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<?php declare(strict_types = 1);
/**
 * Copyright (c) 2017 Holger Woltersdorf & Contributors
 * 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.
 */
namespace IceHawk\IceHawk\PubSub;
use IceHawk\IceHawk\PubSub\Interfaces\CarriesEventData;
use IceHawk\IceHawk\PubSub\Interfaces\PublishesEvents;
use IceHawk\IceHawk\PubSub\Interfaces\RegistersEventSubscribers;
use IceHawk\IceHawk\PubSub\Interfaces\SubscribesToEvents;
/**
 * Class EventPublisher
 * @package IceHawk\IceHawk\PubSub
 */
final class EventPublisher implements RegistersEventSubscribers, PublishesEvents
{
    /** @var array|SubscribesToEvents[] */
    private $subscribers;
    public function __construct()
    {
        $this->subscribers = [];
    }
    public function register( SubscribesToEvents $subscriber )
    {
        if ( !in_array( $subscriber, $this->subscribers, false ) )
        {
            $this->subscribers[] = $subscriber;
        }
    }
    public function publish( CarriesEventData $event )
    {
        foreach ( $this->subscribers as $subscriber )
        {
            if ( $subscriber->acceptsEvent( $event ) )
            {
                $subscriber->notify( $event );
            }
        }
    }
}