content: /**
   * Copyright 2024 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.gaia.clients.kuzu;
  
  import com.alibaba.graphscope.gaia.clients.GraphResultSet;
  import com.kuzudb.KuzuFlatTuple;
  import com.kuzudb.KuzuQueryResult;
  
  public class KuzuGraphResult implements GraphResultSet {
  
      KuzuQueryResult result;
  
      public KuzuGraphResult(KuzuQueryResult result) {
          this.result = result;
      }
  
      public KuzuGraphResult() {
          this.result = null;
      }
  
      @Override
      public boolean hasNext() {
          if (result == null) {
              return false;
          }
          try {
              boolean hasNext = result.hasNext();
              if (!hasNext) {
                  result.destroy();
              }
              return hasNext;
          } catch (Exception e) {
              e.printStackTrace();
              return false;
          }
      }
  
      @Override
      public Object next() {
          if (result == null) {
              return null;
          }
          try {
              KuzuFlatTuple tuple = result.getNext();
              String tupleString = tuple.toString();
              tuple.destroy();
              return tupleString;
          } catch (Exception e) {
              e.printStackTrace();
              return null;
          }
      }
  }
  