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| <div class="title">ThaiWordFilter.cs</div> </div> |
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| <a href="_thai_word_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"> *</span></div> |
| <div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> * Licensed to the Apache Software Foundation (ASF) under one</span></div> |
| <div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> * or more contributor license agreements. See the NOTICE file</span></div> |
| <div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"> * distributed with this work for additional information</span></div> |
| <div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> * regarding copyright ownership. The ASF licenses this file</span></div> |
| <div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> * to you under the Apache License, Version 2.0 (the</span></div> |
| <div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> * "License"); you may not use this file except in compliance</span></div> |
| <div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"> * with the License. You may obtain a copy of the License at</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"> * http://www.apache.org/licenses/LICENSE-2.0</span></div> |
| <div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"> *</span></div> |
| <div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"> * Unless required by applicable law or agreed to in writing,</span></div> |
| <div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"> * software distributed under the License is distributed on an</span></div> |
| <div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"> * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY</span></div> |
| <div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> * KIND, either express or implied. See the License for the</span></div> |
| <div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"> * specific language governing permissions and limitations</span></div> |
| <div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment"> * under the License.</span></div> |
| <div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment"> *</span></div> |
| <div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment">*/</span></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> System;</div> |
| <div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="keyword">using</span> System.Collections.Generic;</div> |
| <div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="keyword">using</span> System.Linq;</div> |
| <div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="keyword">using</span> System.Text;</div> |
| <div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="keyword">using</span> System.Text.RegularExpressions;</div> |
| <div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="keyword">using</span> Lucene.Net.Analysis.Tokenattributes;</div> |
| <div class="line"><a name="l00028"></a><span class="lineno"> 28</span> </div> |
| <div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="keyword">namespace </span>Lucene.Net.Analysis.Th</div> |
| <div class="line"><a name="l00030"></a><span class="lineno"> 30</span> {</div> |
| <div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  <span class="comment">/*</span></div> |
| <div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="comment"> * {@link TokenFilter} that use {@link java.text.BreakIterator} to break each </span></div> |
| <div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="comment"> * Token that is Thai into separate Token(s) for each Thai word.</span></div> |
| <div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="comment"> * <p>WARNING: this filter may not work correctly with all JREs.</span></div> |
| <div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="comment"> * It is known to work with Sun/Oracle and Harmony JREs.</span></div> |
| <div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="comment"> */</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_th_1_1_thai_word_filter.html"> 37</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_th_1_1_thai_word_filter.html">ThaiWordFilter</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="l00038"></a><span class="lineno"> 38</span>  {</div> |
| <div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  <span class="comment">//private BreakIterator breaker = null;</span></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="keyword">private</span> State thaiState = null;</div> |
| <div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  <span class="comment">// I'm sure this is far slower than if we just created a simple UnicodeBlock class</span></div> |
| <div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  <span class="comment">// considering this is used on a single char, we have to create a new string for it,</span></div> |
| <div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  <span class="comment">// via ToString(), so we can then run a costly(?) regex on it. Yikes.</span></div> |
| <div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  <span class="keyword">private</span> Regex _isThaiRegex = <span class="keyword">new</span> Regex(<span class="stringliteral">@"\p{IsThai}"</span>, RegexOptions.Compiled);</div> |
| <div class="line"><a name="l00049"></a><span class="lineno"> 49</span> </div> |
| <div class="line"><a name="l00050"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_th_1_1_thai_word_filter.html#a52d1865dd984b5cd07cdf65e192f8dbb"> 50</a></span>  <span class="keyword">public</span> <a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_th_1_1_thai_word_filter.html">ThaiWordFilter</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)</div> |
| <div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  : base(input)</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>  <span class="keywordflow">throw</span> <span class="keyword">new</span> NotSupportedException(<span class="stringliteral">"PORT ISSUES"</span>);</div> |
| <div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  <span class="comment">//breaker = BreakIterator.getWordInstance(new Locale("th"));</span></div> |
| <div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  <span class="comment">//termAtt = AddAttribute<TermAttribute>();</span></div> |
| <div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  <span class="comment">//offsetAtt = AddAttribute<OffsetAttribute>();</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="l00059"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_th_1_1_thai_word_filter.html#af871b66494b580b7db812caef6fa7679"> 59</a></span>  <span class="keyword">public</span> sealed <span class="keyword">override</span> <span class="keywordtype">bool</span> IncrementToken()</div> |
| <div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  {</div> |
| <div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  <span class="comment">//int end;</span></div> |
| <div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  <span class="comment">//if (thaiState != null)</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"> 64</span>  <span class="comment">// int start = breaker.Current();</span></div> |
| <div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  <span class="comment">// end = breaker.next();</span></div> |
| <div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  <span class="comment">// if (end != BreakIterator.DONE)</span></div> |
| <div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  <span class="comment">// {</span></div> |
| <div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  <span class="comment">// RestoreState(thaiState);</span></div> |
| <div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  <span class="comment">// termAtt.SetTermBuffer(termAtt.TermBuffer(), start, end - start);</span></div> |
| <div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  <span class="comment">// offsetAtt.SetOffset(offsetAtt.StartOffset() + start, offsetAtt.StartOffset() + end);</span></div> |
| <div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  <span class="comment">// return true;</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">// thaiState = null;</span></div> |
| <div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  <span class="comment">//}</span></div> |
| <div class="line"><a name="l00075"></a><span class="lineno"> 75</span> </div> |
| <div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  <span class="comment">//if (input.IncrementToken() == false || termAtt.TermLength() == 0)</span></div> |
| <div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  <span class="comment">// return false;</span></div> |
| <div class="line"><a name="l00078"></a><span class="lineno"> 78</span> </div> |
| <div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  <span class="comment">//String text = termAtt.Term();</span></div> |
| <div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  <span class="comment">//if (!_isThaiRegex.Match(new string(new[]{text[0]})).Success)</span></div> |
| <div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  <span class="comment">//{</span></div> |
| <div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  <span class="comment">// termAtt.SetTermBuffer(text.ToLower());</span></div> |
| <div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  <span class="comment">// return true;</span></div> |
| <div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  <span class="comment">//}</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">//thaiState = CaptureState();</span></div> |
| <div class="line"><a name="l00087"></a><span class="lineno"> 87</span> </div> |
| <div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  <span class="comment">//breaker.SetText(text);</span></div> |
| <div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  <span class="comment">//end = breaker.next();</span></div> |
| <div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  <span class="comment">//if (end != BreakIterator.DONE)</span></div> |
| <div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  <span class="comment">//{</span></div> |
| <div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  <span class="comment">// termAtt.SetTermBuffer(text, 0, end);</span></div> |
| <div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  <span class="comment">// offsetAtt.SetOffset(offsetAtt.StartOffset(), offsetAtt.StartOffset() + end);</span></div> |
| <div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  <span class="comment">// return true;</span></div> |
| <div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  <span class="comment">//}</span></div> |
| <div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  <span class="keywordflow">return</span> <span class="keyword">false</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> </div> |
| <div class="line"><a name="l00099"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_th_1_1_thai_word_filter.html#aa85fd75d9479d9649acb4d5fef39469c"> 99</a></span>  <span class="keyword">public</span> <span class="keyword">override</span> <span class="keywordtype">void</span> Reset()</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>  base.Reset();</div> |
| <div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  thaiState = null;</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>  }</div> |
| <div class="line"><a name="l00105"></a><span class="lineno"> 105</span> }</div> |
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