dunefunctionslocalfunctionspace.hh

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// -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
// vi: set et ts=4 sw=2 sts=2:
#ifndef DUNE_PDELAB_GRIDFUNCTIONSPACE_DUNEFUNCTIONSLOCALFUNCTIONSPACE_HH
#define DUNE_PDELAB_GRIDFUNCTIONSPACE_DUNEFUNCTIONSLOCALFUNCTIONSPACE_HH
 
#include<vector>
 
#include <dune/common/stdstreams.hh>
#include <dune/common/shared_ptr.hh>
 
#include <dune/geometry/referenceelements.hh>
 
#include <dune/localfunctions/common/interfaceswitch.hh>
#include <dune/localfunctions/common/localkey.hh>
 
#include <dune/typetree/typetree.hh>
 
#include <dune/pdelab/gridfunctionspace/tags.hh>
#include <dune/pdelab/gridfunctionspace/localvector.hh>
 
namespace Dune {
  namespace PDELab {
 
 
    namespace Experimental {
 
      template<typename LFS>
      struct LeafLFSMixin
        : public TypeTree::LeafNode
      {
 
        const auto& finiteElement() const
        {
          return static_cast<const LFS*>(this)->tree().finiteElement();
        }
 
        template<typename Tree>
        struct Traits
        {
          using FiniteElement = typename Tree::FiniteElement;
          using FiniteElementType = FiniteElement;
        };
      };
 
      template<typename GFS, typename TreePath = TypeTree::HybridTreePath<>>
      class LocalFunctionSpace
        : public LeafLFSMixin<LocalFunctionSpace<GFS,TreePath>>
      {
 
      public:
 
        using Basis = typename GFS::Basis;
        using LocalView = typename Basis::LocalView;
        using Tree = TypeTree::ChildForTreePath<typename LocalView::Tree,TreePath>;
        using DOFIndex = typename GFS::Ordering::Traits::DOFIndex;
 
        template<typename LFS, typename C, typename Tag, bool fast>
        friend class Dune::PDELab::LFSIndexCacheBase;
 
        struct Traits
          : public LeafLFSMixin<LocalFunctionSpace<GFS,TreePath>>::template Traits<Tree>
        {
 
          using GridFunctionSpace = GFS;
          using GridView          = typename GFS::Traits::GridView;
          using SizeType          = std::size_t;
          using DOFIndex          = typename GFS::Ordering::Traits::DOFIndex;
          using ConstraintsType   = typename GFS::Traits::ConstraintsType;
 
        };
 
        using size_type = std::size_t;
 
        LocalFunctionSpace(std::shared_ptr<const GFS> gfs, TreePath tree_path = TreePath(), size_type offset = 0)
          : _gfs(gfs)
          , _local_view(gfs->basis().localView())
          , _tree_path(tree_path)
          , _tree(TypeTree::child(_local_view.tree(),tree_path))
        {}
 
        size_type subSpaceDepth() const
        {
          return 0;
        }
 
        size_type size () const
        {
          return _local_view.size();
        }
 
        size_type maxSize () const
        {
          // _dof_indices is always as large as the max local size of the root GFS
          return _local_view.maxSize();
        }
 
        size_type localIndex (size_type index) const
        {
          return _tree.localIndex(index);
        }
 
        // index: local dof index for the given element
        DOFIndex dofIndex(size_type index) const
        {
          auto refElement = Dune::ReferenceElements<double,Basis::GridView::dimension>::general(_local_view.element().type());
 
          auto localKey = _local_view.tree().finiteElement().localCoefficients().localKey(index);
 
          const auto& indexSet = _gfs->basis().gridView().indexSet();
 
          // get geometry type of subentity
          auto gt = refElement.type(localKey.subEntity(), localKey.codim());
 
          // evaluate consecutive index of subentity
          auto indexOnEntity = indexSet.subIndex(_local_view.element(),
                                                 localKey.subEntity(),
                                                 localKey.codim());
 
 
          DOFIndex result;
          GFS::Ordering::Traits::DOFIndexAccessor::store(result,gt,indexOnEntity,localKey.index());
          return result;
        }
 
        // index: local dof index for the given element
        auto containerIndex(size_type index) const
        {
          MultiIndex<std::size_t,1> result;
          result.set({_local_view.index(_tree.localIndex(index))});
          return result;
        }
 
        const GFS& gridFunctionSpace() const
        {
          return *_gfs;
        }
 
        void bind(const typename GFS::Traits::EntitySet::template Codim<0>::Entity& e)
        {
          _local_view.bind(e);
        }
 
        const typename Traits::ConstraintsType& constraints() const
        {
          return _gfs->constraints();
        }
 
        const Tree& tree() const
        {
          return _tree;
        }
 
      private:
 
        typename GFS::Ordering::Traits::ContainerIndex containerIndex(const DOFIndex& i) const
        {
          return _gfs->ordering().containerIndex(i);
        }
 
        std::shared_ptr<const GFS> _gfs;
        LocalView _local_view;
        TreePath _tree_path;
        const Tree& _tree;
 
      };
 
      // forward declare GridFunctionSpace
      template<typename DFBasis, typename V, typename CE=NoConstraints>
      class GridFunctionSpace;
 
 
    } // namespace Experimental
 
 
    template<typename DFBasis, typename V, typename CE, typename TAG>
    class LocalFunctionSpace<Experimental::GridFunctionSpace<DFBasis,V,CE>,TAG>
      : public Experimental::LocalFunctionSpace<Experimental::GridFunctionSpace<DFBasis,V,CE>>
    {
 
      using GFS = Experimental::GridFunctionSpace<DFBasis,V,CE>;
 
    public:
 
      LocalFunctionSpace(std::shared_ptr<const GFS> gfs)
        : Experimental::LocalFunctionSpace<GFS>(gfs)
      {}
 
      LocalFunctionSpace(const GFS& gfs)
        : Experimental::LocalFunctionSpace<GFS>(stackobject_to_shared_ptr(gfs))
      {}
 
    };
 
    template<typename DFBasis, typename V, typename CE>
    class LocalFunctionSpace<Experimental::GridFunctionSpace<DFBasis,V,CE>,AnySpaceTag>
      : public Experimental::LocalFunctionSpace<Experimental::GridFunctionSpace<DFBasis,V,CE>>
    {
 
      using GFS = Experimental::GridFunctionSpace<DFBasis,V,CE>;
 
    public:
 
      LocalFunctionSpace(std::shared_ptr<const GFS> gfs)
        : Experimental::LocalFunctionSpace<GFS>(gfs)
      {}
 
      LocalFunctionSpace(const GFS& gfs)
        : Experimental::LocalFunctionSpace<GFS>(stackobject_to_shared_ptr(gfs))
      {}
 
    };
 
  } // namespace PDELab
} // namespace Dune
 
#endif // DUNE_PDELAB_GRIDFUNCTIONSPACE_DUNEFUNCTIONSLOCALFUNCTIONSPACE_HH