Xpetra_Parameters.hpp

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//             Xpetra: A linear algebra interface package
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#ifndef XPETRA_PARAMETERS_HPP
#define XPETRA_PARAMETERS_HPP

#include <Teuchos_Describable.hpp>
#include <Teuchos_VerboseObject.hpp>
#include <Teuchos_CommandLineProcessor.hpp>

#include <Xpetra_Map.hpp> // for UnderlyingLib definition
#include <Xpetra_Utils.hpp> // for toString(lib_)

namespace Xpetra {

  enum Instantiation {
    DOUBLE_INT_INT,
    DOUBLE_INT_LONGINT,
    DOUBLE_INT_LONGLONGINT,
    COMPLEX_INT_INT,
    FLOAT_INT_INT
  };

  class Parameters
    : public Teuchos::VerboseObject<Parameters>, public Teuchos::Describable
  {

  public:

    Parameters(Teuchos::CommandLineProcessor& clp) {
      setCLP(clp);
    }

    void setCLP(Teuchos::CommandLineProcessor& clp) {
      int nOptions=0;                                  // Gives the number of possible option values to select
      const int maxOptions=2;                          // No more than 2 libraries are supported right now
      Xpetra::UnderlyingLib optionValues[maxOptions];  // Array that gives the numeric values for each option.
      const char*           optionNames [maxOptions];  // Array that gives the name used in the commandline for each option.

      std::stringstream documentation; // documentation for the option
      documentation << "linear algebra library (Epetra, Tpetra)";

      // Default is Tpetra if available. If not, default is Epetra
#if defined(HAVE_XPETRA_EPETRA)
      lib_ = Xpetra::UseEpetra; // set default (if Tpetra support is missing)
      optionValues[nOptions] = Xpetra::UseEpetra;
      //optionValues[nOptions] = "epetra"; //TODO: do not break compatibility right now
      optionNames[nOptions] = "Epetra";
      nOptions++;
#endif
#if defined(HAVE_XPETRA_TPETRA)
      lib_ = Xpetra::UseTpetra; // set default
      optionValues[nOptions] = Xpetra::UseTpetra;
      //optionsValues[nOptions] = "tpetra"; //TODO: do not break compatibility right now
      optionNames[nOptions] = "Tpetra";
      nOptions++;
#endif

      clp.setOption<Xpetra::UnderlyingLib>("linAlgebra", &lib_, nOptions, optionValues, optionNames, documentation.str().c_str());

#if defined(HAVE_XPETRA_TPETRA)
      int nInstOptions=0;                                     // Gives the number of possible option values to select
      const int   maxInstOptions=5;                           // No more than 5 instantiations are supported right now
      Xpetra::Instantiation instOptionValues[maxInstOptions]; // Array that gives the numeric values for each option.
      const char *          instOptionNames [maxInstOptions]; // Array that gives the name used in the commandline for each option.

      // The ordering of these blocks determines the default behavior.
      // We test the first available instantiation from the bottom
      // (i.e. DOUBLE_INT_INT runs if nothing else is available).
#  if defined(HAVE_MUELU_INST_DOUBLE_INT_INT) || defined(HAVE_TPETRA_INST_DOUBLE) && defined(HAVE_TPETRA_INST_INT_INT)
      inst_ = Xpetra::DOUBLE_INT_INT;  // set default
      instOptionValues[nInstOptions] = Xpetra::DOUBLE_INT_INT;
      instOptionNames[nInstOptions] = "DOUBLE_INT_INT";
      nInstOptions++;
#  endif
#  if defined(HAVE_MUELU_INST_DOUBLE_INT_LONGINT) || defined(HAVE_TPETRA_INST_DOUBLE) && defined(HAVE_TPETRA_INST_INT_LONG)
      inst_ = Xpetra::DOUBLE_INT_LONGINT;  // set default
      instOptionValues[nInstOptions] = Xpetra::DOUBLE_INT_LONGINT;
      instOptionNames[nInstOptions] = "DOUBLE_INT_LONGINT";
      nInstOptions++;
#  endif
#  if defined(HAVE_MUELU_INST_DOUBLE_INT_LONGLONGINT) || defined(HAVE_TPETRA_INST_DOUBLE) && defined(HAVE_TPETRA_INST_INT_LONG_LONG)
      inst_ = Xpetra::DOUBLE_INT_LONGLONGINT;  // set default
      instOptionValues[nInstOptions] = Xpetra::DOUBLE_INT_LONGLONGINT;
      instOptionNames[nInstOptions] = "DOUBLE_INT_LONGLONGINT";
      nInstOptions++;
#  endif
#  if defined(HAVE_MUELU_INST_COMPLEX_INT_INT) || defined(HAVE_TPETRA_INST_COMPLEX_DOUBLE) && defined(HAVE_TPETRA_INST_INT_INT)
      inst_ = Xpetra::COMPLEX_INT_INT;  // set default
      instOptionValues[nInstOptions] = Xpetra::COMPLEX_INT_INT;
      instOptionNames[nInstOptions] = "COMPLEX_INT_INT";
      nInstOptions++;
#  endif
#  if defined(HAVE_MUELU_INST_FLOAT_INT_INT) || defined(HAVE_TPETRA_INST_FLOAT) && defined(HAVE_TPETRA_INST_INT_INT)
      inst_ = Xpetra::FLOAT_INT_INT;  // set default
      instOptionValues[nInstOptions] = Xpetra::FLOAT_INT_INT;
      instOptionNames[nInstOptions] = "FLOAT_INT_INT";
      nInstOptions++;
#  endif
      std::stringstream instDocumentation; // documentation for the option
      instDocumentation << "choice of instantiation";

      clp.setOption<Xpetra::Instantiation>("instantiation", &inst_, nInstOptions, instOptionValues, instOptionNames, instDocumentation.str().c_str());
#endif

    }

    void check() const {
      //TODO with ifdef...
    }

    Xpetra::UnderlyingLib GetLib() const {
      check();
      return lib_;
    }

    Xpetra::Instantiation GetInstantiation() const {
      check();
      return inst_;
    }



    std::string description() const {
      std::ostringstream out;
      out << Teuchos::Describable::description();
      out << "{lib = "  << toString(lib_) << "} ";
      return out.str();
    }

    void describe(Teuchos::FancyOStream &out, const Teuchos::EVerbosityLevel verbLevel = verbLevel_default) const {
      using std::endl;
      int vl = (verbLevel == Teuchos::VERB_DEFAULT) ? Teuchos::VERB_LOW : verbLevel;
      if (vl == Teuchos::VERB_NONE) return;

      if (vl == Teuchos::VERB_LOW) { out << description() << endl; } else { out << Teuchos::Describable::description() << endl; }

      if (vl == Teuchos::VERB_MEDIUM || vl == Teuchos::VERB_HIGH || vl == Teuchos::VERB_EXTREME) {
        Teuchos::OSTab tab1(out);
        out << "Linear algebra library: " << toString(lib_) << endl;
      }
    }


  private:
    Xpetra::UnderlyingLib lib_;
    Xpetra::Instantiation inst_;
  };

}

#endif