org.apache.lucene.analysis.ja
Class JapaneseKatakanaStemFilter
java.lang.Object
org.apache.lucene.util.AttributeSource
org.apache.lucene.analysis.TokenStream
org.apache.lucene.analysis.TokenFilter
org.apache.lucene.analysis.ja.JapaneseKatakanaStemFilter
- All Implemented Interfaces:
- Closeable
public final class JapaneseKatakanaStemFilter
- extends TokenFilter
A TokenFilter
that normalizes common katakana spelling variations
ending in a long sound character by removing this character (U+30FC). Only
katakana words longer than a minimum length are stemmed (default is four).
Note that only full-width katakana characters are supported. Please use a
CJKWidthFilter
to convert half-width
katakana to full-width before using this filter.
In order to prevent terms from being stemmed, use an instance of
KeywordMarkerFilter
or a custom TokenFilter
that sets the KeywordAttribute
before this TokenStream
.
Methods inherited from class org.apache.lucene.util.AttributeSource |
addAttribute, addAttributeImpl, captureState, clearAttributes, cloneAttributes, copyTo, equals, getAttribute, getAttributeClassesIterator, getAttributeFactory, getAttributeImplsIterator, hasAttribute, hasAttributes, hashCode, reflectAsString, reflectWith, restoreState |
DEFAULT_MINIMUM_LENGTH
public static final int DEFAULT_MINIMUM_LENGTH
- See Also:
- Constant Field Values
JapaneseKatakanaStemFilter
public JapaneseKatakanaStemFilter(TokenStream input,
int minimumLength)
JapaneseKatakanaStemFilter
public JapaneseKatakanaStemFilter(TokenStream input)
incrementToken
public boolean incrementToken()
throws IOException
- Specified by:
incrementToken
in class TokenStream
- Throws:
IOException
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