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| <a href="_conjunction_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> System.Linq;</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>  </div> |
| <div class="line"><a name="l00025"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_search_1_1_conjunction_scorer.html"> 25</a></span>  <span class="keyword">class </span><a class="code" href="class_lucene_1_1_net_1_1_search_1_1_conjunction_scorer.html" title="Scorer for conjunctions, sets of queries, all of which are required. ">ConjunctionScorer</a>:<a class="code" href="class_lucene_1_1_net_1_1_search_1_1_scorer.html" title="Expert: Common scoring functionality for different types of queries.">Scorer</a></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>  <span class="keyword">private</span> <a class="code" href="class_lucene_1_1_net_1_1_search_1_1_scorer.html" title="Expert: Common scoring functionality for different types of queries.">Scorer</a>[] scorers;</div> |
| <div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  <span class="keyword">private</span> <span class="keywordtype">float</span> coord;</div> |
| <div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  <span class="keyword">private</span> <span class="keywordtype">int</span> lastDoc = - 1;</div> |
| <div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  </div> |
| <div class="line"><a name="l00031"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_search_1_1_conjunction_scorer.html#a8df3818a883c4204b6f7ed08b58bd1d4"> 31</a></span>  <span class="keyword">public</span> <a class="code" href="class_lucene_1_1_net_1_1_search_1_1_conjunction_scorer.html" title="Scorer for conjunctions, sets of queries, all of which are required. ">ConjunctionScorer</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> similarity, System.Collections.Generic.ICollection<<a class="code" href="class_lucene_1_1_net_1_1_search_1_1_scorer.html" title="Expert: Common scoring functionality for different types of queries.">Scorer</a>> scorers)</div> |
| <div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  : this(similarity, scorers.ToArray())</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="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_search_1_1_conjunction_scorer.html#ae345bd1858f834eed969e41f337ab5e4"> 36</a></span>  <span class="keyword">public</span> <a class="code" href="class_lucene_1_1_net_1_1_search_1_1_conjunction_scorer.html" title="Scorer for conjunctions, sets of queries, all of which are required. ">ConjunctionScorer</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> similarity, params <a class="code" href="class_lucene_1_1_net_1_1_search_1_1_scorer.html" title="Expert: Common scoring functionality for different types of queries.">Scorer</a>[] scorers):base(similarity)</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>  this.scorers = scorers;</div> |
| <div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  coord = similarity.<a class="code" href="class_lucene_1_1_net_1_1_search_1_1_similarity.html#acef90f6b9b05e7f0d63e145987229e85" title="Computes a score factor based on the fraction of all query terms that a document contains. This value is multiplied into scores.">Coord</a>(scorers.Length, scorers.Length);</div> |
| <div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  </div> |
| <div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < scorers.Length; i++)</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="keywordflow">if</span> (scorers[i].NextDoc() == NO_MORE_DOCS)</div> |
| <div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  {</div> |
| <div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  <span class="comment">// If even one of the sub-scorers does not have any documents, this</span></div> |
| <div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  <span class="comment">// scorer should not attempt to do any more work.</span></div> |
| <div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  lastDoc = NO_MORE_DOCS;</div> |
| <div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  return ;</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>  }</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">// Sort the array the first time...</span></div> |
| <div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <span class="comment">// We don't need to sort the array in any future calls because we know</span></div> |
| <div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  <span class="comment">// it will already start off sorted (all scorers on same doc).</span></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>  <span class="comment">// note that this comparator is not consistent with equals!</span></div> |
| <div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  System.Array.Sort(scorers, (a, b) => a.DocID() - b.DocID());</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="comment">// NOTE: doNext() must be called before the re-sorting of the array later on.</span></div> |
| <div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  <span class="comment">// The reason is this: assume there are 5 scorers, whose first docs are 1,</span></div> |
| <div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  <span class="comment">// 2, 3, 5, 5 respectively. Sorting (above) leaves the array as is. Calling</span></div> |
| <div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  <span class="comment">// doNext() here advances all the first scorers to 5 (or a larger doc ID</span></div> |
| <div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  <span class="comment">// they all agree on). </span></div> |
| <div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  <span class="comment">// However, if we re-sort before doNext() is called, the order will be 5, 3,</span></div> |
| <div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  <span class="comment">// 2, 1, 5 and then doNext() will stop immediately, since the first scorer's</span></div> |
| <div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  <span class="comment">// docs equals the last one. So the invariant that after calling doNext() </span></div> |
| <div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  <span class="comment">// all scorers are on the same doc ID is broken.);</span></div> |
| <div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  <span class="keywordflow">if</span> (DoNext() == NO_MORE_DOCS)</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>  <span class="comment">// The scorers did not agree on any document.</span></div> |
| <div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  lastDoc = NO_MORE_DOCS;</div> |
| <div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  return ;</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="l00075"></a><span class="lineno"> 75</span>  <span class="comment">// If first-time skip distance is any predictor of</span></div> |
| <div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  <span class="comment">// scorer sparseness, then we should always try to skip first on</span></div> |
| <div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  <span class="comment">// those scorers.</span></div> |
