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| <div class="title">StopAnalyzer.cs</div> </div> |
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| <a href="_stop_analyzer_8cs.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">/* </span></div> |
| <div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment"> * Licensed to the Apache Software Foundation (ASF) under one or more</span></div> |
| <div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> * contributor license agreements. See the NOTICE file distributed with</span></div> |
| <div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> * this work for additional information regarding copyright ownership.</span></div> |
| <div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"> * The ASF licenses this file to You under the Apache License, Version 2.0</span></div> |
| <div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> * (the "License"); you may not use this file except in compliance with</span></div> |
| <div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> * the License. You may obtain a copy of the License at</span></div> |
| <div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> * </span></div> |
| <div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"> * http://www.apache.org/licenses/LICENSE-2.0</span></div> |
| <div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"> * </span></div> |
| <div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"> * Unless required by applicable law or agreed to in writing, software</span></div> |
| <div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"> * distributed under the License is distributed on an "AS IS" BASIS,</span></div> |
| <div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span></div> |
| <div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"> * See the License for the specific language governing permissions and</span></div> |
| <div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"> * limitations under the License.</span></div> |
| <div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> */</span></div> |
| <div class="line"><a name="l00017"></a><span class="lineno"> 17</span> </div> |
| <div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="keyword">using</span> System.Collections.Generic;</div> |
| <div class="line"><a name="l00019"></a><span class="lineno"><a class="code" href="_stop_analyzer_8cs.html#a63c914dcb7d19365ff0f7c6ea7ef77c4"> 19</a></span> <span class="keyword">using</span> <a class="code" href="_arabic_analyzer_8cs.html#a63c914dcb7d19365ff0f7c6ea7ef77c4">Version</a> = Lucene.Net.Util.Version;</div> |
| <div class="line"><a name="l00020"></a><span class="lineno"> 20</span> </div> |
| <div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="keyword">namespace </span>Lucene.Net.Analysis</div> |
| <div class="line"><a name="l00022"></a><span class="lineno"> 22</span> {</div> |
| <div class="line"><a name="l00023"></a><span class="lineno"> 23</span>  </div> |
| <div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  </div> |
| <div class="line"><a name="l00036"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_stop_analyzer.html"> 36</a></span>  <span class="keyword">public</span> sealed <span class="keyword">class </span><a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_stop_analyzer.html" title="Filters LetterTokenizer with LowerCaseFilter and StopFilter.">StopAnalyzer</a>:<a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_analyzer.html" title="An Analyzer builds TokenStreams, which analyze text. It thus represents a policy for extracting index...">Analyzer</a></div> |
| <div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  {</div> |
| <div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  <span class="keyword">private</span> readonly ISet<string> stopWords;</div> |
| <div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  <span class="keyword">private</span> readonly <span class="keywordtype">bool</span> enablePositionIncrements;</div> |
| <div class="line"><a name="l00040"></a><span class="lineno"> 40</span> </div> |
| <div class="line"><a name="l00044"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_stop_analyzer.html#a0025ccacf9cc663348b25d827d3a7473"> 44</a></span>  <span class="keyword">public</span> <span class="keyword">static</span> ISet<string> <a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_stop_analyzer.html#a0025ccacf9cc663348b25d827d3a7473" title="An unmodifiable set containing some common English words that are not usually useful for searching...">ENGLISH_STOP_WORDS_SET</a>;</div> |
| <div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  </div> |
| <div class="line"><a name="l00047"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_stop_analyzer.html#a540034d3fe0667805a5d102412c06cae"> 47</a></span>  <span class="keyword">public</span> <a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_stop_analyzer.html" title="Filters LetterTokenizer with LowerCaseFilter and StopFilter.">StopAnalyzer</a>(<a class="code" href="_arabic_analyzer_8cs.html#a63c914dcb7d19365ff0f7c6ea7ef77c4">Version</a> matchVersion)</div> |
