Mercurial > hg4j

annotate hg4j/src/main/java/org/tmatesoft/hg/internal/KeywordFilter.java @ 213:6ec4af642ba8 gradle

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Project uses Gradle for build - actual changes
author Alexander Kitaev <kitaev@gmail.com>
date Tue, 10 May 2011 10:52:53 +0200
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213
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1 /*
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2 * Copyright (c) 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.internal;
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18
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19 import java.nio.ByteBuffer;
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20 import java.util.ArrayList;
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21 import java.util.Map;
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22 import java.util.TreeMap;
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23
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24 import org.tmatesoft.hg.repo.HgChangelog.RawChangeset;
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25 import org.tmatesoft.hg.repo.HgRepository;
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26 import org.tmatesoft.hg.util.Path;
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27
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28 /**
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29 *
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30 * @author Artem Tikhomirov
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31 * @author TMate Software Ltd.
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32 */
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33 public class KeywordFilter implements Filter {
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34 // present implementation is stateless, however, filter use pattern shall not assume that. In fact, Factory may us that
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35 private final HgRepository repo;
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36 private final boolean isExpanding;
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37 private final TreeMap<String,String> keywords;
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38 private final int minBufferLen;
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39 private final Path path;
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40 private RawChangeset latestFileCset;
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41
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42 /**
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43 *
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44 * @param hgRepo
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45 * @param path
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46 * @param expand <code>true</code> to expand keywords, <code>false</code> to shrink
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47 */
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48 private KeywordFilter(HgRepository hgRepo, Path p, boolean expand) {
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49 repo = hgRepo;
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50 path = p;
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51 isExpanding = expand;
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52 keywords = new TreeMap<String,String>();
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53 keywords.put("Id", "Id");
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54 keywords.put("Revision", "Revision");
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55 keywords.put("Author", "Author");
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56 keywords.put("Date", "Date");
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57 keywords.put("LastChangedRevision", "LastChangedRevision");
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58 keywords.put("LastChangedBy", "LastChangedBy");
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59 keywords.put("LastChangedDate", "LastChangedDate");
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60 keywords.put("Source", "Source");
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61 keywords.put("Header", "Header");
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62
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63 int l = 0;
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64 for (String s : keywords.keySet()) {
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65 if (s.length() > l) {
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66 l = s.length();
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67 }
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68 }
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69 // FIXME later may implement #filter() not to read full kw value (just "$kw:"). However, limit of maxLen + 2 would keep valid.
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70 // for buffers less then minBufferLen, there are chances #filter() implementation would never end
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71 // (i.e. for input "$LongestKey"$
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72 minBufferLen = l + 2 + (isExpanding ? 0 : 120 /*any reasonable constant for max possible kw value length*/);
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73 }
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74
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75 /**
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76 * @param src buffer ready to be read
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77 * @return buffer ready to be read and original buffer's position modified to reflect consumed bytes. IOW, if source buffer
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78 * on return has remaining bytes, they are assumed not-read (not processed) and next chunk passed to filter is supposed to
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79 * start with them
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80 */
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81 public ByteBuffer filter(ByteBuffer src) {
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82 if (src.capacity() < minBufferLen) {
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83 throw new IllegalStateException(String.format("Need buffer of at least %d bytes to ensure filter won't hang", minBufferLen));
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84 }
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85 ByteBuffer rv = null;
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86 int keywordStart = -1;
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87 int x = src.position();
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88 int copyFrom = x; // needs to be updated each time we copy a slice, but not each time we modify source index (x)
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89 while (x < src.limit()) {
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90 if (keywordStart == -1) {
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91 int i = indexOf(src, '$', x, false);
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92 if (i == -1) {
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93 if (rv == null) {
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94 return src;
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95 } else {
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96 copySlice(src, copyFrom, src.limit(), rv);
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97 rv.flip();
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98 src.position(src.limit());
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99 return rv;
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100 }
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101 }
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102 keywordStart = i;
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103 // fall-through
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104 }
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105 if (keywordStart >= 0) {
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106 int i = indexOf(src, '$', keywordStart+1, true);
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107 if (i == -1) {
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108 // end of buffer reached
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109 if (rv == null) {
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110 if (keywordStart == x) {
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111 // FIXME in fact, x might be equal to keywordStart and to src.position() here ('$' is first character in the buffer,
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112 // and there are no other '$' not eols till the end of the buffer). This would lead to deadlock (filter won't consume any
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113 // bytes). To prevent this, either shall copy bytes [keywordStart..buffer.limit()) to local buffer and use it on the next invocation,
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114 // or add lookup of the keywords right after first '$' is found (do not wait for closing '$'). For now, large enough src buffer would be sufficient
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115 // not to run into such situation
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116 throw new IllegalStateException("Try src buffer of a greater size");
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117 }
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118 rv = ByteBuffer.allocate(keywordStart - copyFrom);
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119 }
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120 // copy all from source till latest possible kw start
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121 copySlice(src, copyFrom, keywordStart, rv);
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122 rv.flip();
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123 // and tell caller we've consumed only to the potential kw start
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124 src.position(keywordStart);
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125 return rv;
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126 } else if (src.get(i) == '$') {
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127 // end of keyword, or start of a new one.
