content: package org.apache.lucene.analysis.payloads;
  /**
   * 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 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.index.Payload;
  
  
  /**
   * Adds the {@link org.apache.lucene.analysis.Token#setStartOffset(int)}
   * and {@link org.apache.lucene.analysis.Token#setEndOffset(int)}
   * 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);
        Payload payload = new Payload(data);
        payAtt.setPayload(payload);
        return true;
      } else {
      return false;
      }
    }
  }