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| <div class="title">BitVector.cs</div> </div> |
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| <div class="contents"> |
| <a href="_bit_vector_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.Support;</div> |
| <div class="line"><a name="l00020"></a><span class="lineno"><a class="code" href="_bit_vector_8cs.html#ac7fdd4fc5daf7ce3e6be563664f8bf64"> 20</a></span> <span class="keyword">using</span> <a class="code" href="_syns2_index_8cs.html#aada057080323f6e867d8f9c189276716">Directory</a> = Lucene.Net.Store.Directory;</div> |
| <div class="line"><a name="l00021"></a><span class="lineno"><a class="code" href="_bit_vector_8cs.html#a12195e9150e4d7af469b90ac95cc47ee"> 21</a></span> <span class="keyword">using</span> <a class="code" href="_byte_slice_reader_8cs.html#a12195e9150e4d7af469b90ac95cc47ee">IndexInput</a> = Lucene.Net.Store.IndexInput;</div> |
| <div class="line"><a name="l00022"></a><span class="lineno"><a class="code" href="_bit_vector_8cs.html#ade6c9dd9318ff9ca227f26d89b0ad2e5"> 22</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="l00023"></a><span class="lineno"> 23</span> </div> |
| <div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="keyword">namespace </span>Lucene.Net.Util</div> |
| <div class="line"><a name="l00025"></a><span class="lineno"> 25</span> {</div> |
| <div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  </div> |
| <div class="line"><a name="l00036"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_util_1_1_bit_vector.html"> 36</a></span>  <span class="keyword">public</span> sealed <span class="keyword">class </span><a class="code" href="class_lucene_1_1_net_1_1_util_1_1_bit_vector.html" title="Optimized implementation of a vector of bits. This is more-or-less like java.util.BitSet, but also includes the following: a count() method, which efficiently computes the number of one bits; optimized read from and write to disk; inlinable get() method; store and load, as bit set or d-gaps, depending on sparseness; ">BitVector</a> : ICloneable</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>  </div> |
| <div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  <span class="keyword">private</span> byte[] bits;</div> |
| <div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  <span class="keyword">private</span> <span class="keywordtype">int</span> size;</div> |
| <div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  <span class="keyword">private</span> <span class="keywordtype">int</span> count;</div> |
| <div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  </div> |
| <div class="line"><a name="l00044"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_util_1_1_bit_vector.html#a0ebf42699795da69472b255e21b9e9fb"> 44</a></span>  <span class="keyword">public</span> <a class="code" href="_all_term_docs_8cs.html#a3dd76cb0375a575afa01f10d189b6768">BitVector</a>(<span class="keywordtype">int</span> n)</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>  size = n;</div> |
| <div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  bits = <span class="keyword">new</span> byte[(size >> 3) + 1];</div> |
| <div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  count = 0;</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>  <span class="keyword">internal</span> <a class="code" href="_all_term_docs_8cs.html#a3dd76cb0375a575afa01f10d189b6768">BitVector</a>(byte[] bits, <span class="keywordtype">int</span> size)</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>  this.bits = bits;</div> |
| <div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  this.size = size;</div> |
| <div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  count = -1;</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>  </div> |
| <div class="line"><a name="l00058"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_util_1_1_bit_vector.html#abd024c86a9b82d44874c550ed0424e77"> 58</a></span>  <span class="keyword">public</span> System.Object Clone()</div> |
| <div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  {</div> |
| <div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  byte[] copyBits = <span class="keyword">new</span> byte[bits.Length];</div> |
| <div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  Array.Copy(bits, 0, copyBits, 0, bits.Length);</div> |
