org.apache.lucene.analysis.hunspell

Class HunspellStemFilter

java.lang.Object

org.apache.lucene.util.AttributeSource

org.apache.lucene.analysis.TokenStream

org.apache.lucene.analysis.TokenFilter

org.apache.lucene.analysis.hunspell.HunspellStemFilter

All Implemented Interfaces:

Closeable, AutoCloseable

public final class HunspellStemFilter
extends TokenFilter

TokenFilter that uses hunspell affix rules and words to stem tokens. Since hunspell supports a word having multiple stems, this filter can emit multiple tokens for each consumed token

Note: This filter is aware of the KeywordAttribute. To prevent certain terms from being passed to the stemmer KeywordAttribute.isKeyword() should be set to true in a previous TokenStream. Note: For including the original term as well as the stemmed version, see KeywordRepeatFilterFactory

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.util.AttributeSource

AttributeSource.State

Field Summary

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 and Description
HunspellStemFilter(TokenStream input, Dictionary dictionary) Create a HunspellStemFilter outputting all possible stems.
HunspellStemFilter(TokenStream input, Dictionary dictionary, boolean dedup) Create a HunspellStemFilter outputting all possible stems.
HunspellStemFilter(TokenStream input, Dictionary dictionary, boolean dedup, boolean longestOnly) Creates a new HunspellStemFilter that will stem tokens from the given TokenStream using affix rules in the provided Dictionary

Method Summary

Methods

Modifier and Type	Method and Description
boolean	incrementToken()
void	reset()

Methods inherited from class org.apache.lucene.analysis.TokenFilter

close, end

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, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

HunspellStemFilter

public HunspellStemFilter(TokenStream input,
                  Dictionary dictionary)

Create a HunspellStemFilter outputting all possible stems.

See Also:

HunspellStemFilter(TokenStream, Dictionary, boolean)

HunspellStemFilter

public HunspellStemFilter(TokenStream input,
                  Dictionary dictionary,
                  boolean dedup)

Create a HunspellStemFilter outputting all possible stems.

See Also:

HunspellStemFilter(TokenStream, Dictionary, boolean, boolean)

HunspellStemFilter

public HunspellStemFilter(TokenStream input,
                  Dictionary dictionary,
                  boolean dedup,
                  boolean longestOnly)

Creates a new HunspellStemFilter that will stem tokens from the given TokenStream using affix rules in the provided Dictionary

Parameters:

input - TokenStream whose tokens will be stemmed

dictionary - HunspellDictionary containing the affix rules and words that will be used to stem the tokens

longestOnly - true if only the longest term should be output.

Method Detail

incrementToken

public boolean incrementToken()
                       throws IOException

Specified by:

incrementToken in class TokenStream

Throws:

IOException

reset

public void reset()
           throws IOException

Overrides:

reset in class TokenFilter

Throws:

IOException