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annotate src/org/tmatesoft/hg/repo/HgDataFile.java @ 115:c0cc2535462c

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Introduced channels to pipeline (and easily filter) data streams
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 03 Feb 2011 23:32:08 +0100
parents a3a2e5deb320
children b1d6208fb517
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.core.Path;
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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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32
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33 /**
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34 * ? name:HgFileNode?
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35 *
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36 * @author Artem Tikhomirov
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37 * @author TMate Software Ltd.
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38 */
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39 public class HgDataFile extends Revlog {
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41 // absolute from repo root?
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42 // slashes, unix-style?
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43 // repo location agnostic, just to give info to user, not to access real storage
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44 private final Path path;
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45 private Metadata metadata;
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47 /*package-local*/HgDataFile(HgRepository hgRepo, Path filePath, RevlogStream content) {
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48 super(hgRepo, content);
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49 path = filePath;
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50 }
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52 /*package-local*/HgDataFile(HgRepository hgRepo, Path filePath) {
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53 super(hgRepo);
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54 path = filePath;
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55 }
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56
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57 // 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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58 // it might be confused with files existed before but lately removed.
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59 public boolean exists() {
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60 return content != null; // XXX need better impl
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61 }
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63 // human-readable (i.e. "COPYING", not "store/data/_c_o_p_y_i_n_g.i")
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64 public Path getPath() {
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65 return path; // hgRepo.backresolve(this) -> name?
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66 }
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67
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68 public int length(Nodeid nodeid) {
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69 return content.dataLength(getLocalRevision(nodeid));
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70 }
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71
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72 public byte[] content() {
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73 return content(TIP);
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74 }
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76 public void content(int revision, ByteChannel sink) throws /*TODO typed*/Exception {
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77 byte[] content = content(revision);
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78 ByteBuffer buf = ByteBuffer.allocate(512);
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79 int left = content.length;
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80 int offset = 0;
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81 do {
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82 buf.put(content, offset, Math.min(left, buf.remaining()));
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83 buf.flip();
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84 int consumed = sink.write(buf);
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85 buf.compact();
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86 offset += consumed;
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87 left -= consumed;
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88 } while (left > 0);
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89 }
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91 // for data files need to check heading of the file content for possible metadata
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92 // @see http://mercurial.selenic.com/wiki/FileFormats#data.2BAC8-
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93 @Override
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94 public byte[] content(int revision) {
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95 if (revision == TIP) {
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96 revision = content.revisionCount() - 1; // FIXME maxRevision.
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97 }
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98 byte[] data = super.content(revision);
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99 if (data.length < 4 || (data[0] != 1 && data[1] != 10)) {
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100 return data;
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101 }
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102 int toSkip = 0;
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103 if (metadata == null || !metadata.known(revision)) {
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104 int lastEntryStart = 2;
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105 int lastColon = -1;
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106 ArrayList<MetadataEntry> _metadata = new ArrayList<MetadataEntry>();
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107 String key = null, value = null;
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108 for (int i = 2; i < data.length; i++) {
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109 if (data[i] == (int) ':') {
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110 key = new String(data, lastEntryStart, i - lastEntryStart);
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111 lastColon = i;
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112 } else if (data[i] == '\n') {
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113 if (key == null || lastColon == -1 || i <= lastColon) {
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114 throw new IllegalStateException(); // FIXME log instead and record null key in the metadata. Ex just to fail fast during dev
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115 }
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116 value = new String(data, lastColon + 1, i - lastColon - 1).trim();
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117 _metadata.add(new MetadataEntry(key, value));
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118 key = value = null;
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119 lastColon = -1;
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120 lastEntryStart = i+1;
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121 } else if (data[i] == 1 && i + 1 < data.length && data[i+1] == 10) {
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122 if (key != null && lastColon != -1 && i > lastColon) {
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123 // just in case last entry didn't end with newline
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124 value = new String(data, lastColon + 1, i - lastColon - 1);
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125 _metadata.add(new MetadataEntry(key, value));
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126 }
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127 lastEntryStart = i+1;
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128 break;
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129 }
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130 }
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131 _metadata.trimToSize();
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132 if (metadata == null) {
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133 metadata = new Metadata();
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134 }
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135 metadata.add(revision, lastEntryStart, _metadata);
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136 toSkip = lastEntryStart;
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137 } else {
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138 toSkip = metadata.dataOffset(revision);
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139 }
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140 // XXX copy of an array may be memory-hostile, a wrapper with baseOffsetShift(lastEntryStart) would be more convenient
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141 byte[] rv = new byte[data.length - toSkip];
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142 System.arraycopy(data, toSkip, rv, 0, rv.length);
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143 return rv;
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144 }
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145
