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| <a href="_snowball_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> Lucene.Net.Analysis.Tokenattributes;</div> |
| <div class="line"><a name="l00020"></a><span class="lineno"><a class="code" href="_snowball_filter_8cs.html#a6f0cf8ca71e14fbb50a33080d0492fff"> 20</a></span> <span class="keyword">using</span> <a class="code" href="_snowball_filter_8cs.html#a6f0cf8ca71e14fbb50a33080d0492fff">Token</a> = Lucene.Net.Analysis.Token;</div> |
| <div class="line"><a name="l00021"></a><span class="lineno"><a class="code" href="_snowball_filter_8cs.html#ae1a8cc06b3df9874eaf69944fecd2044"> 21</a></span> <span class="keyword">using</span> <a class="code" href="_snowball_filter_8cs.html#ae1a8cc06b3df9874eaf69944fecd2044">TokenFilter</a> = Lucene.Net.Analysis.TokenFilter;</div> |
| <div class="line"><a name="l00022"></a><span class="lineno"><a class="code" href="_snowball_filter_8cs.html#a205730fc8c2839cf92051d131140dae0"> 22</a></span> <span class="keyword">using</span> <a class="code" href="_more_like_this_8cs.html#a205730fc8c2839cf92051d131140dae0">TokenStream</a> = Lucene.Net.Analysis.TokenStream;</div> |
| <div class="line"><a name="l00023"></a><span class="lineno"><a class="code" href="_snowball_filter_8cs.html#a0f61d1cfa4fce74bd70af4ad8248f121"> 23</a></span> <span class="keyword">using</span> <a class="code" href="_snowball_filter_8cs.html#a0f61d1cfa4fce74bd70af4ad8248f121">SnowballProgram</a> = SF.Snowball.SnowballProgram;</div> |
| <div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="keyword">using</span> SF.Snowball.Ext;</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> <span class="keyword">namespace </span>Lucene.Net.Analysis.Snowball</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>  </div> |
| <div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  </div> |
| <div class="line"><a name="l00036"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_snowball_1_1_snowball_filter.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_analysis_1_1_snowball_1_1_snowball_filter.html" title="A filter that stems words using a Snowball-generated stemmer.">SnowballFilter</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="l00037"></a><span class="lineno"> 37</span>  {</div> |
| <div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  <span class="keyword">private</span> <span class="keyword">static</span> readonly System.Object[] EMPTY_ARGS = <span class="keyword">new</span> System.Object[0];</div> |
| <div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  </div> |
| <div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  <span class="keyword">private</span> <a class="code" href="_snowball_filter_8cs.html#a0f61d1cfa4fce74bd70af4ad8248f121">SnowballProgram</a> stemmer;</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="comment">//private System.Reflection.MethodInfo stemMethod;</span></div> |
| <div class="line"><a name="l00043"></a><span class="lineno"> 43</span> </div> |
| <div class="line"><a name="l00044"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_snowball_1_1_snowball_filter.html#a5f9afd69682789dfaff9d71930b20e86"> 44</a></span>  <span class="keyword">public</span> <a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_snowball_1_1_snowball_filter.html" title="A filter that stems words using a Snowball-generated stemmer.">SnowballFilter</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="_snowball_filter_8cs.html#a0f61d1cfa4fce74bd70af4ad8248f121">SnowballProgram</a> stemmer)</div> |
| <div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  : base(input)</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>  this.stemmer = stemmer;</div> |
| <div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  termAtt = AddAttribute<ITermAttribute>();</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="l00058"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_snowball_1_1_snowball_filter.html#a7bef8e9f0469bb1948a9f54f70fd6c31"> 58</a></span>  <span class="keyword">public</span> <a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_snowball_1_1_snowball_filter.html" title="A filter that stems words using a Snowball-generated stemmer.">SnowballFilter</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, System.String name) : base(input)</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>  <span class="keywordflow">try</span></div> |
| <div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  {</div> |
| <div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  System.Type stemClass = System.Type.GetType(<span class="stringliteral">"SF.Snowball.Ext."</span> + name + <span class="stringliteral">"Stemmer"</span>);</div> |
| <div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  stemmer = (<a class="code" href="_snowball_filter_8cs.html#a0f61d1cfa4fce74bd70af4ad8248f121">SnowballProgram</a>) System.Activator.CreateInstance(stemClass);</div> |
| <div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  }</div> |
| <div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  <span class="keywordflow">catch</span> (System.Exception e)</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>  <span class="keywordflow">throw</span> <span class="keyword">new</span> System.SystemException(e.ToString());</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>  termAtt = AddAttribute<ITermAttribute>();</div> |
| <div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  }</div> |
| <div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  </div> |
| <div class="line"><a name="l00073"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_snowball_1_1_snowball_filter.html#a028ef6fc9eaa37db47b8489215db600a"> 73</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="l00074"></a><span class="lineno"> 74</span>  {</div> |
| <div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  <span class="keywordflow">if</span> (input.IncrementToken())</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>  String originalTerm = termAtt.Term;</div> |
| <div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  stemmer.SetCurrent(originalTerm);</div> |
| <div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  stemmer.Stem();</div> |
| <div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  String finalTerm = stemmer.GetCurrent();</div> |
| <div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  <span class="comment">// Don't bother updating, if it is unchanged.</span></div> |
| <div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  <span class="keywordflow">if</span> (!originalTerm.Equals(finalTerm))</div> |
| <div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  termAtt.SetTermBuffer(finalTerm);</div> |
| <div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  <span class="keywordflow">return</span> <span class="keyword">true</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="keywordflow">else</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="keywordflow">return</span> <span class="keyword">false</span>;</div> |
| <div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  }</div> |
| <div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  }</div> |
| <div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  }</div> |
| <div class="line"><a name="l00092"></a><span class="lineno"> 92</span> }</div> |
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