mirror of https://github.com/flightphp/core
Mike Cao
14 years ago
parent
8af17f2215
commit
e2f1dc99bb
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<?php
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/**
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* Flight: An extensible micro-framework.
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*
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* @copyright Copyright (c) 2011, Mike Cao <mike@mikecao.com>
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* @license http://www.opensource.org/licenses/mit-license.php
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*/
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namespace flight\core;
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/**
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* The Dispatcher class is responsible for dispatching events. Events
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* are simply aliases for class methods or functions. The Dispatcher
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* allows you to hook other function to an event that can modify the
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* input parameters and/or the output.
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*/
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class Dispatcher {
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/**
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* Mapped events.
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*
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* @var array
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*/
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protected $events = array();
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/**
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* Method filters.
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*
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* @var array
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*/
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protected $filters = array();
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public function __construct() {}
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/**
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* Dispatches an event.
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*
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* @param string $name Event name
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* @param array $params Callback parameters
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*/
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public function run($name, $params) {
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$output = '';
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// Run pre-filters
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if (!empty($this->filters[$name]['before'])) {
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$this->filter($this->filters[$name]['before'], $params, $output);
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}
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// Run requested method
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$output = $this->execute($this->get($name), $params);
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// Run post-filters
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if (!empty($this->filters[$name]['after'])) {
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$this->filter($this->filters[$name]['after'], $params, $output);
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}
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return $output;
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}
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/**
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* Assigns a callback to an event.
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*
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* @param string $name Event name
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* @param callback $callback Callback function
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*/
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public function set($name, $callback) {
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$this->events[$name] = $callback;
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}
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/**
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* Gets an assigned callback.
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*
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* @param string $name Event name
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* @param callback $callback Callback function
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*/
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public function get($name) {
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return $this->events[$name];
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}
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/**
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* Hooks a callback to an event.
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*
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* @param string $event Event name
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* @param string $type Filter type
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* @param callback $callback Callback function
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*/
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public function hook($name, $type, $callback) {
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$this->filters[$name][$type][] = $callback;
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}
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/**
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* Executes a chain of method filters.
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*
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* @param array $filters Chain of filters
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* @param reference $data Method parameters or method output
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*/
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public function filter($filters, &$params, &$output) {
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$args = array(&$params, &$output);
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foreach ($filters as $callback) {
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$continue = $this->execute($callback, $args);
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if ($continue === false) break;
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}
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}
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/**
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* Executes a callback function.
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*
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* @param callback $callback Callback function
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* @param array $params Function parameters
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* @return mixed Function results
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*/
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public static function execute($callback, array &$params = array()) {
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if (is_callable($callback)) {
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return is_array($callback) ?
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self::invokeMethod($callback, $params) :
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self::callFunction($callback, $params);
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}
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}
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/**
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* Calls a function.
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*
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* @param string $func Name of function to call
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* @param array $params Function parameters
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*/
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public static function callFunction($func, array &$params = array()) {
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switch (count($params)) {
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case 0:
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return $func();
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case 1:
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return $func($params[0]);
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case 2:
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return $func($params[0], $params[1]);
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case 3:
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return $func($params[0], $params[1], $params[2]);
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case 4:
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return $func($params[0], $params[1], $params[2], $params[3]);
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case 5:
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return $func($params[0], $params[1], $params[2], $params[3], $params[4]);
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default:
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return call_user_func_array($func, $params);
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}
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}
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/**
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* Invokes a method.
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*
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* @param mixed $func Class method
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* @param array $params Class method parameters
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*/
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public static function invokeMethod($func, array &$params = array()) {
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list($class, $method) = $func;
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switch (count($params)) {
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case 0:
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return $class::$method();
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case 1:
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return $class::$method($params[0]);
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case 2:
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return $class::$method($params[0], $params[1]);
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case 3:
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return $class::$method($params[0], $params[1], $params[2]);
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case 4:
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return $class::$method($params[0], $params[1], $params[2], $params[3]);
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case 5:
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return $class::$method($params[0], $params[1], $params[2], $params[3], $params[4]);
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default:
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return call_user_func_array($func, $params);
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}
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}
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}
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?>
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@ -0,0 +1,173 @@
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<?php
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/**
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* Flight: An extensible micro-framework.
