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| <div class="title">EdgeNGramTokenFilter.cs</div> </div> |
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| <a href="_edge_n_gram_token_filter_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.IO;</div> |
| <div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="keyword">using</span> System.Collections;</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">using</span> Lucene.Net.Analysis;</div> |
| <div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="keyword">using</span> Lucene.Net.Analysis.Tokenattributes;</div> |
| <div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="keyword">using</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"><a class="code" href="namespace_lucene_1_1_net_1_1_analysis_1_1_n_gram.html"> 26</a></span> <span class="keyword">namespace </span>Lucene.Net.Analysis.NGram</div> |
| <div class="line"><a name="l00027"></a><span class="lineno"> 27</span> {</div> |
| <div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  <span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">class </span>SideExtensions</div> |
| <div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  {</div> |
| <div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  <span class="keyword">public</span> <span class="keyword">static</span> <span class="keywordtype">string</span> GetLabel(<span class="keyword">this</span> <a class="code" href="namespace_lucene_1_1_net_1_1_analysis_1_1_n_gram.html#a0903437adca809d22ddebafb5e39cfa0" title="Specifies which side of the input the n-gram should be generated from ">Side</a> theSide)</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="keywordflow">switch</span>(theSide)</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>  <span class="keywordflow">case</span> <a class="code" href="namespace_lucene_1_1_net_1_1_analysis_1_1_n_gram.html#a0903437adca809d22ddebafb5e39cfa0" title="Specifies which side of the input the n-gram should be generated from ">Side</a>.FRONT:</div> |
| <div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  <span class="keywordflow">return</span> <span class="stringliteral">"front"</span>;</div> |
| <div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  <span class="keywordflow">case</span> <a class="code" href="namespace_lucene_1_1_net_1_1_analysis_1_1_n_gram.html#a0903437adca809d22ddebafb5e39cfa0" title="Specifies which side of the input the n-gram should be generated from ">Side</a>.BACK:</div> |
| <div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  <span class="keywordflow">return</span> <span class="stringliteral">"back"</span>;</div> |
| <div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  <span class="keywordflow">default</span>:</div> |
| <div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  <span class="keywordflow">throw</span> <span class="keyword">new</span> ArgumentException(<span class="keywordtype">string</span>.Format(<span class="stringliteral">"{0} is not a valid value for EdgeNGramTokenFilter.Side"</span>, theSide));</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>  }</div> |
| <div class="line"><a name="l00042"></a><span class="lineno"> 42</span> </div> |
| <div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  <span class="keyword">public</span> <span class="keyword">static</span> <a class="code" href="namespace_lucene_1_1_net_1_1_analysis_1_1_n_gram.html#a0903437adca809d22ddebafb5e39cfa0" title="Specifies which side of the input the n-gram should be generated from ">Side</a> GetSide(<span class="keywordtype">string</span> sideName)</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="keywordflow">if</span> (<a class="code" href="namespace_lucene_1_1_net_1_1_analysis_1_1_n_gram.html#a0903437adca809d22ddebafb5e39cfa0" title="Specifies which side of the input the n-gram should be generated from ">Side</a>.FRONT.GetLabel() == sideName)</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="keywordflow">return</span> <a class="code" href="namespace_lucene_1_1_net_1_1_analysis_1_1_n_gram.html#a0903437adca809d22ddebafb5e39cfa0" title="Specifies which side of the input the n-gram should be generated from ">Side</a>.FRONT;</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> </div> |
| <div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  <span class="keywordflow">if</span> (<a class="code" href="namespace_lucene_1_1_net_1_1_analysis_1_1_n_gram.html#a0903437adca809d22ddebafb5e39cfa0" title="Specifies which side of the input the n-gram should be generated from ">Side</a>.BACK.GetLabel() == sideName)</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="keywordflow">return</span> <a class="code" href="namespace_lucene_1_1_net_1_1_analysis_1_1_n_gram.html#a0903437adca809d22ddebafb5e39cfa0" title="Specifies which side of the input the n-gram should be generated from ">Side</a>.BACK;</div> |
