MueLu_RepartitionBlockDiagonalFactory_def.hpp

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#ifndef MUELU_REPARTITIONBLOCKDIAGONALFACTORY_DEF_HPP_
#define MUELU_REPARTITIONBLOCKDIAGONALFACTORY_DEF_HPP_

#include "MueLu_RepartitionBlockDiagonalFactory_decl.hpp"

#include <Teuchos_Utils.hpp>

#include <Xpetra_BlockedCrsMatrix.hpp>

#include "MueLu_Exceptions.hpp"
#include "MueLu_FactoryManagerBase.hpp"
#include "MueLu_Level.hpp"
#include "MueLu_MasterList.hpp"
#include "MueLu_Monitor.hpp"
#include "MueLu_Utilities.hpp"

namespace MueLu {

 template <class Scalar, class LocalOrdinal, class GlobalOrdinal, class Node>
 RCP<const ParameterList> RepartitionBlockDiagonalFactory<Scalar, LocalOrdinal, GlobalOrdinal, Node>::GetValidParameterList() const {
    RCP<ParameterList> validParamList = rcp(new ParameterList());
    validParamList->set< RCP<const FactoryBase> >   ("A",             Teuchos::null, "Factory of the matrix A");

    return validParamList;
  }


  template <class Scalar, class LocalOrdinal, class GlobalOrdinal, class Node>
  void RepartitionBlockDiagonalFactory<Scalar, LocalOrdinal, GlobalOrdinal, Node>::DeclareInput(Level & currentLevel) const {
    Input(currentLevel, "A");
  } //DeclareInput()

  template <class Scalar, class LocalOrdinal, class GlobalOrdinal, class Node>
  void RepartitionBlockDiagonalFactory<Scalar, LocalOrdinal, GlobalOrdinal, Node>::Build(Level &currentLevel) const {
    FactoryMonitor m(*this, "Build", currentLevel);
    typedef Xpetra::BlockedCrsMatrix<Scalar, LocalOrdinal, GlobalOrdinal, Node>  BlockCrs;

    RCP<Matrix> originalA = Get< RCP<Matrix> >(currentLevel, "A");    
    RCP<BlockCrs> A = Teuchos::rcp_dynamic_cast<BlockCrs>(originalA);

    //    RCP<BlockCrs> A = Get< RCP<BlockCrs> >(currentLevel, "A");    
    TEUCHOS_TEST_FOR_EXCEPTION(A==Teuchos::null, Exceptions::BadCast, "MueLu::RepartitionBlockDiagonalFactory::Build: input matrix A is not of type BlockedCrsMatrix! error.");

    // Build the block diagonal
    RCP<BlockCrs> DiagonalMatrix = Teuchos::rcp(new BlockCrs(A->getBlockedRangeMap(),A->getBlockedDomainMap(),0));
    for(size_t i=0; i< A->Rows(); i++)
      DiagonalMatrix->setMatrix(i,i,A->getMatrix(i,i));

    Set(currentLevel,"A",Teuchos::rcp_dynamic_cast<Matrix>(DiagonalMatrix));

    
  } //Build()

} // end namespace MueLu

#endif /* MUELU_REPARTITIONBLOCKDIAGONALFACTORY_DEF_HPP_ */