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*
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* @copyright Copyright (c) 2011, Mike Cao <mike@mikecao.com>
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* @license http://www.opensource.org/licenses/mit-license.php
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*/
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namespace flight\core;
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/**
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* The Loader class is resonsible for loading objects. It maintains
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* a list of reusable class instances and can generate a new class
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* instances with custom initialization parameters. It also performs
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* class autoloading.
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*/
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class Loader {
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/**
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* Registered classes.
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*
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* @var array
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*/
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protected $classes = array();
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/**
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* Class instances.
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*
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* @var array
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*/
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protected $instances = array();
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/**
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* Autoload directories.
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*
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* @var array
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*/
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protected $dirs = array();
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/**
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* Constructor. Enables autoloading.
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*/
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public function __construct() {
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spl_autoload_register(array(__CLASS__, 'autoload'));
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}
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/**
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* Registers a class.
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*
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* @param string $name Registry name
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* @param string $class Class name
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* @param array $params Class initialization parameters
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* @param callback $callback Function to call after object instantiation
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*/
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public function register($name, $class, array $params = array(), $callback = null) {
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unset($this->instances[$class]);
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$this->classes[$name] = array($class, $params, $callback);
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}
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/**
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* Unregisters a class.
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*
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* @param string $name Registry name
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*/
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public function unregister($name) {
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unset($this->classes[$name]);
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}
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/**
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* Loads a registered class.
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*
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* @param string $name Method name
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* @param bool $shared Shared instance
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*/
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public function load($name, $shared = true) {
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if (isset($this->classes[$name])) {
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list($class, $params, $callback) = $this->classes[$name];
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$do_callback = ($callback && (!$shared || !isset($this->instances[$class])));
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$obj = ($shared) ?
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$this->getInstance($class, $params) :
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$this->newInstance($class, $params);
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if ($do_callback) {
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$ref = array(&$obj);
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call_user_func_array($callback, $ref);
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}
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return $obj;
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}
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$class = ucfirst($name);
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return ($shared) ?
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$this->getInstance($class) :
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$this->newInstance($class);
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}
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/**
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* Gets a single instance of a class.
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*
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* @param string $class Class name
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* @param array $params Class initialization parameters
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*/
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public function getInstance($class, array $params = array()) {
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if (!isset($this->instances[$class])) {
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$this->instances[$class] = $this->newInstance($class, $params);
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}
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return $this->instances[$class];
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}
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/**
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* Gets a new instance of a class.
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*
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* @param string $class Class name
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* @param array $params Class initialization parameters
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*/
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public function newInstance($class, array $params = array()) {
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switch (count($params)) {
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case 0:
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return new $class();
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case 1:
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return new $class($params[0]);
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case 2:
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return new $class($params[0], $params[1]);
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case 3:
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return new $class($params[0], $params[1], $params[2]);
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case 4:
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return new $class($params[0], $params[1], $params[2], $params[3]);
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case 5:
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return new $class($params[0], $params[1], $params[2], $params[3], $params[4]);
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default:
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$refClass = new ReflectionClass($class);
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return $refClass->newInstanceArgs($params);
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}
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}
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/**
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* Adds a directory for autoloading classes.
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*
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* @param string $dir Directory path
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*/
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public function addDirectory($dir) {
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$this->dirs[] = $dir;
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}
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/**
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* Autoloads classes.
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*
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* @param string $class Class name
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*/
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public function autoload($class) {
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$class_file = str_replace('\\', '/', str_replace('_', '/', $class)).'.php';
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$dirs = array_merge($this->dirs, array(__DIR__, '.'));
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foreach ($dirs as $dir) {
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$file = $dir.'/'.$class_file;
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if (file_exists($file)) {
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require $file;
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return;
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}
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}
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// Allow other autoloaders to run before raising an error
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$loader = array_pop(spl_autoload_functions());
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if (is_array($loader) && $loader[0] == __CLASS__ && $loader[1] == __FUNCTION__) {
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throw new Exception('Unable to load file: '.$class_file);
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}
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}
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}
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?>
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