Xpetra_MapExtractor.hpp

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#ifndef XPETRA_MAPEXTRACTOR_HPP_
#define XPETRA_MAPEXTRACTOR_HPP_

#include <map>

#include <iostream>

#include <Teuchos_RCP.hpp>
#include <Teuchos_Describable.hpp>
#include <Xpetra_Import.hpp>
#include <Xpetra_Map.hpp>

#include "Xpetra_Import.hpp"
#include "Xpetra_ImportFactory.hpp"
#include "Xpetra_MultiVector.hpp"
#include "Xpetra_MultiVectorFactory.hpp"
#include "Xpetra_Vector.hpp"
#include "Xpetra_VectorFactory.hpp"


namespace Xpetra {

  template <class Scalar = MultiVector<>::scalar_type,
            class LocalOrdinal = Map<>::local_ordinal_type,
            class GlobalOrdinal = typename Map<LocalOrdinal>::global_ordinal_type,
            class Node = typename Map<LocalOrdinal, GlobalOrdinal>::node_type>
  class MapExtractor : public Teuchos::Describable {
  public:
    typedef Scalar scalar_type;
    typedef LocalOrdinal local_ordinal_type;
    typedef GlobalOrdinal global_ordinal_type;
    typedef Node node_type;

  private:
#undef XPETRA_MAPEXTRACTOR_SHORT
#include "Xpetra_UseShortNames.hpp"

  public:

    MapExtractor(const RCP<const Map>& fullmap, const std::vector<RCP<const Map> >& maps) {
      fullmap_ = fullmap;
      maps_ = maps;

      importers_.resize(maps_.size());
      for (unsigned i = 0; i < maps_.size(); ++i)
        if (maps[i] != null)
          importers_[i] = ImportFactory::Build(fullmap_, maps[i]);

      TEUCHOS_TEST_FOR_EXCEPTION(CheckConsistency() == false, std::logic_error,
                                 "logic error. full map and sub maps are inconsistently distributed over the processors.");
    }

    void ExtractVector(const Vector& full, size_t block, Vector& partial) const {
      TEUCHOS_TEST_FOR_EXCEPTION(maps_[block] == null, Xpetra::Exceptions::RuntimeError,
            "ExtractVector: maps_[" << block << "] is null");

      partial.doImport(full, *importers_[block], Xpetra::INSERT);
    }
    void ExtractVector(const MultiVector& full, size_t block, MultiVector& partial) const {
      TEUCHOS_TEST_FOR_EXCEPTION(maps_[block] == null, Xpetra::Exceptions::RuntimeError,
            "ExtractVector: maps_[" << block << "] is null");

      partial.doImport(full, *importers_[block], Xpetra::INSERT);
    }
    void ExtractVector(RCP<const      Vector>& full, size_t block, RCP<     Vector>& partial) const { ExtractVector(*full, block, *partial); }
    void ExtractVector(RCP<           Vector>& full, size_t block, RCP<     Vector>& partial) const { ExtractVector(*full, block, *partial); }
    void ExtractVector(RCP<const MultiVector>& full, size_t block, RCP<MultiVector>& partial) const { ExtractVector(*full, block, *partial); }
    void ExtractVector(RCP<      MultiVector>& full, size_t block, RCP<MultiVector>& partial) const { ExtractVector(*full, block, *partial); }

