MueLu_BlockedDirectSolver_def.hpp

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/*
 * MueLu_BlockedDirectSolver_def.hpp
 *
 *  Created on: 09.02.2014
 *      Author: tobias
 */

#ifndef MUELU_BLOCKEDDIRECTSOLVER_DEF_HPP_
#define MUELU_BLOCKEDDIRECTSOLVER_DEF_HPP_

#include "Teuchos_ArrayViewDecl.hpp"
#include "Teuchos_ScalarTraits.hpp"

#include "MueLu_ConfigDefs.hpp"

#include <Xpetra_Matrix.hpp>
#include <Xpetra_BlockedCrsMatrix.hpp>
#include <Xpetra_MultiVectorFactory.hpp>

#include "MueLu_BlockedDirectSolver.hpp"
#include "MueLu_MergedBlockedMatrixFactory.hpp"
#include "MueLu_Level.hpp"
#include "MueLu_Utilities.hpp"
#include "MueLu_Monitor.hpp"
#include "MueLu_HierarchyUtils.hpp"
#include "MueLu_SmootherBase.hpp"
#include "MueLu_DirectSolver.hpp"

namespace MueLu {

  template <class Scalar,class LocalOrdinal, class GlobalOrdinal, class Node>
  BlockedDirectSolver<Scalar, LocalOrdinal, GlobalOrdinal, Node>::BlockedDirectSolver()
    : type_("blocked direct solver")
  {
    MergedAFact_ = Teuchos::rcp(new MergedBlockedMatrixFactory());

    Teuchos::ParameterList params;
    s_ = Teuchos::rcp(new DirectSolver("", params));
  }

  template <class Scalar, class LocalOrdinal, class GlobalOrdinal, class Node>
  RCP<const ParameterList> BlockedDirectSolver<Scalar, LocalOrdinal, GlobalOrdinal, Node>::GetValidParameterList() const {
    RCP<ParameterList> validParamList = rcp(new ParameterList());

    validParamList->set< RCP<const FactoryBase> >("A", null, "Generating factory of the matrix A");

    return validParamList;
  }

  template <class Scalar,class LocalOrdinal, class GlobalOrdinal, class Node>
  void BlockedDirectSolver<Scalar, LocalOrdinal, GlobalOrdinal, Node>::DeclareInput(Level &currentLevel) const {
    // Note that we have a nested smoother/solver object (of type DirectSolver), so we have to declare the dependencies by hand
    // call DeclareInput by hand, since this->Input(currentLevel, "A") would not properly free A in the release mode (dependencies)
    // We need the blocked version of A as input for the MergedAFact_
    currentLevel.DeclareInput("A",this->GetFactory("A").get());

    // syncronize input factory for "A" and nested representation for "A"
    MergedAFact_->SetFactory("A", this->GetFactory("A"));

    // declare input factories for nested direct solver
    s_->SetFactory("A",MergedAFact_);
    s_->DeclareInput(currentLevel);
  }

  template <class Scalar,class LocalOrdinal, class GlobalOrdinal, class Node>
  void BlockedDirectSolver<Scalar, LocalOrdinal, GlobalOrdinal, Node>::Setup(Level &currentLevel) {
    RCP<Teuchos::FancyOStream> out = Teuchos::fancyOStream(Teuchos::rcpFromRef(std::cout));

    FactoryMonitor m(*this, "Setup BlockedDirectSolver", currentLevel);
    if (this->IsSetup() == true)
      this->GetOStream(Warnings0) << "MueLu::BlockedDirectSolver::Setup(): Setup() has already been called";

    // extract blocked operator A from current level
    A_ = Factory::Get< RCP<Matrix> >(currentLevel, "A"); // A needed for extracting map extractors
    RCP<BlockedCrsMatrix> bA = Teuchos::rcp_dynamic_cast<BlockedCrsMatrix>(A_);
    TEUCHOS_TEST_FOR_EXCEPTION(bA.is_null(), Exceptions::BadCast,
                               "MueLu::BlockedDirectSolver::Build: input matrix A is not of type BlockedCrsMatrix.");

    s_->Setup(currentLevel);

    this->IsSetup(true);
  }

  template <class Scalar,class LocalOrdinal, class GlobalOrdinal, class Node>
  void BlockedDirectSolver<Scalar, LocalOrdinal, GlobalOrdinal, Node>::Apply(MultiVector &X, const MultiVector& B, bool InitialGuessIsZero) const {
    TEUCHOS_TEST_FOR_EXCEPTION(this->IsSetup() == false, Exceptions::RuntimeError,
                               "MueLu::BlockedDirectSolver::Apply(): Setup() has not been called");

    RCP<MultiVector> rcpX = Teuchos::rcpFromRef(X);
    RCP<const MultiVector> rcpB = Teuchos::rcpFromRef(B);
    RCP<BlockedMultiVector> bX = Teuchos::rcp_dynamic_cast<BlockedMultiVector>(rcpX);
    RCP<const BlockedMultiVector> bB = Teuchos::rcp_dynamic_cast<const BlockedMultiVector>(rcpB);

