DGMapper moved from dgspace.hh to here.

[[Imported from SVN: r1263]]

fem/dgspace/dgmapper.hh

+// -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+// vi: set et ts=4 sw=2 sts=2:
+#ifndef __DUNE_DGMAPPER_HH__
+#define __DUNE_DGMAPPER_HH__
+
+#include <dune/fem/common/dofmapperinterface.hh>
+
+namespace Dune {
+
+  //***************************************************************************
+  //
+  //!  DG Mapper for mapping of local dof numbers to global dof numbers,
+  //!  i.e. the entry in the vector of unknowns
+  //
+  //***************************************************************************
+  template <class IndexSetType, int polOrd, int dimRange>
+  class DGMapper
+    : public DofMapperDefault < DGMapper <IndexSetType,polOrd, dimRange > >
+  {
+    // index set of grid, i.e. the element indices
+    IndexSetType &indexSet_;
+
+    // number of dofs on element
+    int numberOfDofs_;
+    int level_;
+  public:
+    //! Constructor
+    DGMapper ( IndexSetType &iset , int numDof , int level) :
+      indexSet_ (iset), numberOfDofs_ (numDof), level_(level)  {};
+
+    //! return size of function space
+    //! see dofmanager.hh for definition of IndexSet, which
+    //! is a wrapper for en.index
+    int size () const
+    {
+      // return number of dofs * number of elements
+      return (numberOfDofs_ * indexSet_.size( level_ , 0 ));
+    }
+
+    //! return boundary type for given boundary id
+    //! uses the parameter class BoundaryIdentifierType
+    BoundaryType boundaryType ( int id ) const
+    {
+      // to be expanded for user needs
+      return (id < 0) ? Dirichlet : Neumann;
+    }
+
+    //! map Entity an local Dof number to global Dof number
+    //! see dofmanager.hh for definition of IndexSet, which
+    //! is a wrapper for en.index
+    template <class EntityType>
+    int mapToGlobal (EntityType &en, int localNum ) const
+    {
+      // indexSet_.index<0>(en,0) return 0 entity of codim the codim 0
+      // entitys of en which is the element index
+      return ((indexSet_.template index<0>(en,0) * numberOfDofs_) + localNum);
+    };
+
+    //** size methods needed by the dofmanager ***
+    //! calc new start point for element dof , vertex dof ...
+    //not needed here at the moment
+    virtual void calcInsertPoints () {};
+
+    //! default implementation if not overlaoded
+    virtual int numberOfDofs () const
+    {
+      return numberOfDofs_;
+    }
+
+    //! only called once, if grid was adapted
+    virtual int newSize() const
+    {
+      return this->size();
+    }
+  };
+
+} // end namespace Dune
+
+#endif