Class BengaliNormalizationFilter
- java.lang.Object
-
- org.apache.lucene.util.AttributeSource
-
- org.apache.lucene.analysis.TokenStream
-
- org.apache.lucene.analysis.TokenFilter
-
- org.apache.lucene.analysis.bn.BengaliNormalizationFilter
-
- All Implemented Interfaces:
java.io.Closeable
,java.lang.AutoCloseable
,Unwrappable<TokenStream>
public final class BengaliNormalizationFilter extends TokenFilter
ATokenFilter
that appliesBengaliNormalizer
to normalize the orthography.In some cases the normalization may cause unrelated terms to conflate, so to prevent terms from being normalized use an instance of
SetKeywordMarkerFilter
or a customTokenFilter
that sets theKeywordAttribute
before thisTokenStream
.- See Also:
BengaliNormalizer
-
-
Nested Class Summary
-
Nested classes/interfaces inherited from class org.apache.lucene.util.AttributeSource
AttributeSource.State
-
-
Field Summary
Fields Modifier and Type Field Description private KeywordAttribute
keywordAtt
private BengaliNormalizer
normalizer
private CharTermAttribute
termAtt
-
Fields inherited from class org.apache.lucene.analysis.TokenFilter
input
-
Fields inherited from class org.apache.lucene.analysis.TokenStream
DEFAULT_TOKEN_ATTRIBUTE_FACTORY
-
-
Constructor Summary
Constructors Constructor Description BengaliNormalizationFilter(TokenStream input)
-
Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description boolean
incrementToken()
Consumers (i.e.,IndexWriter
) use this method to advance the stream to the next token.-
Methods inherited from class org.apache.lucene.analysis.TokenFilter
close, end, reset, unwrap
-
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
-
-
-
-
Field Detail
-
normalizer
private final BengaliNormalizer normalizer
-
termAtt
private final CharTermAttribute termAtt
-
keywordAtt
private final KeywordAttribute keywordAtt
-
-
Constructor Detail
-
BengaliNormalizationFilter
public BengaliNormalizationFilter(TokenStream input)
-
-
Method Detail
-
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
-
-