org.apache.lucene.analysis.th
Class ThaiWordFilter

java.lang.Object
  extended by org.apache.lucene.util.AttributeSource
      extended by org.apache.lucene.analysis.TokenStream
          extended by org.apache.lucene.analysis.TokenFilter
              extended by org.apache.lucene.analysis.th.ThaiWordFilter
All Implemented Interfaces:
Closeable

public final class ThaiWordFilter
extends 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
AttributeSource.AttributeFactory, 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(Version matchVersion, 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
 
Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, toString, 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

public ThaiWordFilter(Version matchVersion,
                      TokenStream input)
Creates a new ThaiWordFilter with the specified match version.

Method Detail

incrementToken

public boolean incrementToken()
                       throws IOException
Specified by:
incrementToken in class TokenStream
Throws:
IOException

reset

public void reset()
           throws IOException
Overrides:
reset in class TokenFilter
Throws:
IOException


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