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<div class="title">StopFilter.cs</div> </div>
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<a href="_stop_filter_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>&#160;<span class="comment">/* </span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span>&#160;<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>&#160;<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>&#160;<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>&#160;<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>&#160;<span class="comment"> * (the &quot;License&quot;); you may not use this file except in compliance with</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span>&#160;<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>&#160;<span class="comment"> * </span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span>&#160;<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>&#160;<span class="comment"> * </span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span>&#160;<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>&#160;<span class="comment"> * distributed under the License is distributed on an &quot;AS IS&quot; BASIS,</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span>&#160;<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>&#160;<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>&#160;<span class="comment"> * limitations under the License.</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span>&#160;</div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span>&#160;<span class="keyword">using</span> System;</div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span>&#160;<span class="keyword">using</span> System.Collections.Generic;</div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span>&#160;<span class="keyword">using</span> Lucene.Net.Analysis.Tokenattributes;</div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span>&#160;<span class="keyword">using</span> Lucene.Net.Util;</div>
<div class="line"><a name="l00022"></a><span class="lineno"><a class="code" href="_stop_filter_8cs.html#a60340f60ee092cf9082b16fe7b2ed03f"> 22</a></span>&#160;<span class="keyword">using</span> <a class="code" href="_stop_filter_8cs.html#a60340f60ee092cf9082b16fe7b2ed03f">QueryParser</a> = Lucene.Net.QueryParsers.QueryParser;</div>
<div class="line"><a name="l00023"></a><span class="lineno"><a class="code" href="_stop_filter_8cs.html#a63c914dcb7d19365ff0f7c6ea7ef77c4"> 23</a></span>&#160;<span class="keyword">using</span> <a class="code" href="namespace_lucene_1_1_net_1_1_util.html#a92602ef4dd5a04278f4b62379d552c0b" title="Use by certain classes to match version compatibility across releases of Lucene. WARNING: When changi...">Version</a> = Lucene.Net.Util.Version;</div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>&#160;</div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span>&#160;<span class="keyword">namespace </span>Lucene.Net.Analysis</div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>&#160;{</div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>&#160; </div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>&#160; </div>
<div class="line"><a name="l00030"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_stop_filter.html"> 30</a></span>&#160; <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_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_token_filter.html" title="A TokenFilter is a TokenStream whose input is another TokenStream. This is an abstract class; subclas...">TokenFilter</a></div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>&#160; {</div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>&#160; <span class="keyword">private</span> readonly <a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_char_array_set.html" title="A simple class that stores Strings as char[]&#39;s in a hash table. Note that this is not a general purpo...">CharArraySet</a> stopWords;</div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>&#160; <span class="keyword">private</span> <span class="keywordtype">bool</span> enablePositionIncrements = <span class="keyword">false</span>;</div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>&#160; </div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>&#160; <span class="keyword">private</span> readonly <a class="code" href="interface_lucene_1_1_net_1_1_analysis_1_1_tokenattributes_1_1_i_term_attribute.html" title="The term text of a Token.">ITermAttribute</a> termAtt;</div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>&#160; <span class="keyword">private</span> readonly <a class="code" href="interface_lucene_1_1_net_1_1_analysis_1_1_tokenattributes_1_1_i_position_increment_attribute.html" title="The positionIncrement determines the position of this token relative to the previous Token in a Token...">IPositionIncrementAttribute</a> posIncrAtt;</div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>&#160; </div>
<div class="line"><a name="l00052"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_stop_filter.html#aa37ff95fc3a6aaedd3f6d4d72de0a217"> 52</a></span>&#160; <span class="keyword">public</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>(<span class="keywordtype">bool</span> enablePositionIncrements, <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> input, ISet&lt;string&gt; stopWords, <span class="keywordtype">bool</span> ignoreCase)</div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>&#160; : base(input)</div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>&#160; {</div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>&#160; <span class="keywordflow">if</span> (stopWords is <a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_char_array_set.html" title="A simple class that stores Strings as char[]&#39;s in a hash table. Note that this is not a general purpo...">CharArraySet</a>)</div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>&#160; {</div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>&#160; this.stopWords = (CharArraySet) stopWords;</div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>&#160; }</div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>&#160; <span class="keywordflow">else</span></div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>&#160; {</div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>&#160; this.stopWords = <span class="keyword">new</span> CharArraySet(stopWords.Count, ignoreCase);</div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>&#160; this.stopWords.AddAll(stopWords);</div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>&#160; }</div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>&#160; this.enablePositionIncrements = enablePositionIncrements;</div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>&#160; termAtt = AddAttribute&lt;ITermAttribute&gt;();</div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>&#160; posIncrAtt = AddAttribute&lt;IPositionIncrementAttribute&gt;();</div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>&#160; }</div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>&#160;</div>
<div class="line"><a name="l00076"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_stop_filter.html#ab41c25f97e74d3fa9b74b458fd7adc29"> 76</a></span>&#160; <span class="keyword">public</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>(<span class="keywordtype">bool</span> enablePositionIncrements, <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> @in, ISet&lt;string&gt; stopWords)</div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>&#160; : this(enablePositionIncrements, @in, stopWords, false)</div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>&#160; { }</div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>&#160; </div>
