types/operations/binary_operations/MultiplyBinaryOperation.hpp

/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 **/

#ifndef QUICKSTEP_TYPES_OPERATIONS_BINARY_OPERATIONS_MULTIPLY_BINARY_OPERATION_HPP_
#define QUICKSTEP_TYPES_OPERATIONS_BINARY_OPERATIONS_MULTIPLY_BINARY_OPERATION_HPP_

#include <utility>

#include "types/TypedValue.hpp"
#include "types/operations/binary_operations/ArithmeticBinaryOperation.hpp"
#include "types/operations/binary_operations/BinaryOperationID.hpp"
#include "utility/Macros.hpp"

namespace quickstep {

class Type;
class UncheckedBinaryOperator;

/** \addtogroup Types
 *  @{
 */

/**
 * @brief The BinaryOperation for multiplication.
 **/
class MultiplyBinaryOperation : public ArithmeticBinaryOperation {
 public:
  /**
   * @brief Get a reference to the singleton instance of this Operation.
   *
   * @return A reference to the singleton instance of this Operation.
   **/
  static const MultiplyBinaryOperation& Instance() {
    static MultiplyBinaryOperation instance;
    return instance;
  }

  bool isCommutative() const override {
    return true;
  }

  bool canApplyToTypes(const Type &left,
                       const Type &right) const override;

  const Type* resultTypeForArgumentTypes(const Type &left,
                                         const Type &right) const override;

  const Type* resultTypeForPartialArgumentTypes(const Type *left,
                                                const Type *right) const override;

  bool partialTypeSignatureIsPlausible(const Type *result_type,
                                       const Type *left_argument_type,
                                       const Type *right_argument_type) const override;

  std::pair<const Type*, const Type*> pushDownTypeHint(
      const Type *result_type_hint) const override;

  TypedValue applyToChecked(const TypedValue &left,
                            const Type &left_type,
                            const TypedValue &right,
                            const Type &right_type) const override;

  UncheckedBinaryOperator* makeUncheckedBinaryOperatorForTypes(const Type &left,
                                                               const Type &right) const override;

 private:
  MultiplyBinaryOperation()
      : ArithmeticBinaryOperation(BinaryOperationID::kMultiply) {
  }

  // NOTE(zuyu): left is an Interval TypedValue, either DatetimeInterval
  // or YearMonthInterval, while right is a Numeric.
  template <typename IntervalType>
  TypedValue applyToCheckedIntervalMultiplyNumericHelper(const TypedValue &left,
                                                         const Type &left_type,
                                                         const TypedValue &right,
                                                         const Type &right_type) const;

  DISALLOW_COPY_AND_ASSIGN(MultiplyBinaryOperation);
};

/** @} */

}  // namespace quickstep

#endif  // QUICKSTEP_TYPES_OPERATIONS_BINARY_OPERATIONS_MULTIPLY_BINARY_OPERATION_HPP_