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<?php
/**
* @author Robin McCorkell <rmccorkell@owncloud.com>
*
* @copyright Copyright (c) 2015, ownCloud, Inc.
* @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 OCA\Files_External\Lib;
use \OCA\Files_External\Lib\MissingDependency;
/**
* Trait for objects that have dependencies for use
*/
trait DependencyTrait {
/** @var callable|null dependency check */
private $dependencyCheck = null;
/**
* @return bool
*/
public function hasDependencies() {
return !is_null($this->dependencyCheck);
}
/**
* @param callable $dependencyCheck
* @return self
*/
public function setDependencyCheck(callable $dependencyCheck) {
$this->dependencyCheck = $dependencyCheck;
return $this;
}
/**
* Check if object is valid for use
*
* @return MissingDependency[] Unsatisfied dependencies
*/
public function checkDependencies() {
$ret = [];
if ($this->hasDependencies()) {
$result = call_user_func($this->dependencyCheck);
if ($result !== true) {
if (!is_array($result)) {
$result = [$result];
}
foreach ($result as $key => $value) {
if (!($value instanceof MissingDependency)) {
$module = null;
$message = null;
if (is_numeric($key)) {
$module = $value;
} else {
$module = $key;
$message = $value;
}
$value = new MissingDependency($module, $this);
$value->setMessage($message);
}
$ret[] = $value;
}
}
}
return $ret;
}
}
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