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128 String keyword;
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129 if ((keyword = matchKeyword(src, keywordStart, i)) != null) {
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130 if (rv == null) {
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131 // src.remaining(), not .capacity because src is not read, and remaining represents
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132 // actual bytes count, while capacity - potential.
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133 // Factor of 4 is pure guess and a HACK, need to be fixed with re-expanding buffer on demand
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134 rv = ByteBuffer.allocate(isExpanding ? src.remaining() * 4 : src.remaining());
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135 }
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136 copySlice(src, copyFrom, keywordStart+1, rv);
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137 rv.put(keyword.getBytes());
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138 if (isExpanding) {
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139 rv.put((byte) ':');
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140 rv.put((byte) ' ');
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141 expandKeywordValue(keyword, rv);
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142 rv.put((byte) ' ');
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143 }
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144 rv.put((byte) '$');
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145 keywordStart = -1;
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146 x = i+1;
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147 copyFrom = x;
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148 continue;
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149 } else {
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150 if (rv != null) {
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151 // we've already did some substitution, thus need to copy bytes we've scanned.
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152 copySlice(src, x, i, rv);
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153 copyFrom = i;
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154 } // no else in attempt to avoid rv creation if no real kw would be found
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155 keywordStart = i;
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156 x = i; // '$' at i wasn't consumed, hence x points to i, not i+1. This is to avoid problems with case: "sdfsd $ asdfs $Id$ sdf"
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157 continue;
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158 }
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159 } else {
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160 assert src.get(i) == '\n' || src.get(i) == '\r';
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161 // line break
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162 if (rv != null) {
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163 copySlice(src, x, i+1, rv);
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164 copyFrom = i+1;
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165 }
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166 x = i+1;
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167 keywordStart = -1; // Wasn't keyword, really
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168 continue; // try once again
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169 }
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170 }
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171 }
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172 if (keywordStart != -1) {
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173 if (rv == null) {
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174 // no expansion happened yet, and we have potential kw start
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175 rv = ByteBuffer.allocate(keywordStart - src.position());
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176 copySlice(src, src.position(), keywordStart, rv);
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177 }
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178 src.position(keywordStart);
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179 }
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180 if (rv != null) {
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181 rv.flip();
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182 return rv;
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183 }
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184 return src;
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185 }
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186
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187 /**
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188 * @param keyword
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189 * @param rv
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190 */
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191 private void expandKeywordValue(String keyword, ByteBuffer rv) {
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192 if ("Id".equals(keyword)) {
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193 rv.put(identityString().getBytes());
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194 } else if ("Revision".equals(keyword)) {
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195 rv.put(revision().getBytes());
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196 } else if ("Author".equals(keyword)) {
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197 rv.put(username().getBytes());
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198 } else if ("Date".equals(keyword)) {
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199 rv.put(date().getBytes());
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200 } else {
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201 throw new IllegalStateException(String.format("Keyword %s is not yet supported", keyword));
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202 }
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203 }
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204
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205 private String matchKeyword(ByteBuffer src, int kwStart, int kwEnd) {
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206 assert kwEnd - kwStart - 1 > 0;
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207 assert src.get(kwStart) == src.get(kwEnd) && src.get(kwEnd) == '$';
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208 char[] chars = new char[kwEnd - kwStart - 1];
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209 int i;
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210 for (i = 0; i < chars.length; i++) {
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211 char c = (char) src.get(kwStart + 1 + i);
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212 if (c == ':') {
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213 break;
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214 }
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215 chars[i] = c;
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216 }
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217 String kw = new String(chars, 0, i);
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218 // XXX may use subMap to look up keywords based on few available characters (not waiting till closing $)
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219 // System.out.println(keywords.subMap("I", "J"));
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220 // System.out.println(keywords.subMap("A", "B"));
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221 // System.out.println(keywords.subMap("Au", "B"));
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222 return keywords.get(kw);
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223 }
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224
