public final class StemmerOverrideFilter extends TokenFilter
KeywordAttribute
aware stemmer
with custom dictionary-based stemming.Modifier and Type | Class and Description |
---|---|
static class |
StemmerOverrideFilter.Builder
This builder builds an
FST for the StemmerOverrideFilter |
static class |
StemmerOverrideFilter.StemmerOverrideMap
A read-only 4-byte FST backed map that allows fast case-insensitive key
value lookups for
StemmerOverrideFilter |
AttributeSource.AttributeFactory, AttributeSource.State
Constructor and Description |
---|
StemmerOverrideFilter(TokenStream input,
StemmerOverrideFilter.StemmerOverrideMap stemmerOverrideMap)
Create a new StemmerOverrideFilter, performing dictionary-based stemming
with the provided
dictionary . |
Modifier and Type | Method and Description |
---|---|
boolean |
incrementToken()
Consumers (i.e.,
IndexWriter ) use this method to advance the stream to
the next token. |
close, end, reset
addAttribute, addAttributeImpl, captureState, clearAttributes, cloneAttributes, copyTo, equals, getAttribute, getAttributeClassesIterator, getAttributeFactory, getAttributeImplsIterator, hasAttribute, hasAttributes, hashCode, reflectAsString, reflectWith, restoreState, toString
public StemmerOverrideFilter(TokenStream input, StemmerOverrideFilter.StemmerOverrideMap stemmerOverrideMap)
dictionary
.
Any dictionary-stemmed terms will be marked with KeywordAttribute
so that they will not be stemmed with stemmers down the chain.
public boolean incrementToken() throws IOException
TokenStream
IndexWriter
) use this method to advance the stream to
the next token. Implementing classes must implement this method and update
the appropriate AttributeImpl
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)
and AttributeSource.getAttribute(Class)
,
references to all AttributeImpl
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()
.
incrementToken
in class TokenStream
IOException
Copyright © 2010 - 2020 Adobe. All Rights Reserved