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 org.apache.lucene.analysis.TokenFilter;
  import org.apache.lucene.analysis.TokenStream;
  import org.apache.lucene.analysis.tokenattributes.PayloadAttribute;
  import org.apache.lucene.analysis.tokenattributes.TypeAttribute;
  import org.apache.lucene.index.Payload;
  
  import java.io.IOException;
  
  
  /**
   * Makes the {@link org.apache.lucene.analysis.Token#type()} a payload.
   *
   * Encodes the type using {@link String#getBytes(String)} with "UTF-8" as the encoding
   *
   **/
  public class TypeAsPayloadTokenFilter extends TokenFilter {
    private final PayloadAttribute payloadAtt = addAttribute(PayloadAttribute.class);
    private final TypeAttribute typeAtt = addAttribute(TypeAttribute.class);
  
    public TypeAsPayloadTokenFilter(TokenStream input) {
      super(input);
    }
  
  
    @Override
    public final boolean incrementToken() throws IOException {
      if (input.incrementToken()) {
        String type = typeAtt.type();
        if (type != null && type.equals("") == false) {
          payloadAtt.setPayload(new Payload(type.getBytes("UTF-8")));
        }
        return true;
      } else {
        return false;
      }
    }
  }