| <div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  <a class="code" href="class_lucene_1_1_net_1_1_util_1_1_bit_vector.html" title="Optimized implementation of a vector of bits. This is more-or-less like java.util.BitSet, but also includes the following: a count() method, which efficiently computes the number of one bits; optimized read from and write to disk; inlinable get() method; store and load, as bit set or d-gaps, depending on sparseness; ">BitVector</a> clone = <span class="keyword">new</span> <a class="code" href="_all_term_docs_8cs.html#a3dd76cb0375a575afa01f10d189b6768">BitVector</a>(copyBits, size);</div> |
| <div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  clone.count = count;</div> |
| <div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  <span class="keywordflow">return</span> clone;</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"><a class="code" href="class_lucene_1_1_net_1_1_util_1_1_bit_vector.html#a3d5832568c1ef85e9fdc22efc1534d82"> 68</a></span>  <span class="keyword">public</span> <span class="keywordtype">void</span> Set(<span class="keywordtype">int</span> bit)</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">if</span> (bit >= size)</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>  <span class="keywordflow">throw</span> <span class="keyword">new</span> System. IndexOutOfRangeException(<span class="stringliteral">"Index of bound "</span> + bit);</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>  bits[bit >> 3] |= (byte) (1 << (bit & 7));</div> |
| <div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  count = - 1;</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="l00081"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_util_1_1_bit_vector.html#ab212e904ff78ce45351da30ce7c691f2"> 81</a></span>  <span class="keyword">public</span> <span class="keywordtype">bool</span> GetAndSet(<span class="keywordtype">int</span> bit)</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">if</span> (bit >= size)</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>  <span class="keywordflow">throw</span> <span class="keyword">new</span> System. IndexOutOfRangeException(<span class="stringliteral">"Index of bound "</span> + bit);</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>  <span class="keywordtype">int</span> pos = bit >> 3;</div> |
| <div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  <span class="keywordtype">int</span> v = bits[pos];</div> |
| <div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  <span class="keywordtype">int</span> flag = 1 << (bit & 7);</div> |
| <div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  <span class="keywordflow">if</span> ((flag & v) != 0)</div> |
| <div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div> |
| <div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  <span class="keywordflow">else</span></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>  bits[pos] = (byte) (v | flag);</div> |
| <div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  <span class="keywordflow">if</span> (count != - 1)</div> |
| <div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  count++;</div> |
| <div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</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>  }</div> |
| <div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  </div> |
| <div class="line"><a name="l00102"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_util_1_1_bit_vector.html#ac066e860c21effe4c1968fc27e88303e"> 102</a></span>  <span class="keyword">public</span> <span class="keywordtype">void</span> Clear(<span class="keywordtype">int</span> bit)</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>  <span class="keywordflow">if</span> (bit >= size)</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>  <span class="keywordflow">throw</span> <span class="keyword">new</span> System.IndexOutOfRangeException(<span class="stringliteral">"Index of bound "</span> + bit);</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>  bits[bit >> 3] &= (byte) (~ (1 << (bit & 7)));</div> |
| <div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  count = - 1;</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>  </div> |
| <div class="line"><a name="l00115"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_util_1_1_bit_vector.html#a4f9f8be4f1fe9677e1a2ef09f8d9955a"> 115</a></span>  <span class="keyword">public</span> <span class="keywordtype">bool</span> Get(<span class="keywordtype">int</span> bit)</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>  System.Diagnostics.Debug.Assert(bit >= 0 && bit < size, <span class="stringliteral">"bit "</span> + bit + <span class="stringliteral">" is out of bounds 0.."</span> +(size - 1));</div> |
