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.gremlin.result;
  
  import com.alibaba.graphscope.common.result.ResultParser;
  import com.alibaba.graphscope.gaia.proto.IrResult;
  import com.alibaba.graphscope.gremlin.exception.GremlinResultParserException;
  import com.alibaba.pegasus.service.protocol.PegasusClient;
  import com.google.protobuf.InvalidProtocolBufferException;
  
  import java.util.Collections;
  import java.util.List;
  
  public interface GremlinResultParser extends ResultParser {
      @Override
      default List<Object> parseFrom(PegasusClient.JobResponse response) {
          try {
              IrResult.Results results = IrResult.Results.parseFrom(response.getResp());
              Object parseResult = parseFrom(results);
              if (parseResult instanceof EmptyValue) {
                  return Collections.emptyList();
              } else {
                  return Collections.singletonList(parseResult);
              }
          } catch (InvalidProtocolBufferException e) {
              throw new GremlinResultParserException("parse from proto failed " + e);
          }
      }
  
      Object parseFrom(IrResult.Results results);
  }
  