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//
//             Xpetra: A linear algebra interface package
//                  Copyright 2012 Sandia Corporation
//
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// @HEADER
#ifndef XPETRA_IMPORTFACTORY_HPP
#define XPETRA_IMPORTFACTORY_HPP

#include "Xpetra_ConfigDefs.hpp"

#include "Xpetra_Import.hpp"

#ifdef HAVE_XPETRA_TPETRA
#include "Xpetra_TpetraImport.hpp"
#endif
#ifdef HAVE_XPETRA_EPETRA
#include "Xpetra_EpetraImport.hpp"
#endif

#include "Xpetra_Exceptions.hpp"

namespace Xpetra {

  template <class LocalOrdinal/* = Import<>::local_ordinal_type*/,
            class GlobalOrdinal/* = typename Import<LocalOrdinal>::global_ordinal_type*/,
            class Node = typename Import<LocalOrdinal, GlobalOrdinal>::node_type>
  class ImportFactory {
  private:
    //! Private constructor. This is a static class.
    ImportFactory() {}

  public:

    //! Constructor specifying the number of non-zeros for all rows.
    static RCP<Import<LocalOrdinal, GlobalOrdinal, Node> > Build(const RCP<const Map<LocalOrdinal, GlobalOrdinal, Node> > &source, const RCP<const Map<LocalOrdinal, GlobalOrdinal, Node> > &target) {
      XPETRA_MONITOR("ImportFactory::Build");

      TEUCHOS_TEST_FOR_EXCEPTION(source->lib() != target->lib(), Xpetra::Exceptions::RuntimeError, "");

#ifdef HAVE_XPETRA_TPETRA
      if (source->lib() == UseTpetra)
        return rcp( new TpetraImport<LocalOrdinal, GlobalOrdinal, Node>(source, target));
#endif

      XPETRA_FACTORY_ERROR_IF_EPETRA(source->lib());
      XPETRA_FACTORY_END;
    }

  };

// we need the Epetra specialization only if Epetra is enabled
#if (defined(HAVE_XPETRA_EPETRA) && !defined(XPETRA_EPETRA_NO_32BIT_GLOBAL_INDICES))

  // Specialization on LO=GO=int with serial node.
  // Used for Epetra and Tpetra
  // For any other node definition the general default implementation is used which allows Tpetra only
  template <>
  class ImportFactory<int, int, EpetraNode> {
    typedef int LocalOrdinal;
    typedef int GlobalOrdinal;
    typedef EpetraNode Node;

  private:
    //! Private constructor. This is a static class.
    ImportFactory() {}

  public:

    static RCP<Import<LocalOrdinal, GlobalOrdinal, Node> > Build(const RCP<const Map<LocalOrdinal, GlobalOrdinal, Node> > &source, const RCP<const Map<LocalOrdinal, GlobalOrdinal, Node> > &target) {
      XPETRA_MONITOR("ImportFactory::Build");
      TEUCHOS_TEST_FOR_EXCEPTION(source->lib() != target->lib(), Xpetra::Exceptions::RuntimeError, "");

#ifdef HAVE_XPETRA_TPETRA
      if (source->lib() == UseTpetra)
        return rcp( new TpetraImport<LocalOrdinal, GlobalOrdinal, Node>(source, target));
#endif

      if (source->lib() == UseEpetra)
        return rcp( new EpetraImportT<int,Node>(source, target));

      XPETRA_FACTORY_END;
    }

  };
#endif

// we need the Epetra specialization only if Epetra is enabled
#if (defined(HAVE_XPETRA_EPETRA) && !defined(XPETRA_EPETRA_NO_64BIT_GLOBAL_INDICES))
  template <>
  class ImportFactory<int, long long, EpetraNode> {

    typedef int LocalOrdinal;
    typedef long long GlobalOrdinal;
    typedef EpetraNode Node;

  private:
    //! Private constructor. This is a static class.
    ImportFactory() {}

  public:

    static RCP<Import<LocalOrdinal, GlobalOrdinal, Node> > Build(const RCP<const Map<LocalOrdinal, GlobalOrdinal, Node> > &source, const RCP<const Map<LocalOrdinal, GlobalOrdinal, Node> > &target) {
      XPETRA_MONITOR("ImportFactory::Build");
      TEUCHOS_TEST_FOR_EXCEPTION(source->lib() != target->lib(), Xpetra::Exceptions::RuntimeError, "");

#ifdef HAVE_XPETRA_TPETRA
      if (source->lib() == UseTpetra)
        return rcp( new TpetraImport<LocalOrdinal, GlobalOrdinal, Node>(source, target));
#endif

      if (source->lib() == UseEpetra)
        return rcp( new EpetraImportT<long long,Node>(source, target));

      XPETRA_FACTORY_END;
    }

  };
#endif
}

#define XPETRA_IMPORTFACTORY_SHORT
#endif
