content: /*
   *
   *  * Copyright 2020 Alibaba Group Holding Limited.
   *  *
   *  * Licensed 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 com.alibaba.graphscope.sdk;
  
  import com.alibaba.graphscope.common.config.Configs;
  import com.alibaba.graphscope.common.ir.planner.GraphRelOptimizer;
  import com.alibaba.graphscope.common.ir.planner.PlannerGroupManager;
  import com.alibaba.graphscope.common.ir.tools.GraphPlanner;
  import com.alibaba.graphscope.common.ir.tools.LogicalPlanFactory;
  
  public class GraphPlanerInstance {
      private static GraphPlanner planner;
  
      public static synchronized GraphPlanner getInstance(Configs configs) {
          if (planner == null) {
              GraphRelOptimizer optimizer =
                      new GraphRelOptimizer(configs, PlannerGroupManager.Static.class);
              planner = new GraphPlanner(configs, new LogicalPlanFactory.Cypher(), optimizer);
          }
          return planner;
      }
  }
  