#ifdef HAVE_MUELU_DEBUG
    RCP<BlockedCrsMatrix> bA = Teuchos::rcp_dynamic_cast<BlockedCrsMatrix>(A_);
    if(bB.is_null() == false) {
      //TEUCHOS_TEST_FOR_EXCEPTION(A_->getRangeMap()->isSameAs(*(B.getMap())) == false, Exceptions::RuntimeError, "MueLu::BlockedDirectSolver::Apply(): The map of RHS vector B is not the same as range map of the blocked operator A. Please check the map of B and A.");
    } else {
      TEUCHOS_TEST_FOR_EXCEPTION(bA->getFullRangeMap()->isSameAs(*(B.getMap())) == false, Exceptions::RuntimeError, "MueLu::BlockedDirectSolver::Apply(): The map of RHS vector B is not the same as range map of the blocked operator A. Please check the map of B and A.");
    }
    if(bX.is_null() == false) {
      //TEUCHOS_TEST_FOR_EXCEPTION(A_->getDomainMap()->isSameAs(*(X.getMap())) == false, Exceptions::RuntimeError, "MueLu::BlockedDirectSolver::Apply(): The map of the solution vector X is not the same as domain map of the blocked operator A. Please check the map of X and A.");
    } else {
      TEUCHOS_TEST_FOR_EXCEPTION(bA->getFullDomainMap()->isSameAs(*(X.getMap())) == false, Exceptions::RuntimeError, "MueLu::BlockedDirectSolver::Apply(): The map of the solution vector X is not the same as domain map of the blocked operator A. Please check the map of X and A.");
    }
#endif

    if (bB.is_null() == true && bX.is_null() == true) {
      // standard case (neither B nor X are blocked)
      s_->Apply(X, B, InitialGuessIsZero);
    } else if(bB.is_null() == false && bX.is_null() == false) {
      // both B and X are blocked
      RCP<MultiVector> mergedX = bX->Merge();
      RCP<const MultiVector> mergedB = bB->Merge();
      s_->Apply(*mergedX, *mergedB, InitialGuessIsZero);
      RCP<MultiVector> xx = Teuchos::rcp(new BlockedMultiVector(bX->getBlockedMap(),mergedX));
      SC zero = Teuchos::ScalarTraits<SC>::zero(), one = Teuchos::ScalarTraits<SC>::one();
      X.update(one,*xx,zero);
    } else if (bB.is_null() == true && bX.is_null() == false) {
      // the solution vector is blocked
      RCP<MultiVector> mergedX = bX->Merge();
      s_->Apply(*mergedX, B, InitialGuessIsZero);
      RCP<MultiVector> xx = Teuchos::rcp(new BlockedMultiVector(bX->getBlockedMap(),mergedX));
      SC zero = Teuchos::ScalarTraits<SC>::zero(), one = Teuchos::ScalarTraits<SC>::one();
      X.update(one,*xx,zero);
    } else if (bB.is_null() == false && bX.is_null() == true) {
      // only the RHS vector is blocked
      RCP<const MultiVector> mergedB = bB->Merge();
      s_->Apply(X, *mergedB, InitialGuessIsZero);
    }
  }

  template <class Scalar,class LocalOrdinal, class GlobalOrdinal, class Node>
  RCP<MueLu::SmootherPrototype<Scalar, LocalOrdinal, GlobalOrdinal, Node> >
  BlockedDirectSolver<Scalar, LocalOrdinal, GlobalOrdinal, Node>::Copy() const {
    return rcp (new BlockedDirectSolver (*this));
  }

  template <class Scalar,class LocalOrdinal, class GlobalOrdinal, class Node>
  std::string BlockedDirectSolver<Scalar, LocalOrdinal, GlobalOrdinal, Node>::description() const {
    std::ostringstream out;
    out << SmootherPrototype::description();
    out << "{type = " << type_ << "}";
    return out.str();
  }

  template <class Scalar,class LocalOrdinal, class GlobalOrdinal, class Node>
  void BlockedDirectSolver<Scalar, LocalOrdinal, GlobalOrdinal, Node>::print(Teuchos::FancyOStream &out, const VerbLevel verbLevel) const {
    MUELU_DESCRIBE;

    if (verbLevel & Parameters0)
      out0 << "Prec. type: " << type_ << std::endl;

    if (verbLevel & Debug)
      out0 << "IsSetup: " << Teuchos::toString(SmootherPrototype::IsSetup()) << std::endl;
  }

  template <class Scalar,class LocalOrdinal, class GlobalOrdinal, class Node>
  size_t BlockedDirectSolver<Scalar, LocalOrdinal, GlobalOrdinal, Node>::getNodeSmootherComplexity() const {
    // FIXME: This is a placeholder
    return Teuchos::OrdinalTraits<size_t>::invalid();
  }
  

} // namespace MueLu



#endif /* MUELU_BLOCKEDDIRECTSOLVER_DEF_HPP_ */