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 com.alibaba.graphscope.common.ir.tools.GraphBuilder;
  
  import org.apache.calcite.rex.*;
  
  import java.util.ArrayList;
  import java.util.List;
  
  // build from RexTmpVariable to RexGraphVariable
  public class RexTmpVariableConverter extends RexVisitorImpl<RexNode> {
      private final GraphBuilder builder;
  
      public RexTmpVariableConverter(boolean deep, GraphBuilder builder) {
          super(deep);
          this.builder = builder;
      }
  
      @Override
      public RexNode visitCall(RexCall call) {
          if (!this.deep) {
              return null;
          } else {
              List<RexNode> results = new ArrayList<>();
              for (RexNode operand : call.getOperands()) {
                  results.add(operand.accept(this));
              }
              return builder.call(call.getOperator(), results);
          }
      }
  
      @Override
      public RexNode visitLiteral(RexLiteral literal) {
          return literal;
      }
  
      @Override
      public RexNode visitInputRef(RexInputRef inputRef) {
          return (inputRef instanceof RexTmpVariable)
                  ? visitTmpVariable((RexTmpVariable) inputRef)
                  : inputRef;
      }
  
      public RexNode visitTmpVariable(RexTmpVariable tmpVar) {
          return (tmpVar.getProperty() == null)
                  ? builder.variable(tmpVar.getAlias())
                  : builder.variable(tmpVar.getAlias(), tmpVar.getProperty());
      }
  
      @Override
      public RexNode visitDynamicParam(RexDynamicParam dynamicParam) {
          return dynamicParam;
      }
  }
  