/**
 * Copyright (c) 2021 OceanBase
 * OceanBase CE is licensed under Mulan PubL v2.
 * You can use this software according to the terms and conditions of the Mulan PubL v2.
 * You may obtain a copy of Mulan PubL v2 at:
 *          http://license.coscl.org.cn/MulanPubL-2.0
 * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
 * EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
 * MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
 * See the Mulan PubL v2 for more details.
 */

#ifndef _OB_EXPR_TO_TYPE_H_
#define _OB_EXPR_TO_TYPE_H_

#include "share/object/ob_obj_cast.h"
#include "sql/engine/expr/ob_expr_operator.h"

namespace oceanbase {
namespace sql {

class ObExprToType : public ObFuncExprOperator {
  OB_UNIS_VERSION_V(1);

public:
  ObExprToType();
  explicit ObExprToType(common::ObIAllocator& alloc);
  virtual ~ObExprToType(){};

  virtual int calc_result_type1(ObExprResType& type, ObExprResType& type1, common::ObExprTypeCtx& type_ctx) const;

  virtual int calc_result1(common::ObObj& result, const common::ObObj& obj1, common::ObExprCtx& expr_ctx) const;
  virtual int assign(const ObExprOperator& other);
  virtual int cg_expr(ObExprCGCtx& expr_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const;

public:
  OB_INLINE void set_expect_type(common::ObObjType expect_type)
  {
    expect_type_ = expect_type;
  }
  OB_INLINE void set_cast_mode(common::ObCastMode cast_mode)
  {
    cast_mode_ = cast_mode;
  }

private:
  int calc_result_type_for_literal(ObExprResType& type, ObExprResType& type1, common::ObExprTypeCtx& type_ctx) const;
  int calc_result_type_for_column(ObExprResType& type, ObExprResType& type1, common::ObExprTypeCtx& type_ctx) const;

private:
  // data members
  common::ObObjType expect_type_;
  common::ObCastMode cast_mode_;
  // disallow copy
  DISALLOW_COPY_AND_ASSIGN(ObExprToType);
};

}  // namespace sql
}  // namespace oceanbase
#endif /* _OB_EXPR_TO_TYPE_H_ */
