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| <div class="title">QueryTermExtractor.cs</div> </div> |
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| <a href="_query_term_extractor_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;</div> |
| <div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="keyword">using</span> System.Collections.Generic;</div> |
| <div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="keyword">using</span> System.IO;</div> |
| <div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="keyword">using</span> System.Linq;</div> |
| <div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="keyword">using</span> Lucene.Net.Index;</div> |
| <div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="keyword">using</span> Lucene.Net.Util;</div> |
| <div class="line"><a name="l00024"></a><span class="lineno"> 24</span> </div> |
| <div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="keyword">namespace </span>Lucene.Net.Search.Highlight</div> |
| <div class="line"><a name="l00026"></a><span class="lineno"> 26</span> {</div> |
| <div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  </div> |
| <div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  <span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">class </span>QueryTermExtractor</div> |
| <div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  {</div> |
| <div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  </div> |
| <div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  <span class="keyword">public</span> <span class="keyword">static</span> WeightedTerm[] GetTerms(<a class="code" href="_more_like_this_8cs.html#accbc7c5687907350ba0e2681b41e1b0d">Query</a> query)</div> |
| <div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  {</div> |
| <div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  <span class="keywordflow">return</span> GetTerms(query, <span class="keyword">false</span>);</div> |
| <div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  }</div> |
| <div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  </div> |
| <div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  <span class="keyword">public</span> <span class="keyword">static</span> WeightedTerm[] GetIdfWeightedTerms(<a class="code" href="_more_like_this_8cs.html#accbc7c5687907350ba0e2681b41e1b0d">Query</a> query, <a class="code" href="class_lucene_1_1_net_1_1_index_1_1_index_reader.html" title="IndexReader is an abstract class, providing an interface for accessing an index. Search of an index i...">IndexReader</a> reader, <span class="keywordtype">string</span> fieldName)</div> |
| <div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  {</div> |
| <div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  WeightedTerm[] terms = GetTerms(query, <span class="keyword">false</span>, fieldName);</div> |
| <div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  <span class="keywordtype">int</span> totalNumDocs = reader.<a class="code" href="class_lucene_1_1_net_1_1_index_1_1_index_reader.html#a300ecbc61b021d9ae600e1b00c61a851" title="Returns the number of documents in this index. ">NumDocs</a>();</div> |
| <div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  <span class="keywordflow">foreach</span> (WeightedTerm t <span class="keywordflow">in</span> terms)</div> |
| <div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  {</div> |
| <div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  <span class="keywordflow">try</span></div> |
| <div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  {</div> |
| <div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  <span class="keywordtype">int</span> docFreq = reader.<a class="code" href="class_lucene_1_1_net_1_1_index_1_1_index_reader.html#a64a1dd38f0e39bd79e5f46ce59ce967b" title="Returns the number of documents containing the term t.">DocFreq</a>(<span class="keyword">new</span> <a class="code" href="_more_like_this_8cs.html#a8797eb30ce21b31829d3e3a43a20e3b9">Term</a>(fieldName, t.Term));</div> |
| <div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  <span class="comment">// docFreq counts deletes</span></div> |
| <div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  <span class="keywordflow">if</span> (totalNumDocs < docFreq)</div> |
| <div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  {</div> |
| <div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  docFreq = totalNumDocs;</div> |
| <div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  }</div> |
| <div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  <span class="comment">//IDF algorithm taken from DefaultSimilarity class</span></div> |
| <div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  var idf = (float)(Math.Log((<span class="keywordtype">float</span>)totalNumDocs / (<span class="keywordtype">double</span>)(docFreq + 1)) + 1.0);</div> |
| <div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  t.Weight *= idf;</div> |
| <div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  }</div> |
| <div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  <span class="keywordflow">catch</span> (IOException e)</div> |
| <div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  {</div> |
| <div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  <span class="comment">//ignore </span></div> |
| <div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  }</div> |
| <div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  }</div> |
| <div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  <span class="keywordflow">return</span> terms;</div> |
| <div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  }</div> |
| <div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  </div> |
| <div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  <span class="keyword">public</span> <span class="keyword">static</span> WeightedTerm[] GetTerms(<a class="code" href="_more_like_this_8cs.html#accbc7c5687907350ba0e2681b41e1b0d">Query</a> query, <span class="keywordtype">bool</span> prohibited, <span class="keywordtype">string</span> fieldName)</div> |
| <div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  {</div> |
| <div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  var terms = <span class="keyword">new</span> HashSet<WeightedTerm>();</div> |
| <div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  <span class="keywordflow">if</span> (fieldName != null)</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>  fieldName = <a class="code" href="class_lucene_1_1_net_1_1_util_1_1_string_helper.html" title="Methods for manipulating strings.">StringHelper</a>.<a class="code" href="class_lucene_1_1_net_1_1_util_1_1_string_helper.html#ae7eedf8109fc57ea8bbb0b35d4b85551" title="Return the same string object for all equal strings ">Intern</a>(fieldName);</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>  GetTerms(query, terms, prohibited, fieldName);</div> |
