/**
* @param input
* @param reusableToken is null well new one auto.
* @return null - if not next token or input is null.
* @throws IOException
*/
public static Token nextToken(TokenStream input, Token reusableToken) throws IOException {
if (input == null) {
return null;
}
if (!input.incrementToken()) {
return null;
}
CharTermAttribute termAtt = (CharTermAttribute) input.getAttribute(CharTermAttribute.class);
OffsetAttribute offsetAtt = (OffsetAttribute) input.getAttribute(OffsetAttribute.class);
TypeAttribute typeAtt = (TypeAttribute) input.getAttribute(TypeAttribute.class);
if (reusableToken == null) {
reusableToken = new Token();
}
reusableToken.clear();
if (termAtt != null) {
// lucene 3.0
// reusableToken.setTermBuffer(termAtt.termBuffer(), 0, termAtt.termLength());
// lucene 3.1
reusableToken.copyBuffer(termAtt.buffer(), 0, termAtt.length());
}
if (offsetAtt != null) {
// lucene 3.1
// reusableToken.setStartOffset(offsetAtt.startOffset());
// reusableToken.setEndOffset(offsetAtt.endOffset());
// lucene 4.0
reusableToken.setOffset(offsetAtt.startOffset(), offsetAtt.endOffset());
}
if (typeAtt != null) {
reusableToken.setType(typeAtt.type());
}
return reusableToken;
}
