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.oap.server.storage.plugin.elasticsearch.base;
  
  import org.apache.skywalking.library.elasticsearch.requests.search.SearchParams;
  import org.apache.skywalking.oap.server.core.storage.model.Model;
  import org.apache.skywalking.oap.server.core.storage.annotation.ElasticSearch;
  
  import java.util.Optional;
  
  public class RoutingUtils {
  
      public static void addRoutingValueToSearchParam(SearchParams searchParams, String routingValue) {
          if (!IndexController.INSTANCE.isEnableCustomRouting()) {
              return;
          }
          searchParams.routing(routingValue);
      }
  
      public static void addRoutingValuesToSearchParam(SearchParams searchParams, Iterable<String> routingValues) {
          if (!IndexController.INSTANCE.isEnableCustomRouting()) {
              return;
          }
          searchParams.routing(routingValues);
      }
  
      /**
       * get the value of the field annotated {@link ElasticSearch.Routing}
       */
      public static Optional<String> getRoutingValue(final Model model, final ElasticSearchConverter.ToStorage toStorage) {
          if (!IndexController.INSTANCE.isEnableCustomRouting()) {
              return Optional.empty();
          }
          Optional<String> routingField = model.getElasticSearchModelExtension().getRouting();
          return routingField.map(v -> extractRoutingValue(v, toStorage));
      }
  
      private static String extractRoutingValue(String routingField, ElasticSearchConverter.ToStorage toStorage) {
          Object value = toStorage.get(routingField);
          if (value == null) {
              return null;
          }
          return value.toString();
      }
  }
  