| <div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  <span class="keywordflow">return</span> (bits[bit >> 3] & (1 << (bit & 7))) != 0;</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>  </div> |
| <div class="line"><a name="l00124"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_util_1_1_bit_vector.html#afb2115e306a192ddbecba493afba9bef"> 124</a></span>  <span class="keyword">public</span> <span class="keywordtype">int</span> Size()</div> |
| <div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  {</div> |
| <div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  <span class="keywordflow">return</span> size;</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>  </div> |
| <div class="line"><a name="l00133"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_util_1_1_bit_vector.html#a71f4dab63bbad5fa643990525c347ce9"> 133</a></span>  <span class="keyword">public</span> <span class="keywordtype">int</span> Count()</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">// if the vector has been modified</span></div> |
| <div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  <span class="keywordflow">if</span> (count == - 1)</div> |
| <div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  {</div> |
| <div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  <span class="keywordtype">int</span> c = 0;</div> |
| <div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  <span class="keywordtype">int</span> end = bits.Length;</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 < end; i++)</div> |
| <div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  c += BYTE_COUNTS[bits[i] & 0xFF]; <span class="comment">// sum bits per byte</span></div> |
| <div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  count = c;</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> count;</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="l00150"></a><span class="lineno"> 150</span>  [System.Diagnostics.CodeAnalysis.SuppressMessage(<span class="stringliteral">"Microsoft.Design"</span>, <span class="stringliteral">"CA1024:UsePropertiesWhereAppropriate"</span>)]</div> |
| <div class="line"><a name="l00151"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_util_1_1_bit_vector.html#a85419024ee1b63b04c7187d0f01cb1d1"> 151</a></span>  <span class="keyword">public</span> <span class="keywordtype">int</span> GetRecomputedCount()</div> |
| <div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  {</div> |
| <div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  <span class="keywordtype">int</span> c = 0;</div> |
| <div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  <span class="keywordtype">int</span> end = bits.Length;</div> |
| <div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < end; i++)</div> |
| <div class="line"><a name="l00156"></a><span class="lineno"> 156</span>  c += BYTE_COUNTS[bits[i] & 0xFF]; <span class="comment">// sum bits per byte</span></div> |
| <div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  <span class="keywordflow">return</span> c;</div> |
| <div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  }</div> |
| <div class="line"><a name="l00159"></a><span class="lineno"> 159</span>  </div> |
| <div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  <span class="keyword">private</span> <span class="keyword">static</span> readonly byte[] BYTE_COUNTS = <span class="keyword">new</span> byte[]{0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4, 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5, 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7, 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7, 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7, 4, 5, 5, 6, 5, 6, 6, 7, 5, 6, 6, 7, 6, 7, 7, 8};</div> |
| <div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  </div> |
| <div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  </div> |
| <div class="line"><a name="l00167"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_util_1_1_bit_vector.html#a9595c45f2f8038225cd472dda027a95c"> 167</a></span>  <span class="keyword">public</span> <span class="keywordtype">void</span> Write(<a class="code" href="_syns2_index_8cs.html#aada057080323f6e867d8f9c189276716">Directory</a> d, System.String name)</div> |
| <div class="line"><a name="l00168"></a><span class="lineno"> 168</span>  {</div> |
| <div class="line"><a name="l00169"></a><span class="lineno"> 169</span>  <a class="code" href="_byte_slice_reader_8cs.html#ade6c9dd9318ff9ca227f26d89b0ad2e5">IndexOutput</a> output = d.CreateOutput(name);</div> |
