
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222 StringBuilder sb = new StringBuilder(getClass().getSimpleName());
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223 sb.append('(');
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224 sb.append(getPath());
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225 sb.append(')');
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226 return sb.toString();
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227 }
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228
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229 private static final class MetadataEntry {
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230 private final String entry;
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231 private final int valueStart;
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232 /*package-local*/MetadataEntry(String key, String value) {
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233 entry = key + value;
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234 valueStart = key.length();
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235 }
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236 /*package-local*/boolean matchKey(String key) {
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237 return key.length() == valueStart && entry.startsWith(key);
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238 }
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239 // uncomment once/if needed
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240 // public String key() {
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241 // return entry.substring(0, valueStart);
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242 // }
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243 public String value() {
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244 return entry.substring(valueStart);
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245 }
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246 }
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247
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248 private static class Metadata {
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249 // XXX sparse array needed
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250 private final TreeMap<Integer, Integer> offsets = new TreeMap<Integer, Integer>();
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251 private final TreeMap<Integer, MetadataEntry[]> entries = new TreeMap<Integer, MetadataEntry[]>();
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252
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253 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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254
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255 // true when there's metadata for given revision
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256 boolean known(int revision) {
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257 Integer i = offsets.get(revision);
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258 return i != null && NONE != i;
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259 }
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260
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261 // true when revision has been checked for metadata presence.
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262 public boolean checked(int revision) {
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263 return offsets.containsKey(revision);
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264 }
134
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265
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266 // true when revision has been checked and found not having any metadata
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267 boolean none(int revision) {
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268 Integer i = offsets.get(revision);
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269 return i == NONE;
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270 }
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271
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272 // mark revision as having no metadata.
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273 void recordNone(int revision) {
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274 Integer i = offsets.get(revision);
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275 if (i == NONE) {
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276 return; // already there
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277 }
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278 if (i != null) {
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279 throw new IllegalStateException(String.format("Trying to override Metadata state for revision %d (known offset: %d)", revision, i));
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280 }
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281 offsets.put(revision, NONE);
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282 }
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283
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284 // since this is internal class, callers are supposed to ensure arg correctness (i.e. ask known() before)
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285 int dataOffset(int revision) {
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286 return offsets.get(revision);
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287 }
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288 void add(int revision, int dataOffset, Collection<MetadataEntry> e) {
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289 assert !offsets.containsKey(revision);
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290 offsets.put(revision, dataOffset);
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291 entries.put(revision, e.toArray(new MetadataEntry[e.size()]));
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292 }
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293 String find(int revision, String key) {
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294 for (MetadataEntry me : entries.get(revision)) {
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295 if (me.matchKey(key)) {
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296 return me.value();
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297 }
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298 }
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299 return null;
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300 }
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301 }
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302 }