code: /*
   * 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.skywalking.library.elasticsearch.response.search;
  
  import com.fasterxml.jackson.core.JsonParser;
  import com.fasterxml.jackson.databind.DeserializationContext;
  import com.fasterxml.jackson.databind.JsonDeserializer;
  import com.fasterxml.jackson.databind.JsonNode;
  import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
  import java.io.IOException;
  import java.util.Collections;
  import java.util.Iterator;
  import java.util.List;
  import lombok.Getter;
  import lombok.Setter;
  
  @Getter
  @Setter
  public final class SearchHits implements Iterable<SearchHit> {
      @JsonDeserialize(using = TotalDeserializer.class)
      private int total;
      private List<SearchHit> hits;
  
      public List<SearchHit> getHits() {
          if (hits != null) {
              return hits;
          }
          return Collections.emptyList();
      }
  
      @Override
      public Iterator<SearchHit> iterator() {
          return getHits().iterator();
      }
  
      static final class TotalDeserializer extends JsonDeserializer<Integer> {
          @Override
          public Integer deserialize(final JsonParser p, final DeserializationContext ctxt)
              throws IOException {
              final JsonNode node = p.getCodec().readTree(p);
              if (node.isInt()) {
                  return node.asInt();
              }
              final JsonNode value = node.get("value");
              if (value.isInt()) {
                  return value.asInt();
              }
              throw new UnsupportedOperationException("Search response total field is not integer");
          }
      }
  }
  