| <div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  }</div> |
| <div class="line"><a name="l00054"></a><span class="lineno"> 54</span> </div> |
| <div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  <span class="keywordflow">return</span> (<a class="code" href="namespace_lucene_1_1_net_1_1_analysis_1_1_n_gram.html#a0903437adca809d22ddebafb5e39cfa0" title="Specifies which side of the input the n-gram should be generated from ">Side</a>)(-1); <span class="comment">// TODO: returning null instead of null? Should an exception be thrown instead?</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>  }</div> |
| <div class="line"><a name="l00058"></a><span class="lineno"> 58</span> </div> |
| <div class="line"><a name="l00062"></a><span class="lineno"><a class="code" href="namespace_lucene_1_1_net_1_1_analysis_1_1_n_gram.html#a0903437adca809d22ddebafb5e39cfa0"> 62</a></span>  <span class="keyword">public</span> <span class="keyword">enum</span> <a class="code" href="namespace_lucene_1_1_net_1_1_analysis_1_1_n_gram.html#a0903437adca809d22ddebafb5e39cfa0" title="Specifies which side of the input the n-gram should be generated from ">Side</a></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>  FRONT,</div> |
| <div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  BACK</div> |
| <div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  }</div> |
| <div class="line"><a name="l00067"></a><span class="lineno"> 67</span> </div> |
| <div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  <span class="comment">/*</span></div> |
| <div class="line"><a name="l00069"></a><span class="lineno"> 69</span> <span class="comment"> * Tokenizes the given token into n-grams of given size(s).</span></div> |
| <div class="line"><a name="l00070"></a><span class="lineno"> 70</span> <span class="comment"> * <p></span></div> |
| <div class="line"><a name="l00071"></a><span class="lineno"> 71</span> <span class="comment"> * This <see cref="TokenFilter"/> create n-grams from the beginning edge or ending edge of a input token.</span></div> |
| <div class="line"><a name="l00072"></a><span class="lineno"> 72</span> <span class="comment"> * </p></span></div> |
| <div class="line"><a name="l00073"></a><span class="lineno"> 73</span> <span class="comment"> */</span></div> |
| <div class="line"><a name="l00074"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_n_gram_1_1_edge_n_gram_token_filter.html"> 74</a></span>  <span class="keyword">public</span> sealed <span class="keyword">class </span><a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_n_gram_1_1_edge_n_gram_token_filter.html">EdgeNGramTokenFilter</a> : <a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_token_filter.html" title="A TokenFilter is a TokenStream whose input is another TokenStream. This is an abstract class; subclas...">TokenFilter</a></div> |
| <div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  {</div> |
| <div class="line"><a name="l00076"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_n_gram_1_1_edge_n_gram_token_filter.html#a69480d6fabc8bf2b5bee8986cbf5b604"> 76</a></span>  <span class="keyword">public</span> <span class="keyword">static</span> <a class="code" href="namespace_lucene_1_1_net_1_1_analysis_1_1_n_gram.html#a0903437adca809d22ddebafb5e39cfa0" title="Specifies which side of the input the n-gram should be generated from ">Side</a> DEFAULT_SIDE = <a class="code" href="namespace_lucene_1_1_net_1_1_analysis_1_1_n_gram.html#a0903437adca809d22ddebafb5e39cfa0" title="Specifies which side of the input the n-gram should be generated from ">Side</a>.FRONT;</div> |
| <div class="line"><a name="l00077"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_n_gram_1_1_edge_n_gram_token_filter.html#a04d2981f7d65127126b7a2b289db762d"> 77</a></span>  <span class="keyword">public</span> <span class="keyword">static</span> <span class="keywordtype">int</span> DEFAULT_MAX_GRAM_SIZE = 1;</div> |
| <div class="line"><a name="l00078"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_n_gram_1_1_edge_n_gram_token_filter.html#a888b0b1e0b08df8afeaf5dfb78ecbb99"> 78</a></span>  <span class="keyword">public</span> <span class="keyword">static</span> <span class="keywordtype">int</span> DEFAULT_MIN_GRAM_SIZE = 1;</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>  <span class="keyword">private</span> <span class="keywordtype">int</span> minGram;</div> |
| <div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  <span class="keyword">private</span> <span class="keywordtype">int</span> maxGram;</div> |
