Package org.apache.lucene.analysis.cjk

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.

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

Class Summary

Class	Description
CJKAnalyzer	An Analyzer that tokenizes text with StandardTokenizer, normalizes content with CJKWidthFilter, folds case with LowerCaseFilter, forms bigrams of CJK with CJKBigramFilter, and filters stopwords with StopFilter
CJKBigramFilter	Forms bigrams of CJK terms that are generated from StandardTokenizer or ICUTokenizer.
CJKBigramFilterFactory	Factory for CJKBigramFilter.
CJKTokenizer	Deprecated. Use StandardTokenizer, CJKWidthFilter, CJKBigramFilter, and LowerCaseFilter instead.
CJKTokenizerFactory	Deprecated. Use CJKBigramFilterFactory instead.
CJKWidthFilter	A TokenFilter that normalizes CJK width differences: Folds fullwidth ASCII variants into the equivalent basic latin Folds halfwidth Katakana variants into the equivalent kana
CJKWidthFilterFactory	Factory for CJKWidthFilter.