Added bart_builder.h SlaybaughLab#10

1. Added bart_builder.h and .cc. bart_build contains functions we
can use to project base classes to specific models.
2. Explicitly use PETScWrappers namespace instead of redefining one
as LA
3. Changed main.cc so we can build the whole thing through BartDriver

src/common/bart_builder.cc

@@ -0,0 +1,37 @@
+#include "bart_builder.h"
+#include "../transport/even_parity.h"
+#include "../aqdata/aq_lsgc"
+
+
+template <int dim>
+std_cxx11::shared_ptr<TransportBase<dim> >
+build_transport_model (ParameterHandler &prm)
+{
+  std::string transport_model_name = prm.get ("transport model");
+  AssertThrow (transport_model_name!="none",
+               ExcMessage("transport model name incorrect or missing"));
+  std_cxx11::shared_ptr<TransportBase<dim> > transport_class;
+  if (transport_model_name=="ep")
+    transport_class =
+    std_cxx11::shared_ptr<TransportBase<dim> > (new EvenParity<dim> (prm));
+  return transport_class;
+}
+
+template <int dim>
+std_cxx11::shared_ptr<AQBase<dim> >
+build_aq_model (ParameterHandler &prm)
+{
+  std::string aq_name = prm.get ("angular quadrature name");
+  AssertThrow (aq_name!="none",
+               ExcMessage("angular quadrature name incorrect or missing"));
+  std_cxx11::shared_ptr<AQBase<dim> > aq_class;
+  if (aq_name=="lsgc")
+    aq_class = std_cxx11::shared_ptr<AQBase<dim> > (new LSGC<dim>(prm));
+  return aq_class;
+}
+
+template std_cxx11::shared_ptr<TransportBase<2> > build_transport_model;
+template std_cxx11::shared_ptr<TransportBase<3> > build_transport_model;
+template std_cxx11::shared_ptr<AQBase<2> > build_aq_model;
+template std_cxx11::shared_ptr<AQBase<3> > build_aq_model;
+

src/common/bart_builder.h

@@ -0,0 +1,21 @@
+#ifndef __bart_builder_h__
+#define __bart_builder_h__
+
+#include <deal.II/base/parameter_handler.h>
+
+#include <string>
+#include <map>
+
+#include "../transport/transport_base.h"
+
+using namespace dealii;
+
+template <int dim>
+std_cxx11::shared_ptr<TransportBase<dim> >
+build_transport_model (ParameterHandler &prm);
+
+template <int dim>
+std_cxx11::shared_ptr<AQBase<dim> >
+build_aq_model (ParameterHandler &prm);
+
+#endif //__bart_builder_h__