MueLu_TrilinosSmoother_decl.hpp

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#ifndef MUELU_TRILINOSSMOOTHER_DECL_HPP
#define MUELU_TRILINOSSMOOTHER_DECL_HPP

#include <Teuchos_ParameterList.hpp>

#include <Xpetra_Matrix_fwd.hpp>

#include "MueLu_ConfigDefs.hpp"
#include "MueLu_TrilinosSmoother_fwd.hpp"
#include "MueLu_SmootherPrototype.hpp"

#include "MueLu_FactoryBase_fwd.hpp"
#include "MueLu_IfpackSmoother_fwd.hpp"

#if defined(HAVE_MUELU_IFPACK2)
#include "MueLu_Ifpack2Smoother_fwd.hpp"
#include "MueLu_Ifpack2Smoother.hpp"
#endif

// Note: TrilinosSmoother is a SmootherPrototype that cannot be turned into a smoother using Setup().
//       When this prototype is cloned using Copy(), the clone is an Ifpack or an Ifpack2 smoother.
//       The clone can be used as a smoother after calling Setup().

namespace MueLu {

  template <class Scalar = SmootherPrototype<>::scalar_type,
            class LocalOrdinal = typename SmootherPrototype<Scalar>::local_ordinal_type,
            class GlobalOrdinal = typename SmootherPrototype<Scalar, LocalOrdinal>::global_ordinal_type,
            class Node = typename SmootherPrototype<Scalar, LocalOrdinal, GlobalOrdinal>::node_type>
  class TrilinosSmoother : public SmootherPrototype<Scalar,LocalOrdinal,GlobalOrdinal,Node> {
#undef MUELU_TRILINOSSMOOTHER_SHORT
#include "MueLu_UseShortNames.hpp"

  public:



    TrilinosSmoother(const std::string& type = "", const Teuchos::ParameterList& paramList = Teuchos::ParameterList(), const LO& overlap = 0);

    virtual ~TrilinosSmoother() { }




    void DeclareInput(Level& currentLevel) const;




    void Setup(Level& currentLevel);

    void Apply(MultiVector& X, const MultiVector& B, bool InitialGuessIsZero = false) const;


    void SetFactory(const std::string& varName, const RCP<const FactoryBase>& factory);

    RCP<SmootherPrototype> Copy() const;

#ifndef _MSC_VER
    template<class Scalar2, class LocalOrdinal2, class GlobalOrdinal2, class Node2>
    friend class TrilinosSmoother;
#endif

#ifdef HAVE_MUELU_DEPRECATED_CODE
    template<typename Node2>    
    RCP<MueLu::TrilinosSmoother<Scalar,LocalOrdinal,GlobalOrdinal,Node2> > 
    MUELU_DEPRECATED
    clone(const RCP<Node2>& node2, const Teuchos::RCP<const Xpetra::Matrix<Scalar,LocalOrdinal,GlobalOrdinal,Node2> >& A_newnode) const;
#endif

    // As a temporary solution.
    // See https://software.sandia.gov/bugzilla/show_bug.cgi?id=5283#c5 for what I proposed to do
    static std::string Ifpack2ToIfpack1Type(const std::string& type);

    // As a temporary solution.
    // See https://software.sandia.gov/bugzilla/show_bug.cgi?id=5283#c5 for what I proposed to do
    /* TODO:
      ifpackList.set("type", "Chebyshev");
      ifpackList.set("chebyshev: degree", (int) 1);
      ifpackList.set("chebyshev: max eigenvalue", (double) 2.0);
      ifpackList.set("chebyshev: min eigenvalue", (double) 1.0);
      ifpackList.set("chebyshev: zero starting solution", false);
    */
    static Teuchos::ParameterList Ifpack2ToIfpack1Param(const Teuchos::ParameterList& ifpack2List);



    std::string description() const;

    //using MueLu::Describable::describe; // overloading, not hiding
    //void describe(Teuchos::FancyOStream &out, const VerbLevel verbLevel = Default) const {
    void print(Teuchos::FancyOStream& out, const VerbLevel verbLevel = Default) const;

    RCP<SmootherPrototype> getSmoother() {return s_;}

    size_t getNodeSmootherComplexity() const {return s_->getNodeSmootherComplexity();}


  private:

    std::string type_;

    LO overlap_;

    RCP<FactoryBase> AFact_;

    //
    // Underlying Smoother
    //

    RCP<SmootherPrototype> sEpetra_, sTpetra_;
    mutable
      RCP<SmootherPrototype> s_;

    // Records for the case if something goes wrong
    bool        triedEpetra_, triedTpetra_;
    std::string errorEpetra_, errorTpetra_;

  }; // class TrilinosSmoother

#ifdef HAVE_MUELU_DEPRECATED_CODE
  template<class Scalar, class LocalOrdinal, class GlobalOrdinal, class Node>
  template<typename Node2>
  MUELU_DEPRECATED
  Teuchos::RCP<MueLu::TrilinosSmoother<Scalar,LocalOrdinal,GlobalOrdinal,Node2> >
  TrilinosSmoother<Scalar,LocalOrdinal,GlobalOrdinal,Node>::clone(const RCP<Node2>& node2, const Teuchos::RCP<const Xpetra::Matrix<Scalar,LocalOrdinal,GlobalOrdinal,Node2> >& A_newnode) const {
#if defined(HAVE_MUELU_IFPACK2)
    RCP<TrilinosSmoother<Scalar, LocalOrdinal, GlobalOrdinal, Node2> > cloneSmoother =
        rcp(new TrilinosSmoother<Scalar, LocalOrdinal, GlobalOrdinal, Node2>(type_, this->GetParameterList(), overlap_));
    Teuchos::RCP<MueLu::SmootherBase<Scalar, LocalOrdinal, GlobalOrdinal, Node2> >  cloneSB;

    Teuchos::RCP<MueLu::Ifpack2Smoother<Scalar, LocalOrdinal, GlobalOrdinal, Node> > ifpack2Smoother =
        Teuchos::rcp_dynamic_cast<MueLu::Ifpack2Smoother<Scalar, LocalOrdinal, GlobalOrdinal, Node> >(this->s_);
    if (ifpack2Smoother != Teuchos::null){
      cloneSB = ifpack2Smoother->template clone<Node2>(node2, A_newnode);
    }
    else {
      TEUCHOS_TEST_FOR_EXCEPTION(
          true, std::invalid_argument, "MueLu::TrilinosSmoother: "
          "Invalid smoother type to clone (not type Ifpack2)\"");
    }
    RCP<MueLu::SmootherPrototype<Scalar, LocalOrdinal, GlobalOrdinal, Node2> > clonedProto =
        Teuchos::rcp_dynamic_cast<MueLu::SmootherPrototype<Scalar, LocalOrdinal, GlobalOrdinal, Node2>  >(cloneSB);
    cloneSmoother->s_ = clonedProto;
    cloneSmoother->IsSetup(true);
    return cloneSmoother;
#else
  TEUCHOS_TEST_FOR_EXCEPTION(
      true, std::invalid_argument, "MueLu::SmootherClone: "
      "clone() only available with IFPACK2 enabled.");
#endif
  }
#endif

} // namespace MueLu

#define MUELU_TRILINOSSMOOTHER_SHORT
#endif // MUELU_TRILINOSSMOOTHER_DECL_HPP