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/*****************************************************************************
*
* This file is part of Mapnik (c++ mapping toolkit)
*
* Copyright (C) 2012 Artem Pavlenko
*
* This library is free software; you can 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.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*****************************************************************************/
#include <mapnik/feature_kv_iterator.hpp>
#include <mapnik/feature.hpp>
#include <boost/optional.hpp>
namespace mapnik {
feature_kv_iterator::feature_kv_iterator (feature_impl const& f, bool begin)
: f_(f),
itr_( begin ? f_.ctx_->begin() : f_.ctx_->end()) {}
void feature_kv_iterator::increment()
{
++itr_;
}
void feature_kv_iterator::decrement()
{
// dummy //--itr_;
}
void feature_kv_iterator::advance(boost::iterator_difference<feature_kv_iterator>::type )
{
// dummy
}
bool feature_kv_iterator::equal( feature_kv_iterator const& other) const
{
return ( itr_ == other.itr_);
}
feature_kv_iterator::value_type const& feature_kv_iterator::dereference() const
{
boost::get<0>(kv_) = itr_->first;
boost::optional<mapnik::value const&> val = f_.get_optional(itr_->second);
if (val) boost::get<1>(kv_) = *val;
else boost::get<1>(kv_) = value_null();
return kv_;
}
} // endof mapnik namespace
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