Package org.apache.lucene.analysis.tr

Class TurkishLowerCaseFilter

java.lang.Object

org.apache.lucene.util.AttributeSource

org.apache.lucene.analysis.TokenStream

org.apache.lucene.analysis.TokenFilter

org.apache.lucene.analysis.tr.TurkishLowerCaseFilter

All Implemented Interfaces:

Closeable, AutoCloseable

public final class TurkishLowerCaseFilter
extends TokenFilter

Normalizes Turkish token text to lower case.

Turkish and Azeri have unique casing behavior for some characters. This filter applies Turkish lowercase rules. For more information, see http://en.wikipedia.org/wiki/Turkish_dotted_and_dotless_I

Nested Class Summary

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

AttributeSource.AttributeFactory, AttributeSource.State

Constructor Summary

Constructors

Constructor	Description
TurkishLowerCaseFilter(TokenStream in)	Create a new TurkishLowerCaseFilter, that normalizes Turkish token text to lower case.

Method Summary

Modifier and Type	Method	Description
final boolean	incrementToken()	Consumers (i.e., IndexWriter) use this method to advance the stream to the next token.

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, toString

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Constructor Details

TurkishLowerCaseFilter

public TurkishLowerCaseFilter(TokenStream in)

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

Parameters:

in - TokenStream to filter

Method Details

incrementToken

public final boolean incrementToken()
                             throws IOException

Description copied from class: TokenStream

Consumers (i.e., IndexWriter) use this method to advance the stream to the next token. Implementing classes must implement this method and update the appropriate AttributeImpls with the attributes of the next token.

The producer must make no assumptions about the attributes after the method has been returned: the caller may arbitrarily change it. If the producer needs to preserve the state for subsequent calls, it can use AttributeSource.captureState() to create a copy of the current attribute state.

This method is called for every token of a document, so an efficient implementation is crucial for good performance. To avoid calls to AttributeSource.addAttribute(Class) and AttributeSource.getAttribute(Class), references to all AttributeImpls that this stream uses should be retrieved during instantiation.

To ensure that filters and consumers know which attributes are available, the attributes must be added during instantiation. Filters and consumers are not required to check for availability of attributes in TokenStream.incrementToken().

Specified by:

incrementToken in class TokenStream

Returns:

false for end of stream; true otherwise

Throws:

IOException