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| <div class="title">EdgeNGramTokenizer.cs</div> </div> |
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| <a href="_edge_n_gram_tokenizer_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.IO;</div> |
| <div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="keyword">using</span> System.Collections;</div> |
| <div class="line"><a name="l00020"></a><span class="lineno"> 20</span> </div> |
| <div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="keyword">using</span> Lucene.Net.Analysis;</div> |
| <div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="keyword">using</span> Lucene.Net.Analysis.Tokenattributes;</div> |
| <div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="keyword">using</span> Lucene.Net.Util;</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> <span class="keyword">namespace </span>Lucene.Net.Analysis.NGram</div> |
| <div class="line"><a name="l00026"></a><span class="lineno"> 26</span> {</div> |
| <div class="line"><a name="l00027"></a><span class="lineno"> 27</span> </div> |
| <div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  <span class="comment">/*</span></div> |
| <div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="comment"> * Tokenizes the input from an edge into n-grams of given size(s).</span></div> |
| <div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="comment"> * <p></span></div> |
| <div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="comment"> * This <see cref="Tokenizer"/> create n-grams from the beginning edge or ending edge of a input token.</span></div> |
| <div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="comment"> * MaxGram can't be larger than 1024 because of limitation.</span></div> |
| <div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="comment"> * </p></span></div> |
| <div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="comment"> */</span></div> |
| <div class="line"><a name="l00035"></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_tokenizer.html"> 35</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_tokenizer.html">EdgeNGramTokenizer</a> : <a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_tokenizer.html" title="A Tokenizer is a TokenStream whose input is a Reader. This is an abstract class; subclasses must over...">Tokenizer</a></div> |
| <div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  {</div> |
| <div class="line"><a name="l00037"></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_tokenizer.html#a3b67df484c5ff362236b76896ba1a991"> 37</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="l00038"></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_tokenizer.html#a99226dc1cead5656fc559e664db18476"> 38</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="l00039"></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_tokenizer.html#a62de9dbbc91a11583903b3990c0e7d86"> 39</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="l00040"></a><span class="lineno"> 40</span> </div> |
| <div class="line"><a name="l00041"></a><span class="lineno"> 41</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="l00042"></a><span class="lineno"> 42</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="l00043"></a><span class="lineno"> 43</span> </div> |
| <div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  <span class="comment">/* Specifies which side of the input the n-gram should be generated from */</span></div> |
| <div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  <span class="comment">// Moved Side enum from this class to external definition</span></div> |
| <div class="line"><a name="l00046"></a><span class="lineno"> 46</span> </div> |
| <div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  <span class="keyword">private</span> <span class="keywordtype">int</span> minGram;</div> |
| <div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  <span class="keyword">private</span> <span class="keywordtype">int</span> maxGram;</div> |
| <div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  <span class="keyword">private</span> <span class="keywordtype">int</span> gramSize;</div> |
| <div class="line"><a name="l00050"></a><span class="lineno"> 50</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="l00051"></a><span class="lineno"> 51</span>  <span class="keyword">private</span> <span class="keywordtype">bool</span> started = <span class="keyword">false</span>;</div> |
| <div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  <span class="keyword">private</span> <span class="keywordtype">int</span> inLen;</div> |
| <div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <span class="keyword">private</span> <span class="keywordtype">string</span> inStr;</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> </div> |
| <div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  <span class="comment">/*</span></div> |
