EpetraExt_Transform.h

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//-----------------------------------------------------------------------
// EpetraExt_Transform.h
//-----------------------------------------------------------------------
 
#ifndef EPETRAEXT_TRANSFORM_H
#define EPETRAEXT_TRANSFORM_H
 
#include <EpetraExt_ConfigDefs.h>
 
#include <Teuchos_RCP.hpp>
 
namespace EpetraExt {


 
template<typename T, typename U>
class Transform
{
 public:

 
  typedef T  OriginalType;
  typedef T* OriginalTypePtr;
  typedef Teuchos::RCP<T> OriginalTypeRCP;
  typedef T& OriginalTypeRef;
 
  typedef U  NewType;
  typedef U* NewTypePtr;
  typedef Teuchos::RCP<U> NewTypeRCP;
  typedef U& NewTypeRef;


  virtual ~Transform() {}



  virtual NewTypeRef operator()( OriginalTypeRef orig ) = 0;


  virtual bool fwd() = 0;


  virtual bool rvs() = 0;




  virtual bool analyze( OriginalTypeRef orig );


  virtual NewTypeRef construct();


  virtual bool isConstructed();

 
 protected:


  Transform()
  : origObj_(0),
    newObj_(0)
  {}
 
  OriginalTypePtr origObj_;
 
  NewTypePtr      newObj_;
 
 private:
  Transform(const Transform<T,U>& src)
    :origObj_(src.origObj_), newObj_(src.newObj_) {}
 
  Transform<T,U>& operator=(const Transform<T,U>& src)
    {
      //not currently supported
      abort();
      return(*this);
    }
 
}; // end class Transform
 
template<typename T,typename U>
bool
Transform<T,U>::
analyze( OriginalTypeRef orig )
{
  origObj_ = &orig;
  newObj_ = &((*this)( *origObj_ ));
  return true;
}
 
template<typename T,typename U>
typename Transform<T,U>::NewTypeRef
Transform<T,U>::
construct()
{
  return *newObj_;
}
 
template<typename T,typename U>
bool
Transform<T,U>::
isConstructed()
{
  return ( newObj_ != 0 );
}
 
template<typename T, typename U>
class StructuralTransform : public Transform<T,U>
{
 public:
  bool fwd() { return true; }
  bool rvs() { return true; }
 
  virtual ~StructuralTransform() {}
};
 
template<typename T>
class SameTypeTransform : public Transform<T,T>
{
 public:
  typedef T  TransformType;
  typedef T* TransformTypePtr;
  typedef T& TransformTypeRef;
 
  virtual ~SameTypeTransform() {}
};
 
template<typename T>
class StructuralSameTypeTransform : public SameTypeTransform<T>
{
 public:
  bool fwd() { return true; }
  bool rvs() { return true; }
 
  virtual ~StructuralSameTypeTransform() {}
};
 
template<typename T>
class InPlaceTransform : public SameTypeTransform<T>
{
 public:
  typename Transform<T,T>::NewTypeRef
  operator()
  ( typename Transform<T,T>::OriginalTypeRef orig )
  { this->origObj_ = &orig;
    this->newObj_ = &orig;
    return orig;
  }
 
  virtual ~InPlaceTransform() {}
};
 
template<typename T>
class ViewTransform : public SameTypeTransform<T>
{
 public:
  bool fwd() { return true; }
  bool rvs() { return true; }
 
  virtual ~ViewTransform() {}
};
 
} //namespace EpetraExt
  
#endif //EPETRAEXT_TRANSFORM_H