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annotate src/org/tmatesoft/hg/repo/HgDataFile.java @ 153:ab7ea2ac21cb

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author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 24 Feb 2011 21:38:46 +0100
parents 1a7a9a20e1f9
children d5268ca7715b
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.HgInternals.wrongLocalRevision;
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20 import static org.tmatesoft.hg.repo.HgRepository.*;
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21 import static org.tmatesoft.hg.repo.HgRepository.TIP;
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22 import static org.tmatesoft.hg.repo.HgRepository.WORKING_COPY;
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23
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24 import java.io.IOException;
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25 import java.nio.ByteBuffer;
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26 import java.util.ArrayList;
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27 import java.util.Collection;
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28 import java.util.TreeMap;
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30 import org.tmatesoft.hg.core.HgDataStreamException;
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31 import org.tmatesoft.hg.core.Nodeid;
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32 import org.tmatesoft.hg.internal.FilterByteChannel;
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33 import org.tmatesoft.hg.internal.RevlogStream;
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34 import org.tmatesoft.hg.util.ByteChannel;
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35 import org.tmatesoft.hg.util.CancelSupport;
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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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38 import org.tmatesoft.hg.util.ProgressSupport;
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39
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41
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42 /**
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43 * ? name:HgFileNode?
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44 *
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45 * @author Artem Tikhomirov
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46 * @author TMate Software Ltd.
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47 */
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48 public class HgDataFile extends Revlog {
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49
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50 // absolute from repo root?
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51 // slashes, unix-style?
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52 // repo location agnostic, just to give info to user, not to access real storage
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53 private final Path path;
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54 private Metadata metadata; // get initialized on first access to file content.
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56 /*package-local*/HgDataFile(HgRepository hgRepo, Path filePath, RevlogStream content) {
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57 super(hgRepo, content);
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58 path = filePath;
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59 }
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61 /*package-local*/HgDataFile(HgRepository hgRepo, Path filePath) {
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62 super(hgRepo);
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63 path = filePath;
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64 }
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66 // 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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67 // it might be confused with files existed before but lately removed.
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68 public boolean exists() {
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69 return content != null; // XXX need better impl
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70 }
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72 // human-readable (i.e. "COPYING", not "store/data/_c_o_p_y_i_n_g.i")
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73 public Path getPath() {
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74 return path; // hgRepo.backresolve(this) -> name?
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75 }
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76
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77 public int length(Nodeid nodeid) {
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78 return content.dataLength(getLocalRevision(nodeid));
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79 }
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80
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81 public byte[] content() {
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82 return content(TIP);
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83 }
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85 /*XXX not sure applyFilters is the best way to do, perhaps, callers shall add filters themselves?*/
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86 public void content(int revision, ByteChannel sink, boolean applyFilters) throws HgDataStreamException, IOException, CancelledException {
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87 byte[] content = content(revision);
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88 final CancelSupport cancelSupport = CancelSupport.Factory.get(sink);
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89 final ProgressSupport progressSupport = ProgressSupport.Factory.get(sink);
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90 ByteBuffer buf = ByteBuffer.allocate(512);
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91 int left = content.length;
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92 progressSupport.start(left);
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93 int offset = 0;
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94 cancelSupport.checkCancelled();
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95 ByteChannel _sink = applyFilters ? new FilterByteChannel(sink, getRepo().getFiltersFromRepoToWorkingDir(getPath())) : sink;
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96 do {
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97 buf.put(content, offset, Math.min(left, buf.remaining()));
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98 buf.flip();
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99 cancelSupport.checkCancelled();
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100 // XXX I may not rely on returned number of bytes but track change in buf position instead.
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101 int consumed = _sink.write(buf);
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102 buf.compact();
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103 offset += consumed;
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104 left -= consumed;
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105 progressSupport.worked(consumed);
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106 } while (left > 0);
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107 progressSupport.done(); // XXX shall specify whether #done() is invoked always or only if completed successfully.
