owncloud/core

<?php
/**
 * @author Roeland Jago Douma <rullzer@owncloud.com>
 * @author Thomas Müller <thomas.mueller@tmit.eu>
 *
 * @copyright Copyright (c) 2018, ownCloud GmbH
 * @license AGPL-3.0
 *
 * This code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License, version 3,
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License, version 3,
 * along with this program.  If not, see <http://www.gnu.org/licenses/>
 *
 */
namespace OC;

use OCP\Capabilities\ICapability;

class CapabilitiesManager {
    /**
     * @var \Closure[]
     */
    private $capabilities = [];

    /**
     * Get an array of al the capabilities that are registered at this manager
     *
     * @throws \InvalidArgumentException
     * @return array
     */
    public function getCapabilities() {
        $capabilities = [];
        foreach ($this->capabilities as $capability) {
            $c = $capability();
            if ($c instanceof ICapability) {
                $capabilities = \array_replace_recursive($capabilities, $c->getCapabilities());
            } else {
                throw new \InvalidArgumentException('The given Capability (' . \get_class($c) . ') does not implement the ICapability interface');
            }
        }

        return $capabilities;
    }

    /**
     * In order to improve lazy loading a closure can be registered which will be called in case
     * capabilities are actually requested
     *
     * $callable has to return an instance of OCP\Capabilities\ICapability
     *
     * @param \Closure $callable
     */
    public function registerCapability(\Closure $callable) {
        \array_push($this->capabilities, $callable);
    }
}