| <div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  <span class="keywordflow">try</span></div> |
| <div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  {</div> |
| <div class="line"><a name="l00172"></a><span class="lineno"> 172</span>  <span class="keywordflow">if</span> (IsSparse())</div> |
| <div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  {</div> |
| <div class="line"><a name="l00174"></a><span class="lineno"> 174</span>  WriteDgaps(output); <span class="comment">// sparse bit-set more efficiently saved as d-gaps.</span></div> |
| <div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  }</div> |
| <div class="line"><a name="l00176"></a><span class="lineno"> 176</span>  <span class="keywordflow">else</span></div> |
| <div class="line"><a name="l00177"></a><span class="lineno"> 177</span>  {</div> |
| <div class="line"><a name="l00178"></a><span class="lineno"> 178</span>  WriteBits(output);</div> |
| <div class="line"><a name="l00179"></a><span class="lineno"> 179</span>  }</div> |
| <div class="line"><a name="l00180"></a><span class="lineno"> 180</span>  }</div> |
| <div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  <span class="keywordflow">finally</span></div> |
| <div class="line"><a name="l00182"></a><span class="lineno"> 182</span>  {</div> |
| <div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  output.Close();</div> |
| <div class="line"><a name="l00184"></a><span class="lineno"> 184</span>  }</div> |
| <div class="line"><a name="l00185"></a><span class="lineno"> 185</span>  }</div> |
| <div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  </div> |
| <div class="line"><a name="l00188"></a><span class="lineno"> 188</span>  <span class="keyword">private</span> <span class="keywordtype">void</span> WriteBits(<a class="code" href="_byte_slice_reader_8cs.html#ade6c9dd9318ff9ca227f26d89b0ad2e5">IndexOutput</a> output)</div> |
| <div class="line"><a name="l00189"></a><span class="lineno"> 189</span>  {</div> |
| <div class="line"><a name="l00190"></a><span class="lineno"> 190</span>  output.WriteInt(Size()); <span class="comment">// write size</span></div> |
| <div class="line"><a name="l00191"></a><span class="lineno"> 191</span>  output.WriteInt(Count()); <span class="comment">// write count</span></div> |
| <div class="line"><a name="l00192"></a><span class="lineno"> 192</span>  output.WriteBytes(bits, bits.Length);</div> |
| <div class="line"><a name="l00193"></a><span class="lineno"> 193</span>  }</div> |
| <div class="line"><a name="l00194"></a><span class="lineno"> 194</span>  </div> |
| <div class="line"><a name="l00196"></a><span class="lineno"> 196</span>  <span class="keyword">private</span> <span class="keywordtype">void</span> WriteDgaps(<a class="code" href="_byte_slice_reader_8cs.html#ade6c9dd9318ff9ca227f26d89b0ad2e5">IndexOutput</a> output)</div> |
| <div class="line"><a name="l00197"></a><span class="lineno"> 197</span>  {</div> |
| <div class="line"><a name="l00198"></a><span class="lineno"> 198</span>  output.WriteInt(- 1); <span class="comment">// mark using d-gaps </span></div> |
| <div class="line"><a name="l00199"></a><span class="lineno"> 199</span>  output.WriteInt(Size()); <span class="comment">// write size</span></div> |
| <div class="line"><a name="l00200"></a><span class="lineno"> 200</span>  output.WriteInt(Count()); <span class="comment">// write count</span></div> |
| <div class="line"><a name="l00201"></a><span class="lineno"> 201</span>  <span class="keywordtype">int</span> last = 0;</div> |
| <div class="line"><a name="l00202"></a><span class="lineno"> 202</span>  <span class="keywordtype">int</span> n = Count();</div> |
| <div class="line"><a name="l00203"></a><span class="lineno"> 203</span>  <span class="keywordtype">int</span> m = bits.Length;</div> |
| <div class="line"><a name="l00204"></a><span class="lineno"> 204</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < m && n > 0; i++)</div> |
| <div class="line"><a name="l00205"></a><span class="lineno"> 205</span>  {</div> |
| <div class="line"><a name="l00206"></a><span class="lineno"> 206</span>  <span class="keywordflow">if</span> (bits[i] != 0)</div> |
| <div class="line"><a name="l00207"></a><span class="lineno"> 207</span>  {</div> |
| <div class="line"><a name="l00208"></a><span class="lineno"> 208</span>  output.WriteVInt(i - last);</div> |
| <div class="line"><a name="l00209"></a><span class="lineno"> 209</span>  output.WriteByte(bits[i]);</div> |
| <div class="line"><a name="l00210"></a><span class="lineno"> 210</span>  last = i;</div> |
| <div class="line"><a name="l00211"></a><span class="lineno"> 211</span>  n -= BYTE_COUNTS[bits[i] & 0xFF];</div> |
