MueLu_BlockedCoordinatesTransferFactory_def.hpp

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#ifndef MUELU_BLOCKEDCOORDINATESTRANSFER_FACTORY_DEF_HPP
#define MUELU_BLOCKEDCOORDINATESTRANSFER_FACTORY_DEF_HPP
 
#include "Xpetra_ImportFactory.hpp"
#include "Xpetra_MultiVectorFactory.hpp"
#include "Xpetra_MapFactory.hpp"
#include "Xpetra_IO.hpp"
 
#include "MueLu_BlockedCoordinatesTransferFactory_decl.hpp"
 
#include "MueLu_Level.hpp"
#include "MueLu_Monitor.hpp"
 
namespace MueLu {
 
  template <class Scalar, class LocalOrdinal, class GlobalOrdinal, class Node>
  RCP<const ParameterList> BlockedCoordinatesTransferFactory<Scalar, LocalOrdinal, GlobalOrdinal, Node>::GetValidParameterList() const {
    RCP<ParameterList> validParamList = rcp(new ParameterList());
 
    validParamList->set<RCP<const FactoryBase> >("Coordinates",                  Teuchos::null, "Factory for coordinates generation");
    validParamList->set<RCP<const FactoryBase> >("CoarseMap",                    Teuchos::null, "Generating factory of the coarse map");
    return validParamList;
  }
 
  template <class Scalar, class LocalOrdinal, class GlobalOrdinal, class Node>
  void BlockedCoordinatesTransferFactory<Scalar, LocalOrdinal, GlobalOrdinal, Node>::DeclareInput(Level& /* fineLevel */, Level& coarseLevel) const {
    Input(coarseLevel, "CoarseMap");
 
    // Make sure the Level knows I need these sub-Factories
    const size_t numSubFactories = NumFactories();
    for(size_t i=0; i<numSubFactories; i++) {
      const RCP<const FactoryBase>& myFactory = subFactories_[i];
      coarseLevel.DeclareInput("Coordinates", myFactory.getRawPtr(), this);
    }
 
    // call DeclareInput of all user-given transfer factories
    for (std::vector<RCP<const FactoryBase> >::const_iterator it = subFactories_.begin(); it != subFactories_.end(); ++it)
      (*it)->CallDeclareInput(coarseLevel);
  }
 
  template <class Scalar, class LocalOrdinal, class GlobalOrdinal, class Node>
  void BlockedCoordinatesTransferFactory<Scalar, LocalOrdinal, GlobalOrdinal, Node>::Build(Level & /* fineLevel */, Level &coarseLevel) const {
    FactoryMonitor m(*this, "Build", coarseLevel);
 
    typedef Xpetra::MultiVector<typename Teuchos::ScalarTraits<Scalar>::coordinateType,LO,GO,NO> dMV;
    typedef Xpetra::BlockedMultiVector<typename Teuchos::ScalarTraits<Scalar>::coordinateType,LO,GO,NO> dBV;
 
    GetOStream(Runtime0) << "Transferring (blocked) coordinates" << std::endl;
 
    const size_t numSubFactories = NumFactories();
    std::vector<RCP<const Map> > subBlockMaps(numSubFactories);
    std::vector<RCP<dMV> > subBlockCoords(numSubFactories);
 
    if (coarseLevel.IsAvailable("Coordinates", this)) {
      GetOStream(Runtime0) << "Reusing coordinates" << std::endl;
      return;
    }
 
    // Get components
    for(size_t i=0; i<numSubFactories; i++) {
      GetOStream(Runtime1) << "Generating Coordinates for block " << i <<"/"<<numSubFactories <<std::endl;
      const RCP<const FactoryBase>& myFactory = subFactories_[i];
      myFactory->CallBuild(coarseLevel);
      subBlockCoords[i] = coarseLevel.Get<RCP<dMV> >("Coordinates", myFactory.get());
      subBlockMaps[i]   = subBlockCoords[i]->getMap();
    }
 
    // Blocked Map
    RCP<const BlockedMap> coarseCoordMapBlocked;
 
    {
      // coarseMap is being used to set up the domain map of tentative P, and therefore, the row map of Ac
      // Therefore, if we amalgamate coarseMap, logical nodes in the coordinates vector would correspond to
      // logical blocks in the matrix
      RCP<const BlockedMap> coarseMap = Get< RCP<const BlockedMap> >(coarseLevel, "CoarseMap");
      bool thyraMode = coarseMap->getThyraMode();
 
      ArrayView<const GO> elementAList = coarseMap->getFullMap()->getLocalElementList();
 
      LO blkSize = 1;
      if (rcp_dynamic_cast<const StridedMap>(coarseMap->getMap(0, thyraMode)) != Teuchos::null)
        blkSize = rcp_dynamic_cast<const StridedMap>(coarseMap->getMap(0, thyraMode))->getFixedBlockSize();
 
      for(size_t i=1; i<numSubFactories; i++) {
        LO otherBlkSize = 1;
        if (rcp_dynamic_cast<const StridedMap>(coarseMap->getMap(i, thyraMode)) != Teuchos::null)
          otherBlkSize = rcp_dynamic_cast<const StridedMap>(coarseMap->getMap(i, thyraMode))->getFixedBlockSize();
        TEUCHOS_TEST_FOR_EXCEPTION(otherBlkSize != blkSize, Exceptions::RuntimeError, "BlockedCoordinatesTransferFactory: Subblocks have different Block sizes. This is not yet supported.");
      }
 
      GO        indexBase   = coarseMap->getFullMap()->getIndexBase();
      size_t    numElements = elementAList.size() / blkSize;
      Array<GO> elementList(numElements);
 
      // Amalgamate the map
      for (LO i = 0; i < Teuchos::as<LO>(numElements); i++)
        elementList[i] = (elementAList[i*blkSize]-indexBase)/blkSize + indexBase;
 
      RCP<const Map> coarseCoordMap = MapFactory::Build(coarseMap->getFullMap()->lib(),
              Teuchos::OrdinalTraits<Xpetra::global_size_t>::invalid(), elementList, indexBase, coarseMap->getFullMap()->getComm());
 
      coarseCoordMapBlocked = rcp(new BlockedMap(coarseCoordMap, subBlockMaps, thyraMode));
    }
 
    // Build blocked coordinates vector
    RCP<dBV> bcoarseCoords = rcp(new dBV(coarseCoordMapBlocked,subBlockCoords));
 
    // Turn the blocked coordinates vector into an unblocked one
    RCP<dMV> coarseCoords = bcoarseCoords->Merge();
    Set<RCP<dMV> >(coarseLevel, "Coordinates", coarseCoords);
  }
 
  template <class Scalar, class LocalOrdinal, class GlobalOrdinal, class Node>
  void BlockedCoordinatesTransferFactory<Scalar, LocalOrdinal, GlobalOrdinal, Node>::AddFactory(const RCP<const FactoryBase>& factory) {
    subFactories_.push_back(factory);
  }
 
 
 
} // namespace MueLu
 
#endif // MUELU_BLOCKEDCOORDINATESTRANSFER_FACTORY_DEF_HPP