<?php
/*
	+-----------------------------------------------------------------------------+
	| ILIAS open source                                                           |
	+-----------------------------------------------------------------------------+
	| Copyright (c) 1998-2006 ILIAS open source, University of Cologne            |
	|                                                                             |
	| 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, write to the Free Software                 |
	| Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA. |
	+-----------------------------------------------------------------------------+
*/


/**
* Class ilObjectAccess
*
* This class contains methods that check object specific conditions
* for access to objects. Every object type should provide an
* inherited class called ilObj<TypeName>Access
*
* @author Alex Killing <alex.killing@gmx.de>
* @version $Id: class.ilObjectAccess.php 17817 2008-11-04 11:05:38Z smeyer $
*
*/
class ilObjectAccess
{
	/**
	* Checks wether a user may invoke a command or not
	* (this method is called by ilAccessHandler::checkAccess)
	*
	* Please do not check any preconditions handled by
	* ilConditionHandler here. Also don't do any RBAC checks.
	*
	* @param	string		$a_cmd			command (not permission!)
 	* @param	string		$a_permission	permission
	* @param	int			$a_ref_id		reference id
	* @param	int			$a_obj_id		object id
	* @param	int			$a_user_id		user id (if not provided, current user is taken)
	*
	* @return	boolean		true, if everything is ok
	*/
	function _checkAccess($a_cmd, $a_permission, $a_ref_id, $a_obj_id, $a_user_id = "")
	{
		global $ilUser, $ilAccess;

		if ($a_user_id == "")
		{
			$a_user_id = $ilUser->getId();
		}

		// add no access info item and return false if access is not granted
		// $ilAccess->addInfoItem(IL_NO_OBJECT_ACCESS, $a_text, $a_data = "");
		//
		// for all RBAC checks use checkAccessOfUser instead the normal checkAccess-method:
		// $rbacsystem->checkAccessOfUser($a_user_id, $a_permission, $a_ref_id)

		return true;
	}

	/**
	* check condition
	*
	* this method is called by ilConditionHandler
	*/
	function _checkCondition($a_obj_id, $a_operator, $a_value, $a_usr_id = 0)
	{
		switch($a_operator)
		{
			default:
				return true;
		}
	}
	
	/**
	 * get commands
	 * 
	 * this method returns an array of all possible commands/permission combinations
	 * 
	 * example:	
	 * $commands = array
	 *	(
	 *		array("permission" => "read", "cmd" => "view", "lang_var" => "show"),
	 *		array("permission" => "write", "cmd" => "edit", "lang_var" => "edit"),
	 *	);
	 */
	function _getCommands()
	{
		$commands = array
		(
			array()
		);
		
		return $commands;
	}
	
	/**
	* check whether goto script will succeed
	*/
	function _checkGoto($a_target)
	{
		global $ilAccess;
		
		$t_arr = explode("_", $a_target);

		if ($ilAccess->checkAccess("read", "", $t_arr[1]))
		{
			return true;
		}
		return false;
	}

}

?>
