Package org.apache.lucene.analysis.miscellaneous

Class LimitTokenPositionFilter

java.lang.Object

org.apache.lucene.util.AttributeSource

org.apache.lucene.analysis.TokenStream

org.apache.lucene.analysis.TokenFilter

org.apache.lucene.analysis.miscellaneous.LimitTokenPositionFilter

All Implemented Interfaces:

Closeable, AutoCloseable

public final class LimitTokenPositionFilter
extends TokenFilter

This TokenFilter limits its emitted tokens to those with positions that are not greater than the configured limit.

By default, this filter ignores any tokens in the wrapped TokenStream once the limit has been exceeded, which can result in reset() being called prior to incrementToken() returning false. For most TokenStream implementations this should be acceptable, and faster then consuming the full stream. If you are wrapping a TokenStream which requires that the full stream of tokens be exhausted in order to function properly, use the consumeAllTokens option.

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	Description
LimitTokenPositionFilter(TokenStream in, int maxTokenPosition)	Build a filter that only accepts tokens up to and including the given maximum position.
LimitTokenPositionFilter(TokenStream in, int maxTokenPosition, boolean consumeAllTokens)	Build a filter that limits the maximum position of tokens to emit.

Method Summary

Modifier and Type	Method	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, 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

Constructor Detail

LimitTokenPositionFilter

public LimitTokenPositionFilter(TokenStream in,
                                int maxTokenPosition)

Build a filter that only accepts tokens up to and including the given maximum position. This filter will not consume any tokens with position greater than the maxTokenPosition limit.

Parameters:

in - the stream to wrap

maxTokenPosition - max position of tokens to produce (1st token always has position 1)

See Also:

LimitTokenPositionFilter(TokenStream,int,boolean)

LimitTokenPositionFilter

public LimitTokenPositionFilter(TokenStream in,
                                int maxTokenPosition,
                                boolean consumeAllTokens)

Build a filter that limits the maximum position of tokens to emit.

Parameters:

in - the stream to wrap

maxTokenPosition - max position of tokens to produce (1st token always has position 1)

consumeAllTokens - whether all tokens from the wrapped input stream must be consumed even if maxTokenPosition is exceeded.

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