| <div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  <span class="keyword">private</span> <a class="code" href="namespace_lucene_1_1_net_1_1_analysis_1_1_n_gram.html#a0903437adca809d22ddebafb5e39cfa0" title="Specifies which side of the input the n-gram should be generated from ">Side</a> side;</div> |
| <div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  <span class="keyword">private</span> <span class="keywordtype">char</span>[] curTermBuffer;</div> |
| <div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  <span class="keyword">private</span> <span class="keywordtype">int</span> curTermLength;</div> |
| <div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  <span class="keyword">private</span> <span class="keywordtype">int</span> curGramSize;</div> |
| <div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  <span class="keyword">private</span> <span class="keywordtype">int</span> tokStart;</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">private</span> <a class="code" href="interface_lucene_1_1_net_1_1_analysis_1_1_tokenattributes_1_1_i_term_attribute.html" title="The term text of a Token.">ITermAttribute</a> termAtt;</div> |
| <div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  <span class="keyword">private</span> <a class="code" href="interface_lucene_1_1_net_1_1_analysis_1_1_tokenattributes_1_1_i_offset_attribute.html" title="The start and end character offset of a Token. ">IOffsetAttribute</a> offsetAtt;</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"><a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_n_gram_1_1_edge_n_gram_token_filter.html#a2e2edc743bbe867eaa9dbfe566ca50f8"> 92</a></span>  <span class="keyword">protected</span> <a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_n_gram_1_1_edge_n_gram_token_filter.html">EdgeNGramTokenFilter</a>(<a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_token_stream.html" title="A TokenStream enumerates the sequence of tokens, either from Fields of a Document or from query text...">TokenStream</a> input) : base(input)</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>  this.termAtt = AddAttribute<ITermAttribute>();</div> |
| <div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  this.offsetAtt = AddAttribute<IOffsetAttribute>();</div> |
| <div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  }</div> |
| <div class="line"><a name="l00097"></a><span class="lineno"> 97</span> </div> |
| <div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  <span class="comment">/*</span></div> |
| <div class="line"><a name="l00099"></a><span class="lineno"> 99</span> <span class="comment"> * Creates EdgeNGramTokenFilter that can generate n-grams in the sizes of the given range</span></div> |
| <div class="line"><a name="l00100"></a><span class="lineno"> 100</span> <span class="comment"> *</span></div> |
| <div class="line"><a name="l00101"></a><span class="lineno"> 101</span> <span class="comment"> * <param name="input"><see cref="TokenStream"/> holding the input to be tokenized</param></span></div> |
| <div class="line"><a name="l00102"></a><span class="lineno"> 102</span> <span class="comment"> * <param name="side">the <see cref="Side"/> from which to chop off an n-gram</param></span></div> |
| <div class="line"><a name="l00103"></a><span class="lineno"> 103</span> <span class="comment"> * <param name="minGram">the smallest n-gram to generate</param></span></div> |
| <div class="line"><a name="l00104"></a><span class="lineno"> 104</span> <span class="comment"> * <param name="maxGram">the largest n-gram to generate</param></span></div> |
| <div class="line"><a name="l00105"></a><span class="lineno"> 105</span> <span class="comment"> */</span></div> |
| <div class="line"><a name="l00106"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_n_gram_1_1_edge_n_gram_token_filter.html#ac3658e2fcf63a9b9e3a8336890c5b771"> 106</a></span>  <span class="keyword">public</span> <a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_n_gram_1_1_edge_n_gram_token_filter.html">EdgeNGramTokenFilter</a>(<a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_token_stream.html" title="A TokenStream enumerates the sequence of tokens, either from Fields of a Document or from query text...">TokenStream</a> input, <a class="code" href="namespace_lucene_1_1_net_1_1_analysis_1_1_n_gram.html#a0903437adca809d22ddebafb5e39cfa0" title="Specifies which side of the input the n-gram should be generated from ">Side</a> side, <span class="keywordtype">int</span> minGram, <span class="keywordtype">int</span> maxGram)</div> |
