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// $Id: mg_transfer_component.h 30253 2013-08-07 21:06:29Z bangerth $
//
// Copyright (C) 2001 - 2013 by the deal.II authors
//
// This file is part of the deal.II library.
//
// The deal.II library is free software; you can use it, redistribute
// it, and/or modify it under the terms of the GNU Lesser General
// Public License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
// The full text of the license can be found in the file LICENSE at
// the top level of the deal.II distribution.
//
// ---------------------------------------------------------------------
#ifndef __deal2__mg_transfer_component_h
#define __deal2__mg_transfer_component_h
#include <deal.II/base/config.h>
#include <deal.II/base/std_cxx1x/shared_ptr.h>
#include <deal.II/lac/block_vector.h>
#include <deal.II/lac/constraint_matrix.h>
#include <deal.II/lac/sparsity_pattern.h>
#include <deal.II/lac/block_sparsity_pattern.h>
#include <deal.II/lac/vector_memory.h>
#include <deal.II/base/mg_level_object.h>
#include <deal.II/dofs/dof_handler.h>
#include <deal.II/fe/component_mask.h>
#include <deal.II/multigrid/mg_base.h>
DEAL_II_NAMESPACE_OPEN
template <int dim, int spacedim> class DoFHandler;
/*
* MGTransferBase is defined in mg_base.h
*/
/*!@addtogroup mg */
/*@{*/
/**
* Implementation of matrix generation for component wise multigrid transfer.
*
* @note MGTransferBlockBase is probably the more logical
* class. Still eventually, a class should be developed allowing to
* select multiple components.
*
* @author Guido Kanschat, 2001-2003
*/
class MGTransferComponentBase
{
public:
/**
* Memory used by this object.
*/
std::size_t memory_consumption () const;
protected:
/**
* Actually build the prolongation
* matrices for each level.
*
* This function is only called
* by derived classes. These can
* also set the member variables
* <code>selected_component</code> and <code>mg_selected_component</code> member variables to
* restrict the transfer matrices
* to certain components.
* Furthermore, they use
* <code>target_component</code> and
* <code>mg_target_component</code> for
* re-ordering and grouping of
* components.
*/
template <int dim, int spacedim>
void build_matrices (const DoFHandler<dim,spacedim> &dof,
const DoFHandler<dim,spacedim> &mg_dof);
/**
* Flag of selected components.
*
* The transfer operators only act
* on the components having a
* <tt>true</tt> entry here. If
* renumbering by
* #target_component is used,
* this refers to the
* <b>renumbered</b> components.
*/
ComponentMask component_mask;
/**
* Flag of selected components.
*
* The transfer operators only act
* on the components having a
* <tt>true</tt> entry here. If
* renumbering by
* #mg_target_component is used,
* this refers to the
* <b>renumbered</b> components.
*/
ComponentMask mg_component_mask;
/**
* Target component of the
* fine-level vector if
* renumbering is required.
*/
std::vector<unsigned int> target_component;
/**
* Target component if
* renumbering of level vectors
* is required.
*/
std::vector<unsigned int> mg_target_component;
/**
* Sizes of the multi-level vectors.
*/
mutable std::vector<std::vector<types::global_dof_index> > sizes;
/**
* Start index of each component.
*/
std::vector<types::global_dof_index> component_start;
/**
* Start index of each component on
* all levels.
*/
std::vector<std::vector<types::global_dof_index> > mg_component_start;
/**
* Call build_matrices()
* function first.
*/
DeclException0(ExcMatricesNotBuilt);
private:
std::vector<std_cxx1x::shared_ptr<BlockSparsityPattern> > prolongation_sparsities;
protected:
/**
* The actual prolongation matrix.
* column indices belong to the
* dof indices of the mother cell,
* i.e. the coarse level.
* while row indices belong to the
* child cell, i.e. the fine level.
*/
std::vector<std_cxx1x::shared_ptr<BlockSparseMatrix<double> > > prolongation_matrices;
/**
* Holds the mapping for the
* <tt>copy_to/from_mg</tt>-functions.
* The data is first the global
* index, then the level index.
*/
std::vector<std::vector<std::pair<types::global_dof_index, unsigned int> > >
copy_to_and_from_indices;
/**
* Store the boundary_indices.
* These are needed for the
* boundary values in the
* restriction matrix.
*/
std::vector<std::set<types::global_dof_index> > boundary_indices;
};
//TODO:[GK] Update documentation for copy_* functions
//TODO: Use same kind of template argument as MGTransferSelect
/**
* Implementation of the MGTransferBase interface for block
* matrices and simple vectors. This class uses MGTransferComponentBase
* selecting a single component or grouping several components into a
* single block. The transfer operators themselves are implemented for
* Vector and BlockVector objects.
*
* See MGTransferBase to find out which of the transfer classes
* is best for your needs.
*
* @author Guido Kanschat, 2001, 2002, 2003
*/
template <typename number>
class MGTransferSelect : public MGTransferBase<Vector<number> >,
private MGTransferComponentBase
{
public:
/**
* Constructor without constraint
* matrices. Use this constructor
* only with discontinuous finite
* elements or with no local
* refinement.
*/
MGTransferSelect ();
/**
* Constructor with constraint matrices.
*/
MGTransferSelect (const ConstraintMatrix &constraints);
/**
* Destructor.
*/
virtual ~MGTransferSelect ();
//TODO: rewrite docs; make sure defaulted args are actually allowed
/**
* Actually build the prolongation
* matrices for grouped components.
*
* This function is a front-end
* for the same function in
* MGTransferComponentBase.
