Package org.apache.lucene.analysis

Class Tokenizer

java.lang.Object

org.apache.lucene.util.AttributeSource

org.apache.lucene.analysis.TokenStream

org.apache.lucene.analysis.Tokenizer

All Implemented Interfaces:

java.io.Closeable, java.lang.AutoCloseable

Direct Known Subclasses:

CharTokenizer, ChineseTokenizer, CJKTokenizer, ClassicTokenizer, KeywordTokenizer, Lucene43EdgeNGramTokenizer, Lucene43NGramTokenizer, NGramTokenizer, PathHierarchyTokenizer, PatternTokenizer, ReversePathHierarchyTokenizer, StandardTokenizer, UAX29URLEmailTokenizer, WikipediaTokenizer

public abstract class Tokenizer
extends TokenStream

A Tokenizer is a TokenStream whose input is a Reader.

This is an abstract class; subclasses must override TokenStream.incrementToken()

NOTE: Subclasses overriding TokenStream.incrementToken() must call AttributeSource.clearAttributes() before setting attributes.

Nested Class Summary

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

AttributeSource.AttributeFactory, AttributeSource.State

Method Summary

Modifier and Type	Method	Description
void	close()	Releases resources associated with this stream.
void	reset()	This method is called by a consumer before it begins consumption using TokenStream.incrementToken().
void	setReader(java.io.Reader input)	Expert: Set a new reader on the Tokenizer.

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

end, incrementToken

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

Method Detail

close

public void close()
           throws java.io.IOException

Releases resources associated with this stream.

If you override this method, always call super.close(), otherwise some internal state will not be correctly reset (e.g., Tokenizer will throw IllegalStateException on reuse).

NOTE: The default implementation closes the input Reader, so be sure to call super.close() when overriding this method.

Specified by:

close in interface java.lang.AutoCloseable

Specified by:

close in interface java.io.Closeable

Overrides:

close in class TokenStream

Throws:

java.io.IOException

setReader

public final void setReader(java.io.Reader input)
                     throws java.io.IOException

Expert: Set a new reader on the Tokenizer. Typically, an analyzer (in its tokenStream method) will use this to re-use a previously created tokenizer.

Throws:

java.io.IOException

reset

public void reset()
           throws java.io.IOException

Description copied from class: TokenStream

This method is called by a consumer before it begins consumption using TokenStream.incrementToken().

Resets this stream to a clean state. Stateful implementations must implement this method so that they can be reused, just as if they had been created fresh.

If you override this method, always call super.reset(), otherwise some internal state will not be correctly reset (e.g., Tokenizer will throw IllegalStateException on further usage).

Overrides:

reset in class TokenStream

Throws:

java.io.IOException