| <div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  {</div> |
| <div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  stopWords = ENGLISH_STOP_WORDS_SET;</div> |
| <div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  enablePositionIncrements = <a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_stop_filter.html" title="Removes stop words from a token stream.">StopFilter</a>.<a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_stop_filter.html#ab11fb0a8f9564b60ae61e29bef912ca8" title="Returns version-dependent default for enablePositionIncrements. Analyzers that embed StopFilter use t...">GetEnablePositionIncrementsVersionDefault</a>(matchVersion);</div> |
| <div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  }</div> |
| <div class="line"><a name="l00052"></a><span class="lineno"> 52</span> </div> |
| <div class="line"><a name="l00054"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_stop_analyzer.html#a2ba9306f8b9be193007a36eafc79e6e6"> 54</a></span>  <span class="keyword">public</span> <a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_stop_analyzer.html" title="Filters LetterTokenizer with LowerCaseFilter and StopFilter.">StopAnalyzer</a>(<a class="code" href="_arabic_analyzer_8cs.html#a63c914dcb7d19365ff0f7c6ea7ef77c4">Version</a> matchVersion, ISet<string> stopWords)</div> |
| <div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  {</div> |
| <div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  this.stopWords = stopWords;</div> |
| <div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  enablePositionIncrements = <a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_stop_filter.html" title="Removes stop words from a token stream.">StopFilter</a>.<a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_stop_filter.html#ab11fb0a8f9564b60ae61e29bef912ca8" title="Returns version-dependent default for enablePositionIncrements. Analyzers that embed StopFilter use t...">GetEnablePositionIncrementsVersionDefault</a>(matchVersion);</div> |
| <div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  }</div> |
| <div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  </div> |
| <div class="line"><a name="l00069"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_stop_analyzer.html#a43ba31a1f851f2c7d31c7325fbe3492b"> 69</a></span>  <span class="keyword">public</span> <a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_stop_analyzer.html" title="Filters LetterTokenizer with LowerCaseFilter and StopFilter.">StopAnalyzer</a>(<a class="code" href="_arabic_analyzer_8cs.html#a63c914dcb7d19365ff0f7c6ea7ef77c4">Version</a> matchVersion, System.IO.FileInfo stopwordsFile)</div> |
| <div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  {</div> |
| <div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  stopWords = <a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_wordlist_loader.html" title="Loader for text files that represent a list of stopwords.">WordlistLoader</a>.<a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_wordlist_loader.html#a8c03d44044716caeb31ea634057f164f" title="Loads a text file and adds every line as an entry to a HashSet (omitting leading and trailing whitesp...">GetWordSet</a>(stopwordsFile);</div> |
| <div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  enablePositionIncrements = <a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_stop_filter.html" title="Removes stop words from a token stream.">StopFilter</a>.<a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_stop_filter.html#ab11fb0a8f9564b60ae61e29bef912ca8" title="Returns version-dependent default for enablePositionIncrements. Analyzers that embed StopFilter use t...">GetEnablePositionIncrementsVersionDefault</a>(matchVersion);</div> |
| <div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  }</div> |
| <div class="line"><a name="l00074"></a><span class="lineno"> 74</span> </div> |
| <div class="line"><a name="l00082"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_stop_analyzer.html#a9980fe6ab0196fbe163bd1c07fc4cce8"> 82</a></span>  <span class="keyword">public</span> <a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_stop_analyzer.html" title="Filters LetterTokenizer with LowerCaseFilter and StopFilter.">StopAnalyzer</a>(<a class="code" href="_arabic_analyzer_8cs.html#a63c914dcb7d19365ff0f7c6ea7ef77c4">Version</a> matchVersion, System.IO.TextReader stopwords)</div> |
| <div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  {</div> |
| <div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  stopWords = <a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_wordlist_loader.html" title="Loader for text files that represent a list of stopwords.">WordlistLoader</a>.<a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_wordlist_loader.html#a8c03d44044716caeb31ea634057f164f" title="Loads a text file and adds every line as an entry to a HashSet (omitting leading and trailing whitesp...">GetWordSet</a>(stopwords);</div> |