| <div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  : base(input)</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> </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">if</span> (side != <a class="code" href="namespace_lucene_1_1_net_1_1_analysis_1_1_n_gram.html#a0903437adca809d22ddebafb5e39cfa0" title="Specifies which side of the input the n-gram should be generated from ">Side</a>.FRONT && side != <a class="code" href="namespace_lucene_1_1_net_1_1_analysis_1_1_n_gram.html#a0903437adca809d22ddebafb5e39cfa0" title="Specifies which side of the input the n-gram should be generated from ">Side</a>.BACK)</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>  <span class="keywordflow">throw</span> <span class="keyword">new</span> System.ArgumentException(<span class="stringliteral">"sideLabel must be either front or back"</span>);</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> </div> |
| <div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  <span class="keywordflow">if</span> (minGram < 1)</div> |
| <div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  {</div> |
| <div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  <span class="keywordflow">throw</span> <span class="keyword">new</span> System.ArgumentException(<span class="stringliteral">"minGram must be greater than zero"</span>);</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="l00121"></a><span class="lineno"> 121</span>  <span class="keywordflow">if</span> (minGram > maxGram)</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="keywordflow">throw</span> <span class="keyword">new</span> System.ArgumentException(<span class="stringliteral">"minGram must not be greater than maxGram"</span>);</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> </div> |
| <div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  this.minGram = minGram;</div> |
| <div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  this.maxGram = maxGram;</div> |
| <div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  this.side = side;</div> |
| <div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  this.termAtt = AddAttribute<ITermAttribute>();</div> |
| <div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  this.offsetAtt = AddAttribute<IOffsetAttribute>();</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> </div> |
| <div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  <span class="comment">/*</span></div> |
| <div class="line"><a name="l00134"></a><span class="lineno"> 134</span> <span class="comment"> * Creates EdgeNGramTokenFilter that can generate n-grams in the sizes of the given range</span></div> |
| <div class="line"><a name="l00135"></a><span class="lineno"> 135</span> <span class="comment"> *</span></div> |
| <div class="line"><a name="l00136"></a><span class="lineno"> 136</span> <span class="comment"> * <param name="input"><see cref="TokenStream"/> holding the input to be tokenized</param></span></div> |
| <div class="line"><a name="l00137"></a><span class="lineno"> 137</span> <span class="comment"> * <param name="sideLabel">the name of the <see cref="Side"/> from which to chop off an n-gram</param></span></div> |
| <div class="line"><a name="l00138"></a><span class="lineno"> 138</span> <span class="comment"> * <param name="minGram">the smallest n-gram to generate</param></span></div> |
| <div class="line"><a name="l00139"></a><span class="lineno"> 139</span> <span class="comment"> * <param name="maxGram">the largest n-gram to generate</param></span></div> |
| <div class="line"><a name="l00140"></a><span class="lineno"> 140</span> <span class="comment"> */</span></div> |
| <div class="line"><a name="l00141"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_n_gram_1_1_edge_n_gram_token_filter.html#a57736df72a6b6e4953a34f23a2948e82"> 141</a></span>  <span class="keyword">public</span> <a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_n_gram_1_1_edge_n_gram_token_filter.html">EdgeNGramTokenFilter</a>(<a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_token_stream.html" title="A TokenStream enumerates the sequence of tokens, either from Fields of a Document or from query text...">TokenStream</a> input, <span class="keywordtype">string</span> sideLabel, <span class="keywordtype">int</span> minGram, <span class="keywordtype">int</span> maxGram)</div> |
| <div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  : this(input, SideExtensions.GetSide(sideLabel), minGram, maxGram)</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>  }</div> |
| <div class="line"><a name="l00145"></a><span class="lineno"> 145</span> </div> |