| <div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  <span class="keywordflow">return</span> terms.ToArray();</div> |
| <div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  }</div> |
| <div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  </div> |
| <div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  <span class="keyword">public</span> <span class="keyword">static</span> WeightedTerm[] GetTerms(<a class="code" href="_more_like_this_8cs.html#accbc7c5687907350ba0e2681b41e1b0d">Query</a> query, <span class="keywordtype">bool</span> prohibited)</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="keywordflow">return</span> GetTerms(query, prohibited, null);</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>  </div> |
| <div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  <span class="comment">//fieldname MUST be interned prior to this call</span></div> |
| <div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  <span class="keyword">private</span> <span class="keyword">static</span> <span class="keywordtype">void</span> GetTerms(<a class="code" href="_more_like_this_8cs.html#accbc7c5687907350ba0e2681b41e1b0d">Query</a> query, HashSet<WeightedTerm> terms, <span class="keywordtype">bool</span> prohibited, <span class="keywordtype">string</span> fieldName)</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="keywordflow">try</span></div> |
| <div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  {</div> |
| <div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  <span class="keywordflow">if</span> (query is <a class="code" href="_more_like_this_8cs.html#ae2b9948961aeea34f9c4e4955536f433">BooleanQuery</a>)</div> |
| <div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  GetTermsFromBooleanQuery((BooleanQuery) query, terms, prohibited, fieldName);</div> |
| <div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  <span class="keywordflow">else</span> <span class="keywordflow">if</span> (query is <a class="code" href="_payload_span_util_8cs.html#a49363f78c70160c950a5ccc78e8d21e4">FilteredQuery</a>)</div> |
| <div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  GetTermsFromFilteredQuery((FilteredQuery) query, terms, prohibited, fieldName);</div> |
| <div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  <span class="keywordflow">else</span></div> |
| <div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  {</div> |
| <div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  var nonWeightedTerms = Support.Compatibility.SetFactory.CreateHashSet<<a class="code" href="class_lucene_1_1_net_1_1_index_1_1_term.html" title="A Term represents a word from text. This is the unit of search. It is composed of two elements...">Term</a>>();</div> |
| <div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  query.ExtractTerms(nonWeightedTerms);</div> |
| <div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  <span class="keywordflow">foreach</span> (var term <span class="keywordflow">in</span> nonWeightedTerms)</div> |
| <div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  {</div> |
| <div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  <span class="keywordflow">if</span> ((fieldName == null) || (term.Field == fieldName))</div> |
| <div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  {</div> |
| <div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  terms.Add(<span class="keyword">new</span> WeightedTerm(query.Boost, term.Text));</div> |
| <div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  }</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>  }</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>  <span class="keywordflow">catch</span> (System.NotSupportedException ignore)</div> |
| <div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  {</div> |
| <div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  <span class="comment">//this is non-fatal for our purposes</span></div> |
| <div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  }</div> |
| <div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  }</div> |
| <div class="line"><a name="l00138"></a><span class="lineno"> 138</span> </div> |
| <div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  <span class="keyword">private</span> <span class="keyword">static</span> <span class="keywordtype">void</span> GetTermsFromBooleanQuery(BooleanQuery query, HashSet<WeightedTerm> terms, <span class="keywordtype">bool</span> prohibited, <span class="keywordtype">string</span> fieldName)</div> |
| <div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  {</div> |
| <div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  <a class="code" href="_more_like_this_8cs.html#a53e74846024ac804f694b882eea1936c">BooleanClause</a>[] queryClauses = query.GetClauses();</div> |
| <div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < queryClauses.Length; i++)</div> |
| <div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  {</div> |
| <div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  <span class="keywordflow">if</span> (prohibited || queryClauses[i].<a class="code" href="_boolean_query_8cs.html#a465cf9485f9f5eca4050230ebdbb8ed4">Occur</a> != <a class="code" href="_boolean_query_8cs.html#a465cf9485f9f5eca4050230ebdbb8ed4">Occur</a>.MUST_NOT)</div> |
| <div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  GetTerms(queryClauses[i].<a class="code" href="_more_like_this_8cs.html#accbc7c5687907350ba0e2681b41e1b0d">Query</a>, terms, prohibited, fieldName);</div> |
| <div class="line"><a name="l00156"></a><span class="lineno"> 156</span>  }</div> |
| <div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  }</div> |
| <div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  <span class="keyword">private</span> <span class="keyword">static</span> <span class="keywordtype">void</span> GetTermsFromFilteredQuery(FilteredQuery query, HashSet<WeightedTerm> terms, <span class="keywordtype">bool</span> prohibited, <span class="keywordtype">string</span> fieldName)</div> |
| <div class="line"><a name="l00159"></a><span class="lineno"> 159</span>  {</div> |
| <div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  GetTerms(query.Query, terms, prohibited, fieldName);</div> |
| <div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  }</div> |
| <div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  }</div> |
| <div class="line"><a name="l00163"></a><span class="lineno"> 163</span> }</div> |
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