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<?php
/**
* @author Bernhard Posselt <dev@bernhard-posselt.com>
* @author Jörn Friedrich Dreyer <jfd@butonic.de>
* @author Lukas Reschke <lukas@owncloud.com>
* @author Thomas Müller <thomas.mueller@tmit.eu>
*
* @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 OC\AppFramework\Utility;
use \OCP\AppFramework\QueryException;
/**
* Class SimpleContainer
*
* SimpleContainer is a simple implementation of IContainer on basis of \Pimple
*/
class SimpleContainer extends \Pimple\Container implements \OCP\IContainer {
/**
* @param ReflectionClass $class the class to instantiate
* @return stdClass the created class
*/
private function buildClass(\ReflectionClass $class) {
$constructor = $class->getConstructor();
if ($constructor === null) {
return $class->newInstance();
} else {
$parameters = [];
foreach ($constructor->getParameters() as $parameter) {
$parameterClass = $parameter->getClass();
// try to find out if it is a class or a simple parameter
if ($parameterClass === null) {
$resolveName = $parameter->getName();
} else {
$resolveName = $parameterClass->name;
}
$parameters[] = $this->query($resolveName);
}
return $class->newInstanceArgs($parameters);
}
}
/**
* If a parameter is not registered in the container try to instantiate it
* by using reflection to find out how to build the class
* @param string $name the class name to resolve
* @throws QueryException if the class could not be found or instantiated
*/
private function resolve($name) {
$baseMsg = 'Could not resolve ' . $name . '!';
try {
$class = new \ReflectionClass($name);
if ($class->isInstantiable()) {
return $this->buildClass($class);
} else {
throw new QueryException($baseMsg .
' Class can not be instantiated');
}
} catch(\ReflectionException $e) {
throw new QueryException($baseMsg . ' ' . $e->getMessage());
}
}
/**
* @param string $name name of the service to query for
* @return mixed registered service for the given $name
* @throws QueryExcpetion if the query could not be resolved
*/
public function query($name) {
if ($this->offsetExists($name)) {
return $this->offsetGet($name);
} else {
$object = $this->resolve($name);
$this->registerService($name, function () use ($object) {
return $object;
});
return $object;
}
}
/**
* @param string $name
* @param mixed $value
*/
function registerParameter($name, $value) {
$this[$name] = $value;
}
/**
* The given closure is call the first time the given service is queried.
* The closure has to return the instance for the given service.
* Created instance will be cached in case $shared is true.
*
* @param string $name name of the service to register another backend for
* @param \Closure $closure the closure to be called on service creation
* @param bool $shared
*/
function registerService($name, \Closure $closure, $shared = true) {
if (isset($this[$name])) {
unset($this[$name]);
}
if ($shared) {
$this[$name] = $closure;
} else {
$this[$name] = parent::factory($closure);
}
}
}
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