org.apache.lucene.analysis.cn
Class ChineseFilter

java.lang.Object
  extended by org.apache.lucene.analysis.TokenStream
      extended by org.apache.lucene.analysis.TokenFilter
          extended by org.apache.lucene.analysis.cn.ChineseFilter

public final class ChineseFilter
extends TokenFilter

Title: ChineseFilter Description: Filter with a stop word table Rule: No digital is allowed. English word/token should larger than 1 character. One Chinese character as one Chinese word. TO DO: 1. Add Chinese stop words, such as  2. Dictionary based Chinese word extraction 3. Intelligent Chinese word extraction Copyright: Copyright (c) 2001 Company:

Version:
1.0

Field Summary
static java.lang.String[] STOP_WORDS
           
 
Fields inherited from class org.apache.lucene.analysis.TokenFilter
input
 
Constructor Summary
ChineseFilter(TokenStream in)
           
 
Method Summary
 Token next(Token reusableToken)
          Returns the next token in the stream, or null at EOS.
 
Methods inherited from class org.apache.lucene.analysis.TokenFilter
close, reset
 
Methods inherited from class org.apache.lucene.analysis.TokenStream
next
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

STOP_WORDS

public static final java.lang.String[] STOP_WORDS
Constructor Detail

ChineseFilter

public ChineseFilter(TokenStream in)
Method Detail

next

public final Token next(Token reusableToken)
                 throws java.io.IOException
Description copied from class: TokenStream
Returns the next token in the stream, or null at EOS. When possible, the input Token should be used as the returned Token (this gives fastest tokenization performance), but this is not required and a new Token may be returned. Callers may re-use a single Token instance for successive calls to this method.

This implicitly defines a "contract" between consumers (callers of this method) and producers (implementations of this method that are the source for tokens):

Also, the producer must make no assumptions about a Token after it has been returned: the caller may arbitrarily change it. If the producer needs to hold onto the token for subsequent calls, it must clone() it before storing it. Note that a TokenFilter is considered a consumer.

Overrides:
next in class TokenStream
Parameters:
reusableToken - a Token that may or may not be used to return; this parameter should never be null (the callee is not required to check for null before using it, but it is a good idea to assert that it is not null.)
Returns:
next token in the stream or null if end-of-stream was hit
Throws:
java.io.IOException


Copyright © 2000-2009 Apache Software Foundation. All Rights Reserved.