package org.apache.lucene.analysis;
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import org.apache.lucene.analysis.tokenattributes.CharTermAttribute;
import org.apache.lucene.analysis.tokenattributes.OffsetAttribute;
import org.apache.lucene.analysis.tokenattributes.PayloadAttribute;
import org.apache.lucene.analysis.tokenattributes.PositionIncrementAttribute;
import org.apache.lucene.analysis.tokenattributes.PositionLengthAttribute;
/**
* TokenStream from a canned list of Tokens.
*/
public final class CannedTokenStream extends TokenStream {
private final Token[] tokens;
private int upto = 0;
private final CharTermAttribute termAtt = addAttribute(CharTermAttribute.class);
private final PositionIncrementAttribute posIncrAtt = addAttribute(PositionIncrementAttribute.class);
private final PositionLengthAttribute posLengthAtt = addAttribute(PositionLengthAttribute.class);
private final OffsetAttribute offsetAtt = addAttribute(OffsetAttribute.class);
private final PayloadAttribute payloadAtt = addAttribute(PayloadAttribute.class);
public CannedTokenStream(Token... tokens) {
this.tokens = tokens;
}
@Override
public boolean incrementToken() {
if (upto < tokens.length) {
final Token token = tokens[upto++];
// TODO: can we just capture/restoreState so
// we get all attrs...?
clearAttributes();
termAtt.setEmpty();
termAtt.append(token.toString());
posIncrAtt.setPositionIncrement(token.getPositionIncrement());
posLengthAtt.setPositionLength(token.getPositionLength());
offsetAtt.setOffset(token.startOffset(), token.endOffset());
payloadAtt.setPayload(token.getPayload());
return true;
} else {
return false;
}
}
}