*
* @arg selected: Number of the
* block of the global vector
* to be copied from and to the
* multilevel vector. This number
* refers to the renumbering by
* <tt>target_component</tt>.
*
* @arg mg_selected: Number
* of the block for which the
* transfer matrices should be
* built.
*
* If <tt>mg_target_component</tt> is
* present, this refers to the
* renumbered components.
*
* @arg target_component: this
* argument allows grouping and
* renumbering of components in
* the fine-level vector (see
* DoFRenumbering::component_wise).
*
* @arg mg_target_component: this
* argument allows grouping and
* renumbering of components in
* the level vectors (see
* DoFRenumbering::component_wise). It
* also affects the behavior of
* the <tt>selected</tt> argument
*
* @arg boundary_indices: holds the
* boundary indices on each level.
*/
template <int dim, int spacedim>
void build_matrices (const DoFHandler<dim,spacedim> &dof,
const DoFHandler<dim,spacedim> &mg_dof,
unsigned int selected,
unsigned int mg_selected,
const std::vector<unsigned int> &target_component
= std::vector<unsigned int>(),
const std::vector<unsigned int> &mg_target_component
= std::vector<unsigned int>(),
const std::vector<std::set<types::global_dof_index> > &boundary_indices
= std::vector<std::set<types::global_dof_index> >()
);
/**
* Change selected
* component. Handle with care!
*/
void select (const unsigned int component,
const unsigned int mg_component = numbers::invalid_unsigned_int);
virtual void prolongate (const unsigned int to_level,
Vector<number> &dst,
const Vector<number> &src) const;
virtual void restrict_and_add (const unsigned int from_level,
Vector<number> &dst,
const Vector<number> &src) const;
/**
* Transfer from a vector on the
* global grid to a multilevel vector.
*/
template <int dim, typename number2, int spacedim>
void
copy_to_mg (const DoFHandler<dim,spacedim> &mg_dof,
MGLevelObject<Vector<number> > &dst,
const Vector<number2> &src) const;
/**
* Transfer from multilevel vector to
* normal vector.
*
* Copies data from active
* portions of an multilevel
* vector into the respective
* positions of a Vector.
*/
template <int dim, typename number2, int spacedim>
void
copy_from_mg (const DoFHandler<dim,spacedim> &mg_dof,
Vector<number2> &dst,
const MGLevelObject<Vector<number> > &src) const;
/**
* Add a multi-level vector to a
* normal vector.
*
* Works as the previous
* function, but probably not for
* continuous elements.
*/
template <int dim, typename number2, int spacedim>
void
copy_from_mg_add (const DoFHandler<dim,spacedim> &mg_dof,
Vector<number2> &dst,
const MGLevelObject<Vector<number> > &src) const;
/**
* Transfer from a vector on the
* global grid to multilevel vectors.
*/
template <int dim, typename number2, int spacedim>
void
copy_to_mg (const DoFHandler<dim,spacedim> &mg_dof,
MGLevelObject<Vector<number> > &dst,
const BlockVector<number2> &src) const;
/**
* Transfer from multilevel vector to
* normal vector.
*
* Copies data from active
* portions of a multilevel
* vector into the respective
* positions of a global
* BlockVector.
*/
template <int dim, typename number2, int spacedim>
void
copy_from_mg (const DoFHandler<dim,spacedim> &mg_dof,
BlockVector<number2> &dst,
const MGLevelObject<Vector<number> > &src) const;
/**
* Add a multi-level vector to a
* normal vector.
*
* Works as the previous
* function, but probably not for
* continuous elements.
*/
template <int dim, typename number2, int spacedim>
void
copy_from_mg_add (const DoFHandler<dim,spacedim> &mg_dof,
BlockVector<number2> &dst,
const MGLevelObject<Vector<number> > &src) const;
/**
* Memory used by this object.
*/
std::size_t memory_consumption () const;
private:
/**
* Implementation of the public
* function.
*/
template <int dim, class OutVector, int spacedim>
void
do_copy_from_mg (const DoFHandler<dim,spacedim> &mg_dof,
OutVector &dst,
const MGLevelObject<Vector<number> > &src) const;
/**
* Implementation of the public
* function.
*/
template <int dim, class OutVector, int spacedim>
void
do_copy_from_mg_add (const DoFHandler<dim,spacedim> &mg_dof,
OutVector &dst,
const MGLevelObject<Vector<number> > &src) const;
/**
* Actual implementation of
* copy_to_mg().
*/
template <int dim, class InVector, int spacedim>
void
do_copy_to_mg (const DoFHandler<dim,spacedim> &mg_dof,
MGLevelObject<Vector<number> > &dst,
const InVector &src) const;
/**
* Selected component of global vector.
*/
unsigned int selected_component;
/**
* Selected component inside multigrid.
*/
unsigned int mg_selected_component;
/**
* The degrees of freedom on the
* the refinement edges. For each
* level (outer vector) and each
* dof index (inner vector), this
* bool is true if the level
* degree of freedom is on the
* refinement edge towards the
* lower level excluding boundary dofs.
*/
std::vector<std::vector<bool> > interface_dofs;
/**
* The constraints of the global
* system.
*/
public:
SmartPointer<const ConstraintMatrix> constraints;
};
/*@}*/
//---------------------------------------------------------------------------
template <typename number>
inline void
MGTransferSelect<number>::select(const unsigned int component,
const unsigned int mg_component)
{
selected_component = component;
mg_selected_component = (mg_component == numbers::invalid_unsigned_int)
? component
: mg_component;
}
DEAL_II_NAMESPACE_CLOSE
#endif
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