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| <a href="_top_docs_collector_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.Util;</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="l00030"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_search_1_1_top_docs_collector_3_01_t_01_4.html"> 30</a></span>  <span class="keyword">public</span> <span class="keyword">abstract</span> <span class="keyword">class </span>TopDocsCollector<T> : <a class="code" href="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> where T : <a class="code" href="class_lucene_1_1_net_1_1_search_1_1_score_doc.html" title="Expert: Returned by low-level search implementations.">ScoreDoc</a></div> |
| <div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  {</div> |
| <div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  </div> |
| <div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  <span class="comment">// This is used in case topDocs() is called with illegal parameters, or there</span></div> |
| <div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  <span class="comment">// simply aren't (enough) results.</span></div> |
| <div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  <span class="keyword">protected</span> <span class="keyword">internal</span> <span class="keyword">static</span> readonly <a class="code" href="class_lucene_1_1_net_1_1_search_1_1_top_docs.html" title="Represents hits returned by Searcher.Search(Query,Filter,int) and Searcher.Search(Query,int) ">TopDocs</a> EMPTY_TOPDOCS = <span class="keyword">new</span> <a class="code" href="class_lucene_1_1_net_1_1_search_1_1_top_docs.html" title="Represents hits returned by Searcher.Search(Query,Filter,int) and Searcher.Search(Query,int) ">TopDocs</a>(0, <span class="keyword">new</span> <a class="code" href="class_lucene_1_1_net_1_1_search_1_1_score_doc.html" title="Expert: Returned by low-level search implementations.">ScoreDoc</a>[0], System.Single.NaN);</div> |
| <div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  </div> |
| <div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  <span class="keyword">protected</span> <span class="keyword">internal</span> <a class="code" href="class_lucene_1_1_net_1_1_util_1_1_priority_queue_3_01_t_01_4.html" title="A PriorityQueue maintains a partial ordering of its elements such that the least element can always b...">PriorityQueue<T></a> pq;</div> |
| <div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  </div> |
| <div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  <span class="keyword">protected</span> <span class="keyword">internal</span> <span class="keywordtype">int</span> internalTotalHits;</div> |
| <div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  </div> |
| <div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  <span class="keyword">protected</span> <span class="keyword">internal</span> TopDocsCollector(<a class="code" href="class_lucene_1_1_net_1_1_util_1_1_priority_queue_3_01_t_01_4.html" title="A PriorityQueue maintains a partial ordering of its elements such that the least element can always b...">PriorityQueue<T></a> pq)</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>  this.pq = pq;</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="l00055"></a><span class="lineno"> 55</span>  <span class="keyword">protected</span> <span class="keyword">internal</span> <span class="keyword">virtual</span> <span class="keywordtype">void</span> PopulateResults(<a class="code" href="class_lucene_1_1_net_1_1_search_1_1_score_doc.html" title="Expert: Returned by low-level search implementations.">ScoreDoc</a>[] results, <span class="keywordtype">int</span> howMany)</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>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = howMany - 1; i >= 0; i--)</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>  results[i] = pq.<a class="code" href="class_lucene_1_1_net_1_1_util_1_1_priority_queue_3_01_t_01_4.html#adf887603a88dab648d510e7e786d5423" title="Removes and returns the least element of the PriorityQueue in log(size) time. ">Pop</a>();</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="l00062"></a><span class="lineno"> 62</span> </div> |
| <div class="line"><a name="l00068"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_search_1_1_top_docs_collector_3_01_t_01_4.html#a04dc2431625ba573591266d4fd2201dc"> 68</a></span>  <span class="keyword">public</span> <span class="comment">/*protected internal*/</span> <span class="keyword">virtual</span> <a class="code" href="class_lucene_1_1_net_1_1_search_1_1_top_docs.html" title="Represents hits returned by Searcher.Search(Query,Filter,int) and Searcher.Search(Query,int) ">TopDocs</a> NewTopDocs(<a class="code" href="class_lucene_1_1_net_1_1_search_1_1_score_doc.html" title="Expert: Returned by low-level search implementations.">ScoreDoc</a>[] results, <span class="keywordtype">int</span> start)</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="keywordflow">return</span> results == null?EMPTY_TOPDOCS:<span class="keyword">new</span> <a class="code" href="class_lucene_1_1_net_1_1_search_1_1_top_docs.html" title="Represents hits returned by Searcher.Search(Query,Filter,int) and Searcher.Search(Query,int) ">TopDocs</a>(internalTotalHits, results);</div> |
