EpetraExt_Transform.h

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// ***********************************************************************
// 
//     EpetraExt: Epetra Extended - Linear Algebra Services Package
//                 Copyright (2001) Sandia Corporation
// 
// Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
// license for use of this work by or on behalf of the U.S. Government.
// 
// This library is free software; you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as
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//  
// This library is distributed in the hope that it will be useful, but
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.
//  
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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// Questions? Contact Michael A. Heroux (maherou@sandia.gov) 
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//-----------------------------------------------------------------------
// EpetraExt_Transform.h
//-----------------------------------------------------------------------

#ifndef EPETRAEXT_TRANSFORM_H
#define EPETRAEXT_TRANSFORM_H

#include <EpetraExt_ConfigDefs.h>

namespace EpetraExt {


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


  typedef T  OriginalType;
  typedef T* OriginalTypePtr;
  typedef T& OriginalTypeRef;

  typedef U  NewType;
  typedef U* NewTypePtr;
  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

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