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108 }
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109
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110 // for data files need to check heading of the file content for possible metadata
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111 // @see http://mercurial.selenic.com/wiki/FileFormats#data.2BAC8-
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112 @Override
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113 public byte[] content(int revision) {
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114 if (revision == TIP) {
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115 revision = getLastRevision();
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116 }
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117 if (wrongLocalRevision(revision) || revision == BAD_REVISION || revision == WORKING_COPY) {
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118 throw new IllegalArgumentException(String.valueOf(revision));
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119 }
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120 byte[] data = super.content(revision);
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121 if (metadata == null) {
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122 metadata = new Metadata();
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123 }
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124 if (metadata.none(revision)) {
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125 // although not very reasonable when data is byte array, this check might
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126 // get handy when there's a stream/channel to avoid useless reads and rewinds.
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127 return data;
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128 }
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129 int toSkip = 0;
134
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130 if (!metadata.known(revision)) {
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131 if (data.length < 4 || (data[0] != 1 && data[1] != 10)) {
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132 metadata.recordNone(revision);
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133 return data;
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134 }
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135 int lastEntryStart = 2;
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136 int lastColon = -1;
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137 ArrayList<MetadataEntry> _metadata = new ArrayList<MetadataEntry>();
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138 String key = null, value = null;
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139 for (int i = 2; i < data.length; i++) {
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140 if (data[i] == (int) ':') {
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141 key = new String(data, lastEntryStart, i - lastEntryStart);
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142 lastColon = i;
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143 } else if (data[i] == '\n') {
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144 if (key == null || lastColon == -1 || i <= lastColon) {
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145 throw new IllegalStateException(); // FIXME log instead and record null key in the metadata. Ex just to fail fast during dev
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146 }
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147 value = new String(data, lastColon + 1, i - lastColon - 1).trim();
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148 _metadata.add(new MetadataEntry(key, value));
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149 key = value = null;
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150 lastColon = -1;
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151 lastEntryStart = i+1;
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152 } else if (data[i] == 1 && i + 1 < data.length && data[i+1] == 10) {
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153 if (key != null && lastColon != -1 && i > lastColon) {
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154 // just in case last entry didn't end with newline
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155 value = new String(data, lastColon + 1, i - lastColon - 1);
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156 _metadata.add(new MetadataEntry(key, value));
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157 }
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158 lastEntryStart = i+1;
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159 break;
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160 }
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161 }
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162 _metadata.trimToSize();
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163 metadata.add(revision, lastEntryStart, _metadata);
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164 toSkip = lastEntryStart;
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165 } else {
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166 toSkip = metadata.dataOffset(revision);
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167 }
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168 // XXX copy of an array may be memory-hostile, a wrapper with baseOffsetShift(lastEntryStart) would be more convenient
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169 byte[] rv = new byte[data.length - toSkip];
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170 System.arraycopy(data, toSkip, rv, 0, rv.length);
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171 return rv;
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172 }
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173
129
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174 public void history(HgChangelog.Inspector inspector) {
135
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175 history(0, getLastRevision(), inspector);
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176 }
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177
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178 public void history(int start, int end, HgChangelog.Inspector inspector) {
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179 if (!exists()) {
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180 throw new IllegalStateException("Can't get history of invalid repository file node");
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181 }
135
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182 final int last = getLastRevision();
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183 if (start < 0 || start > last) {
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184 throw new IllegalArgumentException();
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185 }
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186 if (end == TIP) {
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187 end = last;
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188 } else if (end < start || end > last) {
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189 throw new IllegalArgumentException();
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190 }
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191 final int[] commitRevisions = new int[end - start + 1];
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192 RevlogStream.Inspector insp = new RevlogStream.Inspector() {
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193 int count = 0;
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194
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195 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, byte[] data) {
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196 commitRevisions[count++] = linkRevision;
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197 }
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198 };
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199 content.iterate(start, end, false, insp);
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200 getRepo().getChangelog().range(inspector, commitRevisions);
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201 }
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202
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203 // for a given local revision of the file, find out local revision in the changelog
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204 public int getChangesetLocalRevision(int revision) {
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205 return content.linkRevision(revision);
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206 }
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207
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208 public Nodeid getChangesetRevision(Nodeid nid) {
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209 int changelogRevision = getChangesetLocalRevision(getLocalRevision(nid));
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210 return getRepo().getChangelog().getRevision(changelogRevision);
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diff changeset
211 }
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212
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213 public boolean isCopy() {
134
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diff changeset
214 if (metadata == null || !metadata.checked(0)) {
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diff changeset
215 // content() always initializes metadata.
