org.apache.lucene.analysis.core

Class LowerCaseFilter

java.lang.Object

org.apache.lucene.util.AttributeSource

org.apache.lucene.analysis.TokenStream

org.apache.lucene.analysis.TokenFilter

org.apache.lucene.analysis.core.LowerCaseFilter

All Implemented Interfaces:

Closeable

public final class LowerCaseFilter
extends TokenFilter

Normalizes token text to lower case.

You must specify the required Version compatibility when creating LowerCaseFilter:

• As of 3.1, supplementary characters are properly lowercased.

Nested Class Summary

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

AttributeSource.AttributeFactory, AttributeSource.State

Field Summary

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

input

Constructor Summary

Constructors

Constructor and Description
LowerCaseFilter(Version matchVersion, TokenStream in) Create a new LowerCaseFilter, that normalizes token text to lower case.

Method Summary

Methods

Modifier and Type	Method and Description
boolean	incrementToken()

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

close, end, reset

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

Methods inherited from class java.lang.Object

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

Constructor Detail

LowerCaseFilter

public LowerCaseFilter(Version matchVersion,
               TokenStream in)

Create a new LowerCaseFilter, that normalizes token text to lower case.

Parameters:

matchVersion - See above

in - TokenStream to filter

Method Detail

incrementToken

public final boolean incrementToken()
                             throws IOException

Specified by:

incrementToken in class TokenStream

Throws:

IOException