appwrite/src/Storage/Storage.php

<?php

namespace Storage;

use Exception;

class Storage
{
    /**
     * Devices
     *
     * List of all available storage devices
     *
     * @var array
     */
    static  $devices = array();

    /**
     * Add Device
     *
     * Add device by name
     *
     * @param string $name
     * @param Device $device
     * @throws Exception
     */
    static public function addDevice($name, Device $device)
    {
        if(array_key_exists($name, self::$devices)) {
            throw new Exception('The device "' . $name . '" is already listed');
        }

        self::$devices[$name] = $device;
    }

    /**
     * Get Device
     *
     * Get device by name
     *
     * @param string $name
     * @return Device
     * @throws Exception
     */
    static public function getDevice($name)
    {
        if(!array_key_exists($name, self::$devices)) {
            throw new Exception('The device "' . $name . '" is not listed');
        }

        return self::$devices[$name];
    }

    /**
     * Exists
     *
     * Checks if given storage name is registered or not
     *
     * @param string $name
     * @return bool
     */
    static public function exists($name)
    {
        return (bool)array_key_exists($name, self::$devices);
    }
}