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|  <span id="projectnumber">3.0.3</span> |
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| <div class="title">Scorer.cs</div> </div> |
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| <a href="../../d4/d27/_scorer_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> Lucene.Net.Index;</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.Search</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>  <span class="comment"></span></div> |
| <div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="comment"> /// <summary> Expert: Common scoring functionality for different types of queries.</span></div> |
| <div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="comment"> /// </span></div> |
| <div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="comment"> /// <p/></span></div> |
| <div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="comment"> /// A <c>Scorer</c> iterates over documents matching a</span></div> |
| <div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="comment"> /// query in increasing order of doc Id.</span></div> |
| <div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="comment"> /// <p/></span></div> |
| <div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="comment"> /// <p/></span></div> |
| <div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="comment"> /// Document scores are computed using a given <c>Similarity</c></span></div> |
| <div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="comment"> /// implementation.</span></div> |
| <div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="comment"> /// <p/></span></div> |
| <div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="comment"> /// </span></div> |
| <div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="comment"> /// <p/><b>NOTE</b>: The values Float.Nan,</span></div> |
| <div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="comment"> /// Float.NEGATIVE_INFINITY and Float.POSITIVE_INFINITY are</span></div> |
| <div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="comment"> /// not valid scores. Certain collectors (eg <see cref="TopScoreDocCollector" /></span></div> |
| <div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="comment"> ///) will not properly collect hits</span></div> |
| <div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="comment"> /// with these scores.</span></div> |
| <div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="comment"> /// </summary></span></div> |
| <div class="line"><a name="l00041"></a><span class="lineno"><a class="code" href="../../d8/d74/class_lucene_1_1_net_1_1_search_1_1_scorer.html"> 41</a></span> <span class="comment"></span> <span class="keyword">public</span> <span class="keyword">abstract</span> <span class="keyword">class </span><a class="code" href="../../d8/d74/class_lucene_1_1_net_1_1_search_1_1_scorer.html" title="Expert: Common scoring functionality for different types of queries.">Scorer</a>:<a class="code" href="../../d3/de1/class_lucene_1_1_net_1_1_search_1_1_doc_id_set_iterator.html" title="This abstract class defines methods to iterate over a set of non-decreasing doc ids. Note that this class assumes it iterates on doc Ids, and therefore NO_MORE_DOCS is set to Int32.MaxValue in order to be used as a sentinel object. Implementations of this class are expected to consider int.MaxValue as an invalid value. ">DocIdSetIterator</a></div> |
| <div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  {</div> |
| <div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  <span class="keyword">private</span> <a class="code" href="../../df/dc2/class_lucene_1_1_net_1_1_search_1_1_similarity.html" title="Expert: Scoring API. Subclasses implement search scoring.">Similarity</a> similarity;</div> |
| <div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  <span class="comment"></span></div> |
| <div class="line"><a name="l00045"></a><span class="lineno"> 45</span> <span class="comment"> /// <summary>Constructs a Scorer.</summary></span></div> |
| <div class="line"><a name="l00046"></a><span class="lineno"> 46</span> <span class="comment"> /// <param name="similarity">The <c>Similarity</c> implementation used by this scorer.</span></div> |
| <div class="line"><a name="l00047"></a><span class="lineno"> 47</span> <span class="comment"> /// </param></span></div> |
| <div class="line"><a name="l00048"></a><span class="lineno"> 48</span> <span class="comment"></span> <span class="keyword">protected</span> <span class="keyword">internal</span> <a class="code" href="../../d7/d70/_documents_writer_8cs.html#a83f1a9bf052559c9fc4b5dc2c3d490f1">Scorer</a>(<a class="code" href="../../df/dc2/class_lucene_1_1_net_1_1_search_1_1_similarity.html" title="Expert: Scoring API. Subclasses implement search scoring.">Similarity</a> similarity)</div> |
