/*
* 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.
*/
package org.apache.lucene.analysis.payloads;
import java.io.IOException;
import org.apache.lucene.analysis.TokenFilter;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.tokenattributes.OffsetAttribute;
import org.apache.lucene.analysis.tokenattributes.PayloadAttribute;
import org.apache.lucene.util.BytesRef;
/**
* Adds the {@link OffsetAttribute#startOffset()}
* and {@link OffsetAttribute#endOffset()}
* First 4 bytes are the start
*
**/
public class TokenOffsetPayloadTokenFilter extends TokenFilter {
private final OffsetAttribute offsetAtt = addAttribute(OffsetAttribute.class);
private final PayloadAttribute payAtt = addAttribute(PayloadAttribute.class);
public TokenOffsetPayloadTokenFilter(TokenStream input) {
super(input);
}
@Override
public final boolean incrementToken() throws IOException {
if (input.incrementToken()) {
byte[] data = new byte[8];
PayloadHelper.encodeInt(offsetAtt.startOffset(), data, 0);
PayloadHelper.encodeInt(offsetAtt.endOffset(), data, 4);
BytesRef payload = new BytesRef(data);
payAtt.setPayload(payload);
return true;
} else {
return false;
}
}
}