// Created on: 1991-06-13
// 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.


#include <Expr.hxx>
#include <Expr_GeneralExpression.hxx>
#include <Expr_GeneralRelation.hxx>
#include <Expr_LessThan.hxx>
#include <Expr_NumericValue.hxx>
#include <Standard_NumericError.hxx>
#include <Standard_Type.hxx>
#include <TCollection_AsciiString.hxx>

IMPLEMENT_STANDARD_RTTIEXT(Expr_LessThan,Expr_SingleRelation)

Expr_LessThan::Expr_LessThan (const Handle(Expr_GeneralExpression)& exp1, const Handle(Expr_GeneralExpression)& exp2)
{
  SetFirstMember(exp1);
  SetSecondMember(exp2);
}

Standard_Boolean Expr_LessThan::IsSatisfied () const
{
  Handle(Expr_GeneralExpression) fm = FirstMember();
  Handle(Expr_GeneralExpression) sm = SecondMember();
  fm = fm->Simplified();
  sm = sm->Simplified();
  if (fm->IsKind(STANDARD_TYPE(Expr_NumericValue))) {
    if (sm->IsKind(STANDARD_TYPE(Expr_NumericValue))) {
      Handle(Expr_NumericValue) nfm = Handle(Expr_NumericValue)::DownCast(fm);
      Handle(Expr_NumericValue) nsm = Handle(Expr_NumericValue)::DownCast(sm);
      return (nfm->GetValue() < nsm->GetValue());
    }
  }
  return Standard_False;
}

Handle(Expr_GeneralRelation) Expr_LessThan::Simplified () const
{
  Handle(Expr_GeneralExpression) fm = FirstMember();
  Handle(Expr_GeneralExpression) sm = SecondMember();
  return new Expr_LessThan(fm->Simplified(),sm->Simplified());
}

void Expr_LessThan::Simplify ()
{
  Handle(Expr_GeneralExpression) fm = FirstMember();
  Handle(Expr_GeneralExpression) sm = SecondMember();
  SetFirstMember(fm->Simplified());
  SetSecondMember(sm->Simplified());
}

Handle(Expr_GeneralRelation) Expr_LessThan::Copy () const
{
  return new Expr_LessThan(Expr::CopyShare(FirstMember()),
			   Expr::CopyShare(SecondMember()));
}

TCollection_AsciiString Expr_LessThan::String() const
{
  return FirstMember()->String() + " < " + SecondMember()->String();
}