| <div class="line"><a name="l00212"></a><span class="lineno"> 212</span>  }</div> |
| <div class="line"><a name="l00213"></a><span class="lineno"> 213</span>  }</div> |
| <div class="line"><a name="l00214"></a><span class="lineno"> 214</span>  }</div> |
| <div class="line"><a name="l00215"></a><span class="lineno"> 215</span>  </div> |
| <div class="line"><a name="l00217"></a><span class="lineno"> 217</span>  <span class="keyword">private</span> <span class="keywordtype">bool</span> IsSparse()</div> |
| <div class="line"><a name="l00218"></a><span class="lineno"> 218</span>  {</div> |
| <div class="line"><a name="l00219"></a><span class="lineno"> 219</span>  <span class="comment">// note: order of comparisons below set to favor smaller values (no binary range search.)</span></div> |
| <div class="line"><a name="l00220"></a><span class="lineno"> 220</span>  <span class="comment">// note: adding 4 because we start with ((int) -1) to indicate d-gaps format.</span></div> |
| <div class="line"><a name="l00221"></a><span class="lineno"> 221</span>  <span class="comment">// note: we write the d-gap for the byte number, and the byte (bits[i]) itself, therefore</span></div> |
| <div class="line"><a name="l00222"></a><span class="lineno"> 222</span>  <span class="comment">// multiplying count by (8+8) or (8+16) or (8+24) etc.:</span></div> |
| <div class="line"><a name="l00223"></a><span class="lineno"> 223</span>  <span class="comment">// - first 8 for writing bits[i] (1 byte vs. 1 bit), and </span></div> |
| <div class="line"><a name="l00224"></a><span class="lineno"> 224</span>  <span class="comment">// - second part for writing the byte-number d-gap as vint. </span></div> |
| <div class="line"><a name="l00225"></a><span class="lineno"> 225</span>  <span class="comment">// note: factor is for read/write of byte-arrays being faster than vints. </span></div> |
| <div class="line"><a name="l00226"></a><span class="lineno"> 226</span>  <span class="keywordtype">int</span> factor = 10;</div> |
| <div class="line"><a name="l00227"></a><span class="lineno"> 227</span>  <span class="keywordflow">if</span> (bits.Length < (1 << 7))</div> |
| <div class="line"><a name="l00228"></a><span class="lineno"> 228</span>  <span class="keywordflow">return</span> factor * (4 + (8 + 8) * Count()) < Size();</div> |
| <div class="line"><a name="l00229"></a><span class="lineno"> 229</span>  <span class="keywordflow">if</span> (bits.Length < (1 << 14))</div> |
| <div class="line"><a name="l00230"></a><span class="lineno"> 230</span>  <span class="keywordflow">return</span> factor * (4 + (8 + 16) * Count()) < Size();</div> |
| <div class="line"><a name="l00231"></a><span class="lineno"> 231</span>  <span class="keywordflow">if</span> (bits.Length < (1 << 21))</div> |
| <div class="line"><a name="l00232"></a><span class="lineno"> 232</span>  <span class="keywordflow">return</span> factor * (4 + (8 + 24) * Count()) < Size();</div> |
| <div class="line"><a name="l00233"></a><span class="lineno"> 233</span>  <span class="keywordflow">if</span> (bits.Length < (1 << 28))</div> |
| <div class="line"><a name="l00234"></a><span class="lineno"> 234</span>  <span class="keywordflow">return</span> factor * (4 + (8 + 32) * Count()) < Size();</div> |
| <div class="line"><a name="l00235"></a><span class="lineno"> 235</span>  <span class="keywordflow">return</span> factor * (4 + (8 + 40) * Count()) < Size();</div> |
| <div class="line"><a name="l00236"></a><span class="lineno"> 236</span>  }</div> |
| <div class="line"><a name="l00237"></a><span class="lineno"> 237</span>  </div> |
| <div class="line"><a name="l00241"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_util_1_1_bit_vector.html#afdcbc057149773bdb0e06c1305c6ef96"> 241</a></span>  <span class="keyword">public</span> <a class="code" href="_all_term_docs_8cs.html#a3dd76cb0375a575afa01f10d189b6768">BitVector</a>(<a class="code" href="_syns2_index_8cs.html#aada057080323f6e867d8f9c189276716">Directory</a> d, System.String name)</div> |
| <div class="line"><a name="l00242"></a><span class="lineno"> 242</span>  {</div> |
| <div class="line"><a name="l00243"></a><span class="lineno"> 243</span>  <a class="code" href="_byte_slice_reader_8cs.html#a12195e9150e4d7af469b90ac95cc47ee">IndexInput</a> input = d.OpenInput(name);</div> |
| <div class="line"><a name="l00244"></a><span class="lineno"> 244</span>  <span class="keywordflow">try</span></div> |
| <div class="line"><a name="l00245"></a><span class="lineno"> 245</span>  {</div> |