| <div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  {</div> |
| <div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  this.similarity = similarity;</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> <span class="comment"></span></div> |
| <div class="line"><a name="l00053"></a><span class="lineno"> 53</span> <span class="comment"> /// <summary>Returns the Similarity implementation used by this scorer. </summary></span></div> |
| <div class="line"><a name="l00054"></a><span class="lineno"> 54</span> <span class="comment"></span> <span class="keyword">public</span> <span class="keyword">virtual</span> <a class="code" href="../../df/dc2/class_lucene_1_1_net_1_1_search_1_1_similarity.html" title="Expert: Scoring API. Subclasses implement search scoring.">Similarity</a> <a class="code" href="../../df/dc2/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="l00055"></a><span class="lineno"><a class="code" href="../../d8/d74/class_lucene_1_1_net_1_1_search_1_1_scorer.html#aa2d07dddba4ce149cbd46abbfc139d8a"> 55</a></span>  {</div> |
| <div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  <span class="keyword">get</span> { <span class="keywordflow">return</span> this.similarity; }</div> |
| <div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  }</div> |
| <div class="line"><a name="l00058"></a><span class="lineno"> 58</span> <span class="comment"></span></div> |
| <div class="line"><a name="l00059"></a><span class="lineno"> 59</span> <span class="comment"> /// <summary>Scores and collects all matching documents.</summary></span></div> |
| <div class="line"><a name="l00060"></a><span class="lineno"> 60</span> <span class="comment"> /// <param name="collector">The collector to which all matching documents are passed.</span></div> |
| <div class="line"><a name="l00061"></a><span class="lineno"> 61</span> <span class="comment"> /// </param></span></div> |
| <div class="line"><a name="l00062"></a><span class="lineno"><a class="code" href="../../d8/d74/class_lucene_1_1_net_1_1_search_1_1_scorer.html#a23e72c598a4e46bd528ed19b272fc687"> 62</a></span> <span class="comment"></span> <span class="keyword">public</span> <span class="keyword">virtual</span> <span class="keywordtype">void</span> Score(<a class="code" href="../../d4/d93/class_lucene_1_1_net_1_1_search_1_1_collector.html" title="Expert: Collectors are primarily meant to be used to gather raw results from a search, and implement sorting or custom result filtering, collation, etc. ">Collector</a> collector)</div> |
| <div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  {</div> |
| <div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  collector.<a class="code" href="../../d4/d93/class_lucene_1_1_net_1_1_search_1_1_collector.html#aa8d9d434cf08dd3422210a7c00ec9e80" title="Called before successive calls to Collect(int). Implementations that need the score of the current do...">SetScorer</a>(<span class="keyword">this</span>);</div> |
| <div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  <span class="keywordtype">int</span> doc;</div> |
| <div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  <span class="keywordflow">while</span> ((doc = NextDoc()) != NO_MORE_DOCS)</div> |
| <div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  {</div> |
| <div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  collector.<a class="code" href="../../d4/d93/class_lucene_1_1_net_1_1_search_1_1_collector.html#a125e477dc1b59bbdb22fa71eeac4fd8b" title="Called once for every document matching a query, with the unbased document number.">Collect</a>(doc);</div> |
| <div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  }</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="comment"></span></div> |
| <div class="line"><a name="l00072"></a><span class="lineno"> 72</span> <span class="comment"> /// <summary> Expert: Collects matching documents in a range. Hook for optimization.</span></div> |
| <div class="line"><a name="l00073"></a><span class="lineno"> 73</span> <span class="comment"> /// Note, <paramref name="firstDocID" /> is added to ensure that <see cref="DocIdSetIterator.NextDoc()" /></span></div> |
| <div class="line"><a name="l00074"></a><span class="lineno"> 74</span> <span class="comment"> /// was called before this method.</span></div> |
| <div class="line"><a name="l00075"></a><span class="lineno"> 75</span> <span class="comment"> /// </span></div> |
| <div class="line"><a name="l00076"></a><span class="lineno"> 76</span> <span class="comment"> /// </summary></span></div> |
| <div class="line"><a name="l00077"></a><span class="lineno"> 77</span> <span class="comment"> /// <param name="collector">The collector to which all matching documents are passed.</span></div> |
