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.rex;
  
  import org.apache.calcite.rex.RexInputRef;
  import org.apache.calcite.rex.RexNode;
  import org.apache.calcite.rex.RexVisitor;
  import org.apache.calcite.rex.RexVisitorImpl;
  
  public class RexConverterAdaptor extends RexVisitorImpl<RexNode> {
      private final RexVisitor<RexNode> convertor;
  
      public RexConverterAdaptor(boolean deep, RexVisitor<RexNode> convertor) {
          super(deep);
          this.convertor = convertor;
      }
  
      @Override
      public RexNode visitInputRef(RexInputRef inputRef) {
          if (inputRef instanceof RexGraphVariable) {
              return visitGraphVariable((RexGraphVariable) inputRef);
          } else {
              return convertor.visitInputRef(inputRef);
          }
      }
  
      private RexNode visitGraphVariable(RexGraphVariable variable) {
          RexInputRef original = (RexInputRef) convertor.visitInputRef(variable);
          return variable.getProperty() == null
                  ? RexGraphVariable.of(
                          variable.getAliasId(),
                          original.getIndex(),
                          variable.getName(),
                          variable.getType())
                  : RexGraphVariable.of(
                          variable.getAliasId(),
                          variable.getProperty(),
                          original.getIndex(),
                          variable.getName(),
                          variable.getType());
      }
  }
  