| <div class="line"><a name="l00057"></a><span class="lineno"> 57</span> <span class="comment"> * Creates EdgeNGramTokenizer that can generate n-grams in the sizes of the given range</span></div> |
| <div class="line"><a name="l00058"></a><span class="lineno"> 58</span> <span class="comment"> *</span></div> |
| <div class="line"><a name="l00059"></a><span class="lineno"> 59</span> <span class="comment"> * <param name="input"><see cref="TextReader"/> holding the input to be tokenized</param></span></div> |
| <div class="line"><a name="l00060"></a><span class="lineno"> 60</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="l00061"></a><span class="lineno"> 61</span> <span class="comment"> * <param name="minGram">the smallest n-gram to generate</param></span></div> |
| <div class="line"><a name="l00062"></a><span class="lineno"> 62</span> <span class="comment"> * <param name="maxGram">the largest n-gram to generate</param></span></div> |
| <div class="line"><a name="l00063"></a><span class="lineno"> 63</span> <span class="comment"> */</span></div> |
| <div class="line"><a name="l00064"></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_tokenizer.html#aa4ba03e730eb30f3dcb3693c78520b8e"> 64</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_tokenizer.html">EdgeNGramTokenizer</a>(TextReader 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="l00065"></a><span class="lineno"> 65</span>  : base(input)</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>  init(side, minGram, maxGram);</div> |
| <div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  }</div> |
| <div class="line"><a name="l00069"></a><span class="lineno"> 69</span> </div> |
| <div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  <span class="comment">/*</span></div> |
| <div class="line"><a name="l00071"></a><span class="lineno"> 71</span> <span class="comment"> * Creates EdgeNGramTokenizer that can generate n-grams in the sizes of the given range</span></div> |
| <div class="line"><a name="l00072"></a><span class="lineno"> 72</span> <span class="comment"> *</span></div> |
| <div class="line"><a name="l00073"></a><span class="lineno"> 73</span> <span class="comment"> * <param name="source"><see cref="AttributeSource"/> to use</param></span></div> |
| <div class="line"><a name="l00074"></a><span class="lineno"> 74</span> <span class="comment"> * <param name="input"><see cref="TextReader"/> holding the input to be tokenized</param></span></div> |
| <div class="line"><a name="l00075"></a><span class="lineno"> 75</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="l00076"></a><span class="lineno"> 76</span> <span class="comment"> * <param name="minGram">the smallest n-gram to generate</param></span></div> |
| <div class="line"><a name="l00077"></a><span class="lineno"> 77</span> <span class="comment"> * <param name="maxGram">the largest n-gram to generate</param></span></div> |
| <div class="line"><a name="l00078"></a><span class="lineno"> 78</span> <span class="comment"> */</span></div> |
| <div class="line"><a name="l00079"></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_tokenizer.html#a9fe656cb4e9da33635cbcafa0a8b8464"> 79</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_tokenizer.html">EdgeNGramTokenizer</a>(<a class="code" href="class_lucene_1_1_net_1_1_util_1_1_attribute_source.html" title="An AttributeSource contains a list of different Attributes, and methods to add and get them...">AttributeSource</a> source, TextReader 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="l00080"></a><span class="lineno"> 80</span>  : base(source, input)</div> |
| <div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  {</div> |
| <div class="line"><a name="l00082"></a><span class="lineno"> 82</span> </div> |
| <div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  init(side, minGram, maxGram);</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> </div> |
| <div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  <span class="comment">/*</span></div> |
| <div class="line"><a name="l00087"></a><span class="lineno"> 87</span> <span class="comment"> * Creates EdgeNGramTokenizer that can generate n-grams in the sizes of the given range</span></div> |
| <div class="line"><a name="l00088"></a><span class="lineno"> 88</span> <span class="comment"> * </span></div> |
| <div class="line"><a name="l00089"></a><span class="lineno"> 89</span> <span class="comment"> * <param name="factory"><see cref="AttributeSource.AttributeFactory"/> to use</param></span></div> |
| <div class="line"><a name="l00090"></a><span class="lineno"> 90</span> <span class="comment"> * <param name="input"><see cref="TextReader"/> holding the input to be tokenized</param></span></div> |
| <div class="line"><a name="l00091"></a><span class="lineno"> 91</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="l00092"></a><span class="lineno"> 92</span> <span class="comment"> * <param name="minGram">the smallest n-gram to generate</param></span></div> |
