org.apache.lucene.analysis.miscellaneous

Class PrefixAwareTokenFilter

java.lang.Object

org.apache.lucene.util.AttributeSource

org.apache.lucene.analysis.TokenStream

org.apache.lucene.analysis.miscellaneous.PrefixAwareTokenFilter

All Implemented Interfaces:

Closeable, AutoCloseable

public class PrefixAwareTokenFilter
extends TokenStream

Joins two token streams and leaves the last token of the first stream available to be used when updating the token values in the second stream based on that token. The default implementation adds last prefix token end offset to the suffix token start and end offsets.

NOTE: This filter might not behave correctly if used with custom Attributes, i.e. Attributes other than the ones located in org.apache.lucene.analysis.tokenattributes.

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.TokenStream

DEFAULT_TOKEN_ATTRIBUTE_FACTORY

Constructor Summary

Constructors

Constructor and Description
PrefixAwareTokenFilter(TokenStream prefix, TokenStream suffix)

Method Summary

Methods

Modifier and Type	Method and Description
void	close()
void	end()
TokenStream	getPrefix()
TokenStream	getSuffix()
boolean	incrementToken()
void	reset()
void	setPrefix(TokenStream prefix)
void	setSuffix(TokenStream suffix)
Token	updateSuffixToken(Token suffixToken, Token lastPrefixToken) The default implementation adds last prefix token end offset to the suffix token start and end offsets.

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

PrefixAwareTokenFilter

public PrefixAwareTokenFilter(TokenStream prefix,
                      TokenStream suffix)

Method Detail

incrementToken

public final boolean incrementToken()
                             throws IOException

Specified by:

incrementToken in class TokenStream

Throws:

IOException

updateSuffixToken

public Token updateSuffixToken(Token suffixToken,
                      Token lastPrefixToken)

The default implementation adds last prefix token end offset to the suffix token start and end offsets.

Parameters:

suffixToken - a token from the suffix stream

lastPrefixToken - the last token from the prefix stream

Returns:

consumer token

end

public void end()
         throws IOException

Overrides:

end in class TokenStream

Throws:

IOException

close

public void close()
           throws IOException

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

Overrides:

close in class TokenStream

Throws:

IOException

reset

public void reset()
           throws IOException

Overrides:

reset in class TokenStream

Throws:

IOException

getPrefix

public TokenStream getPrefix()

setPrefix

public void setPrefix(TokenStream prefix)

getSuffix

public TokenStream getSuffix()

setSuffix

public void setSuffix(TokenStream suffix)