mapnik/src/metawriter_factory.cpp

/*****************************************************************************
 *
 * This file is part of Mapnik (c++ mapping toolkit)
 *
 * Copyright (C) 2011 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
 *
 *****************************************************************************/
//$Id$

#include <mapnik/metawriter_factory.hpp>
#include <mapnik/metawriter_json.hpp>
#include <mapnik/metawriter_inmem.hpp>
#include <mapnik/xml_tree.hpp>
#include <mapnik/ptree_helpers.hpp>
#include <mapnik/config_error.hpp>

#include <boost/optional.hpp>

using boost::optional;
using std::string;

namespace mapnik
{

metawriter_ptr
metawriter_create(xml_node const& pt)
{
    metawriter_ptr writer;
    string type = pt.get_attr<string>("type");

    optional<string> properties = pt.get_opt_attr<string>("default-output");
    if (type == "json") {
        string file = pt.get_attr<string>("file");
        metawriter_json_ptr json = metawriter_json_ptr(new metawriter_json(properties, parse_path(file)));
        optional<boolean> output_empty = pt.get_opt_attr<boolean>("output-empty");
        if (output_empty) {
            json->set_output_empty(*output_empty);
        }

        optional<boolean> pixel_coordinates = pt.get_opt_attr<boolean>("pixel-coordinates");
        if (pixel_coordinates) {
            json->set_pixel_coordinates(*pixel_coordinates);
        }
        writer = json;

    } else if (type == "inmem") {
        metawriter_inmem_ptr inmem = metawriter_inmem_ptr(new metawriter_inmem(properties));
        writer = inmem;
    } else {
        throw config_error(string("Unknown type '") + type + "'", &pt);
    }

    return writer;
}

void
metawriter_save(const metawriter_ptr &metawriter,
                boost::property_tree::ptree &metawriter_node, bool explicit_defaults)
{

    metawriter_json *json = dynamic_cast<metawriter_json *>(metawriter.get());
    if (json) {
        set_attr(metawriter_node, "type", "json");
        std::string const& filename = path_processor_type::to_string(*(json->get_filename()));
        if (!filename.empty() || explicit_defaults) {
            set_attr(metawriter_node, "file", filename);
        }
    }

    metawriter_inmem *inmem = dynamic_cast<metawriter_inmem *>(metawriter.get());
    if (inmem) {
        set_attr(metawriter_node, "type", "inmem");
    }

    if (!metawriter->get_default_properties().empty() || explicit_defaults) {
        set_attr(metawriter_node, "default-output", metawriter->get_default_properties().to_string());
    }
}

} // namespace mapnik