JFlexTokenizer.java revision 817883e9f0d419428e8236a09b77cdeeaa034df7
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/*
* Copyright 2010 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
package org.opensolaris.opengrok.analysis;
import org.apache.lucene.analysis.Tokenizer;
import org.apache.lucene.analysis.tokenattributes.OffsetAttribute;
import org.apache.lucene.analysis.tokenattributes.PositionIncrementAttribute;
import org.apache.lucene.analysis.tokenattributes.TermAttribute;
/**
* this class was created because of lucene 2.4.1 update which introduced char[] in Tokens instead of String
* lucene 3.0.0 uses AttributeSource instead of Tokens to make things even easier :-D
*
* Generally this is a "template" for all new Tokenizers, so be carefull when changing it,
* it will impact almost ALL symbol tokenizers in OpenGrok ...
*
* Created on August 24, 2009
* @author Lubos Kosco
*/
public abstract class JFlexTokenizer extends Tokenizer {
// default jflex scanner methods and variables
abstract public boolean yylex() throws java.io.IOException ;
protected TermAttribute termAtt= (TermAttribute) addAttribute(TermAttribute.class);
protected OffsetAttribute offsetAtt=(OffsetAttribute) addAttribute(OffsetAttribute.class);
protected PositionIncrementAttribute posIncrAtt= (PositionIncrementAttribute) addAttribute(PositionIncrementAttribute.class);
/**
* This will reinitalize internal AttributeImpls, or it returns false if end of input Reader ...
* @return false if no more tokens, otherwise true
* @throws java.io.IOException
*/
@Override
public boolean incrementToken() throws java.io.IOException {
return this.yylex();
}
protected void setAttribs(String str, int start, int end) {
//FIXME increasing below by one(default) might be tricky, need more analysis
this.posIncrAtt.setPositionIncrement(1);
this.termAtt.setTermBuffer(str);
this.offsetAtt.setOffset(start, end);
}
}