| <div class="line"><a name="l00246"></a><span class="lineno"> 246</span>  size = input.ReadInt(); <span class="comment">// read size</span></div> |
| <div class="line"><a name="l00247"></a><span class="lineno"> 247</span>  <span class="keywordflow">if</span> (size == - 1)</div> |
| <div class="line"><a name="l00248"></a><span class="lineno"> 248</span>  {</div> |
| <div class="line"><a name="l00249"></a><span class="lineno"> 249</span>  ReadDgaps(input);</div> |
| <div class="line"><a name="l00250"></a><span class="lineno"> 250</span>  }</div> |
| <div class="line"><a name="l00251"></a><span class="lineno"> 251</span>  <span class="keywordflow">else</span></div> |
| <div class="line"><a name="l00252"></a><span class="lineno"> 252</span>  {</div> |
| <div class="line"><a name="l00253"></a><span class="lineno"> 253</span>  ReadBits(input);</div> |
| <div class="line"><a name="l00254"></a><span class="lineno"> 254</span>  }</div> |
| <div class="line"><a name="l00255"></a><span class="lineno"> 255</span>  }</div> |
| <div class="line"><a name="l00256"></a><span class="lineno"> 256</span>  <span class="keywordflow">finally</span></div> |
| <div class="line"><a name="l00257"></a><span class="lineno"> 257</span>  {</div> |
| <div class="line"><a name="l00258"></a><span class="lineno"> 258</span>  input.Close();</div> |
| <div class="line"><a name="l00259"></a><span class="lineno"> 259</span>  }</div> |
| <div class="line"><a name="l00260"></a><span class="lineno"> 260</span>  }</div> |
| <div class="line"><a name="l00261"></a><span class="lineno"> 261</span>  </div> |
| <div class="line"><a name="l00263"></a><span class="lineno"> 263</span>  <span class="keyword">private</span> <span class="keywordtype">void</span> ReadBits(<a class="code" href="_byte_slice_reader_8cs.html#a12195e9150e4d7af469b90ac95cc47ee">IndexInput</a> input)</div> |
| <div class="line"><a name="l00264"></a><span class="lineno"> 264</span>  {</div> |
| <div class="line"><a name="l00265"></a><span class="lineno"> 265</span>  count = input.ReadInt(); <span class="comment">// read count</span></div> |
| <div class="line"><a name="l00266"></a><span class="lineno"> 266</span>  bits = <span class="keyword">new</span> byte[(size >> 3) + 1]; <span class="comment">// allocate bits</span></div> |
| <div class="line"><a name="l00267"></a><span class="lineno"> 267</span>  input.ReadBytes(bits, 0, bits.Length);</div> |
| <div class="line"><a name="l00268"></a><span class="lineno"> 268</span>  }</div> |
| <div class="line"><a name="l00269"></a><span class="lineno"> 269</span>  </div> |
| <div class="line"><a name="l00271"></a><span class="lineno"> 271</span>  <span class="keyword">private</span> <span class="keywordtype">void</span> ReadDgaps(<a class="code" href="_byte_slice_reader_8cs.html#a12195e9150e4d7af469b90ac95cc47ee">IndexInput</a> input)</div> |
| <div class="line"><a name="l00272"></a><span class="lineno"> 272</span>  {</div> |
| <div class="line"><a name="l00273"></a><span class="lineno"> 273</span>  size = input.ReadInt(); <span class="comment">// (re)read size</span></div> |
| <div class="line"><a name="l00274"></a><span class="lineno"> 274</span>  count = input.ReadInt(); <span class="comment">// read count</span></div> |
| <div class="line"><a name="l00275"></a><span class="lineno"> 275</span>  bits = <span class="keyword">new</span> byte[(size >> 3) + 1]; <span class="comment">// allocate bits</span></div> |
| <div class="line"><a name="l00276"></a><span class="lineno"> 276</span>  <span class="keywordtype">int</span> last = 0;</div> |
| <div class="line"><a name="l00277"></a><span class="lineno"> 277</span>  <span class="keywordtype">int</span> n = Count();</div> |
| <div class="line"><a name="l00278"></a><span class="lineno"> 278</span>  <span class="keywordflow">while</span> (n > 0)</div> |
| <div class="line"><a name="l00279"></a><span class="lineno"> 279</span>  {</div> |
| <div class="line"><a name="l00280"></a><span class="lineno"> 280</span>  last += input.ReadVInt();</div> |
| <div class="line"><a name="l00281"></a><span class="lineno"> 281</span>  bits[last] = input.ReadByte();</div> |
| <div class="line"><a name="l00282"></a><span class="lineno"> 282</span>  n -= BYTE_COUNTS[bits[last] & 0xFF];</div> |
| <div class="line"><a name="l00283"></a><span class="lineno"> 283</span>  }</div> |
| <div class="line"><a name="l00284"></a><span class="lineno"> 284</span>  }</div> |
| <div class="line"><a name="l00285"></a><span class="lineno"> 285</span>  </div> |
