Class SmartChineseAnalyzer
- java.lang.Object
-
- org.apache.lucene.analysis.Analyzer
-
- org.apache.lucene.analysis.cn.smart.SmartChineseAnalyzer
-
- All Implemented Interfaces:
Closeable
,AutoCloseable
public final class SmartChineseAnalyzer extends Analyzer
SmartChineseAnalyzer is an analyzer for Chinese or mixed Chinese-English text. The analyzer uses probabilistic knowledge to find the optimal word segmentation for Simplified Chinese text. The text is first broken into sentences, then each sentence is segmented into words.Segmentation is based upon the Hidden Markov Model. A large training corpus was used to calculate Chinese word frequency probability.
This analyzer requires a dictionary to provide statistical data. SmartChineseAnalyzer has an included dictionary out-of-box.
The included dictionary data is from ICTCLAS1.0. Thanks to ICTCLAS for their hard work, and for contributing the data under the Apache 2 License!
- Since:
- 3.1
- WARNING: This API is experimental and might change in incompatible ways in the next release.
-
-
Nested Class Summary
-
Nested classes/interfaces inherited from class org.apache.lucene.analysis.Analyzer
Analyzer.ReuseStrategy, Analyzer.TokenStreamComponents
-
-
Field Summary
-
Fields inherited from class org.apache.lucene.analysis.Analyzer
GLOBAL_REUSE_STRATEGY, PER_FIELD_REUSE_STRATEGY
-
-
Constructor Summary
Constructors Constructor Description SmartChineseAnalyzer()
Create a new SmartChineseAnalyzer, using the default stopword list.SmartChineseAnalyzer(boolean useDefaultStopWords)
Create a new SmartChineseAnalyzer, optionally using the default stopword list.SmartChineseAnalyzer(CharArraySet stopWords)
Create a new SmartChineseAnalyzer, using the providedSet
of stopwords.
-
Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description Analyzer.TokenStreamComponents
createComponents(String fieldName)
static CharArraySet
getDefaultStopSet()
Returns an unmodifiable instance of the default stop-words set.protected TokenStream
normalize(String fieldName, TokenStream in)
-
Methods inherited from class org.apache.lucene.analysis.Analyzer
attributeFactory, close, getOffsetGap, getPositionIncrementGap, getReuseStrategy, initReader, initReaderForNormalization, normalize, tokenStream, tokenStream
-
-
-
-
Constructor Detail
-
SmartChineseAnalyzer
public SmartChineseAnalyzer()
Create a new SmartChineseAnalyzer, using the default stopword list.
-
SmartChineseAnalyzer
public SmartChineseAnalyzer(boolean useDefaultStopWords)
Create a new SmartChineseAnalyzer, optionally using the default stopword list.The included default stopword list is simply a list of punctuation. If you do not use this list, punctuation will not be removed from the text!
- Parameters:
useDefaultStopWords
- true to use the default stopword list.
-
SmartChineseAnalyzer
public SmartChineseAnalyzer(CharArraySet stopWords)
Create a new SmartChineseAnalyzer, using the providedSet
of stopwords.Note: the set should include punctuation, unless you want to index punctuation!
- Parameters:
stopWords
-Set
of stopwords to use.
-
-
Method Detail
-
getDefaultStopSet
public static CharArraySet getDefaultStopSet()
Returns an unmodifiable instance of the default stop-words set.- Returns:
- an unmodifiable instance of the default stop-words set.
-
createComponents
public Analyzer.TokenStreamComponents createComponents(String fieldName)
- Specified by:
createComponents
in classAnalyzer
-
normalize
protected TokenStream normalize(String fieldName, TokenStream in)
-
-