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<?php
/**
* CodeIgniter
*
* An open source application development framework for PHP
*
* This content is released under the MIT License (MIT)
*
* Copyright (c) 2014 - 2019, British Columbia Institute of Technology
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
* @package CodeIgniter
* @author EllisLab Dev Team
* @copyright Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)
* @copyright Copyright (c) 2014 - 2019, British Columbia Institute of Technology (https://bcit.ca/)
* @license https://opensource.org/licenses/MIT MIT License
* @link https://codeigniter.com
* @since Version 1.0.0
* @filesource
*/
defined('BASEPATH') OR exit('No direct script access allowed');
/**
* CodeIgniter Driver Library Class
*
* This class enables you to create "Driver" libraries that add runtime ability
* to extend the capabilities of a class via additional driver objects
*
* @package CodeIgniter
* @subpackage Libraries
* @category Libraries
* @author EllisLab Dev Team
* @link
*/
class CI_Driver_Library {
/**
* Array of drivers that are available to use with the driver class
*
* @var array
*/
protected $valid_drivers = array();
/**
* Name of the current class - usually the driver class
*
* @var string
*/
protected $lib_name;
/**
* Get magic method
*
* The first time a child is used it won't exist, so we instantiate it
* subsequents calls will go straight to the proper child.
*
* @param string Child class name
* @return object Child class
*/
public function __get($child)
{
// Try to load the driver
return $this->load_driver($child);
}
/**
* Load driver
*
* Separate load_driver call to support explicit driver load by library or user
*
* @param string Driver name (w/o parent prefix)
* @return object Child class
*/
public function load_driver($child)
{
// Get CodeIgniter instance and subclass prefix
$prefix = config_item('subclass_prefix');
if ( ! isset($this->lib_name))
{
// Get library name without any prefix
$this->lib_name = str_replace(array('CI_', $prefix), '', get_class($this));
}
// The child will be prefixed with the parent lib
$child_name = $this->lib_name.'_'.$child;
// See if requested child is a valid driver
if ( ! in_array($child, $this->valid_drivers))
{
// The requested driver isn't valid!
$msg = 'Invalid driver requested: '.$child_name;
log_message('error', $msg);
show_error($msg);
}
// Get package paths and filename case variations to search
$CI = get_instance();
$paths = $CI->load->get_package_paths(TRUE);
// Is there an extension?
$class_name = $prefix.$child_name;
$found = class_exists($class_name, FALSE);
if ( ! $found)
{
// Check for subclass file
foreach ($paths as $path)
{
// Does the file exist?
$file = $path.'libraries/'.$this->lib_name.'/drivers/'.$prefix.$child_name.'.php';
if (file_exists($file))
{
// Yes - require base class from BASEPATH
$basepath = BASEPATH.'libraries/'.$this->lib_name.'/drivers/'.$child_name.'.php';
if ( ! file_exists($basepath))
{
$msg = 'Unable to load the requested class: CI_'.$child_name;
log_message('error', $msg);
show_error($msg);
}
// Include both sources and mark found
include_once($basepath);
include_once($file);
$found = TRUE;
break;
}
}
}
// Do we need to search for the class?
if ( ! $found)
{
// Use standard class name
$class_name = 'CI_'.$child_name;
if ( ! class_exists($class_name, FALSE))
{
// Check package paths
foreach ($paths as $path)
{
// Does the file exist?
$file = $path.'libraries/'.$this->lib_name.'/drivers/'.$child_name.'.php';
if (file_exists($file))
{
// Include source
include_once($file);
break;
}
}
}
}
// Did we finally find the class?
if ( ! class_exists($class_name, FALSE))
{
if (class_exists($child_name, FALSE))
{
$class_name = $child_name;
}
else
{
$msg = 'Unable to load the requested driver: '.$class_name;
log_message('error', $msg);
show_error($msg);
}
}
// Instantiate, decorate and add child
$obj = new $class_name();
$obj->decorate($this);
$this->$child = $obj;
return $this->$child;
}
}
// --------------------------------------------------------------------------
/**
* CodeIgniter Driver Class
*
* This class enables you to create drivers for a Library based on the Driver Library.
* It handles the drivers' access to the parent library
*
* @package CodeIgniter
* @subpackage Libraries
* @category Libraries
* @author EllisLab Dev Team
* @link
*/
class CI_Driver {
/**
* Instance of the parent class
*
* @var object
*/
protected $_parent;
/**
* List of methods in the parent class
*
* @var array
*/
protected $_methods = array();
/**
* List of properties in the parent class
*
* @var array
*/
protected $_properties = array();
/**
* Array of methods and properties for the parent class(es)
*
* @static
* @var array
*/
protected static $_reflections = array();
/**
* Decorate
*
* Decorates the child with the parent driver lib's methods and properties
*
* @param object
* @return void
*/
public function decorate($parent)
{
$this->_parent = $parent;
// Lock down attributes to what is defined in the class
// and speed up references in magic methods
$class_name = get_class($parent);
if ( ! isset(self::$_reflections[$class_name]))
{
$r = new ReflectionObject($parent);
foreach ($r->getMethods() as $method)
{
if ($method->isPublic())
{
$this->_methods[] = $method->getName();
}
}
foreach ($r->getProperties() as $prop)
{
if ($prop->isPublic())
{
$this->_properties[] = $prop->getName();
}
}
self::$_reflections[$class_name] = array($this->_methods, $this->_properties);
}
else
{
list($this->_methods, $this->_properties) = self::$_reflections[$class_name];
}
}
// --------------------------------------------------------------------
/**
* __call magic method
*
* Handles access to the parent driver library's methods
*
* @param string
* @param array
* @return mixed
*/
public function __call($method, $args = array())
{
if (in_array($method, $this->_methods))
{
return call_user_func_array(array($this->_parent, $method), $args);
}
throw new BadMethodCallException('No such method: '.$method.'()');
}
// --------------------------------------------------------------------
/**
* __get magic method
*
* Handles reading of the parent driver library's properties
*
* @param string
* @return mixed
*/
public function __get($var)
{
if (in_array($var, $this->_properties))
{
return $this->_parent->$var;
}
}
// --------------------------------------------------------------------
/**
* __set magic method
*
* Handles writing to the parent driver library's properties
*
* @param string
* @param array
* @return mixed
*/
public function __set($var, $val)
{
if (in_array($var, $this->_properties))
{
$this->_parent->$var = $val;
}
}
}