AstroFields/Core

<?php

namespace WCM\AstroFields\Core\Commands;

use WCM\AstroFields\Core\Mediators\EntityInterface;

/**
 * Class AbstractCollectorCommand
 * @package WCM\AstroFields\Core\Commands
 */
abstract class AbstractCollectorCommand extends \SplPriorityQueue implements CommandInterface
{
    /**
     * @param EntityInterface $entity
     * @param int             $priority
     * @return mixed
     */
    abstract public function attach( EntityInterface $entity, $priority );

    /**
     * @param int $a
     * @param int $b
     * @return int
     */
    public function compare( $a, $b )
    {
        if ( $a === $b )
            return 0;

        return $a < $b ? -1 : 1;
    }
}