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| <div class="title">DefaultSkipListWriter.cs</div> </div> |
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| <a href="_default_skip_list_writer_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_skip_list_writer_8cs.html#ade6c9dd9318ff9ca227f26d89b0ad2e5"> 20</a></span> <span class="keyword">using</span> <a class="code" href="_byte_slice_reader_8cs.html#ade6c9dd9318ff9ca227f26d89b0ad2e5">IndexOutput</a> = Lucene.Net.Store.IndexOutput;</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.Index</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="l00025"></a><span class="lineno"> 25</span>  </div> |
| <div class="line"><a name="l00030"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_index_1_1_default_skip_list_writer.html"> 30</a></span>  <span class="keyword">class </span><a class="code" href="class_lucene_1_1_net_1_1_index_1_1_default_skip_list_writer.html" title="Implements the skip list writer for the default posting list format that stores positions and payload...">DefaultSkipListWriter</a>:<a class="code" href="class_lucene_1_1_net_1_1_index_1_1_multi_level_skip_list_writer.html" title="This abstract class writes skip lists with multiple levels.">MultiLevelSkipListWriter</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>  <span class="keyword">private</span> <span class="keywordtype">int</span>[] lastSkipDoc;</div> |
| <div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  <span class="keyword">private</span> <span class="keywordtype">int</span>[] lastSkipPayloadLength;</div> |
| <div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  <span class="keyword">private</span> <span class="keywordtype">long</span>[] lastSkipFreqPointer;</div> |
| <div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  <span class="keyword">private</span> <span class="keywordtype">long</span>[] lastSkipProxPointer;</div> |
| <div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  </div> |
| <div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  <span class="keyword">private</span> <a class="code" href="_byte_slice_reader_8cs.html#ade6c9dd9318ff9ca227f26d89b0ad2e5">IndexOutput</a> freqOutput;</div> |
| <div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  <span class="keyword">private</span> <a class="code" href="_byte_slice_reader_8cs.html#ade6c9dd9318ff9ca227f26d89b0ad2e5">IndexOutput</a> proxOutput;</div> |
| <div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  </div> |
| <div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  <span class="keyword">private</span> <span class="keywordtype">int</span> curDoc;</div> |
| <div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  <span class="keyword">private</span> <span class="keywordtype">bool</span> curStorePayloads;</div> |
| <div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  <span class="keyword">private</span> <span class="keywordtype">int</span> curPayloadLength;</div> |
| <div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  <span class="keyword">private</span> <span class="keywordtype">long</span> curFreqPointer;</div> |
| <div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  <span class="keyword">private</span> <span class="keywordtype">long</span> curProxPointer;</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>  <span class="keyword">internal</span> <a class="code" href="class_lucene_1_1_net_1_1_index_1_1_default_skip_list_writer.html" title="Implements the skip list writer for the default posting list format that stores positions and payload...">DefaultSkipListWriter</a>(<span class="keywordtype">int</span> skipInterval, <span class="keywordtype">int</span> numberOfSkipLevels, <span class="keywordtype">int</span> docCount, <a class="code" href="_byte_slice_reader_8cs.html#ade6c9dd9318ff9ca227f26d89b0ad2e5">IndexOutput</a> freqOutput, <a class="code" href="_byte_slice_reader_8cs.html#ade6c9dd9318ff9ca227f26d89b0ad2e5">IndexOutput</a> proxOutput):base(skipInterval, numberOfSkipLevels, docCount)</div> |
| <div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  {</div> |
| <div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  this.freqOutput = freqOutput;</div> |
| <div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  this.proxOutput = proxOutput;</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>  lastSkipDoc = <span class="keyword">new</span> <span class="keywordtype">int</span>[numberOfSkipLevels];</div> |
| <div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  lastSkipPayloadLength = <span class="keyword">new</span> <span class="keywordtype">int</span>[numberOfSkipLevels];</div> |
| <div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  lastSkipFreqPointer = <span class="keyword">new</span> <span class="keywordtype">long</span>[numberOfSkipLevels];</div> |
| <div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  lastSkipProxPointer = <span class="keyword">new</span> <span class="keywordtype">long</span>[numberOfSkipLevels];</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>  </div> |
| <div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  <span class="keyword">internal</span> <span class="keyword">virtual</span> <span class="keywordtype">void</span> SetFreqOutput(<a class="code" href="_byte_slice_reader_8cs.html#ade6c9dd9318ff9ca227f26d89b0ad2e5">IndexOutput</a> freqOutput)</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>  this.freqOutput = freqOutput;</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>  <span class="keyword">internal</span> <span class="keyword">virtual</span> <span class="keywordtype">void</span> SetProxOutput(<a class="code" href="_byte_slice_reader_8cs.html#ade6c9dd9318ff9ca227f26d89b0ad2e5">IndexOutput</a> proxOutput)</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>  this.proxOutput = proxOutput;</div> |
| <div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  }</div> |
| <div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  </div> |
| <div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  <span class="keyword">internal</span> <span class="keyword">virtual</span> <span class="keywordtype">void</span> SetSkipData(<span class="keywordtype">int</span> doc, <span class="keywordtype">bool</span> storePayloads, <span class="keywordtype">int</span> payloadLength)</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>  this.curDoc = doc;</div> |
| <div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  this.curStorePayloads = storePayloads;</div> |
| <div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  this.curPayloadLength = payloadLength;</div> |
| <div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  this.curFreqPointer = freqOutput.FilePointer;</div> |
| <div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  <span class="keywordflow">if</span> (proxOutput != null)</div> |
| <div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  this.curProxPointer = proxOutput.FilePointer;</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="keyword">protected</span> <span class="keyword">internal</span> <span class="keyword">override</span> <span class="keywordtype">void</span> ResetSkip()</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>  base.ResetSkip();</div> |
| <div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < lastSkipDoc.Length; i++) lastSkipDoc[i] = 0;</div> |
