ci-bonfire / Sprint

system/libraries/Driver.php

<?php

For compatibility and reusability of your code, PSR1 recommends that a file should introduce either new symbols (like classes, functions, etc.) or have side-effects (like outputting something, or including other files), but not both at the same time. The first symbol is defined on line 52 and the first side effect is on line 38.

/**
 * CodeIgniter
 *
 * An open source application development framework for PHP
 *
 * This content is released under the MIT License (MIT)
 *
 * Copyright (c) 2014 - 2015, 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. (http://ellislab.com/)
 * @copyright	Copyright (c) 2014 - 2015, British Columbia Institute of Technology (http://bcit.ca/)
 * @license	http://opensource.org/licenses/MIT	MIT License
 * @link	http://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;
		}
	}

}