| <div class="line"><a name="l00295"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_util_1_1_bit_vector.html#aa94eb78df478944c1b62a1cc5f5fbd54"> 295</a></span>  <span class="keyword">public</span> <a class="code" href="class_lucene_1_1_net_1_1_util_1_1_bit_vector.html" title="Optimized implementation of a vector of bits. This is more-or-less like java.util.BitSet, but also includes the following: a count() method, which efficiently computes the number of one bits; optimized read from and write to disk; inlinable get() method; store and load, as bit set or d-gaps, depending on sparseness; ">BitVector</a> Subset(<span class="keywordtype">int</span> start, <span class="keywordtype">int</span> end)</div> |
| <div class="line"><a name="l00296"></a><span class="lineno"> 296</span>  {</div> |
| <div class="line"><a name="l00297"></a><span class="lineno"> 297</span>  <span class="keywordflow">if</span> (start < 0 || end > Size() || end < start)</div> |
| <div class="line"><a name="l00298"></a><span class="lineno"> 298</span>  <span class="keywordflow">throw</span> <span class="keyword">new</span> System.IndexOutOfRangeException();</div> |
| <div class="line"><a name="l00299"></a><span class="lineno"> 299</span>  <span class="comment">// Special case -- return empty vector is start == end</span></div> |
| <div class="line"><a name="l00300"></a><span class="lineno"> 300</span>  <span class="keywordflow">if</span> (end == start)</div> |
| <div class="line"><a name="l00301"></a><span class="lineno"> 301</span>  <span class="keywordflow">return</span> <span class="keyword">new</span> <a class="code" href="_all_term_docs_8cs.html#a3dd76cb0375a575afa01f10d189b6768">BitVector</a>(0);</div> |
| <div class="line"><a name="l00302"></a><span class="lineno"> 302</span>  byte[] bits = <span class="keyword">new</span> byte[(<a class="code" href="class_lucene_1_1_net_1_1_support_1_1_number.html" title="A simple class for number conversions. ">Number</a>.<a class="code" href="class_lucene_1_1_net_1_1_support_1_1_number.html#aafe44e2acf7feacad6abd2a425730644" title="Performs an unsigned bitwise right shift with the specified number ">URShift</a>((end - start - 1), 3)) + 1];</div> |
| <div class="line"><a name="l00303"></a><span class="lineno"> 303</span>  <span class="keywordtype">int</span> s = <a class="code" href="class_lucene_1_1_net_1_1_support_1_1_number.html" title="A simple class for number conversions. ">Number</a>.<a class="code" href="class_lucene_1_1_net_1_1_support_1_1_number.html#aafe44e2acf7feacad6abd2a425730644" title="Performs an unsigned bitwise right shift with the specified number ">URShift</a>(start, 3);</div> |
| <div class="line"><a name="l00304"></a><span class="lineno"> 304</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < bits.Length; i++)</div> |
| <div class="line"><a name="l00305"></a><span class="lineno"> 305</span>  {</div> |
| <div class="line"><a name="l00306"></a><span class="lineno"> 306</span>  <span class="keywordtype">int</span> cur = 0xFF & this.bits[i + s];</div> |
| <div class="line"><a name="l00307"></a><span class="lineno"> 307</span>  <span class="keywordtype">int</span> next = i + s + 1 >= this.bits.Length?0:0xFF & this.bits[i + s + 1];</div> |
| <div class="line"><a name="l00308"></a><span class="lineno"> 308</span>  bits[i] = (byte) ((<a class="code" href="class_lucene_1_1_net_1_1_support_1_1_number.html" title="A simple class for number conversions. ">Number</a>.<a class="code" href="class_lucene_1_1_net_1_1_support_1_1_number.html#aafe44e2acf7feacad6abd2a425730644" title="Performs an unsigned bitwise right shift with the specified number ">URShift</a>(cur, (start & 7))) | ((next << (8 - (start & 7)))));</div> |
| <div class="line"><a name="l00309"></a><span class="lineno"> 309</span>  }</div> |
| <div class="line"><a name="l00310"></a><span class="lineno"> 310</span>  <span class="keywordtype">int</span> bitsToClear = (bits.Length * 8 - (end - start)) % 8;</div> |
| <div class="line"><a name="l00311"></a><span class="lineno"> 311</span>  bits[bits.Length - 1] &= (byte) (~ (0xFF << (8 - bitsToClear)));</div> |
| <div class="line"><a name="l00312"></a><span class="lineno"> 312</span>  <span class="keywordflow">return</span> <span class="keyword">new</span> <a class="code" href="_all_term_docs_8cs.html#a3dd76cb0375a575afa01f10d189b6768">BitVector</a>(bits, end - start);</div> |
| <div class="line"><a name="l00313"></a><span class="lineno"> 313</span>  }</div> |
| <div class="line"><a name="l00314"></a><span class="lineno"> 314</span>  }</div> |
| <div class="line"><a name="l00315"></a><span class="lineno"> 315</span> }</div> |
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