| <div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < lastSkipPayloadLength.Length; i++) lastSkipPayloadLength[i] = -1; <span class="comment">// we don't have to write the first length in the skip list</span></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 < lastSkipFreqPointer.Length; i++) lastSkipFreqPointer[i] = freqOutput.FilePointer;</div> |
| <div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  if (proxOutput != null)</div> |
| <div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < lastSkipProxPointer.Length; i++) lastSkipProxPointer[i] = proxOutput.FilePointer;</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="l00088"></a><span class="lineno"> 88</span>  <span class="keyword">protected</span> <span class="keyword">internal</span> <span class="keyword">override</span> <span class="keywordtype">void</span> WriteSkipData(<span class="keywordtype">int</span> level, <a class="code" href="_byte_slice_reader_8cs.html#ade6c9dd9318ff9ca227f26d89b0ad2e5">IndexOutput</a> skipBuffer)</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>  <span class="comment">// To efficiently store payloads in the posting lists we do not store the length of</span></div> |
| <div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  <span class="comment">// every payload. Instead we omit the length for a payload if the previous payload had</span></div> |
| <div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  <span class="comment">// the same length.</span></div> |
| <div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  <span class="comment">// However, in order to support skipping the payload length at every skip point must be known.</span></div> |
| <div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  <span class="comment">// So we use the same length encoding that we use for the posting lists for the skip data as well:</span></div> |
| <div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  <span class="comment">// Case 1: current field does not store payloads</span></div> |
| <div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  <span class="comment">// SkipDatum --> DocSkip, FreqSkip, ProxSkip</span></div> |
| <div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  <span class="comment">// DocSkip,FreqSkip,ProxSkip --> VInt</span></div> |
| <div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  <span class="comment">// DocSkip records the document number before every SkipInterval th document in TermFreqs. </span></div> |
| <div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  <span class="comment">// Document numbers are represented as differences from the previous value in the sequence.</span></div> |
| <div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  <span class="comment">// Case 2: current field stores payloads</span></div> |
| <div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  <span class="comment">// SkipDatum --> DocSkip, PayloadLength?, FreqSkip,ProxSkip</span></div> |
| <div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  <span class="comment">// DocSkip,FreqSkip,ProxSkip --> VInt</span></div> |
| <div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  <span class="comment">// PayloadLength --> VInt </span></div> |
| <div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  <span class="comment">// In this case DocSkip/2 is the difference between</span></div> |
| <div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  <span class="comment">// the current and the previous value. If DocSkip</span></div> |
| <div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  <span class="comment">// is odd, then a PayloadLength encoded as VInt follows,</span></div> |
| <div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  <span class="comment">// if DocSkip is even, then it is assumed that the</span></div> |
| <div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  <span class="comment">// current payload length equals the length at the previous</span></div> |
| <div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  <span class="comment">// skip point</span></div> |
| <div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  <span class="keywordflow">if</span> (curStorePayloads)</div> |
| <div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  {</div> |
| <div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  <span class="keywordtype">int</span> delta = curDoc - lastSkipDoc[level];</div> |
| <div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  <span class="keywordflow">if</span> (curPayloadLength == lastSkipPayloadLength[level])</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="comment">// the current payload length equals the length at the previous skip point,</span></div> |
| <div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  <span class="comment">// so we don't store the length again</span></div> |
| <div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  skipBuffer.WriteVInt(delta * 2);</div> |
| <div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  }</div> |
| <div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  <span class="keywordflow">else</span></div> |
| <div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  {</div> |
| <div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  <span class="comment">// the payload length is different from the previous one. We shift the DocSkip, </span></div> |
| <div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  <span class="comment">// set the lowest bit and store the current payload length as VInt.</span></div> |
| <div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  skipBuffer.WriteVInt(delta * 2 + 1);</div> |
| <div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  skipBuffer.WriteVInt(curPayloadLength);</div> |
| <div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  lastSkipPayloadLength[level] = curPayloadLength;</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>  }</div> |
| <div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  <span class="keywordflow">else</span></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>  <span class="comment">// current field does not store payloads</span></div> |
| <div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  skipBuffer.WriteVInt(curDoc - lastSkipDoc[level]);</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>  skipBuffer.WriteVInt((<span class="keywordtype">int</span>) (curFreqPointer - lastSkipFreqPointer[level]));</div> |
| <div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  skipBuffer.WriteVInt((<span class="keywordtype">int</span>) (curProxPointer - lastSkipProxPointer[level]));</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>  lastSkipDoc[level] = curDoc;</div> |
| <div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  <span class="comment">//System.out.println("write doc at level " + level + ": " + curDoc);</span></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>  lastSkipFreqPointer[level] = curFreqPointer;</div> |
| <div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  lastSkipProxPointer[level] = curProxPointer;</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>  }</div> |
| <div class="line"><a name="l00143"></a><span class="lineno"> 143</span> }</div> |
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