source_Local.cpp

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#include "source_Local.h"

#ifdef USE_PARAMETERS_FACTORY
#include "parameters_factory.h"
#endif

using std::valarray;

#ifdef USE_FACTORY
namespace {
  Source *create_object()
  {
    return new Source_Local();
  }


  bool init = Source::Factory::Register("Local", create_object);
}
#endif

//- parameter entry
namespace {
  void append_entry(Parameters& param)
  {
    param.Register_int_vector("source_position", valarray<int>());

    param.Register_string("verbose_level", "NULL");
  }


#ifdef USE_PARAMETERS_FACTORY
  bool init_param = ParametersFactory::Register("Source.Local", append_entry);
#endif
}
//- end

//- parameters class
Parameters_Source_Local::Parameters_Source_Local() { append_entry(*this); }
//- end

//====================================================================
void Source_Local::set_parameters(const Parameters& params)
{
  const string str_vlevel = params.get_string("verbose_level");

  m_vl = vout.set_verbose_level(str_vlevel);

  //- fetch and check input parameters
  valarray<int> source_position;

  int err = 0;
  err += params.fetch_int_vector("source_position", source_position);

  if (err) {
    vout.crucial(m_vl, "Source_Local: fetch error, input parameter not found.\n");
    abort();
  }

  set_parameters(source_position);
}


//====================================================================
void Source_Local::set_parameters(const valarray<int>& source_position)
{
  // ####  parameter setup  ####
  int Ndim = CommonParameters::Ndim();

  valarray<int> Lsize(Ndim);
  Lsize[0] = CommonParameters::Lx();
  Lsize[1] = CommonParameters::Ly();
  Lsize[2] = CommonParameters::Lz();
  Lsize[3] = CommonParameters::Lt();

  //- print input parameters
  vout.general(m_vl, "Source for spinor field - local:\n");
  for (int mu = 0; mu < Ndim; ++mu) {
    vout.general(m_vl, "  source_position[%d] = %d\n",
                 mu, source_position[mu]);
  }

  //- range check
  int err = 0;
  for (int mu = 0; mu < Ndim; ++mu) {
    // NB. Lsize[mu] > abs(source_position[mu])
    err += ParameterCheck::non_negative(Lsize[mu] - abs(source_position[mu]));
  }

  if (err) {
    vout.crucial(m_vl, "Source_Local: parameter range check failed.\n");
    abort();
  }

  assert(source_position.size() == Ndim);

  //- store values
  m_source_position.resize(Ndim);
  m_source_position = source_position;

  for (int mu = 0; mu < Ndim; ++mu) {
    while (m_source_position[mu] < 0)
    {
      m_source_position[mu] += Lsize[mu];
    }
    m_source_position[mu] %= Lsize[mu];
  }


  //- post-process
  valarray<int> Nsize(Ndim);
  Nsize[0] = CommonParameters::Nx();
  Nsize[1] = CommonParameters::Ny();
  Nsize[2] = CommonParameters::Nz();
  Nsize[3] = CommonParameters::Nt();

  //- check if source position is in current local node.
  m_in_node = true;
  for (int i = 0; i < Ndim; ++i) {
    int inode = m_source_position[i] / Nsize[i];

    if (inode != Communicator::ipe(i)) {
      m_in_node = false;
      break;
    }
  }

  //- find local coordinate of source position.
  if (m_in_node) {
    for (int i = 0; i < Ndim; ++i) {
      m_source_position[i] %= Nsize[i];
    }
  } else {
    for (int i = 0; i < Ndim; ++i) {
      m_source_position[i] = -1;
    }
  }
}


//====================================================================
void Source_Local::set(Field& src, int j)
{
  //- clear field
  src = 0.0;

  if (m_in_node) {
    int isite = m_index.site(
      m_source_position[0],
      m_source_position[1],
      m_source_position[2],
      m_source_position[3]
      );

    //XXX complex as two doubles
    src.set(2 * j, isite, 0, 1.0);
  }
}


//====================================================================
//============================================================END=====