| <div class="line"><a name="l00078"></a><span class="lineno"> 78</span> <span class="comment"> /// </param></span></div> |
| <div class="line"><a name="l00079"></a><span class="lineno"> 79</span> <span class="comment"> /// <param name="max">Do not score documents past this.</span></div> |
| <div class="line"><a name="l00080"></a><span class="lineno"> 80</span> <span class="comment"> /// </param></span></div> |
| <div class="line"><a name="l00081"></a><span class="lineno"> 81</span> <span class="comment"> /// <param name="firstDocID"></span></div> |
| <div class="line"><a name="l00082"></a><span class="lineno"> 82</span> <span class="comment"> /// The first document ID (ensures <see cref="DocIdSetIterator.NextDoc()" /> is called before</span></div> |
| <div class="line"><a name="l00083"></a><span class="lineno"> 83</span> <span class="comment"> /// this method.</span></div> |
| <div class="line"><a name="l00084"></a><span class="lineno"> 84</span> <span class="comment"> /// </param></span></div> |
| <div class="line"><a name="l00085"></a><span class="lineno"> 85</span> <span class="comment"> /// <returns> true if more matching documents may remain.</span></div> |
| <div class="line"><a name="l00086"></a><span class="lineno"> 86</span> <span class="comment"> /// </returns></span></div> |
| <div class="line"><a name="l00087"></a><span class="lineno"><a class="code" href="../../d8/d74/class_lucene_1_1_net_1_1_search_1_1_scorer.html#afbae24b7b3053a0e489fc8f18664f6a9"> 87</a></span> <span class="comment"></span> <span class="keyword">public</span> <span class="comment">/*protected internal*/</span> <span class="keyword">virtual</span> <span class="keywordtype">bool</span> Score(<a class="code" href="../../d4/d93/class_lucene_1_1_net_1_1_search_1_1_collector.html" title="Expert: Collectors are primarily meant to be used to gather raw results from a search, and implement sorting or custom result filtering, collation, etc. ">Collector</a> collector, <span class="keywordtype">int</span> max, <span class="keywordtype">int</span> firstDocID)</div> |
| <div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  {</div> |
| <div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  collector.<a class="code" href="../../d4/d93/class_lucene_1_1_net_1_1_search_1_1_collector.html#aa8d9d434cf08dd3422210a7c00ec9e80" title="Called before successive calls to Collect(int). Implementations that need the score of the current do...">SetScorer</a>(<span class="keyword">this</span>);</div> |
| <div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  <span class="keywordtype">int</span> doc = firstDocID;</div> |
| <div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  <span class="keywordflow">while</span> (doc < max)</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>  collector.<a class="code" href="../../d4/d93/class_lucene_1_1_net_1_1_search_1_1_collector.html#a125e477dc1b59bbdb22fa71eeac4fd8b" title="Called once for every document matching a query, with the unbased document number.">Collect</a>(doc);</div> |
| <div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  doc = NextDoc();</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>  <span class="keywordflow">return</span> doc != NO_MORE_DOCS;</div> |
| <div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  }</div> |
| <div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  <span class="comment"></span></div> |
| <div class="line"><a name="l00099"></a><span class="lineno"> 99</span> <span class="comment"> /// <summary>Returns the score of the current document matching the query.</span></div> |
| <div class="line"><a name="l00100"></a><span class="lineno"> 100</span> <span class="comment"> /// Initially invalid, until <see cref="DocIdSetIterator.NextDoc()" /> or <see cref="DocIdSetIterator.Advance(int)" /></span></div> |
| <div class="line"><a name="l00101"></a><span class="lineno"> 101</span> <span class="comment"> /// is called the first time, or when called from within</span></div> |
| <div class="line"><a name="l00102"></a><span class="lineno"> 102</span> <span class="comment"> /// <see cref="Collector.Collect(int)" />.</span></div> |
| <div class="line"><a name="l00103"></a><span class="lineno"> 103</span> <span class="comment"> /// </summary></span></div> |
| <div class="line"><a name="l00104"></a><span class="lineno"> 104</span> <span class="comment"></span> <span class="keyword">public</span> <span class="keyword">abstract</span> <span class="keywordtype">float</span> Score();</div> |
| <div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  }</div> |
| <div class="line"><a name="l00106"></a><span class="lineno"> 106</span> }</div> |
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