| <div class="line"><a name="l00146"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_n_gram_1_1_edge_n_gram_token_filter.html#a8e844590fb9a59e4d837628350ddeec7"> 146</a></span>  <span class="keyword">public</span> <span class="keyword">override</span> <span class="keywordtype">bool</span> IncrementToken()</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>  <span class="keywordflow">while</span> (<span class="keyword">true</span>)</div> |
| <div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  {</div> |
| <div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  <span class="keywordflow">if</span> (curTermBuffer == null)</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">if</span> (!input.IncrementToken())</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>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div> |
| <div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  }</div> |
| <div class="line"><a name="l00156"></a><span class="lineno"> 156</span>  <span class="keywordflow">else</span></div> |
| <div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  {</div> |
| <div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  curTermBuffer = (<span class="keywordtype">char</span>[])termAtt.TermBuffer().Clone();</div> |
| <div class="line"><a name="l00159"></a><span class="lineno"> 159</span>  curTermLength = termAtt.TermLength();</div> |
| <div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  curGramSize = minGram;</div> |
| <div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  tokStart = offsetAtt.StartOffset;</div> |
| <div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  }</div> |
| <div class="line"><a name="l00163"></a><span class="lineno"> 163</span>  }</div> |
| <div class="line"><a name="l00164"></a><span class="lineno"> 164</span>  <span class="keywordflow">if</span> (curGramSize <= maxGram)</div> |
| <div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  {</div> |
| <div class="line"><a name="l00166"></a><span class="lineno"> 166</span>  <span class="keywordflow">if</span> (!(curGramSize > curTermLength <span class="comment">// if the remaining input is too short, we can't generate any n-grams</span></div> |
| <div class="line"><a name="l00167"></a><span class="lineno"> 167</span>  || curGramSize > maxGram))</div> |
| <div class="line"><a name="l00168"></a><span class="lineno"> 168</span>  { <span class="comment">// if we have hit the end of our n-gram size range, quit</span></div> |
| <div class="line"><a name="l00169"></a><span class="lineno"> 169</span>  <span class="comment">// grab gramSize chars from front or back</span></div> |
| <div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  <span class="keywordtype">int</span> start = side == <a class="code" href="namespace_lucene_1_1_net_1_1_analysis_1_1_n_gram.html#a0903437adca809d22ddebafb5e39cfa0" title="Specifies which side of the input the n-gram should be generated from ">Side</a>.FRONT ? 0 : curTermLength - curGramSize;</div> |
| <div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  <span class="keywordtype">int</span> end = start + curGramSize;</div> |
| <div class="line"><a name="l00172"></a><span class="lineno"> 172</span>  ClearAttributes();</div> |
| <div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  offsetAtt.SetOffset(tokStart + start, tokStart + end);</div> |
| <div class="line"><a name="l00174"></a><span class="lineno"> 174</span>  termAtt.SetTermBuffer(curTermBuffer, start, curGramSize);</div> |
| <div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  curGramSize++;</div> |
| <div class="line"><a name="l00176"></a><span class="lineno"> 176</span>  <span class="keywordflow">return</span> <span class="keyword">true</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>  }</div> |
| <div class="line"><a name="l00179"></a><span class="lineno"> 179</span>  curTermBuffer = null;</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>  }</div> |
| <div class="line"><a name="l00182"></a><span class="lineno"> 182</span> </div> |
| <div class="line"><a name="l00183"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_n_gram_1_1_edge_n_gram_token_filter.html#af896bc6b38a820b3ce5e082d76dc4368"> 183</a></span>  <span class="keyword">public</span> <span class="keyword">override</span> <span class="keywordtype">void</span> Reset()</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>  base.Reset();</div> |
| <div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  curTermBuffer = null;</div> |
| <div class="line"><a name="l00187"></a><span class="lineno"> 187</span>  }</div> |
| <div class="line"><a name="l00188"></a><span class="lineno"> 188</span>  }</div> |
| <div class="line"><a name="l00189"></a><span class="lineno"> 189</span> }</div> |
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