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.common.ir.rel;
  
  import com.alibaba.graphscope.common.ir.rel.graph.*;
  import com.alibaba.graphscope.common.ir.rel.graph.match.GraphLogicalMultiMatch;
  import com.alibaba.graphscope.common.ir.rel.graph.match.GraphLogicalSingleMatch;
  
  import org.apache.calcite.rel.RelNode;
  import org.apache.calcite.rel.logical.LogicalFilter;
  import org.apache.calcite.rel.logical.LogicalJoin;
  
  /**
   * interface to visit each {@code RelNode}
   */
  public interface GraphRelShuttle {
      RelNode visit(GraphLogicalSource source);
  
      RelNode visit(GraphLogicalExpand expand);
  
      RelNode visit(GraphPhysicalExpand physicalExpand);
  
      RelNode visit(GraphLogicalGetV getV);
  
      RelNode visit(GraphLogicalPathExpand expand);
  
      RelNode visit(LogicalFilter filter);
  
      RelNode visit(GraphLogicalProject project);
  
      RelNode visit(GraphLogicalAggregate aggregate);
  
      RelNode visit(GraphLogicalSort sort);
  
      RelNode visit(GraphLogicalSingleMatch match);
  
      RelNode visit(GraphLogicalMultiMatch match);
  
      RelNode visit(LogicalJoin join);
  
      RelNode visit(GraphLogicalDedupBy dedupBy);
  }
  