75 lines
2 KiB
C++
75 lines
2 KiB
C++
/*****************************************************************************
|
|
*
|
|
* This file is part of Mapnik (c++ mapping toolkit)
|
|
*
|
|
* Copyright (C) 2006 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
|
|
*
|
|
*****************************************************************************/
|
|
|
|
//$Id$
|
|
|
|
#ifndef PROPERTY_VALIDATOR
|
|
#define PROPERTY_VALIDATOR
|
|
|
|
#include "filter.hh"
|
|
#include "expression.hh"
|
|
#include <set>
|
|
|
|
namespace mapnik
|
|
{
|
|
template <typename FeatureT>
|
|
class property_validator : public filter_visitor<FeatureT>
|
|
{
|
|
public:
|
|
property_validator(layer_descriptor& desc)
|
|
desc_(desc) {}
|
|
|
|
void visit(filter<FeatureT>& /*filter*/)
|
|
{
|
|
//not interested
|
|
}
|
|
void visit(expression<FeatureT>& exp)
|
|
{
|
|
property<FeatureT>* pf;
|
|
if ((pf = dynamic_cast<property<FeatureT>*>(&exp)))
|
|
{
|
|
vector<attribute_descriptor> const& attr_desc = desc_.get_descriptors();
|
|
for (size_t idx=0; idx < attr_desc.size();++idx)
|
|
{
|
|
if (attr_desc[idx] == pf->name())
|
|
{
|
|
pf->set_index(idx);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
std::set<std::string> const& property_names() const
|
|
{
|
|
return names_;
|
|
}
|
|
|
|
virtual ~property_validator() {}
|
|
private:
|
|
property_validator(property_validator const&);
|
|
property_validator& operator=(property_validator const&);
|
|
private:
|
|
layer_descriptor& desc_;
|
|
};
|
|
}
|
|
|
|
#endif //PROPERTY_HPP
|