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|  <span id="projectnumber">3.0.3</span> |
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| <li class="navelem"><a class="el" href="dir_1efe588324fc547683bba4a3f1bac847.html">core</a></li><li class="navelem"><a class="el" href="dir_56f9b3c34a852b92179da152ee78b823.html">Search</a></li> </ul> |
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| <div class="title">DefaultSimilarity.cs</div> </div> |
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| <a href="_default_similarity_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> </div> |
| <div class="line"><a name="l00020"></a><span class="lineno"><a class="code" href="_default_similarity_8cs.html#a7e48939924d26d58803de390e852a01c"> 20</a></span> <span class="keyword">using</span> <a class="code" href="_fieldable_8cs.html#a7e48939924d26d58803de390e852a01c">FieldInvertState</a> = Lucene.Net.Index.FieldInvertState;</div> |
| <div class="line"><a name="l00021"></a><span class="lineno"> 21</span> </div> |
| <div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="keyword">namespace </span>Lucene.Net.Search</div> |
| <div class="line"><a name="l00023"></a><span class="lineno"> 23</span> {</div> |
| <div class="line"><a name="l00024"></a><span class="lineno"> 24</span>  </div> |
| <div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  [Serializable]</div> |
| <div class="line"><a name="l00027"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_search_1_1_default_similarity.html"> 27</a></span>  <span class="keyword">public</span> <span class="keyword">class </span><a class="code" href="class_lucene_1_1_net_1_1_search_1_1_default_similarity.html" title="Expert: Default scoring implementation. ">DefaultSimilarity</a>:<a class="code" href="class_lucene_1_1_net_1_1_search_1_1_similarity.html" title="Expert: Scoring API. Subclasses implement search scoring.">Similarity</a></div> |
| <div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  {</div> |
| <div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  </div> |
| <div class="line"><a name="l00040"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_search_1_1_default_similarity.html#ad14b290caf25c05dc441a35ddff28969"> 40</a></span>  <span class="keyword">public</span> <span class="keyword">override</span> <span class="keywordtype">float</span> ComputeNorm(System.String field, <a class="code" href="_fieldable_8cs.html#a7e48939924d26d58803de390e852a01c">FieldInvertState</a> state)</div> |
| <div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  {</div> |
| <div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  <span class="keywordtype">int</span> numTerms;</div> |
| <div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  <span class="keywordflow">if</span> (internalDiscountOverlaps)</div> |
| <div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  numTerms = state.Length - state.NumOverlap;</div> |
| <div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  <span class="keywordflow">else</span></div> |
| <div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  numTerms = state.Length;</div> |
| <div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  <span class="keywordflow">return</span> (state.Boost * LengthNorm(field, numTerms));</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>  </div> |
| <div class="line"><a name="l00051"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_search_1_1_default_similarity.html#abf30485ea3b8d9b662d2159b2be79fee"> 51</a></span>  <span class="keyword">public</span> <span class="keyword">override</span> <span class="keywordtype">float</span> LengthNorm(System.String fieldName, <span class="keywordtype">int</span> numTerms)</div> |
| <div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  {</div> |
| <div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <span class="keywordflow">return</span> (<span class="keywordtype">float</span>) (1.0 / System.Math.Sqrt(numTerms));</div> |
| <div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  }</div> |
| <div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  </div> |
| <div class="line"><a name="l00057"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_search_1_1_default_similarity.html#aac12c840f91004aa02461da448b42f2d"> 57</a></span>  <span class="keyword">public</span> <span class="keyword">override</span> <span class="keywordtype">float</span> QueryNorm(<span class="keywordtype">float</span> sumOfSquaredWeights)</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>  <span class="keywordflow">return</span> (<span class="keywordtype">float</span>) (1.0 / System.Math.Sqrt(sumOfSquaredWeights));</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>  </div> |
| <div class="line"><a name="l00063"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_search_1_1_default_similarity.html#a23cb836777a596d02d86de28e723e826"> 63</a></span>  <span class="keyword">public</span> <span class="keyword">override</span> <span class="keywordtype">float</span> Tf(<span class="keywordtype">float</span> freq)</div> |
| <div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  {</div> |
| <div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  <span class="keywordflow">return</span> (<span class="keywordtype">float</span>) System.Math.Sqrt(freq);</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>  </div> |
| <div class="line"><a name="l00069"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_search_1_1_default_similarity.html#a38309093c061fe7b92edab56091df6ca"> 69</a></span>  <span class="keyword">public</span> <span class="keyword">override</span> <span class="keywordtype">float</span> SloppyFreq(<span class="keywordtype">int</span> distance)</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>  <span class="keywordflow">return</span> 1.0f / (distance + 1);</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>  </div> |
| <div class="line"><a name="l00075"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_search_1_1_default_similarity.html#a373cb8d80a99d28e1cfc2a291fb0b8dc"> 75</a></span>  <span class="keyword">public</span> <span class="keyword">override</span> <span class="keywordtype">float</span> Idf(<span class="keywordtype">int</span> docFreq, <span class="keywordtype">int</span> numDocs)</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>  <span class="keywordflow">return</span> (<span class="keywordtype">float</span>) (System.Math.Log(numDocs / (<span class="keywordtype">double</span>) (docFreq + 1)) + 1.0);</div> |
| <div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  }</div> |
| <div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  </div> |
| <div class="line"><a name="l00081"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_search_1_1_default_similarity.html#a52b567fd4d51b9ed6ab0afe74f96efdc"> 81</a></span>  <span class="keyword">public</span> <span class="keyword">override</span> <span class="keywordtype">float</span> Coord(<span class="keywordtype">int</span> overlap, <span class="keywordtype">int</span> maxOverlap)</div> |
| <div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  {</div> |
| <div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  <span class="keywordflow">return</span> overlap / (float) maxOverlap;</div> |
| <div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  }</div> |
| <div class="line"><a name="l00085"></a><span class="lineno"> 85</span> </div> |
| <div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  <span class="comment">// Default false</span></div> |
| <div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  <span class="keyword">protected</span> <span class="keyword">internal</span> <span class="keywordtype">bool</span> internalDiscountOverlaps;</div> |
| <div class="line"><a name="l00090"></a><span class="lineno"> 90</span> </div> |
| <div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  <span class="keyword">public</span> <span class="keyword">virtual</span> <span class="keywordtype">bool</span> DiscountOverlaps</div> |
| <div class="line"><a name="l00103"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_search_1_1_default_similarity.html#a196fd2865faa2cd7c2ddf7e742cf7827"> 103</a></span>  {</div> |
| <div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  <span class="keyword">get</span> { <span class="keywordflow">return</span> internalDiscountOverlaps; }</div> |
| <div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  <span class="keyword">set</span> { internalDiscountOverlaps = value; }</div> |
| <div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  }</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> }</div> |
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