// Created on: 1991-01-10
// Created by: Arnaud BOUZY
// Copyright (c) 1991-1999 Matra Datavision
// Copyright (c) 1999-2014 OPEN CASCADE SAS
//
// This file is part of Open CASCADE Technology software library.
//
// This library is free software; you can redistribute it and/or modify it under
// the terms of the GNU Lesser General Public License version 2.1 as published
// by the Free Software Foundation, with special exception defined in the file
// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
// distribution for complete text of the license and disclaimer of any warranty.
//
// Alternatively, this file may be used under the terms of Open CASCADE
// commercial license or contractual agreement.

#ifndef _Expr_BinaryExpression_HeaderFile
#define _Expr_BinaryExpression_HeaderFile

#include "Standard.hxx"
#include "Standard_Type.hxx"

#include "Expr_GeneralExpression.hxx"
#include "Standard_Integer.hxx"
class Expr_NamedUnknown;

//! Defines all binary expressions. The order of the two
//! operands is significant.
class Expr_BinaryExpression : public Expr_GeneralExpression
{

public:
  const occ::handle<Expr_GeneralExpression>& FirstOperand() const;

  const occ::handle<Expr_GeneralExpression>& SecondOperand() const;

  //! Sets first operand of <me>
  //! Raises InvalidOperand if exp = me
  Standard_EXPORT void SetFirstOperand(const occ::handle<Expr_GeneralExpression>& exp);

  //! Sets second operand of <me>
  //! Raises InvalidOperand if <exp> contains <me>.
  Standard_EXPORT void SetSecondOperand(const occ::handle<Expr_GeneralExpression>& exp);

  //! returns the number of sub-expressions contained
  //! in <me> ( >= 0)
  Standard_EXPORT int NbSubExpressions() const override;

  //! returns the <I>-th sub-expression of <me>
  //! raises OutOfRange if <I> > NbSubExpressions(me)
  Standard_EXPORT const occ::handle<Expr_GeneralExpression>& SubExpression(
    const int I) const override;

  //! Does <me> contain NamedUnknown ?
  Standard_EXPORT bool ContainsUnknowns() const override;

  //! Tests if <me> contains <exp>.
  Standard_EXPORT bool Contains(const occ::handle<Expr_GeneralExpression>& exp) const override;

  //! Replaces all occurrences of <var> with <with> in <me>.
  //! Raises InvalidOperand if <with> contains <me>.
  Standard_EXPORT void Replace(const occ::handle<Expr_NamedUnknown>&      var,
                               const occ::handle<Expr_GeneralExpression>& with) override;

  //! Returns a GeneralExpression after replacement of
  //! NamedUnknowns by an associated expression and after
  //! values computation.
  Standard_EXPORT occ::handle<Expr_GeneralExpression> Simplified() const override;

  DEFINE_STANDARD_RTTIEXT(Expr_BinaryExpression, Expr_GeneralExpression)

protected:
  //! Sets first operand of <me>
  Standard_EXPORT void CreateFirstOperand(const occ::handle<Expr_GeneralExpression>& exp);

  //! Sets second operand of <me>
  //! Raises InvalidOperand if <exp> contains <me>.
  Standard_EXPORT void CreateSecondOperand(const occ::handle<Expr_GeneralExpression>& exp);

private:
  occ::handle<Expr_GeneralExpression> myFirstOperand;
  occ::handle<Expr_GeneralExpression> mySecondOperand;
};

#include "Expr_BinaryExpression.lxx"

#endif // _Expr_BinaryExpression_HeaderFile