MueLu_MultiVectorTransferFactory_def.hpp

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// @HEADER
// *****************************************************************************
//        MueLu: A package for multigrid based preconditioning
//
// Copyright 2012 NTESS and the MueLu contributors.
// SPDX-License-Identifier: BSD-3-Clause
// *****************************************************************************
// @HEADER

#ifndef MUELU_MULTIVECTORTRANSFER_FACTORY_DEF_HPP
#define MUELU_MULTIVECTORTRANSFER_FACTORY_DEF_HPP

#include "MueLu_MultiVectorTransferFactory_decl.hpp"
#include "Xpetra_MultiVectorFactory.hpp"

#include "MueLu_Level.hpp"
#include "MueLu_Monitor.hpp"

namespace MueLu {

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

  validParamList->set<std::string>("Vector name", "undefined", "Name of the vector that will be transferred on the coarse grid (level key)");  // TODO: how to set a validator without default value?
  validParamList->set<RCP<const FactoryBase> >("Vector factory", Teuchos::null, "Factory of the vector");
  validParamList->set<RCP<const FactoryBase> >("R", Teuchos::null, "Factory of the transfer operator (restriction)");

  return validParamList;
}

template <class Scalar, class LocalOrdinal, class GlobalOrdinal, class Node>
MultiVectorTransferFactory<Scalar, LocalOrdinal, GlobalOrdinal, Node>::MultiVectorTransferFactory(std::string const &vectorName) {
  SetParameter("Vector name", ParameterEntry(vectorName));
}

template <class Scalar, class LocalOrdinal, class GlobalOrdinal, class Node>
void MultiVectorTransferFactory<Scalar, LocalOrdinal, GlobalOrdinal, Node>::DeclareInput(Level &fineLevel, Level &coarseLevel) const {
  const ParameterList &pL = GetParameterList();
  std::string vectorName  = pL.get<std::string>("Vector name");

  fineLevel.DeclareInput(vectorName, GetFactory("Vector factory").get(), this);
  Input(coarseLevel, "R");
}

template <class Scalar, class LocalOrdinal, class GlobalOrdinal, class Node>
void MultiVectorTransferFactory<Scalar, LocalOrdinal, GlobalOrdinal, Node>::Build(Level &fineLevel, Level &coarseLevel) const {
  FactoryMonitor m(*this, "Build", coarseLevel);

  const ParameterList &pL = GetParameterList();
  std::string vectorName  = pL.get<std::string>("Vector name");

  RCP<MultiVector> fineVector = fineLevel.Get<RCP<MultiVector> >(vectorName, GetFactory("Vector factory").get());
  RCP<Matrix> transferOp      = Get<RCP<Matrix> >(coarseLevel, "R");

  RCP<MultiVector> coarseVector = MultiVectorFactory::Build(transferOp->getRangeMap(), fineVector->getNumVectors());
  GetOStream(Runtime0) << "Transferring multivector \"" << vectorName << "\"" << std::endl;

  RCP<MultiVector> onesVector = MultiVectorFactory::Build(transferOp->getDomainMap(), 1);
  onesVector->putScalar(Teuchos::ScalarTraits<Scalar>::one());
  RCP<MultiVector> rowSumVector = MultiVectorFactory::Build(transferOp->getRangeMap(), 1);
  transferOp->apply(*onesVector, *rowSumVector);
  transferOp->apply(*fineVector, *coarseVector);

  if (vectorName == "Coordinates")
    TEUCHOS_TEST_FOR_EXCEPTION(true, Exceptions::RuntimeError, "Use CoordinatesTransferFactory to transfer coordinates instead of MultiVectorTransferFactory.");

  Set<RCP<MultiVector> >(coarseLevel, vectorName, coarseVector);

}  // Build

template <class Scalar, class LocalOrdinal, class GlobalOrdinal, class Node>
ArrayRCP<Scalar> MultiVectorTransferFactory<Scalar, LocalOrdinal, GlobalOrdinal, Node>::expandCoordinates(ArrayRCP<SC> coordinates, LocalOrdinal blksize) {
  if (blksize == 1)
    return coordinates;

  ArrayRCP<SC> expandCoord(coordinates.size() * blksize);  // TODO: how to avoid automatic initialization of the vector? using arcp()?

  for (int i = 0; i < coordinates.size(); i++) {
    for (int j = 0; j < blksize; j++) {
      expandCoord[i * blksize + j] = coordinates[i];
    }
  }
  return expandCoord;

}  // expandCoordinates

}  // namespace MueLu

#endif  // MUELU_MULTIVECTORTRANSFER_FACTORY_DEF_HPP