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.PayloadAttribute;
import org.apache.lucene.analysis.tokenattributes.PositionIncrementAttribute;
import org.apache.lucene.util.BytesRef;
import java.io.IOException;
import java.io.Reader;
/**
* Wraps a whitespace tokenizer with a filter that sets
* the first token, and odd tokens to posinc=1, and all others
* to 0, encoding the position as pos: XXX in the payload.
**/
public final class MockPayloadAnalyzer extends Analyzer {
@Override
public TokenStreamComponents createComponents(String fieldName, Reader reader) {
Tokenizer result = new MockTokenizer(reader, MockTokenizer.WHITESPACE, true);
return new TokenStreamComponents(result, new MockPayloadFilter(result, fieldName));
}
}
/**
*
*
**/
final class MockPayloadFilter extends TokenFilter {
String fieldName;
int pos;
int i;
final PositionIncrementAttribute posIncrAttr;
final PayloadAttribute payloadAttr;
final CharTermAttribute termAttr;
public MockPayloadFilter(TokenStream input, String fieldName) {
super(input);
this.fieldName = fieldName;
pos = 0;
i = 0;
posIncrAttr = input.addAttribute(PositionIncrementAttribute.class);
payloadAttr = input.addAttribute(PayloadAttribute.class);
termAttr = input.addAttribute(CharTermAttribute.class);
}
@Override
public boolean incrementToken() throws IOException {
if (input.incrementToken()) {
payloadAttr.setPayload(new BytesRef(("pos: " + pos).getBytes("UTF-8")));
int posIncr;
if (pos == 0 || i % 2 == 1) {
posIncr = 1;
} else {
posIncr = 0;
}
posIncrAttr.setPositionIncrement(posIncr);
pos += posIncr;
i++;
return true;
} else {
return false;
}
}
@Override
public void reset() throws IOException {
super.reset();
i = 0;
pos = 0;
}
}