libtrilinos-teko-dev 12.12.1-5 / usr / include / trilinos / Teko_StridedMappingStrategy.hpp

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//      Teko: A package for block and physics based preconditioning
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#ifndef __Teko_StridedMappingStrategy_hpp__
#define __Teko_StridedMappingStrategy_hpp__

// stl includes
#include <vector>

// Teuchos includes
#include "Teuchos_RCP.hpp"

// Thyra includes
#include "Thyra_MultiVectorBase.hpp"
#include "Thyra_LinearOpBase.hpp"
#include "Thyra_BlockedLinearOpBase.hpp"

// Epetra includes
#include "Epetra_Comm.h"
#include "Epetra_Map.h"
#include "Epetra_MultiVector.h"
#include "Epetra_Import.h"
#include "Epetra_Export.h"
#include "Epetra_CrsMatrix.h"

// Teko includes
#include "Teko_EpetraOperatorWrapper.hpp"

namespace Teko {
namespace Epetra {

class StridedMappingStrategy : public MappingStrategy {
public:
   //! \name Constructors
   //@{

   /** Creates a strided mapping strategy. This class is useful
     * for breaking up nodally ordered matrices (i.e. the unknowns
     * in a FEM problem are ordered [u0,v0,p0,u1,v1,p1,...]). Current
     * implimentation only supports a fixed number of variables
     *
     * \param[in]      vars   Vector describing the blocking of variables
     * \param[in]      map    original Epetra_Map to be broken up
     * \param[in]      comm   Epetra_Comm object related to the map
     */
   StridedMappingStrategy(const std::vector<int> & vars,const Teuchos::RCP<const Epetra_Map> & map, const Epetra_Comm & comm);
   //@}

   //!\name Member functions inherited from Teko::Epetra::MappingStrategy
   //@{

   /** Virtual function defined in MappingStrategy.  This copies
     * an Epetra_MultiVector into a Thyra::MultiVectorBase with
     * blocking handled by the strides defined in the constructor.
     *
     * \param[in]     epetra_X  source Epetra_MultiVector
     * \param[in,out]     thyra_X   destination Thyra::MultiVectorBase
     */
   virtual void copyEpetraIntoThyra(const Epetra_MultiVector& epetra_X, 
                                    const Teuchos::Ptr<Thyra::MultiVectorBase<double> > & thyra_X) const;

   /** Virtual function defined in MappingStrategy.  This copies
     * an Epetra_MultiVector into a Thyra::MultiVectorBase with
     * blocking handled by the strides defined in the constructor.
     *
     * \param[in]     thyra_Y  source Thyra::MultiVectorBase
     * \param[in,out]     epetra_Y destination Epetra_MultiVector
     */
   virtual void copyThyraIntoEpetra(const Teuchos::RCP<const Thyra::MultiVectorBase<double> > & thyra_Y, 
                                    Epetra_MultiVector& epetra_Y) const;

   /** Returns the domain and range maps used by this class.
     * This faciliates building an Epetra_Operator around this
     * class with its core functionality being a Thyra::LinearOpBase
     * operator
     *
     * \returns Range map corresponding to this class
     */
   virtual const Teuchos::RCP<const Epetra_Map> domainMap() const
   { return domainMap_; }

   /** Returns the domain and range maps used by this class.
     * This faciliates building an Epetra_Operator around this
     * class with its core functionality being a Thyra::LinearOpBase
     * operator
     *
     * \returns Range map corresponding to this class
     */
   virtual const Teuchos::RCP<const Epetra_Map> rangeMap() const
   { return rangeMap_; }

   /** A function for my sanity
     *
     * \returns String with description of this class
     */
   virtual std::string toString() const
   { return std::string("StridedMappingStrategy"); }
 
   //@}

   //! \name Locally useful functions
   //@{

   /** \brief This is the core routine that builds the maps
     * and importers/exporters.
     *
     * This is the core routine that builds the maps
     * and importers/exporters neccessary for all the
     * transfers. Currently it simply calls out to the
     * interlaced epetra functions. (Comment: this
     * routine should probably be private or protected
     * ... it is basically the meat of the constructor)
     *
     * \param[in]      vars      Vector describing the blocking of variables
     * \param[in]      baseMap   basic map to use in the transfers
     * \param[in]      comm      Epetra_Comm object
     */
   void buildBlockTransferData(const std::vector<int> & vars,const Teuchos::RCP<const Epetra_Map> & baseMap, 
                               const Epetra_Comm & comm);

   /** \brief  Get the individual block maps underlying that
     * make up a strided vector/operator.
     *
     * Get the individual block maps underlying that
     * make up a strided vector/operator. These are
     * useful if you want to tear something ... i.e.
     * a matrix ... apart.
     *
     * \returns Return a vector of block maps 
     *             created for this strided operator 
     */
   const std::vector<std::pair<int,Teuchos::RCP<Epetra_Map> > > & getMaps() const
   { return blockMaps_; }

   /** Builds a blocked Thyra operator that uses the strided
     * mapping strategy to define sub blocks.
     *
     * \param[in] mat Epetra_CrsMatrix with FillComplete called, this
     *             matrix is assumed to be square, with the same
     *             range and domain maps
     * \param[in] label String to be used to prefix the sub block's labels
     *
     * \returns Blocked Thyra linear operator with sub blocks
     *          defined by this mapping strategy
     */
   const Teuchos::RCP<Thyra::BlockedLinearOpBase<double> > 
   buildBlockedThyraOp(const Teuchos::RCP<const Epetra_CrsMatrix> & mat,const std::string & label="<ANYM>") const;

   /** Rebuilds a block Thyra operator using the strided mapping
     * strategy to define sub blocks.
     *
     * \param[in] mat Epetra_CrsMatrix with FillComplete called, this
     *             matrix is assumed to be square, with the same
     *             range and domain maps
     * \param[in] A Destination block linear op composed of blocks of
     *            Epetra_CrsMatrix at all relevant locations
     */
   void rebuildBlockedThyraOp(const RCP<const Epetra_CrsMatrix> & mat,
                              const RCP<Thyra::BlockedLinearOpBase<double> > & A) const;

   //@}

protected:
   // member variables

   //! \name storage for sanity
   //@{
   Teuchos::RCP<const Epetra_Map> domainMap_; 
   Teuchos::RCP<const Epetra_Map> rangeMap_;
   //@}

   //! \name block transfer data
   //@{
   std::vector<std::pair<int,Teuchos::RCP<Epetra_Map> > > blockMaps_;
   std::vector<Teuchos::RCP<Epetra_Export> > blockExport_;
   std::vector<Teuchos::RCP<Epetra_Import> > blockImport_;
   //@}
};

} // end namespace Epetra
} // end namespace Teko

#endif