fe_value_handler.hh

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/*!
 *
 * Copyright (C) 2015 Technical University of Liberec.  All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License version 3 as published by the
 * Free Software Foundation. (http://www.gnu.org/licenses/gpl-3.0.en.html)
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
 *
 *
 * @file    fe_value_handler.hh
 * @brief
 */

#ifndef FE_VALUE_HANDLER_HH_
#define FE_VALUE_HANDLER_HH_

#include "fields/vec_seq_double.hh"
#include "fields/field_values.hh"
#include "fem/mapping_p1.hh"
#include "fem/finite_element.hh"
#include "mesh/point.hh"
#include "mesh/long_idx.hh"
#include <armadillo>

template <int spacedim> class ElementAccessor;


/// Initialization structure of FEValueHandler class.
struct FEValueInitData
{
    /// DOF handler object
    std::shared_ptr<DOFHandlerMultiDim> dh;
    /// Store data of Field
    VectorSeqDouble *data_vec;
    /// number of dofs
    unsigned int ndofs;
    /// number of components
    unsigned int n_comp;
};

/**
 * Helper class that allows compute finite element values specified by element dimension.
 */
template <int elemdim, int spacedim, class Value>
class FEValueHandler
{
public:
    typedef typename Space<spacedim>::Point Point;

    /// Constructor.
    FEValueHandler();

    /// Initialize data members
    void initialize(FEValueInitData init_data, MappingP1<elemdim,3> *map = nullptr);
    /// Return mapping object
    inline MappingP1<elemdim,3> *get_mapping() {
        return map_;
    }
    /// Returns one value in one given point.
    typename Value::return_type const &value(const Point &p, const ElementAccessor<spacedim> &elm);
    /// Returns std::vector of scalar values in several points at once.
    void value_list (const std::vector< Point >  &point_list, const ElementAccessor<spacedim> &elm,
                       std::vector<typename Value::return_type> &value_list);

    /// Destructor.
    ~FEValueHandler();
private:
    /// DOF handler object
    std::shared_ptr<DOFHandlerMultiDim> dh_;
    /// Store data of Field
    VectorSeqDouble *data_vec_;
    /// Array of indexes to data_vec_, used for get/set values
    std::vector<LongIdx> dof_indices;
    /// Last value, prevents passing large values (vectors) by value.
    Value value_;
    typename Value::return_type r_value_;
    /// Mapping object.
    MappingP1<elemdim,3> *map_;
};


/**
 * Specialization for elements with dim==0.
 */
template <int spacedim, class Value>
class FEValueHandler<0, spacedim, Value>
{
public:
    typedef typename Space<spacedim>::Point Point;

    /// Constructor.
    FEValueHandler()
    : value_(r_value_) {}

    /// Initialize data members
    void initialize(FEValueInitData init_data);
    /// Returns one value in one given point.
    typename Value::return_type const &value(const Point &p, const ElementAccessor<spacedim> &elm) {
        std::vector<Point> point_list;
        point_list.push_back(p);
        std::vector<typename Value::return_type> v_list;
        v_list.push_back(r_value_);
        this->value_list(point_list, elm, v_list);
        this->r_value_ = v_list[0];
        return this->r_value_;
    }

    /// Returns std::vector of scalar values in several points at once.
    void value_list (const std::vector< Point >  &point_list, const ElementAccessor<spacedim> &elm,
                       std::vector<typename Value::return_type> &value_list);

    /// Destructor.
    ~FEValueHandler() {}
private:
    /// DOF handler object
    std::shared_ptr<DOFHandlerMultiDim> dh_;
    /// Store data of Field
    VectorSeqDouble *data_vec_;
    /// Array of indexes to data_vec_, used for get/set values
    std::vector<LongIdx> dof_indices;
    /// Last value, prevents passing large values (vectors) by value.
    Value value_;
    typename Value::return_type r_value_;
};



#endif /* FE_VALUE_HANDLER_HH_ */