Package org.apache.lucene.analysis.stempel

Class StempelFilter

java.lang.Object

org.apache.lucene.util.AttributeSource

org.apache.lucene.analysis.TokenStream

org.apache.lucene.analysis.TokenFilter

org.apache.lucene.analysis.stempel.StempelFilter

All Implemented Interfaces:

Closeable, AutoCloseable, Unwrappable<TokenStream>

public final class StempelFilter
extends TokenFilter

Transforms the token stream as per the stemming algorithm.

Note: the input to the stemming filter must already be in lower case, so you will need to use LowerCaseFilter or LowerCaseTokenizer farther down the Tokenizer chain in order for this to work properly!

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.lucene.util.AttributeSource

AttributeSource.State

Field Summary

Fields

Modifier and Type	Field	Description
static final int	DEFAULT_MIN_LENGTH	Minimum length of input words to be processed.

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
StempelFilter(TokenStream in, StempelStemmer stemmer)	Create filter using the supplied stemming table.
StempelFilter(TokenStream in, StempelStemmer stemmer, int minLength)	Create filter using the supplied stemming table.

Method Summary

Modifier and Type	Method	Description
boolean	incrementToken()	Returns the next input Token, after being stemmed

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

Methods inherited from class java.lang.Object

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

Field Details

DEFAULT_MIN_LENGTH

public static final int DEFAULT_MIN_LENGTH

Minimum length of input words to be processed. Shorter words are returned unchanged.

See Also:

• Constant Field Values

Constructor Details

StempelFilter

public StempelFilter(TokenStream in,
 StempelStemmer stemmer)

Create filter using the supplied stemming table.

Parameters:

in - input token stream

stemmer - stemmer

StempelFilter

public StempelFilter(TokenStream in,
 StempelStemmer stemmer,
 int minLength)

Create filter using the supplied stemming table.

Parameters:

in - input token stream

stemmer - stemmer

minLength - For performance reasons words shorter than minLength characters are not processed, but simply returned.

Method Details

incrementToken

public boolean incrementToken()
                       throws IOException

Returns the next input Token, after being stemmed

Specified by:

incrementToken in class TokenStream

Throws:

IOException