| <div class="line"><a name="l00093"></a><span class="lineno"> 93</span> <span class="comment"> * <param name="maxGram">the largest n-gram to generate</param></span></div> |
| <div class="line"><a name="l00094"></a><span class="lineno"> 94</span> <span class="comment"> */</span></div> |
| <div class="line"><a name="l00095"></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_tokenizer.html#a87a55c44589eabfe59c672b55b03911f"> 95</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_tokenizer.html">EdgeNGramTokenizer</a>(<a class="code" href="class_lucene_1_1_net_1_1_util_1_1_attribute_source_1_1_attribute_factory.html" title="An AttributeFactory creates instances of Attributes.">AttributeFactory</a> factory, TextReader 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="l00096"></a><span class="lineno"> 96</span>  : base(factory, input)</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> </div> |
| <div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  init(side, minGram, maxGram);</div> |
| <div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  }</div> |
| <div class="line"><a name="l00101"></a><span class="lineno"> 101</span> </div> |
| <div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  <span class="comment">/*</span></div> |
| <div class="line"><a name="l00103"></a><span class="lineno"> 103</span> <span class="comment"> * Creates EdgeNGramTokenizer that can generate n-grams in the sizes of the given range</span></div> |
| <div class="line"><a name="l00104"></a><span class="lineno"> 104</span> <span class="comment"> *</span></div> |
| <div class="line"><a name="l00105"></a><span class="lineno"> 105</span> <span class="comment"> * <param name="input"><see cref="TextReader"/> holding the input to be tokenized</param></span></div> |
| <div class="line"><a name="l00106"></a><span class="lineno"> 106</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="l00107"></a><span class="lineno"> 107</span> <span class="comment"> * <param name="minGram">the smallest n-gram to generate</param></span></div> |
| <div class="line"><a name="l00108"></a><span class="lineno"> 108</span> <span class="comment"> * <param name="maxGram">the largest n-gram to generate</param></span></div> |
| <div class="line"><a name="l00109"></a><span class="lineno"> 109</span> <span class="comment"> */</span></div> |
| <div class="line"><a name="l00110"></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_tokenizer.html#aa14fb6a14c50cfb16e3c63c937d4941a"> 110</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_tokenizer.html">EdgeNGramTokenizer</a>(TextReader 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="l00111"></a><span class="lineno"> 111</span>  : this(input, SideExtensions.GetSide(sideLabel), minGram, maxGram)</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> </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="comment">/*</span></div> |
| <div class="line"><a name="l00117"></a><span class="lineno"> 117</span> <span class="comment"> * Creates EdgeNGramTokenizer that can generate n-grams in the sizes of the given range</span></div> |
| <div class="line"><a name="l00118"></a><span class="lineno"> 118</span> <span class="comment"> *</span></div> |
| <div class="line"><a name="l00119"></a><span class="lineno"> 119</span> <span class="comment"> * <param name="source"><see cref="AttributeSource"/> to use</param></span></div> |
| <div class="line"><a name="l00120"></a><span class="lineno"> 120</span> <span class="comment"> * <param name="input"><see cref="TextReader"/> holding the input to be tokenized</param></span></div> |
| <div class="line"><a name="l00121"></a><span class="lineno"> 121</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="l00122"></a><span class="lineno"> 122</span> <span class="comment"> * <param name="minGram">the smallest n-gram to generate</param></span></div> |
| <div class="line"><a name="l00123"></a><span class="lineno"> 123</span> <span class="comment"> * <param name="maxGram">the largest n-gram to generate</param></span></div> |
| <div class="line"><a name="l00124"></a><span class="lineno"> 124</span> <span class="comment"> */</span></div> |
| <div class="line"><a name="l00125"></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_tokenizer.html#acf622fa449e792c063489e274b35ce82"> 125</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_tokenizer.html">EdgeNGramTokenizer</a>(<a class="code" href="class_lucene_1_1_net_1_1_util_1_1_attribute_source.html" title="An AttributeSource contains a list of different Attributes, and methods to add and get them...">AttributeSource</a> source, TextReader 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="l00126"></a><span class="lineno"> 126</span>  : this(source, input, SideExtensions.GetSide(sideLabel), minGram, maxGram)</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="l00129"></a><span class="lineno"> 129</span>  }</div> |