<div class="line"><a name="l00087"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_stop_filter.html#a4a5a7cbe2ee7980ed82b9d933b41d7bc"> 87</a></span>&#160; <span class="keyword">public</span> <span class="keyword">static</span> ISet&lt;string&gt; MakeStopSet(params <span class="keywordtype">string</span>[] stopWords)</div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>&#160; {</div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>&#160; <span class="keywordflow">return</span> MakeStopSet(stopWords, <span class="keyword">false</span>);</div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>&#160; }</div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>&#160; </div>
<div class="line"><a name="l00099"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_stop_filter.html#acc998047003b0830d2d724bc1cdf2ada"> 99</a></span>&#160; <span class="keyword">public</span> <span class="keyword">static</span> ISet&lt;string&gt; MakeStopSet(IList&lt;object&gt; stopWords)</div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>&#160; {</div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>&#160; <span class="keywordflow">return</span> MakeStopSet(stopWords, <span class="keyword">false</span>);</div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>&#160; }</div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>&#160; </div>
<div class="line"><a name="l00108"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_stop_filter.html#a9d0d9b5512634a2622b8899dcd6bcd3f"> 108</a></span>&#160; <span class="keyword">public</span> <span class="keyword">static</span> ISet&lt;string&gt; MakeStopSet(<span class="keywordtype">string</span>[] stopWords, <span class="keywordtype">bool</span> ignoreCase)</div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>&#160; {</div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>&#160; var stopSet = <span class="keyword">new</span> <a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_char_array_set.html" title="A simple class that stores Strings as char[]&#39;s in a hash table. Note that this is not a general purpo...">CharArraySet</a>(stopWords.Length, ignoreCase);</div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>&#160; stopSet.AddAll(stopWords);</div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>&#160; <span class="keywordflow">return</span> stopSet;</div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>&#160; }</div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>&#160; </div>
<div class="line"><a name="l00119"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_stop_filter.html#a5f1b5d6835c8967843bf48cd590894ce"> 119</a></span>&#160; <span class="keyword">public</span> <span class="keyword">static</span> ISet&lt;string&gt; MakeStopSet(IList&lt;object&gt; stopWords, <span class="keywordtype">bool</span> ignoreCase)</div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>&#160; {</div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>&#160; var stopSet = <span class="keyword">new</span> <a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_char_array_set.html" title="A simple class that stores Strings as char[]&#39;s in a hash table. Note that this is not a general purpo...">CharArraySet</a>(stopWords.Count, ignoreCase);</div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>&#160; <span class="keywordflow">foreach</span>(var word <span class="keywordflow">in</span> stopWords)</div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>&#160; stopSet.Add(word.ToString());</div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>&#160; <span class="keywordflow">return</span> stopSet;</div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>&#160; }</div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>&#160; </div>
<div class="line"><a name="l00128"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_stop_filter.html#a0ed3bea416f49c24e305ca6ef703f799"> 128</a></span>&#160; <span class="keyword">public</span> <span class="keyword">override</span> <span class="keywordtype">bool</span> IncrementToken()</div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>&#160; {</div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>&#160; <span class="comment">// return the first non-stop word found</span></div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>&#160; <span class="keywordtype">int</span> skippedPositions = 0;</div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span>&#160; <span class="keywordflow">while</span> (input.IncrementToken())</div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>&#160; {</div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>&#160; <span class="keywordflow">if</span> (!stopWords.Contains(termAtt.TermBuffer(), 0, termAtt.TermLength()))</div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>&#160; {</div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span>&#160; <span class="keywordflow">if</span> (enablePositionIncrements)</div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>&#160; {</div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>&#160; posIncrAtt.PositionIncrement = posIncrAtt.PositionIncrement + skippedPositions;</div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>&#160; }</div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>&#160; <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>&#160; }</div>
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span>&#160; skippedPositions += posIncrAtt.PositionIncrement;</div>
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span>&#160; }</div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span>&#160; <span class="comment">// reached EOS -- return false</span></div>
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>&#160; <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span>&#160; }</div>
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>&#160; </div>
<div class="line"><a name="l00152"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_stop_filter.html#ab11fb0a8f9564b60ae61e29bef912ca8"> 152</a></span>&#160; <span class="keyword">public</span> <span class="keyword">static</span> <span class="keywordtype">bool</span> GetEnablePositionIncrementsVersionDefault(<a class="code" href="namespace_lucene_1_1_net_1_1_util.html#a92602ef4dd5a04278f4b62379d552c0b" title="Use by certain classes to match version compatibility across releases of Lucene. WARNING: When changi...">Version</a> matchVersion)</div>
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span>&#160; {</div>
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span>&#160; <span class="keywordflow">return</span> matchVersion.OnOrAfter(<a class="code" href="namespace_lucene_1_1_net_1_1_util.html#a92602ef4dd5a04278f4b62379d552c0b" title="Use by certain classes to match version compatibility across releases of Lucene. WARNING: When changi...">Version</a>.LUCENE_29);</div>
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span>&#160; }</div>
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span>&#160;</div>
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span>&#160; <span class="keyword">public</span> <span class="keywordtype">bool</span> EnablePositionIncrements</div>
<div class="line"><a name="l00173"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_stop_filter.html#a83199a99aa376c20f55f2bbb2fdb89a1"> 173</a></span>&#160; {</div>
<div class="line"><a name="l00174"></a><span class="lineno"> 174</span>&#160; <span class="keyword">get</span> { <span class="keywordflow">return</span> enablePositionIncrements; }</div>
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span>&#160; <span class="keyword">set</span> { enablePositionIncrements = value; }</div>
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span>&#160; }</div>
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span>&#160; }</div>
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span>&#160;}</div>
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