Xpetra_Utils.cpp

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//             Xpetra: A linear algebra interface package
//                  Copyright 2012 Sandia Corporation
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#include "Xpetra_Utils.hpp"
#include "Xpetra_Exceptions.hpp"

namespace Xpetra {

  std::string toString(Xpetra::UnderlyingLib lib) {
    if (lib == Xpetra::UseTpetra) {
      return "Tpetra";
    } else if (lib == Xpetra::UseEpetra) {
      return "Epetra";
    } else {
      TEUCHOS_TEST_FOR_EXCEPTION(true, Xpetra::Exceptions::RuntimeError, "lib != UseTpetra && lib != UseEpetra");
    }
  }

#ifdef HAVE_XPETRA_TPETRA

  Xpetra::LookupStatus toXpetra(Tpetra::LookupStatus ls) {

    if (ls == Tpetra::AllIDsPresent)
      return Xpetra::AllIDsPresent;
    if (ls == Tpetra::IDNotPresent)
      return Xpetra::IDNotPresent;

    TEUCHOS_TEST_FOR_EXCEPTION(1, Xpetra::Exceptions::RuntimeError, "Unknown LookupStatus");

  }

  Tpetra::OptimizeOption toTpetra(Xpetra::OptimizeOption os) {

    if (os == Xpetra::DoOptimizeStorage)
      return Tpetra::DoOptimizeStorage;
    if (os == Xpetra::DoNotOptimizeStorage)
      return Tpetra::DoNotOptimizeStorage;

    TEUCHOS_TEST_FOR_EXCEPTION(1, Xpetra::Exceptions::RuntimeError, "Unknown OptimizeOption");

  }

  Tpetra::CombineMode toTpetra(Xpetra::CombineMode cm) {

    if (cm == Xpetra::ADD)
      return Tpetra::ADD;

    if (cm == Xpetra::INSERT)
      return Tpetra::INSERT;

    if (cm == Xpetra::ABSMAX)
      return Tpetra::ABSMAX;

    TEUCHOS_TEST_FOR_EXCEPTION(1, Xpetra::Exceptions::RuntimeError, "Cannot convert Xpetra::CombineMode to Tpetra::CombineMode: unsupported CombineMode.");

  }

  Tpetra::LocalGlobal toTpetra(LocalGlobal lg) {

    if (lg == Xpetra::LocallyReplicated)
      return Tpetra::LocallyReplicated;
    if (lg == Xpetra::GloballyDistributed)
      return Tpetra::GloballyDistributed;

    TEUCHOS_TEST_FOR_EXCEPTION(1, Xpetra::Exceptions::RuntimeError, "Unknown LocalGlobal");

  }

#endif // HAVE_XPETRA_TPETRA

#ifdef HAVE_XPETRA_EPETRA

  Xpetra::LookupStatus toXpetra(int ls) {
    // This function is used only to convert the return value of Epetra_BlockMap::RemoteIDList() and Epetra_DirectoryBase::GetDirectoryEntries().
    // In the current implementation of Epetra (01/2012), these functions returns 0 (= success) or 1 (= a GID is not present on any processor).

    if (ls == 0)
      return Xpetra::AllIDsPresent;
    else if (ls == 1)
      return Xpetra::IDNotPresent;

    TEUCHOS_TEST_FOR_EXCEPTION(1, Xpetra::Exceptions::RuntimeError, "Epetra returned the following error code: " << ls << ". Xpetra do not know how to interpret this error code.");
  }

  bool toEpetra(Xpetra::OptimizeOption os) {

    if (os == Xpetra::DoOptimizeStorage)
      return true;
    if (os == Xpetra::DoNotOptimizeStorage)
      return false;

    TEUCHOS_TEST_FOR_EXCEPTION(1, Xpetra::Exceptions::RuntimeError, "Unknown OptimizeOption");

  }

  Epetra_CombineMode toEpetra(Xpetra::CombineMode cm) {
    // Note: all the CombineMode are not supported.
    // According to Chris B., the behavior in Tpetra is the same as Epetra but I prefer to limit my tests for now.
    // See also the discussion of March 22 on the Tpetra developers mailing list.

    if (cm == Xpetra::ADD)
      return Add;
    if (cm == Xpetra::INSERT)
      return Insert;
    if (cm == Xpetra::ABSMAX)
      return AbsMax;

    TEUCHOS_TEST_FOR_EXCEPTION(1, Xpetra::Exceptions::RuntimeError, "Cannot convert Xpetra::CombineMode to Epetra_CombineMode: unsupported CombineMode.");

  }

#endif // HAVE_XPETRA_EPETRA

} // namespace xpetra