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