Sindbad~EG File Manager

<?php

namespace PrestoPlayer;

class Core
{
    /**
     * The singleton instance.
     *
     * @var Core
     */
    private static $instance;

    /**
     * Retrieves (and if necessary creates) the API instance. Should not be called outside of plugin set-up.
     *
     * @internal
     *
     * @since 1.0.0
     *
     * @param  Core $instance Only used for plugin initialization. Don't ever pass a value in user code.
     *
     * @return void
     *
     * @throws \BadMethodCallException Thrown when Avatar_Privacy_Core::set_instance after plugin initialization.
     */
    public static function set_instance(Core $instance)
    {
        if (null === self::$instance) {
            self::$instance = $instance;
        } else {
            // throw new \BadMethodCallException(__METHOD__ . ' called more than once.');
        }
    }


    /**
     * Retrieves the plugin instance.
     *
     * @since 1.0.0
     *
     * @throws \BadMethodCallException Thrown when Avatar_Privacy_Core::get_instance is called before plugin initialization.
     *
     * @return Core
     */
    public static function get_instance()
    {
        if (null === self::$instance) {
            throw new \BadMethodCallException(__METHOD__ . ' called without prior plugin intialization.');
        }

        return self::$instance;
    }
}