| <div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  enablePositionIncrements = <a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_stop_filter.html" title="Removes stop words from a token stream.">StopFilter</a>.<a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_stop_filter.html#ab11fb0a8f9564b60ae61e29bef912ca8" title="Returns version-dependent default for enablePositionIncrements. Analyzers that embed StopFilter use t...">GetEnablePositionIncrementsVersionDefault</a>(matchVersion);</div> |
| <div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  }</div> |
| <div class="line"><a name="l00087"></a><span class="lineno"> 87</span> </div> |
| <div class="line"><a name="l00089"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_stop_analyzer.html#a97a8240c8e4f19b8e74f598e1f35a7af"> 89</a></span>  <span class="keyword">public</span> <span class="keyword">override</span> <a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_token_stream.html" title="A TokenStream enumerates the sequence of tokens, either from Fields of a Document or from query text...">TokenStream</a> <a class="code" href="_more_like_this_8cs.html#a205730fc8c2839cf92051d131140dae0">TokenStream</a>(System.String fieldName, System.IO.TextReader reader)</div> |
| <div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  {</div> |
| <div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  <span class="keywordflow">return</span> <span class="keyword">new</span> <a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_stop_filter.html" title="Removes stop words from a token stream.">StopFilter</a>(enablePositionIncrements, <span class="keyword">new</span> <a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_lower_case_tokenizer.html" title="LowerCaseTokenizer performs the function of LetterTokenizer and LowerCaseFilter together. It divides text at non-letters and converts them to lower case. While it is functionally equivalent to the combination of LetterTokenizer and LowerCaseFilter, there is a performance advantage to doing the two tasks at once, hence this (redundant) implementation. Note: this does a decent job for most European languages, but does a terrible job for some Asian languages, where words are not separated by spaces. ">LowerCaseTokenizer</a>(reader), stopWords);</div> |
| <div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  }</div> |
| <div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  </div> |
| <div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  <span class="keyword">private</span> <span class="keyword">class </span>SavedStreams</div> |
| <div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  {</div> |
| <div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  <span class="keyword">public</span> SavedStreams(<a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_stop_analyzer.html" title="Filters LetterTokenizer with LowerCaseFilter and StopFilter.">StopAnalyzer</a> enclosingInstance)</div> |
| <div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  {</div> |
| <div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  InitBlock(enclosingInstance);</div> |
| <div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  }</div> |
| <div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  <span class="keyword">private</span> <span class="keywordtype">void</span> InitBlock(StopAnalyzer enclosingInstance)</div> |
| <div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  {</div> |
| <div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  this.enclosingInstance = enclosingInstance;</div> |
| <div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  }</div> |
| <div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  <span class="keyword">private</span> StopAnalyzer enclosingInstance;</div> |
| <div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  <span class="keyword">public</span> StopAnalyzer Enclosing_Instance</div> |
| <div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  {</div> |
| <div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  <span class="keyword">get</span></div> |
| <div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  {</div> |
| <div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  <span class="keywordflow">return</span> enclosingInstance;</div> |
| <div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  }</div> |
| <div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  </div> |
| <div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  }</div> |
| <div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  <span class="keyword">internal</span> <a class="code" href="_standard_tokenizer_8cs.html#a800fe4f39a3aa4f5ccac3b845d1edf23">Tokenizer</a> source;</div> |
| <div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  <span class="keyword">internal</span> <a class="code" href="_more_like_this_8cs.html#a205730fc8c2839cf92051d131140dae0">TokenStream</a> result;</div> |
| <div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  }</div> |
| <div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  </div> |