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146 public void history(Changeset.Inspector inspector) {
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147 history(0, content.revisionCount() - 1, inspector);
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148 }
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149
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150 public void history(int start, int end, Changeset.Inspector inspector) {
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151 if (!exists()) {
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152 throw new IllegalStateException("Can't get history of invalid repository file node");
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153 }
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154 final int last = content.revisionCount() - 1;
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155 if (start < 0 || start > last) {
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156 throw new IllegalArgumentException();
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157 }
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158 if (end == TIP) {
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159 end = last;
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160 } else if (end < start || end > last) {
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161 throw new IllegalArgumentException();
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162 }
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163 final int[] commitRevisions = new int[end - start + 1];
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164 RevlogStream.Inspector insp = new RevlogStream.Inspector() {
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165 int count = 0;
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166
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167 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, byte[] data) {
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168 commitRevisions[count++] = linkRevision;
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169 }
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170 };
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171 content.iterate(start, end, false, insp);
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172 getRepo().getChangelog().range(inspector, commitRevisions);
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173 }
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174
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175 // for a given local revision of the file, find out local revision in the changelog
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176 public int getChangesetLocalRevision(int revision) {
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177 return content.linkRevision(revision);
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178 }
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179
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180 public Nodeid getChangesetRevision(Nodeid nid) {
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181 int changelogRevision = getChangesetLocalRevision(getLocalRevision(nid));
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182 return getRepo().getChangelog().getRevision(changelogRevision);
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183 }
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184
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185 public boolean isCopy() {
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186 if (metadata == null) {
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187 content(0); // FIXME expensive way to find out metadata, distinct RevlogStream.Iterator would be better.
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188 }
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189 if (metadata == null || !metadata.known(0)) {
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190 return false;
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191 }
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192 return metadata.find(0, "copy") != null;
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193 }
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194
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195 public Path getCopySourceName() {
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196 if (isCopy()) {
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197 return Path.create(metadata.find(0, "copy"));
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198 }
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199 throw new UnsupportedOperationException(); // XXX REVISIT, think over if Exception is good (clients would check isCopy() anyway, perhaps null is sufficient?)
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200 }
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201
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202 public Nodeid getCopySourceRevision() {
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203 if (isCopy()) {
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204 return Nodeid.fromAscii(metadata.find(0, "copyrev")); // XXX reuse/cache Nodeid
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205 }
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206 throw new UnsupportedOperationException();
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207 }
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208
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209 @Override
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210 public String toString() {
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211 StringBuilder sb = new StringBuilder(getClass().getSimpleName());
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212 sb.append('(');
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213 sb.append(getPath());
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214 sb.append(')');
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215 return sb.toString();
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216 }
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217
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218 private static final class MetadataEntry {
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219 private final String entry;
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220 private final int valueStart;
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221 /*package-local*/MetadataEntry(String key, String value) {
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222 entry = key + value;
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223 valueStart = key.length();
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224 }
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225 /*package-local*/boolean matchKey(String key) {
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226 return key.length() == valueStart && entry.startsWith(key);
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227 }
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228 public String key() {
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229 return entry.substring(0, valueStart);
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230 }
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231 public String value() {
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232 return entry.substring(valueStart);
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233 }
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234 }
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235
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236 private static class Metadata {
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237 // XXX sparse array needed
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238 private final TreeMap<Integer, Integer> offsets = new TreeMap<Integer, Integer>();
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239 private final TreeMap<Integer, MetadataEntry[]> entries = new TreeMap<Integer, MetadataEntry[]>();
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240 boolean known(int revision) {
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241 return offsets.containsKey(revision);
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242 }
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243 // since this is internal class, callers are supposed to ensure arg correctness (i.e. ask known() before)
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244 int dataOffset(int revision) {
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245 return offsets.get(revision);
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246 }
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247 void add(int revision, int dataOffset, Collection<MetadataEntry> e) {
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 77
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248 offsets.put(revision, dataOffset);
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249 entries.put(revision, e.toArray(new MetadataEntry[e.size()]));
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250 }
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251 String find(int revision, String key) {
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252 for (MetadataEntry me : entries.get(revision)) {
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253 if (me.matchKey(key)) {
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254 return me.value();
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255 }
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256 }
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257 return null;
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258 }
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259 }
2
08db726a0fb7 Shaping out low-level Hg structures
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260 }