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| <h1 id="Lucene_Net_Analysis_Cjk" data-uid="Lucene.Net.Analysis.Cjk" class="text-break">Namespace Lucene.Net.Analysis.Cjk |
| </h1> |
| <div class="markdown level0 summary"><!-- |
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| <p>Analyzer for Chinese, Japanese, and Korean, which indexes bigrams. |
| This analyzer generates bigram terms, which are overlapping groups of two adjacent Han, Hiragana, Katakana, or Hangul characters.</p> |
| <p> Three analyzers are provided for Chinese, each of which treats Chinese text in a different way. * ChineseAnalyzer (in the analyzers/cn package): Index unigrams (individual Chinese characters) as a token. * CJKAnalyzer (in this package): Index bigrams (overlapping groups of two adjacent Chinese characters) as tokens. * SmartChineseAnalyzer (in the analyzers/smartcn package): Index words (attempt to segment Chinese text into words) as tokens. Example phrase: "我是中国人" 1. ChineseAnalyzer: 我-是-中-国-人 2. CJKAnalyzer: 我是-是中-中国-国人 3. SmartChineseAnalyzer: 我-是-中国-人 </p> |
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| <h3 id="classes">Classes |
| </h3> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Cjk.CJKAnalyzer.html">CJKAnalyzer</a></h4> |
| <section><p>An <span class="xref">Lucene.Net.Analysis.Analyzer</span> that tokenizes text with <a class="xref" href="Lucene.Net.Analysis.Standard.StandardTokenizer.html">StandardTokenizer</a>, |
| normalizes content with <a class="xref" href="Lucene.Net.Analysis.Cjk.CJKWidthFilter.html">CJKWidthFilter</a>, folds case with |
| <a class="xref" href="Lucene.Net.Analysis.Core.LowerCaseFilter.html">LowerCaseFilter</a>, forms bigrams of CJK with <a class="xref" href="Lucene.Net.Analysis.Cjk.CJKBigramFilter.html">CJKBigramFilter</a>, |
| and filters stopwords with <a class="xref" href="Lucene.Net.Analysis.Core.StopFilter.html">StopFilter</a></p> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Cjk.CJKBigramFilter.html">CJKBigramFilter</a></h4> |
| <section><p>Forms bigrams of CJK terms that are generated from <a class="xref" href="Lucene.Net.Analysis.Standard.StandardTokenizer.html">StandardTokenizer</a> |
| or ICUTokenizer. |
| <p> |
| CJK types are set by these tokenizers, but you can also use |
| <a class="xref" href="Lucene.Net.Analysis.Cjk.CJKBigramFilter.html#Lucene_Net_Analysis_Cjk_CJKBigramFilter__ctor_Lucene_Net_Analysis_TokenStream_Lucene_Net_Analysis_Cjk_CJKScript_">CJKBigramFilter(TokenStream, CJKScript)</a> to explicitly control which |
| of the CJK scripts are turned into bigrams. |
| </p> |
| <p> |
| By default, when a CJK character has no adjacent characters to form |
| a bigram, it is output in unigram form. If you want to always output |
| both unigrams and bigrams, set the <pre><code>outputUnigrams</code></pre> |
| flag in <a class="xref" href="Lucene.Net.Analysis.Cjk.CJKBigramFilter.html#Lucene_Net_Analysis_Cjk_CJKBigramFilter__ctor_Lucene_Net_Analysis_TokenStream_Lucene_Net_Analysis_Cjk_CJKScript_System_Boolean_">CJKBigramFilter(TokenStream, CJKScript, Boolean)</a>. |
| This can be used for a combined unigram+bigram approach. |
| </p> |
| <p> |
| In all cases, all non-CJK input is passed thru unmodified. |
| </p></p> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Cjk.CJKBigramFilterFactory.html">CJKBigramFilterFactory</a></h4> |
| <section><p>Factory for <a class="xref" href="Lucene.Net.Analysis.Cjk.CJKBigramFilter.html">CJKBigramFilter</a>.</p> |
| <pre><code><fieldType name="text_cjk" class="solr.TextField"> |
| <analyzer> |
| <tokenizer class="solr.StandardTokenizerFactory"/> |
| <filter class="solr.CJKWidthFilterFactory"/> |
| <filter class="solr.LowerCaseFilterFactory"/> |
| <filter class="solr.CJKBigramFilterFactory" |
| han="true" hiragana="true" |
| katakana="true" hangul="true" outputUnigrams="false" /> |
| </analyzer> |
| </fieldType></code></pre> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Cjk.CJKTokenizer.html">CJKTokenizer</a></h4> |
| <section><p>CJKTokenizer is designed for Chinese, Japanese, and Korean languages. |
| <p><br>The tokens returned are every two adjacent characters with overlap match. |
| </p> |
| <p> |
| Example: "java C1C2C3C4" will be segmented to: "java" "C1C2" "C2C3" "C3C4". |
| </p> |
| Additionally, the following is applied to Latin text (such as English): |
| <ul><li>Text is converted to lowercase.</li><li>Numeric digits, '+', '#', and '_' are tokenized as letters.</li><li>Full-width forms are converted to half-width forms.</li></ul> |
| For more info on Asian language (Chinese, Japanese, and Korean) text segmentation: |
| please search <a href="http://www.google.com/search?q=word+chinese+segment">google</a></p> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Cjk.CJKTokenizerFactory.html">CJKTokenizerFactory</a></h4> |
| <section><p>Factory for <a class="xref" href="Lucene.Net.Analysis.Cjk.CJKTokenizer.html">CJKTokenizer</a>. </p> |
| <pre><code><fieldType name="text_cjk" class="solr.TextField" positionIncrementGap="100"> |
| <analyzer> |
| <tokenizer class="solr.CJKTokenizerFactory"/> |
| </analyzer> |
| </fieldType></code></pre> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Cjk.CJKWidthFilter.html">CJKWidthFilter</a></h4> |
| <section><p>A <span class="xref">Lucene.Net.Analysis.TokenFilter</span> that normalizes CJK width differences: |
| <ul><li>Folds fullwidth ASCII variants into the equivalent basic latin</li><li>Folds halfwidth Katakana variants into the equivalent kana</li></ul> |
| <p> |
| NOTE: this filter can be viewed as a (practical) subset of NFKC/NFKD |
| Unicode normalization. See the normalization support in the ICU package |
| for full normalization. |
| </p></p> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Cjk.CJKWidthFilterFactory.html">CJKWidthFilterFactory</a></h4> |
| <section><p>Factory for <a class="xref" href="Lucene.Net.Analysis.Cjk.CJKWidthFilter.html">CJKWidthFilter</a>.</p> |
| <pre><code><fieldType name="text_cjk" class="solr.TextField"> |
| <analyzer> |
| <tokenizer class="solr.StandardTokenizerFactory"/> |
| <filter class="solr.CJKWidthFilterFactory"/> |
| <filter class="solr.LowerCaseFilterFactory"/> |
| <filter class="solr.CJKBigramFilterFactory"/> |
| </analyzer> |
| </fieldType></code></pre> |
| </section> |
| <h3 id="enums">Enums |
| </h3> |
| <h4><a class="xref" href="Lucene.Net.Analysis.Cjk.CJKScript.html">CJKScript</a></h4> |
| <section></section> |
| </article> |
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