| <div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  <span class="comment">// Keep last scorer in it's last place (it will be the first</span></div> |
| <div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  <span class="comment">// to be skipped on), but reverse all of the others so that</span></div> |
| <div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  <span class="comment">// they will be skipped on in order of original high skip.</span></div> |
| <div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  <span class="keywordtype">int</span> end = scorers.Length - 1;</div> |
| <div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  <span class="keywordtype">int</span> max = end >> 1;</div> |
| <div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < max; i++)</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>  <a class="code" href="class_lucene_1_1_net_1_1_search_1_1_scorer.html" title="Expert: Common scoring functionality for different types of queries.">Scorer</a> tmp = scorers[i];</div> |
| <div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  <span class="keywordtype">int</span> idx = end - i - 1;</div> |
| <div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  scorers[i] = scorers[idx];</div> |
| <div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  scorers[idx] = tmp;</div> |
| <div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  }</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>  </div> |
| <div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  <span class="keyword">private</span> <span class="keywordtype">int</span> DoNext()</div> |
| <div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  {</div> |
| <div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  <span class="keywordtype">int</span> first = 0;</div> |
| <div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  <span class="keywordtype">int</span> doc = scorers[scorers.Length - 1].<a class="code" href="class_lucene_1_1_net_1_1_search_1_1_doc_id_set_iterator.html#a617cbe6c07c261cc2cc86ad3d255152f" title="Returns the following: -1 or NO_MORE_DOCS if NextDoc() or Advance(int) were not called yet...">DocID</a>();</div> |
| <div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  <a class="code" href="class_lucene_1_1_net_1_1_search_1_1_scorer.html" title="Expert: Common scoring functionality for different types of queries.">Scorer</a> firstScorer;</div> |
| <div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  <span class="keywordflow">while</span> ((firstScorer = scorers[first]).DocID() < doc)</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>  doc = firstScorer.<a class="code" href="class_lucene_1_1_net_1_1_search_1_1_doc_id_set_iterator.html#a4ea4804a0dd948a55077e1dde86b0983" title="Advances to the first beyond the current whose document number is greater than or equal to target...">Advance</a>(doc);</div> |
| <div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  first = first == scorers.Length - 1?0:first + 1;</div> |
| <div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  }</div> |
| <div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  <span class="keywordflow">return</span> doc;</div> |
| <div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  }</div> |
| <div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  </div> |
| <div class="line"><a name="l00105"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_search_1_1_conjunction_scorer.html#ac235260a8ae1b1988d7ee29070f3408e"> 105</a></span>  <span class="keyword">public</span> <span class="keyword">override</span> <span class="keywordtype">int</span> Advance(<span class="keywordtype">int</span> target)</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>  <span class="keywordflow">if</span> (lastDoc == NO_MORE_DOCS)</div> |
| <div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  {</div> |
| <div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  <span class="keywordflow">return</span> lastDoc;</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="keywordflow">else</span> <span class="keywordflow">if</span> (scorers[(scorers.Length - 1)].DocID() < target)</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>  scorers[(scorers.Length - 1)].Advance(target);</div> |
| <div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  }</div> |
| <div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  <span class="keywordflow">return</span> lastDoc = DoNext();</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_search_1_1_conjunction_scorer.html#a98fd8d41141bd82f994dc0848057e388"> 118</a></span>  <span class="keyword">public</span> <span class="keyword">override</span> <span class="keywordtype">int</span> DocID()</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>  <span class="keywordflow">return</span> lastDoc;</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>  </div> |
| <div class="line"><a name="l00123"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_search_1_1_conjunction_scorer.html#acbdae9b18487c8b844cf865a2a4c74f9"> 123</a></span>  <span class="keyword">public</span> <span class="keyword">override</span> <span class="keywordtype">int</span> NextDoc()</div> |
| <div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  {</div> |
| <div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  <span class="keywordflow">if</span> (lastDoc == NO_MORE_DOCS)</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">return</span> lastDoc;</div> |
| <div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  }</div> |
| <div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  <span class="keywordflow">else</span> <span class="keywordflow">if</span> (lastDoc == - 1)</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="keywordflow">return</span> lastDoc = scorers[scorers.Length - 1].DocID();</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>  scorers[(scorers.Length - 1)].NextDoc();</div> |
| <div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  <span class="keywordflow">return</span> lastDoc = DoNext();</div> |
| <div class="line"><a name="l00135"></a><span class="lineno"> 135</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"><a class="code" href="class_lucene_1_1_net_1_1_search_1_1_conjunction_scorer.html#ab97c3b19832cd35fe222ecb4afd8aa5d"> 137</a></span>  <span class="keyword">public</span> <span class="keyword">override</span> <span class="keywordtype">float</span> Score()</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>  <span class="keywordtype">float</span> sum = 0.0f;</div> |
| <div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < scorers.Length; i++)</div> |
| <div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  {</div> |
| <div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  sum += scorers[i].Score();</div> |
| <div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  }</div> |
| <div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  <span class="keywordflow">return</span> sum * coord;</div> |
| <div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  }</div> |
| <div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  }</div> |
| <div class="line"><a name="l00147"></a><span class="lineno"> 147</span> }</div> |
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