| <div class="line"><a name="l00118"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_stop_analyzer.html#a2621fcbc12118b1932a955c8d1545010"> 118</a></span>  <span class="keyword">public</span> <span class="keyword">override</span> <a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_token_stream.html" title="A TokenStream enumerates the sequence of tokens, either from Fields of a Document or from query text...">TokenStream</a> ReusableTokenStream(System.String fieldName, System.IO.TextReader reader)</div> |
| <div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  {</div> |
| <div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  var streams = (SavedStreams) PreviousTokenStream;</div> |
| <div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  <span class="keywordflow">if</span> (streams == null)</div> |
| <div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  {</div> |
| <div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  streams = <span class="keyword">new</span> SavedStreams(<span class="keyword">this</span>) {source = <span class="keyword">new</span> <a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_lower_case_tokenizer.html" title="LowerCaseTokenizer performs the function of LetterTokenizer and LowerCaseFilter together. It divides text at non-letters and converts them to lower case. While it is functionally equivalent to the combination of LetterTokenizer and LowerCaseFilter, there is a performance advantage to doing the two tasks at once, hence this (redundant) implementation. Note: this does a decent job for most European languages, but does a terrible job for some Asian languages, where words are not separated by spaces. ">LowerCaseTokenizer</a>(reader)};</div> |
| <div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  streams.result = <span class="keyword">new</span> <a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_stop_filter.html" title="Removes stop words from a token stream.">StopFilter</a>(enablePositionIncrements, streams.source, stopWords);</div> |
| <div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  PreviousTokenStream = streams;</div> |
| <div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  }</div> |
| <div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  <span class="keywordflow">else</span></div> |
| <div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  streams.source.Reset(reader);</div> |
| <div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  <span class="keywordflow">return</span> streams.result;</div> |
| <div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  }</div> |
| <div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  <span class="keyword">static</span> <a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_stop_analyzer.html" title="Filters LetterTokenizer with LowerCaseFilter and StopFilter.">StopAnalyzer</a>()</div> |
| <div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  {</div> |
| <div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  {</div> |
| <div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  var stopWords = <span class="keyword">new</span> System.String[]{<span class="stringliteral">"a"</span>, <span class="stringliteral">"an"</span>, <span class="stringliteral">"and"</span>, <span class="stringliteral">"are"</span>, <span class="stringliteral">"as"</span>, <span class="stringliteral">"at"</span>, <span class="stringliteral">"be"</span>, <span class="stringliteral">"but"</span>, <span class="stringliteral">"by"</span>, <span class="stringliteral">"for"</span>, <span class="stringliteral">"if"</span>, <span class="stringliteral">"in"</span>, <span class="stringliteral">"into"</span>, <span class="stringliteral">"is"</span>, <span class="stringliteral">"it"</span>, <span class="stringliteral">"no"</span>, <span class="stringliteral">"not"</span>, <span class="stringliteral">"of"</span>, <span class="stringliteral">"on"</span>, <span class="stringliteral">"or"</span>, <span class="stringliteral">"such"</span>, <span class="stringliteral">"that"</span>, <span class="stringliteral">"the"</span>, <span class="stringliteral">"their"</span>, <span class="stringliteral">"then"</span>, <span class="stringliteral">"there"</span>, <span class="stringliteral">"these"</span>, <span class="stringliteral">"they"</span>, <span class="stringliteral">"this"</span>, <span class="stringliteral">"to"</span>, <span class="stringliteral">"was"</span>, <span class="stringliteral">"will"</span>, <span class="stringliteral">"with"</span>};</div> |
| <div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  var stopSet = <span class="keyword">new</span> CharArraySet(stopWords.Length, <span class="keyword">false</span>);</div> |
| <div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  stopSet.AddAll(stopWords);</div> |
| <div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  ENGLISH_STOP_WORDS_SET = CharArraySet.UnmodifiableSet(stopSet);</div> |
| <div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  }</div> |
| <div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  }</div> |
| <div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  }</div> |
| <div class="line"><a name="l00141"></a><span class="lineno"> 141</span> }</div> |
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