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diff changeset
216 content(0); // FIXME expensive way to find out metadata, distinct RevlogStream.Iterator would be better.
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217 }
134
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diff changeset
218 if (!metadata.known(0)) {
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219 return false;
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220 }
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diff changeset
221 return metadata.find(0, "copy") != null;
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diff changeset
222 }
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diff changeset
223
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diff changeset
224 public Path getCopySourceName() {
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diff changeset
225 if (isCopy()) {
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diff changeset
226 return Path.create(metadata.find(0, "copy"));
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diff changeset
227 }
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diff changeset
228 throw new UnsupportedOperationException(); // XXX REVISIT, think over if Exception is good (clients would check isCopy() anyway, perhaps null is sufficient?)
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diff changeset
229 }
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diff changeset
230
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diff changeset
231 public Nodeid getCopySourceRevision() {
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diff changeset
232 if (isCopy()) {
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diff changeset
233 return Nodeid.fromAscii(metadata.find(0, "copyrev")); // XXX reuse/cache Nodeid
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234 }
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diff changeset
235 throw new UnsupportedOperationException();
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diff changeset
236 }
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diff changeset
237
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238 @Override
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239 public String toString() {
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240 StringBuilder sb = new StringBuilder(getClass().getSimpleName());
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241 sb.append('(');
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242 sb.append(getPath());
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243 sb.append(')');
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244 return sb.toString();
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245 }
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246
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247 private static final class MetadataEntry {
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248 private final String entry;
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249 private final int valueStart;
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250 /*package-local*/MetadataEntry(String key, String value) {
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251 entry = key + value;
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252 valueStart = key.length();
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253 }
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254 /*package-local*/boolean matchKey(String key) {
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255 return key.length() == valueStart && entry.startsWith(key);
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256 }
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257 // uncomment once/if needed
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258 // public String key() {
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259 // return entry.substring(0, valueStart);
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260 // }
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261 public String value() {
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262 return entry.substring(valueStart);
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263 }
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264 }
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265
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266 private static class Metadata {
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267 // XXX sparse array needed
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268 private final TreeMap<Integer, Integer> offsets = new TreeMap<Integer, Integer>();
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269 private final TreeMap<Integer, MetadataEntry[]> entries = new TreeMap<Integer, MetadataEntry[]>();
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270
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271 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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272
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273 // true when there's metadata for given revision
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274 boolean known(int revision) {
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275 Integer i = offsets.get(revision);
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276 return i != null && NONE != i;
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277 }
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278
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279 // true when revision has been checked for metadata presence.
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280 public boolean checked(int revision) {
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281 return offsets.containsKey(revision);
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282 }
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283
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284 // true when revision has been checked and found not having any metadata
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285 boolean none(int revision) {
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286 Integer i = offsets.get(revision);
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287 return i == NONE;
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288 }
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289
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290 // mark revision as having no metadata.
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291 void recordNone(int revision) {
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292 Integer i = offsets.get(revision);
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293 if (i == NONE) {
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294 return; // already there
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295 }
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296 if (i != null) {
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297 throw new IllegalStateException(String.format("Trying to override Metadata state for revision %d (known offset: %d)", revision, i));
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298 }
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299 offsets.put(revision, NONE);
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300 }
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301
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302 // since this is internal class, callers are supposed to ensure arg correctness (i.e. ask known() before)
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303 int dataOffset(int revision) {
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304 return offsets.get(revision);
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305 }
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306 void add(int revision, int dataOffset, Collection<MetadataEntry> e) {
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307 assert !offsets.containsKey(revision);
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308 offsets.put(revision, dataOffset);
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309 entries.put(revision, e.toArray(new MetadataEntry[e.size()]));
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310 }
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311 String find(int revision, String key) {
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312 for (MetadataEntry me : entries.get(revision)) {
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313 if (me.matchKey(key)) {
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314 return me.value();
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315 }
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316 }
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317 return null;
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318 }
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319 }
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320 }