field_constant_impl.hh

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/*
 * field_constant_impl.hh
 *
 *  Created on: Dec 15, 2012
 *      Author: jb
 */

#ifndef FIELD_CONSTANT_IMPL_HH_
#define FIELD_CONSTANT_IMPL_HH_

#include "fields/field_constant.hh"
#include "input/input_type.hh"


//#include <boost/type_traits.hpp>

/// Implementation.

namespace it = Input::Type;

template <int spacedim, class Value>
it::Record FieldConstant<spacedim, Value>::input_type
    = FieldConstant<spacedim, Value>::get_input_type(FieldBase<spacedim, Value>::input_type, NULL);


template <int spacedim, class Value>
Input::Type::Record FieldConstant<spacedim, Value>::get_input_type(
        Input::Type::AbstractRecord &a_type, const typename Value::ElementInputType *eit
        )
{
    it::Record type=
        it::Record("FieldConstant", FieldBase<spacedim,Value>::template_name()+" Field constant in space.")
        .derive_from(a_type)
        .declare_key("value", Value::get_input_type(eit), it::Default::obligatory(),
                                    "Value of the constant field.\n"
                                    "For vector values, you can use scalar value to enter constant vector.\n"
                                    "For square NxN-matrix values, you can use:\n"
                                    "* vector of size N to enter diagonal matrix\n"
                                    "* vector of size (N+1)*N/2 to enter symmetric matrix (upper triangle, row by row)\n"
                                    "* scalar to enter multiple of the unit matrix." )
        .allow_auto_conversion("value");

    return type;
}



template <int spacedim, class Value>
FieldConstant<spacedim, Value>::FieldConstant( unsigned int n_comp)
: FieldBase<spacedim, Value>(n_comp)
{}


template <int spacedim, class Value>
FieldConstant<spacedim, Value> &FieldConstant<spacedim, Value>::set_value(const typename Value::return_type &val)
{
    this->r_value_ = val;

    return *this;
}


template <int spacedim, class Value>
void FieldConstant<spacedim, Value>::init_from_input(const Input::Record &rec) {
    this->value_.init_from_input( rec.val<typename Value::AccessType>("value") );
}



/**
 * Returns one value in one given point. ResultType can be used to avoid some costly calculation if the result is trivial.
 */
template <int spacedim, class Value>
typename Value::return_type const & FieldConstant<spacedim, Value>::value(const Point &p, const ElementAccessor<spacedim> &elm)
{
    return this->r_value_;
}



/**
 * Returns std::vector of scalar values in several points at once.
 */
template <int spacedim, class Value>
void FieldConstant<spacedim, Value>::value_list (const std::vector< Point >  &point_list, const ElementAccessor<spacedim> &elm,
                   std::vector<typename Value::return_type>  &value_list)
{
    ASSERT_EQUAL( point_list.size(), value_list.size() );
    for(unsigned int i=0; i< point_list.size(); i++)
        value_list[i]=this->r_value_;
}



template <int spacedim, class Value>
FieldConstant<spacedim, Value>::~FieldConstant() {
}



#endif /* FIELD_CONSTANT_IMPL_HH_ */