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.PayloadAttribute;
  import org.apache.lucene.analysis.tokenattributes.CharTermAttribute;
  
  
  /**
   * Characters before the delimiter are the "token", those after are the payload.
   * <p/>
   * For example, if the delimiter is '|', then for the string "foo|bar", foo is the token
   * and "bar" is a payload.
   * <p/>
   * Note, you can also include a {@link org.apache.lucene.analysis.payloads.PayloadEncoder} to convert the payload in an appropriate way (from characters to bytes).
   * <p/>
   * Note make sure your Tokenizer doesn't split on the delimiter, or this won't work
   *
   * @see PayloadEncoder
   */
  public final class DelimitedPayloadTokenFilter extends TokenFilter {
    public static final char DEFAULT_DELIMITER = '|';
    private final char delimiter;
    private final CharTermAttribute termAtt = addAttribute(CharTermAttribute.class);
    private final PayloadAttribute payAtt = addAttribute(PayloadAttribute.class);
    private final PayloadEncoder encoder;
  
  
    public DelimitedPayloadTokenFilter(TokenStream input, char delimiter, PayloadEncoder encoder) {
      super(input);
      this.delimiter = delimiter;
      this.encoder = encoder;
    }
  
    @Override
    public boolean incrementToken() throws IOException {
      if (input.incrementToken()) {
        final char[] buffer = termAtt.buffer();
        final int length = termAtt.length();
        for (int i = 0; i < length; i++) {
          if (buffer[i] == delimiter) {
            payAtt.setPayload(encoder.encode(buffer, i + 1, (length - (i + 1))));
            termAtt.setLength(i); // simply set a new length
            return true;
          }
        }
        // we have not seen the delimiter
        payAtt.setPayload(null);
        return true;
      } else return false;
    }
  }
  