/* This file is part of Raul.
 * Copyright (C) 2007 Dave Robillard <http://drobilla.net>
 * 
 * Raul is free software; you can redistribute it and/or modify it under the
 * terms of the GNU General Public License as published by the Free Software
 * Foundation; either version 2 of the License, or (at your option) any later
 * version.
 * 
 * Raul 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 details.
 * 
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include <iostream>
#include <cassert>
#include <rasqal.h>
#include "raul/RDFQuery.h"

namespace Raul {


RDFQuery::Results
RDFQuery::run(const Glib::ustring base_uri_str) const
{
	Results result;

	rasqal_init();

	rasqal_query *rq = rasqal_new_query("sparql", NULL);

	raptor_uri* base_uri = NULL;
	if (base_uri_str != "")
		base_uri = raptor_new_uri((const unsigned char*)base_uri_str.c_str());
	rasqal_query_prepare(rq, (unsigned char*)_query.c_str(), base_uri);

	rasqal_query_results* results = rasqal_query_execute(rq);
	
	if (!results)
		return result; /* Return an empty Results */

	while (!rasqal_query_results_finished(results)) {
		
		Bindings bindings;
		
		for (int i=0; i < rasqal_query_results_get_bindings_count(results); i++) {
			const unsigned char* rname  = rasqal_query_results_get_binding_name(results, i);
			rasqal_literal*      rvalue = rasqal_query_results_get_binding_value(results, i);
			Glib::ustring name((const char*)rname);

			const unsigned char* str = rasqal_literal_as_string(rvalue);

			if (str) {
				Glib::ustring value((const char*)str);
				bindings.insert(std::make_pair(name, value));
			}
		}

		result.push_back(bindings);
		rasqal_query_results_next(results);
	}

	rasqal_free_query_results(results);
	rasqal_free_query(rq);
	
	if (base_uri)
		raptor_free_uri(base_uri);

	rasqal_finish();

	return result;
}


} // namespace Raul