| <div class="line"><a name="l00130"></a><span class="lineno"> 130</span> </div> |
| <div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  <span class="comment">/*</span></div> |
| <div class="line"><a name="l00132"></a><span class="lineno"> 132</span> <span class="comment"> * Creates EdgeNGramTokenizer that can generate n-grams in the sizes of the given range</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"> * <param name="factory"><see cref="AttributeSource.AttributeFactory"/> to use</param></span></div> |
| <div class="line"><a name="l00135"></a><span class="lineno"> 135</span> <span class="comment"> * <param name="input"><see cref="TextReader"/> holding the input to be tokenized</param></span></div> |
| <div class="line"><a name="l00136"></a><span class="lineno"> 136</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="l00137"></a><span class="lineno"> 137</span> <span class="comment"> * <param name="minGram">the smallest n-gram to generate</param></span></div> |
| <div class="line"><a name="l00138"></a><span class="lineno"> 138</span> <span class="comment"> * <param name="maxGram">the largest n-gram to generate</param></span></div> |
| <div class="line"><a name="l00139"></a><span class="lineno"> 139</span> <span class="comment"> */</span></div> |
| <div class="line"><a name="l00140"></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_tokenizer.html#ab9979c76e9ba1d06b8ad92fb0a582db4"> 140</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_tokenizer.html">EdgeNGramTokenizer</a>(<a class="code" href="class_lucene_1_1_net_1_1_util_1_1_attribute_source_1_1_attribute_factory.html" title="An AttributeFactory creates instances of Attributes.">AttributeFactory</a> factory, TextReader 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="l00141"></a><span class="lineno"> 141</span>  this(factory, input, SideExtensions.GetSide(sideLabel), minGram, maxGram)</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> |
| <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>  <span class="keyword">private</span> <span class="keywordtype">void</span> init(<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="l00146"></a><span class="lineno"> 146</span>  {</div> |
| <div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  <span class="keywordflow">if</span> (side == null)</div> |
| <div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  {</div> |
| <div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  <span class="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="l00150"></a><span class="lineno"> 150</span>  }</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> (minGram < 1)</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">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="l00155"></a><span class="lineno"> 155</span>  }</div> |
| <div class="line"><a name="l00156"></a><span class="lineno"> 156</span> </div> |
| <div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  <span class="keywordflow">if</span> (minGram > maxGram)</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>  <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="l00160"></a><span class="lineno"> 160</span>  }</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>  this.minGram = minGram;</div> |
| <div class="line"><a name="l00163"></a><span class="lineno"> 163</span>  this.maxGram = maxGram;</div> |
| <div class="line"><a name="l00164"></a><span class="lineno"> 164</span>  this.side = side;</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>  this.termAtt = AddAttribute<ITermAttribute>();</div> |
| <div class="line"><a name="l00167"></a><span class="lineno"> 167</span>  this.offsetAtt = AddAttribute<IOffsetAttribute>();</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>  }</div> |
| <div class="line"><a name="l00170"></a><span class="lineno"> 170</span> </div> |
| <div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  <span class="comment">/* Returns the next token in the stream, or null at EOS. */</span></div> |
| <div class="line"><a name="l00172"></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_tokenizer.html#aa33076183273e64f655372b62cf55928"> 172</a></span>  <span class="keyword">public</span> <span class="keyword">override</span> <span class="keywordtype">bool</span> IncrementToken()</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>  ClearAttributes();</div> |
| <div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  <span class="comment">// if we are just starting, read the whole input</span></div> |
| <div class="line"><a name="l00176"></a><span class="lineno"> 176</span>  <span class="keywordflow">if</span> (!started)</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>  started = <span class="keyword">true</span>;</div> |
| <div class="line"><a name="l00179"></a><span class="lineno"> 179</span>  <span class="keywordtype">char</span>[] chars = <span class="keyword">new</span> <span class="keywordtype">char</span>[1024];</div> |
