/* Copyright (C) 2010 Curtis Gedak
 *
 *  This program 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.
 *
 *  This program 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 more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, see <http://www.gnu.org/licenses/>.
 */


/* Proc_Partitions_Info
 * 
 * A persistent cache of information from the file /proc/partitions
 * that helps to minimize the number of required disk reads.
 */

#ifndef GPARTED_PROC_PARTITIONS_INFO_H
#define GPARTED_PROC_PARTITIONS_INFO_H


#include "BlockSpecial.h"

#include <glibmm/ustring.h>
#include <vector>


namespace GParted
{


struct DeviceAndPartitionNames
{
	Glib::ustring              m_device_name;
	std::vector<Glib::ustring> m_partition_names;

	DeviceAndPartitionNames(const Glib::ustring& devname, const std::vector<Glib::ustring>& ptnnames)
	 : m_device_name(devname), m_partition_names(ptnnames)
	{};
};


class Proc_Partitions_Info
{
public:
	static void load_cache();
	static const std::vector<Glib::ustring> & get_device_paths();
	static std::vector<DeviceAndPartitionNames> get_device_and_partition_names_for(
	                const std::vector<Glib::ustring>& device_names);

private:
	static void initialize_if_required();
	static void load_proc_partitions_info_cache();
	static bool is_whole_disk_device_name(const Glib::ustring& name);
	static std::vector<Glib::ustring> get_partition_paths_for(const Glib::ustring& name);
	static bool is_partition_of_device(const Glib::ustring& partname, const Glib::ustring& devname);

	static bool proc_partitions_info_cache_initialized ;
	static std::vector<BlockSpecial> all_entries_cache;
	static std::vector<Glib::ustring> device_paths_cache ;
};


}  // namespace GParted


#endif /* GPARTED_PROC_PARTITIONS_INFO_H */