    RCP<     Vector> ExtractVector(RCP<const      Vector>& full, size_t block) const {
      TEUCHOS_TEST_FOR_EXCEPTION(maps_[block] == null, Xpetra::Exceptions::RuntimeError,
            "ExtractVector: maps_[" << block << "] is null");
      const RCP<Vector> ret = VectorFactory::Build(getMap(block), true);
      ExtractVector(*full, block, *ret);
      return ret;
    }
    RCP<     Vector> ExtractVector(RCP<           Vector>& full, size_t block) const {
      TEUCHOS_TEST_FOR_EXCEPTION(maps_[block] == null, Xpetra::Exceptions::RuntimeError,
            "ExtractVector: maps_[" << block << "] is null");
      const RCP<Vector> ret = VectorFactory::Build(getMap(block), true);
      ExtractVector(*full, block, *ret);
      return ret;
    }
    RCP<MultiVector> ExtractVector(RCP<const MultiVector>& full, size_t block) const {
      TEUCHOS_TEST_FOR_EXCEPTION(maps_[block] == null, Xpetra::Exceptions::RuntimeError,
            "ExtractVector: maps_[" << block << "] is null");
      const RCP<Vector> ret = VectorFactory::Build(getMap(block), true);
      ExtractVector(*full, block, *ret);
      return ret;
    }
    RCP<MultiVector> ExtractVector(RCP<      MultiVector>& full, size_t block) const {
      TEUCHOS_TEST_FOR_EXCEPTION(maps_[block] == null, Xpetra::Exceptions::RuntimeError,
            "ExtractVector: maps_[" << block << "] is null");
      const RCP<Vector> ret = VectorFactory::Build(getMap(block), true);
      ExtractVector(*full, block, *ret);
      return ret;
    }

    void InsertVector(const Vector& partial, size_t block, Vector& full) const {
      TEUCHOS_TEST_FOR_EXCEPTION(maps_[block] == null, Xpetra::Exceptions::RuntimeError,
            "InsertVector: maps_[" << block << "] is null");

      full.doExport(partial, *importers_[block], Xpetra::INSERT);
    }
    void InsertVector(const MultiVector& partial, size_t block, MultiVector& full) const {
      TEUCHOS_TEST_FOR_EXCEPTION(maps_[block] == null, Xpetra::Exceptions::RuntimeError,
            "InsertVector: maps_[" << block << "] is null");

      full.doExport(partial, *importers_[block], Xpetra::INSERT);
    }

    void InsertVector(RCP<const      Vector>& partial, size_t block, RCP<     Vector>& full) const { InsertVector(*partial, block, *full); }
    void InsertVector(RCP<           Vector>& partial, size_t block, RCP<     Vector>& full) const { InsertVector(*partial, block, *full); }
    void InsertVector(RCP<const MultiVector>& partial, size_t block, RCP<MultiVector>& full) const { InsertVector(*partial, block, *full); }
    void InsertVector(RCP<      MultiVector>& partial, size_t block, RCP<MultiVector>& full) const { InsertVector(*partial, block, *full); }



    RCP<     Vector> getVector(size_t i) const                { return      VectorFactory::Build(getMap(i), true); }
    RCP<MultiVector> getVector(size_t i, size_t numvec) const { return MultiVectorFactory::Build(getMap(i), numvec, true); }


    size_t NumMaps() const { return maps_.size(); }

    const RCP<const Map> getMap(size_t i) const { return maps_[i]; }

    const RCP<const Map> getFullMap() const { return fullmap_; }

    size_t getMapIndexForGID(GlobalOrdinal gid) const {
      for (size_t i = 0; i < NumMaps(); i++)
        if (getMap(i)->isNodeGlobalElement(gid) == true)
          return i;

      TEUCHOS_TEST_FOR_EXCEPTION(false, Xpetra::Exceptions::RuntimeError,
                                 "getMapIndexForGID: GID " << gid << " is not contained by a map in mapextractor." );
      return 0;
    }


  private:
    bool CheckConsistency() const {
      const RCP<const Map> fullMap = getFullMap();

      for (size_t i = 0; i < NumMaps(); i++) {
        const RCP<const Map> map = getMap(i);

        ArrayView<const GlobalOrdinal> mapGids = map->getNodeElementList();
        for (typename ArrayView< const GlobalOrdinal >::const_iterator it = mapGids.begin(); it != mapGids.end(); it++)
          if (fullMap->isNodeGlobalElement(*it) == false)
            return false; // Global ID (*it) not found locally on this proc in fullMap -> error
      }
      return true;
    }

  private:
    RCP<const Map >               fullmap_;
    std::vector<RCP<const Map > > maps_;
    std::vector<RCP<Import > >    importers_;
  };
}

#define XPETRA_MAPEXTRACTOR_SHORT
#endif /* XPETRA_MAPEXTRACTOR_HPP_ */