Subversion-Projekte lars-tiefland.ci

<?php
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP
 *
 * This content is released under the MIT License (MIT)
 *
 * Copyright (c) 2014 - 2017, 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 - 2017, British Columbia Institute of Technology (http://bcit.ca/)
 * @license     http://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;
                }
        }

}