EpetraExt_ProductOperator.h

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#ifndef EPETRAEXT_PRODUCT_OPERATOR_H
#define EPETRAEXT_PRODUCT_OPERATOR_H

#include "Epetra_Operator.h"
#include "Teuchos_RefCountPtr.hpp"
#include "Teuchos_BLAS_types.hpp"

class Epetra_Vector;

namespace EpetraExt {

class ProductOperator : public Epetra_Operator {
public:


  enum EApplyMode { APPLY_MODE_APPLY, APPLY_MODE_APPLY_INVERSE };



  ProductOperator();

  ProductOperator(
    const int                                            num_Op
    ,const Teuchos::RefCountPtr<const Epetra_Operator>   Op[]
    ,const Teuchos::ETransp                              Op_trans[]
    ,const EApplyMode                                    Op_inverse[]
    );

  void initialize(
    const int                                            num_Op
    ,const Teuchos::RefCountPtr<const Epetra_Operator>   Op[]
    ,const Teuchos::ETransp                              Op_trans[]
    ,const EApplyMode                                    Op_inverse[]
    );

  void uninitialize(
    int                                            *num_Op
    ,Teuchos::RefCountPtr<const Epetra_Operator>   Op[]
    ,Teuchos::ETransp                              Op_trans[]
    ,EApplyMode                                    p_inverse[]
    );

  void applyConstituent(
    const int                  k
    ,Teuchos::ETransp          Op_trans
    ,EApplyMode                Op_inverse
    ,const Epetra_MultiVector  &X_k
    ,Epetra_MultiVector        *Y_k
    ) const;

  int num_Op() const;

  Teuchos::RefCountPtr<const Epetra_Operator> Op(int k) const;

  Teuchos::ETransp Op_trans(int k) const;

  EApplyMode Op_inverse(int k) const;


  
  int SetUseTranspose(bool UseTranspose);
  int Apply(const Epetra_MultiVector& X, Epetra_MultiVector& Y) const;
  int ApplyInverse(const Epetra_MultiVector& X, Epetra_MultiVector& Y) const;
  double NormInf() const;
  const char * Label() const;
  bool UseTranspose() const;
  bool HasNormInf() const;
  const Epetra_Comm & Comm() const;
  const Epetra_Map & OperatorDomainMap() const;
  const Epetra_Map & OperatorRangeMap() const;


private:

  // ////////////////////////////
  // Private types

  typedef std::vector<Teuchos::RefCountPtr<const Epetra_Operator> >  Op_t;
  typedef std::vector<Teuchos::ETransp>                        Op_trans_t;
  typedef std::vector<EApplyMode>                              Op_inverse_t;
  typedef std::vector<Teuchos::RefCountPtr<Epetra_Vector> >    EV_t;

  // ////////////////////////////
  // Private data members

  bool          UseTranspose_;
  Op_t          Op_;
  Op_trans_t    Op_trans_;
  Op_inverse_t  Op_inverse_;

  mutable EV_t  range_vecs_;
  mutable EV_t  domain_vecs_;

  // ////////////////////////////
  // Private member functions

  void assertInitialized() const;
  void validateIndex(int k) const;
  void initializeTempVecs(bool applyInverse) const;

}; // class ProductOperator

// ////////////////////////////
// Inline members

// public

inline
int ProductOperator::num_Op() const
{
  return Op_.size();
}

inline
Teuchos::RefCountPtr<const Epetra_Operator>
ProductOperator::Op(int k) const
{
  validateIndex(k);
  return Op_[k];
}

inline
Teuchos::ETransp
ProductOperator::Op_trans(int k) const
{
  validateIndex(k);
  return Op_trans_[k];
}

inline
ProductOperator::EApplyMode
ProductOperator::Op_inverse(int k) const
{
  validateIndex(k);
  return Op_inverse_[k];
}


// private

inline
void ProductOperator::assertInitialized() const
{
  TEUCHOS_TEST_FOR_EXCEPTION(
    Op_.size()==0, std::logic_error
    ,"Epetra::ProductOperator: Error, Client has not called initialize(...) yet!"
    );
}

inline
void ProductOperator::validateIndex(int k) const
{
  TEUCHOS_TEST_FOR_EXCEPTION(
    k < 0 || static_cast<int>(Op_.size())-1 < k, std::logic_error
    ,"Epetra::ProductOperator: Error, k = "<<k<< " is not in the range [0,"<<Op_.size()-1<<"]!"
    );
}

} // namespace EpetraExt

#endif // EPETRAEXT_PRODUCT_OPERATOR_H