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<?php
/**
 * Handles adding and dispatching events
 *
 * @package Requests
 * @subpackage Utilities
 */

/**
 * Handles adding and dispatching events
 *
 * @package Requests
 * @subpackage Utilities
 */
class Requests_Hooks implements Requests_Hooker {
    /**
     * Registered callbacks for each hook
     *
     * @var array
     */
    protected $hooks = array();

    /**
     * Constructor
     */
    public function __construct() {
        // pass
    }

    /**
     * Register a callback for a hook
     *
     * @param string $hook Hook name
     * @param callback $callback Function/method to call on event
     * @param int $priority Priority number. <0 is executed earlier, >0 is executed later
     */
    public function register($hook, $callback, $priority = 0) {
        if (!isset($this->hooks[$hook])) {
            $this->hooks[$hook] = array();
        }
        if (!isset($this->hooks[$hook][$priority])) {
            $this->hooks[$hook][$priority] = array();
        }

        $this->hooks[$hook][$priority][] = $callback;
    }

    /**
     * Dispatch a message
     *
     * @param string $hook Hook name
     * @param array $parameters Parameters to pass to callbacks
     * @return boolean Successfulness
     */
    public function dispatch($hook, $parameters = array()) {
        if (empty($this->hooks[$hook])) {
            return false;
        }

        foreach ($this->hooks[$hook] as $priority => $hooked) {
            foreach ($hooked as $callback) {
                call_user_func_array($callback, $parameters);
            }
        }

        return true;
    }
}