| <div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  }</div> |
| <div class="line"><a name="l00072"></a><span class="lineno"> 72</span> </div> |
| <div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  <span class="keyword">public</span> <span class="keyword">virtual</span> <span class="keywordtype">int</span> TotalHits</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_top_docs_collector_3_01_t_01_4.html#aeff22c23faf95d863bff65fffb40a42e"> 75</a></span>  {</div> |
| <div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  <span class="keyword">get</span> { <span class="keywordflow">return</span> internalTotalHits; }</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> </div> |
| <div class="line"><a name="l00080"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_search_1_1_top_docs_collector_3_01_t_01_4.html#a67468e88f7e0253433b7a5f30b2e303a"> 80</a></span>  <span class="keyword">public</span> <a class="code" href="class_lucene_1_1_net_1_1_search_1_1_top_docs.html" title="Represents hits returned by Searcher.Search(Query,Filter,int) and Searcher.Search(Query,int) ">TopDocs</a> <a class="code" href="class_lucene_1_1_net_1_1_search_1_1_top_docs.html" title="Represents hits returned by Searcher.Search(Query,Filter,int) and Searcher.Search(Query,int) ">TopDocs</a>()</div> |
| <div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  {</div> |
| <div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  <span class="comment">// In case pq was populated with sentinel values, there might be less</span></div> |
| <div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  <span class="comment">// results than pq.size(). Therefore return all results until either</span></div> |
| <div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  <span class="comment">// pq.size() or totalHits.</span></div> |
| <div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  <span class="keywordflow">return</span> <a class="code" href="class_lucene_1_1_net_1_1_search_1_1_top_docs.html" title="Represents hits returned by Searcher.Search(Query,Filter,int) and Searcher.Search(Query,int) ">TopDocs</a>(0, internalTotalHits < pq.<a class="code" href="class_lucene_1_1_net_1_1_util_1_1_priority_queue_3_01_t_01_4.html#adce7118eba5559440cd7f26f686836d2" title="Returns the number of elements currently stored in the PriorityQueue. ">Size</a>()?internalTotalHits:pq.<a class="code" href="class_lucene_1_1_net_1_1_util_1_1_priority_queue_3_01_t_01_4.html#adce7118eba5559440cd7f26f686836d2" title="Returns the number of elements currently stored in the PriorityQueue. ">Size</a>());</div> |
| <div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  }</div> |
| <div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  </div> |
| <div class="line"><a name="l00099"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_search_1_1_top_docs_collector_3_01_t_01_4.html#a85bacdd762dbf34ea8d7e02865169531"> 99</a></span>  <span class="keyword">public</span> <a class="code" href="class_lucene_1_1_net_1_1_search_1_1_top_docs.html" title="Represents hits returned by Searcher.Search(Query,Filter,int) and Searcher.Search(Query,int) ">TopDocs</a> <a class="code" href="class_lucene_1_1_net_1_1_search_1_1_top_docs.html" title="Represents hits returned by Searcher.Search(Query,Filter,int) and Searcher.Search(Query,int) ">TopDocs</a>(<span class="keywordtype">int</span> start)</div> |
| <div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  {</div> |
| <div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  <span class="comment">// In case pq was populated with sentinel values, there might be less</span></div> |
| <div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  <span class="comment">// results than pq.size(). Therefore return all results until either</span></div> |
| <div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  <span class="comment">// pq.size() or totalHits.</span></div> |
| <div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  <span class="keywordflow">return</span> <a class="code" href="class_lucene_1_1_net_1_1_search_1_1_top_docs.html" title="Represents hits returned by Searcher.Search(Query,Filter,int) and Searcher.Search(Query,int) ">TopDocs</a>(start, internalTotalHits < pq.<a class="code" href="class_lucene_1_1_net_1_1_util_1_1_priority_queue_3_01_t_01_4.html#adce7118eba5559440cd7f26f686836d2" title="Returns the number of elements currently stored in the PriorityQueue. ">Size</a>()?internalTotalHits:pq.<a class="code" href="class_lucene_1_1_net_1_1_util_1_1_priority_queue_3_01_t_01_4.html#adce7118eba5559440cd7f26f686836d2" title="Returns the number of elements currently stored in the PriorityQueue. ">Size</a>());</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> |
