Xpetra_EpetraOperator.hpp

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#ifndef XPETRA_EPETRAOPERATOR_HPP
#define XPETRA_EPETRAOPERATOR_HPP

#include "Xpetra_EpetraConfigDefs.hpp"

#include <Epetra_Operator.h>
#include <Epetra_Map.h>

#include "Xpetra_Map.hpp"
#include "Xpetra_EpetraMap.hpp"
#include "Xpetra_MultiVector.hpp"
#include "Xpetra_EpetraMultiVector.hpp"
#include "Xpetra_Operator.hpp"

#include "Xpetra_Utils.hpp"

namespace Xpetra {

  template<class EpetraGlobalOrdinal, class Node>
  class EpetraOperator : public Operator<double, int, EpetraGlobalOrdinal,Node>
  {
    typedef double                Scalar;
    typedef int                   LocalOrdinal;
    typedef EpetraGlobalOrdinal   GlobalOrdinal;

  public:


    virtual Teuchos::RCP<const Xpetra::Map<LocalOrdinal,GlobalOrdinal,Node> > getDomainMap() const 
    {
      XPETRA_MONITOR("EpetraOperator::getDomainMap()");
      return toXpetra<GlobalOrdinal,Node>(op_->OperatorDomainMap());
    }


    virtual Teuchos::RCP<const Xpetra::Map<LocalOrdinal,GlobalOrdinal,Node> > getRangeMap() const 
    {
      XPETRA_MONITOR("EpetraOperator::getRangeMap()");
      return toXpetra<GlobalOrdinal,Node>(op_->OperatorRangeMap());
    }



    virtual void
    apply (const MultiVector<Scalar,LocalOrdinal,GlobalOrdinal,Node> &X,
           MultiVector<Scalar,LocalOrdinal,GlobalOrdinal,Node> &Y,
           Teuchos::ETransp mode = Teuchos::NO_TRANS,
           Scalar alpha = Teuchos::ScalarTraits<Scalar>::one(),
           Scalar beta = Teuchos::ScalarTraits<Scalar>::zero()) const 
    {
      XPETRA_MONITOR("EpetraOperator::apply");

      XPETRA_DYNAMIC_CAST(const EpetraMultiVectorT<GlobalOrdinal XPETRA_COMMA Node>, X, eX, "Xpetra::EpetraOperator->apply(): cannot cast input to Xpetra::EpetraMultiVectorT");
      XPETRA_DYNAMIC_CAST(      EpetraMultiVectorT<GlobalOrdinal XPETRA_COMMA Node>, Y, eY, "Xpetra::EpetraOperator->apply(): cannot cast input to Xpetra::EpetraMultiVectorT");

      TEUCHOS_TEST_FOR_EXCEPTION((mode != Teuchos::NO_TRANS) && (mode != Teuchos::TRANS), Exceptions::NotImplemented,
                                 "Xpetra::EpetraOperator->apply(): can only accept mode == NO_TRANS or mode == TRANS");
      TEUCHOS_TEST_FOR_EXCEPTION(mode == Teuchos::TRANS && !hasTransposeApply(), Exceptions::RuntimeError,
                                 "Xpetra::EpetraOperator->apply(): cannot apply transpose as underlying Epetra operator does not support it");

      // Helper vector for string A*X
      RCP<Epetra_MultiVector> epY = eY.getEpetra_MultiVector();
      RCP<Epetra_MultiVector> tmp = Teuchos::rcp(new Epetra_MultiVector(*epY));
      tmp->PutScalar(0.0);

      op_->SetUseTranspose(mode == Teuchos::TRANS);
      XPETRA_ERR_CHECK(op_->Apply(*eX.getEpetra_MultiVector(), *tmp));

      // calculate alpha * A * x + beta * y
      XPETRA_ERR_CHECK(eY.getEpetra_MultiVector()->Update(alpha, *tmp, beta));
    }


    virtual bool hasTransposeApply() const 
    {
      // We do not currently use transpose, try setting it
      int err = op_->SetUseTranspose(true);
      op_->SetUseTranspose(false);
      return (err == 0);
    }




    std::string description() const { XPETRA_MONITOR("EpetraOperator::description"); return "Epetra_Operator"; }

    void describe(Teuchos::FancyOStream &out, const Teuchos::EVerbosityLevel verbLevel=Teuchos::Describable::verbLevel_default) const 
    {
      XPETRA_MONITOR("EpetraOperator::describe");
      out << "Epetra_Operator" << std::endl;
    }




    EpetraOperator(const Teuchos::RCP<Epetra_Operator> &op) : op_(op) { } //TODO removed const

    void residual(const MultiVector< Scalar, LocalOrdinal, GlobalOrdinal, Node > & X,
                  const MultiVector< Scalar, LocalOrdinal, GlobalOrdinal, Node > & B,
                  MultiVector< Scalar, LocalOrdinal, GlobalOrdinal, Node > & R) const {
      using STS = Teuchos::ScalarTraits<Scalar>;
      R.update(STS::one(),B,STS::zero());
      this->apply (X, R, Teuchos::NO_TRANS, -STS::one(), STS::one());   
    }
    

  private:
    RCP< Epetra_Operator> op_;

  }; // TpetraOperator class


} // Xpetra namespace

#endif // XPETRA_EPETRAOPERATOR_HPP