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225 // copies part of the src buffer, [from..to). doesn't modify src position
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226 static void copySlice(ByteBuffer src, int from, int to, ByteBuffer dst) {
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227 if (to > src.limit()) {
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228 throw new IllegalArgumentException("Bad right boundary");
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229 }
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230 if (dst.remaining() < to - from) {
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231 throw new IllegalArgumentException("Not enough room in the destination buffer");
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232 }
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233 for (int i = from; i < to; i++) {
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234 dst.put(src.get(i));
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235 }
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236 }
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237
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238 private static int indexOf(ByteBuffer b, char ch, int from, boolean newlineBreaks) {
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239 for (int i = from; i < b.limit(); i++) {
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240 byte c = b.get(i);
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241 if (ch == c) {
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242 return i;
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243 }
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244 if (newlineBreaks && (c == '\n' || c == '\r')) {
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245 return i;
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246 }
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247 }
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248 return -1;
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249 }
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250
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251 private String identityString() {
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252 return String.format("%s,v %s %s %s", path, revision(), date(), username());
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253 }
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254
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255 private String revision() {
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256 // FIXME add cset's nodeid into Changeset class
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257 int csetRev = repo.getFileNode(path).getChangesetLocalRevision(HgRepository.TIP);
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258 return repo.getChangelog().getRevision(csetRev).shortNotation();
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259 }
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260
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261 private String username() {
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262 return getChangeset().user();
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263 }
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264
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265 private String date() {
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266 return String.format("%tY/%<tm/%<td %<tH:%<tM:%<tS", getChangeset().date());
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267 }
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268
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269 private RawChangeset getChangeset() {
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270 if (latestFileCset == null) {
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271 // XXX consider use of ChangelogHelper
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272 int csetRev = repo.getFileNode(path).getChangesetLocalRevision(HgRepository.TIP);
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273 latestFileCset = repo.getChangelog().range(csetRev, csetRev).get(0);
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274 }
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275 return latestFileCset;
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276 }
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277
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278 public static class Factory implements Filter.Factory {
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279
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280 private HgRepository repo;
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281 private Path.Matcher matcher;
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282
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283 public void initialize(HgRepository hgRepo, ConfigFile cfg) {
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284 repo = hgRepo;
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285 ArrayList<String> patterns = new ArrayList<String>();
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286 for (Map.Entry<String,String> e : cfg.getSection("keyword").entrySet()) {
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287 if (!"ignore".equalsIgnoreCase(e.getValue())) {
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288 patterns.add(e.getKey());
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289 }
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290 }
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291 matcher = new PathGlobMatcher(patterns.toArray(new String[patterns.size()]));
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292 // TODO read and respect keyword patterns from [keywordmaps]
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293 }
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294
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295 public Filter create(Path path, Options opts) {
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296 if (matcher.accept(path)) {
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297 return new KeywordFilter(repo, path, opts.getDirection() == Filter.Direction.FromRepo);
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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
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303 //
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304 // public static void main(String[] args) throws Exception {
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305 // FileInputStream fis = new FileInputStream(new File("/temp/kwoutput.txt"));
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306 // FileOutputStream fos = new FileOutputStream(new File("/temp/kwoutput2.txt"));
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307 // ByteBuffer b = ByteBuffer.allocate(256);
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308 // KeywordFilter kwFilter = new KeywordFilter(false);
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309 // while (fis.getChannel().read(b) != -1) {
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310 // b.flip(); // get ready to be read
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311 // ByteBuffer f = kwFilter.filter(b);
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312 // fos.getChannel().write(f); // XXX in fact, f may not be fully consumed
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313 // if (b.hasRemaining()) {
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314 // b.compact();
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315 // } else {
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316 // b.clear();
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317 // }
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318 // }
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319 // fis.close();
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320 // fos.flush();
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321 // fos.close();
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322 // }
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323 }