| <div class="line"><a name="l00180"></a><span class="lineno"> 180</span>  inStr = input.ReadToEnd().Trim(); <span class="comment">// remove any leading or trailing spaces</span></div> |
| <div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  inLen = inStr.Length;</div> |
| <div class="line"><a name="l00182"></a><span class="lineno"> 182</span>  gramSize = minGram;</div> |
| <div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  }</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>  <span class="comment">// if the remaining input is too short, we can't generate any n-grams</span></div> |
| <div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  <span class="keywordflow">if</span> (gramSize > inLen)</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>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</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> </div> |
| <div class="line"><a name="l00191"></a><span class="lineno"> 191</span>  <span class="comment">// if we have hit the end of our n-gram size range, quit</span></div> |
| <div class="line"><a name="l00192"></a><span class="lineno"> 192</span>  <span class="keywordflow">if</span> (gramSize > maxGram)</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>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div> |
| <div class="line"><a name="l00195"></a><span class="lineno"> 195</span>  }</div> |
| <div class="line"><a name="l00196"></a><span class="lineno"> 196</span> </div> |
| <div class="line"><a name="l00197"></a><span class="lineno"> 197</span>  <span class="comment">// grab gramSize chars from front or back</span></div> |
| <div class="line"><a name="l00198"></a><span class="lineno"> 198</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 : inLen - gramSize;</div> |
| <div class="line"><a name="l00199"></a><span class="lineno"> 199</span>  <span class="keywordtype">int</span> end = start + gramSize;</div> |
| <div class="line"><a name="l00200"></a><span class="lineno"> 200</span>  termAtt.SetTermBuffer(inStr, start, gramSize);</div> |
| <div class="line"><a name="l00201"></a><span class="lineno"> 201</span>  offsetAtt.SetOffset(CorrectOffset(start), CorrectOffset(end));</div> |
| <div class="line"><a name="l00202"></a><span class="lineno"> 202</span>  gramSize++;</div> |
| <div class="line"><a name="l00203"></a><span class="lineno"> 203</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div> |
| <div class="line"><a name="l00204"></a><span class="lineno"> 204</span>  }</div> |
| <div class="line"><a name="l00205"></a><span class="lineno"> 205</span> </div> |
| <div class="line"><a name="l00206"></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_tokenizer.html#ad004fc75f64abc17bcc394bd2c92766a"> 206</a></span>  <span class="keyword">public</span> <span class="keyword">override</span> <span class="keywordtype">void</span> End()</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>  <span class="comment">// set offset</span></div> |
| <div class="line"><a name="l00209"></a><span class="lineno"> 209</span>  <span class="keywordtype">int</span> finalOffset = inLen;</div> |
| <div class="line"><a name="l00210"></a><span class="lineno"> 210</span>  this.offsetAtt.SetOffset(finalOffset, finalOffset);</div> |
| <div class="line"><a name="l00211"></a><span class="lineno"> 211</span>  }</div> |
| <div class="line"><a name="l00212"></a><span class="lineno"> 212</span> </div> |
| <div class="line"><a name="l00213"></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_tokenizer.html#a7154d555468128553984710cd7e31beb"> 213</a></span>  <span class="keyword">public</span> <span class="keyword">override</span> <span class="keywordtype">void</span> Reset(TextReader input)</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>  base.Reset(input);</div> |
| <div class="line"><a name="l00216"></a><span class="lineno"> 216</span>  Reset();</div> |
| <div class="line"><a name="l00217"></a><span class="lineno"> 217</span>  }</div> |
| <div class="line"><a name="l00218"></a><span class="lineno"> 218</span> </div> |
| <div class="line"><a name="l00219"></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_tokenizer.html#acb2c47c8d4892775826c97b4ea32d0a5"> 219</a></span>  <span class="keyword">public</span> <span class="keyword">override</span> <span class="keywordtype">void</span> Reset()</div> |
| <div class="line"><a name="l00220"></a><span class="lineno"> 220</span>  {</div> |
| <div class="line"><a name="l00221"></a><span class="lineno"> 221</span>  base.Reset();</div> |
| <div class="line"><a name="l00222"></a><span class="lineno"> 222</span>  started = <span class="keyword">false</span>;</div> |
| <div class="line"><a name="l00223"></a><span class="lineno"> 223</span>  }</div> |
| <div class="line"><a name="l00224"></a><span class="lineno"> 224</span>  }</div> |
| <div class="line"><a name="l00225"></a><span class="lineno"> 225</span> }</div> |
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