1:   2:   3:   4:   5:   6:   7:   8:   9:  10:  11:  12:  13:  14:  15:  16:  17:  18:  19:  20:  21:  22:  23:  24:  25:  26:  27:  28:  29:  30:  31:  32:  33:  34:  35:  36:  37:  38:  39:  40:  41:  42:  43:  44:  45:  46:  47:  48:  49:  50:  51:  52:  53:  54:  55:  56:  57:  58:  59:  60:  61:  62:  63:  64:  65:  66:  67:  68:  69:  70:  71:  72:  73:  74:  75:  76:  77:  78:  79:  80:  81:  82:  83:  84:  85:  86:  87:  88:  89:  90:  91:  92:  93:  94:  95:  96:  97:  98:  99: 100: 101: 102: 103: 104: 105: 

<?php

/**
 * This file is part of the Lean Mapper library (http://www.leanmapper.com)
 *
 * Copyright (c) 2013 Vojtěch Kohout (aka Tharos)
 *
 * For the full copyright and license information, please view the file
 * license-mit.txt that was distributed with this source code.
 */

namespace LeanMapper;

use LeanMapper\Exception\InvalidArgumentException;

/**
 * @author Vojtěch Kohout
 */
class Events
{

    const EVENT_BEFORE_PERSIST = 'beforePersist';

    const EVENT_BEFORE_CREATE = 'beforeCreate';

    const EVENT_BEFORE_UPDATE = 'beforeUpdate';

    const EVENT_BEFORE_DELETE = 'beforeDelete';

    const EVENT_AFTER_PERSIST = 'afterPersist';

    const EVENT_AFTER_CREATE = 'afterCreate';

    const EVENT_AFTER_UPDATE = 'afterUpdate';

    const EVENT_AFTER_DELETE = 'afterDelete';

    /** @var array */
    private $events = array(
        self::EVENT_BEFORE_PERSIST => array(),
        self::EVENT_BEFORE_CREATE => array(),
        self::EVENT_BEFORE_UPDATE => array(),
        self::EVENT_BEFORE_DELETE => array(),
        self::EVENT_AFTER_PERSIST => array(),
        self::EVENT_AFTER_CREATE => array(),
        self::EVENT_AFTER_UPDATE => array(),
        self::EVENT_AFTER_DELETE => array(),
    );


    /**
     * Registers new callback for given event
     *
     * @param string $event
     * @param mixed $callback
     */
    public function registerCallback($event, $callback)
    {
        $this->checkEventType($event);
        $this->events[$event][] = $callback;
    }

    /**
     * Invokes callbacks registered for given event
     *
     * @param string $event
     * @param mixed $arg
     * @throws InvalidArgumentException
     */
    public function invokeCallbacks($event, $arg)
    {
        $this->checkEventType($event);
        foreach ($this->events[$event] as $callback) {
            call_user_func($callback, $arg);
        }
    }

    /**
     * Gets reference to array of registered events
     *
     * @param string $event
     * @return array
     */
    public function &getCallbacksReference($event)
    {
        $this->checkEventType($event);
        return $this->events[$event];
    }

    //////////////////////
    //////////////////////

    /**
     * @param string $event
     * @throws InvalidArgumentException
     */
    private function checkEventType($event)
    {
        if (!isset($this->events[$event])) {
            throw new InvalidArgumentException("Unknown event type given: '$event'.");
        }
    }

}