Class JapaneseReadingFormFilter
- java.lang.Object
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- org.apache.lucene.util.AttributeSource
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- org.apache.lucene.analysis.TokenStream
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- org.apache.lucene.analysis.TokenFilter
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- org.apache.lucene.analysis.ja.JapaneseReadingFormFilter
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- All Implemented Interfaces:
java.io.Closeable
,java.lang.AutoCloseable
,Unwrappable<TokenStream>
public final class JapaneseReadingFormFilter extends TokenFilter
ATokenFilter
that replaces the term attribute with the reading of a token in either katakana or romaji form. The default reading form is katakana.
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Nested Class Summary
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Nested classes/interfaces inherited from class org.apache.lucene.util.AttributeSource
AttributeSource.State
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Field Summary
Fields Modifier and Type Field Description private java.lang.StringBuilder
buffer
private static char
HIRAGANA_END
private static char
HIRAGANA_START
private ReadingAttribute
readingAttr
private CharTermAttribute
termAttr
private boolean
useRomaji
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Fields inherited from class org.apache.lucene.analysis.TokenFilter
input
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Fields inherited from class org.apache.lucene.analysis.TokenStream
DEFAULT_TOKEN_ATTRIBUTE_FACTORY
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Constructor Summary
Constructors Constructor Description JapaneseReadingFormFilter(TokenStream input)
JapaneseReadingFormFilter(TokenStream input, boolean useRomaji)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description private boolean
containsHiragana(java.lang.CharSequence s)
boolean
incrementToken()
Consumers (i.e.,IndexWriter
) use this method to advance the stream to the next token.private boolean
isHiragana(char ch)
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Methods inherited from class org.apache.lucene.analysis.TokenFilter
close, end, reset, unwrap
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Methods inherited from class org.apache.lucene.util.AttributeSource
addAttribute, addAttributeImpl, captureState, clearAttributes, cloneAttributes, copyTo, endAttributes, equals, getAttribute, getAttributeClassesIterator, getAttributeFactory, getAttributeImplsIterator, hasAttribute, hasAttributes, hashCode, reflectAsString, reflectWith, removeAllAttributes, restoreState, toString
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Field Detail
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termAttr
private final CharTermAttribute termAttr
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readingAttr
private final ReadingAttribute readingAttr
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buffer
private java.lang.StringBuilder buffer
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useRomaji
private boolean useRomaji
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HIRAGANA_START
private static final char HIRAGANA_START
- See Also:
- Constant Field Values
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HIRAGANA_END
private static final char HIRAGANA_END
- See Also:
- Constant Field Values
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Constructor Detail
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JapaneseReadingFormFilter
public JapaneseReadingFormFilter(TokenStream input, boolean useRomaji)
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JapaneseReadingFormFilter
public JapaneseReadingFormFilter(TokenStream input)
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Method Detail
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isHiragana
private boolean isHiragana(char ch)
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containsHiragana
private boolean containsHiragana(java.lang.CharSequence s)
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incrementToken
public boolean incrementToken() throws java.io.IOException
Description copied from class:TokenStream
Consumers (i.e.,IndexWriter
) use this method to advance the stream to the next token. Implementing classes must implement this method and update the appropriateAttributeImpl
s with the attributes of the next token.The producer must make no assumptions about the attributes after the method has been returned: the caller may arbitrarily change it. If the producer needs to preserve the state for subsequent calls, it can use
AttributeSource.captureState()
to create a copy of the current attribute state.This method is called for every token of a document, so an efficient implementation is crucial for good performance. To avoid calls to
AttributeSource.addAttribute(Class)
andAttributeSource.getAttribute(Class)
, references to allAttributeImpl
s that this stream uses should be retrieved during instantiation.To ensure that filters and consumers know which attributes are available, the attributes must be added during instantiation. Filters and consumers are not required to check for availability of attributes in
TokenStream.incrementToken()
.- Specified by:
incrementToken
in classTokenStream
- Returns:
- false for end of stream; true otherwise
- Throws:
java.io.IOException
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