content: package org.apache.lucene.search.spans;
  /**
   * 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.util.ToStringUtils;
  
  import java.io.IOException;
  import java.util.Arrays;
  import java.util.Collection;
  
  
  /**
   * Only return those matches that have a specific payload at
   * the given position.
   * <p/>
   * 
   */
  public class SpanNearPayloadCheckQuery extends SpanPositionCheckQuery {
    protected final Collection<byte[]> payloadToMatch;
  
    /**
     * @param match          The underlying {@link SpanQuery} to check
     * @param payloadToMatch The {@link java.util.Collection} of payloads to match
     */
    public SpanNearPayloadCheckQuery(SpanNearQuery match, Collection<byte[]> payloadToMatch) {
      super(match);
      this.payloadToMatch = payloadToMatch;
    }
  
    @Override
    protected AcceptStatus acceptPosition(Spans spans) throws IOException {
      boolean result = spans.isPayloadAvailable();
      if (result == true) {
        Collection<byte[]> candidate = spans.getPayload();
        if (candidate.size() == payloadToMatch.size()) {
          //TODO: check the byte arrays are the same
          //hmm, can't rely on order here
          int matches = 0;
          for (byte[] candBytes : candidate) {
            //Unfortunately, we can't rely on order, so we need to compare all
            for (byte[] payBytes : payloadToMatch) {
              if (Arrays.equals(candBytes, payBytes) == true) {
                matches++;
                break;
              }
            }
          }
          if (matches == payloadToMatch.size()){
            //we've verified all the bytes
            return AcceptStatus.YES;
          } else {
            return AcceptStatus.NO;
          }
        } else {
          return AcceptStatus.NO;
        }
      }
      return AcceptStatus.NO;
    }
  
    @Override
    public String toString(String field) {
      StringBuilder buffer = new StringBuilder();
      buffer.append("spanPayCheck(");
      buffer.append(match.toString(field));
      buffer.append(", payloadRef: ");
      for (byte[] bytes : payloadToMatch) {
        ToStringUtils.byteArray(buffer, bytes);
        buffer.append(';');
      }
      buffer.append(")");
      buffer.append(ToStringUtils.boost(getBoost()));
      return buffer.toString();
    }
  
    @Override
    public Object clone() {
      SpanNearPayloadCheckQuery result = new SpanNearPayloadCheckQuery((SpanNearQuery) match.clone(), payloadToMatch);
      result.setBoost(getBoost());
      return result;
    }
  
    @Override
    public boolean equals(Object o) {
      if (this == o) return true;
      if (!(o instanceof SpanNearPayloadCheckQuery)) return false;
  
      SpanNearPayloadCheckQuery other = (SpanNearPayloadCheckQuery) o;
      return this.payloadToMatch.equals(other.payloadToMatch)
              && this.match.equals(other.match)
              && this.getBoost() == other.getBoost();
    }
  
    @Override
    public int hashCode() {
      int h = match.hashCode();
      h ^= (h << 8) | (h >>> 25);  // reversible
      //TODO: is this right?
      h ^= payloadToMatch.hashCode();
      h ^= Float.floatToRawIntBits(getBoost());
      return h;
    }
  }