| <div class="line"><a name="l00120"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_search_1_1_top_docs_collector_3_01_t_01_4.html#a5b01f25cd19aad8a9216677f68a92674"> 120</a></span>  <span class="keyword">public</span> <a class="code" href="class_lucene_1_1_net_1_1_search_1_1_top_docs.html" title="Represents hits returned by Searcher.Search(Query,Filter,int) and Searcher.Search(Query,int) ">TopDocs</a> <a class="code" href="class_lucene_1_1_net_1_1_search_1_1_top_docs.html" title="Represents hits returned by Searcher.Search(Query,Filter,int) and Searcher.Search(Query,int) ">TopDocs</a>(<span class="keywordtype">int</span> start, <span class="keywordtype">int</span> howMany)</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"> 123</span>  <span class="comment">// In case pq was populated with sentinel values, there might be less</span></div> |
| <div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  <span class="comment">// results than pq.size(). Therefore return all results until either</span></div> |
| <div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  <span class="comment">// pq.size() or totalHits.</span></div> |
| <div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  <span class="keywordtype">int</span> size = internalTotalHits < pq.<a class="code" href="class_lucene_1_1_net_1_1_util_1_1_priority_queue_3_01_t_01_4.html#adce7118eba5559440cd7f26f686836d2" title="Returns the number of elements currently stored in the PriorityQueue. ">Size</a>()?internalTotalHits:pq.<a class="code" href="class_lucene_1_1_net_1_1_util_1_1_priority_queue_3_01_t_01_4.html#adce7118eba5559440cd7f26f686836d2" title="Returns the number of elements currently stored in the PriorityQueue. ">Size</a>();</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>  <span class="comment">// Don't bother to throw an exception, just return an empty TopDocs in case</span></div> |
| <div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  <span class="comment">// the parameters are invalid or out of range.</span></div> |
| <div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  <span class="keywordflow">if</span> (start < 0 || start >= size || howMany <= 0)</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>  <span class="keywordflow">return</span> NewTopDocs(null, start);</div> |
| <div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  }</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">// We know that start < pqsize, so just fix howMany. </span></div> |
| <div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  howMany = System.Math.Min(size - start, howMany);</div> |
| <div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  <a class="code" href="class_lucene_1_1_net_1_1_search_1_1_score_doc.html" title="Expert: Returned by low-level search implementations.">ScoreDoc</a>[] results = <span class="keyword">new</span> <a class="code" href="class_lucene_1_1_net_1_1_search_1_1_score_doc.html" title="Expert: Returned by low-level search implementations.">ScoreDoc</a>[howMany];</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="comment">// pq's pop() returns the 'least' element in the queue, therefore need</span></div> |
| <div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  <span class="comment">// to discard the first ones, until we reach the requested range.</span></div> |
| <div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  <span class="comment">// Note that this loop will usually not be executed, since the common usage</span></div> |
| <div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  <span class="comment">// should be that the caller asks for the last howMany results. However it's</span></div> |
| <div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  <span class="comment">// needed here for completeness.</span></div> |
| <div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = pq.<a class="code" href="class_lucene_1_1_net_1_1_util_1_1_priority_queue_3_01_t_01_4.html#adce7118eba5559440cd7f26f686836d2" title="Returns the number of elements currently stored in the PriorityQueue. ">Size</a>() - start - howMany; i > 0; i--)</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>  pq.<a class="code" href="class_lucene_1_1_net_1_1_util_1_1_priority_queue_3_01_t_01_4.html#adf887603a88dab648d510e7e786d5423" title="Removes and returns the least element of the PriorityQueue in log(size) time. ">Pop</a>();</div> |
| <div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  }</div> |
| <div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  </div> |
| <div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  <span class="comment">// Get the requested results from pq.</span></div> |
| <div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  PopulateResults(results, howMany);</div> |
| <div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  </div> |
| <div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  <span class="keywordflow">return</span> NewTopDocs(results, start);</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>  }</div> |
| <div class="line"><a name="l00155"></a><span class="lineno"> 155</span> }</div> |
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