<?php

/* PHP Application Command
 * 
 * This file is designed to be the central point of an application and to not
 * require user editing.
 *
 * Classes using this for intercommunication must conform to
 * the standards as set out in the Class_Template.class file
 * 
 * Note programmers can set a DEFAULT_CLASS variable, as the class
 * to call if none is specified
 * 
 * Date : 20030311 
 * @Author	Cameron Green	me at camerongreen dot org
 *
 * History :
 * me at camerongreen dot org : 20030320 : Added type checking, default class etc
 * me at camerongreen dot org : 20030601 : Added more commenting
 */

require_once('Config.inc');
require_once('Parameters.class');

// allow different dir seperators
if (!defined('DIR_SEPERATOR')) {
	define('DIR_SEPERATOR', '/');
}

$parameters = new Parameters();

/* If class returns false, hasn't been set or is of wrong type
 * try to set default, otherwise bail out!
 */
if (!$parameters->check('class', 'string', 1, 50)) {

	// see if a default class is specified
	if (defined('DEFAULT_CLASS')) {
		$class = DEFAULT_CLASS;
	}
	else {
		// check if its just a type problem
		if ($parameters->is_error()) {
			die("Incorrect type for class parameter : " . $parameters->get_last_error_message());
		}
		else {
			die("Missing class parameter.");
		}
	}
}
else {
	// everything is fine, put it into a variable
	$class = $parameters->get('class');
}

// debugging code
//error_log($parameters->to_string(), 0);

/* make sure the class actually exists as a file
 * note this means strict class to file name mappings
 * as it should be 
 */
if ((strpos($class, DIR_SEPERATOR) !== FALSE)
	|| !file_exists(".." . DIR_SEPERATOR . "include" . DIR_SEPERATOR . $class . '.class')) {
	die("Error calling $class.");
}

/* include the class, note this is where have your include path wrong
 * or allowing urls to be opened from the web could cause trouble
 * hence the check above
 */
require_once("$class.class");

// 1 % chance could be file with no class in it
if (!class_exists($class)) {
	die("Error creating $class.");
}

// dynamically create the class object
$class_object = new $class;

require_once("Type.class");

$type = new Type();

/* as long as we have an object, we are ready to hand off reponsibility
 * to the requested class
 */
if ($type->check($class_object, 'object')) {
	// send parameters to its 'main' function
	// get the output back, one might ask why I don't inst
	$result = $class_object->main($parameters);

	// if we have a string back, print out the returned code
	if ($type->check($result, 'string', 1)) {
		print ($result);
	}
	else {
		die($type->get_last_error_message());
	}
}
else {
	die("Faulty class instantion.");
}

?>