org.apache.lucene.analysis.ko

Class KoreanTokenizer

java.lang.Object

org.apache.lucene.util.AttributeSource

org.apache.lucene.analysis.TokenStream

org.apache.lucene.analysis.Tokenizer

org.apache.lucene.analysis.ko.KoreanTokenizer

All Implemented Interfaces:

Closeable, AutoCloseable

public final class KoreanTokenizer
extends Tokenizer

Tokenizer for Korean that uses morphological analysis.

This tokenizer sets a number of additional attributes:

• PartOfSpeechAttribute containing part-of-speech.
• ReadingAttribute containing reading.

This tokenizer uses a rolling Viterbi search to find the least cost segmentation (path) of the incoming characters.

WARNING: This API is experimental and might change in incompatible ways in the next release.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	KoreanTokenizer.DecompoundMode Decompound mode: this determines how the tokenizer handles POS.Type.COMPOUND, POS.Type.INFLECT and POS.Type.PREANALYSIS tokens.
static class	KoreanTokenizer.Type Token type reflecting the original source of this token

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

AttributeSource.State

Field Summary

Fields

Modifier and Type	Field and Description
static KoreanTokenizer.DecompoundMode	DEFAULT_DECOMPOUND Default mode for the decompound of tokens (KoreanTokenizer.DecompoundMode.DISCARD.

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

input

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

DEFAULT_TOKEN_ATTRIBUTE_FACTORY

Constructor Summary

Constructors

Constructor and Description
KoreanTokenizer() Creates a new KoreanTokenizer with default parameters.
KoreanTokenizer(AttributeFactory factory, UserDictionary userDictionary, KoreanTokenizer.DecompoundMode mode, boolean outputUnknownUnigrams) Create a new KoreanTokenizer.
KoreanTokenizer(AttributeFactory factory, UserDictionary userDictionary, KoreanTokenizer.DecompoundMode mode, boolean outputUnknownUnigrams, boolean discardPunctuation) Create a new KoreanTokenizer.

Method Summary

Modifier and Type	Method and Description
void	close()
void	end()
boolean	incrementToken()
void	reset()
void	setGraphvizFormatter(GraphvizFormatter dotOut) Expert: set this to produce graphviz (dot) output of the Viterbi lattice

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

correctOffset, setReader

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

Field Detail

DEFAULT_DECOMPOUND

public static final KoreanTokenizer.DecompoundMode DEFAULT_DECOMPOUND

Default mode for the decompound of tokens (KoreanTokenizer.DecompoundMode.DISCARD.

Constructor Detail

KoreanTokenizer

public KoreanTokenizer()

Creates a new KoreanTokenizer with default parameters.

Uses the default AttributeFactory.

KoreanTokenizer

public KoreanTokenizer(AttributeFactory factory,
                       UserDictionary userDictionary,
                       KoreanTokenizer.DecompoundMode mode,
                       boolean outputUnknownUnigrams)

Create a new KoreanTokenizer.

Parameters:

factory - the AttributeFactory to use

userDictionary - Optional: if non-null, user dictionary.

mode - Decompound mode.

outputUnknownUnigrams - If true outputs unigrams for unknown words.

KoreanTokenizer

public KoreanTokenizer(AttributeFactory factory,
                       UserDictionary userDictionary,
                       KoreanTokenizer.DecompoundMode mode,
                       boolean outputUnknownUnigrams,
                       boolean discardPunctuation)

Create a new KoreanTokenizer.

Parameters:

factory - the AttributeFactory to use

userDictionary - Optional: if non-null, user dictionary.

mode - Decompound mode.

outputUnknownUnigrams - If true outputs unigrams for unknown words.

discardPunctuation - true if punctuation tokens should be dropped from the output.

Method Detail

setGraphvizFormatter

public void setGraphvizFormatter(GraphvizFormatter dotOut)

Expert: set this to produce graphviz (dot) output of the Viterbi lattice

close

public void close()
           throws IOException

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

Overrides:

close in class Tokenizer

Throws:

IOException

reset

public void reset()
           throws IOException

Overrides:

reset in class Tokenizer

Throws:

IOException

end

public void end()
         throws IOException

Overrides:

end in class TokenStream

Throws:

IOException

incrementToken

public boolean incrementToken()
                       throws IOException

Specified by:

incrementToken in class TokenStream

Throws:

IOException