org.apache.lucene.analysis.th
Class ThaiWordFilter

java.lang.Object
  org.apache.lucene.util.AttributeSource
      org.apache.lucene.analysis.TokenStream
          org.apache.lucene.analysis.TokenFilter
              org.apache.lucene.analysis.th.ThaiWordFilter

All Implemented Interfaces:

Closeable

public final class ThaiWordFilter
extends org.apache.lucene.analysis.TokenFilter

TokenFilter that use BreakIterator to break each Token that is Thai into separate Token(s) for each Thai word.

Please note: Since matchVersion 3.1 on, this filter no longer lowercases non-thai text. ThaiAnalyzer will insert a LowerCaseFilter before this filter so the behaviour of the Analyzer does not change. With version 3.1, the filter handles position increments correctly.

WARNING: this filter may not be supported by all JREs. It is known to work with Sun/Oracle and Harmony JREs. If your application needs to be fully portable, consider using ICUTokenizer instead, which uses an ICU Thai BreakIterator that will always be available.

Nested Class Summary

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

org.apache.lucene.util.AttributeSource.AttributeFactory, org.apache.lucene.util.AttributeSource.State

Field Summary

static boolean

DBBI_AVAILABLE True if the JRE supports a working dictionary-based breakiterator for Thai.

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

input

Constructor Summary

ThaiWordFilter(org.apache.lucene.analysis.TokenStream input)
Deprecated. Use the ctor with matchVersion instead!

ThaiWordFilter(org.apache.lucene.util.Version matchVersion, org.apache.lucene.analysis.TokenStream input)
Creates a new ThaiWordFilter with the specified match version.

Method Summary

boolean	incrementToken()
void	reset()

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

close, end

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

Field Detail

DBBI_AVAILABLE

public static final boolean DBBI_AVAILABLE

True if the JRE supports a working dictionary-based breakiterator for Thai. If this is false, this filter will not work at all!

Constructor Detail

ThaiWordFilter

@Deprecated
public ThaiWordFilter(org.apache.lucene.analysis.TokenStream input)

Deprecated. Use the ctor with matchVersion instead!

Creates a new ThaiWordFilter that also lowercases non-thai text.

ThaiWordFilter

public ThaiWordFilter(org.apache.lucene.util.Version matchVersion,
                      org.apache.lucene.analysis.TokenStream input)

Creates a new ThaiWordFilter with the specified match version.

Method Detail

incrementToken

public boolean incrementToken()
                       throws IOException

Specified by:

incrementToken in class org.apache.lucene.analysis.TokenStream

Throws:

IOException

reset

public void reset()
           throws IOException

Overrides:

reset in class org.apache.lucene.analysis.TokenFilter

Throws:

IOException