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<?php
/**
* @copyright Copyright (c) 2016, ownCloud, Inc.
*
* @author Bernhard Posselt <dev@bernhard-posselt.com>
* @author Joas Schilling <coding@schilljs.com>
* @author Lukas Reschke <lukas@statuscode.ch>
* @author Morris Jobke <hey@morrisjobke.de>
* @author Robin McCorkell <robin@mccorkell.me.uk>
* @author Roeland Jago Douma <roeland@famdouma.nl>
* @author Thomas Müller <thomas.mueller@tmit.eu>
*
* @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 ReflectionClass;
use ReflectionException;
use Closure;
use Pimple\Container;
use OCP\AppFramework\QueryException;
use OCP\IContainer;
/**
* Class SimpleContainer
*
* SimpleContainer is a simple implementation of IContainer on basis of Pimple
*/
class SimpleContainer extends Container implements 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;
}
try {
$parameters[] = $this->query($resolveName);
} catch (\Exception $e) {
// Service not found, use the default value when available
if ($parameter->isDefaultValueAvailable()) {
$parameters[] = $parameter->getDefaultValue();
} else if ($parameterClass !== null) {
$resolveName = $parameter->getName();
$parameters[] = $this->query($resolveName);
} else {
throw $e;
}
}
}
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 $name the class name to resolve
* @return \stdClass
* @throws QueryException if the class could not be found or instantiated
*/
public function resolve($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 $name
* @throws QueryException if the query could not be resolved
*/
public function query($name) {
$name = $this->sanitizeName($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 $value
*/
public function registerParameter($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 $shared
*/
public function registerService($name, Closure $closure, $shared = true) {
$name = $this->sanitizeName($name);
if (isset($this[$name])) {
unset($this[$name]);
}
if ($shared) {
$this[$name] = $closure;
} else {
$this[$name] = parent::factory($closure);
}
}
/**
* Shortcut for returning a service from a service under a different key,
* e.g. to tell the container to return a class when queried for an
* interface
* @param string $alias the alias that should be registered
* @param string $target the target that should be resolved instead
*/
public function registerAlias($alias, $target) {
$this->registerService($alias, function (IContainer $container) use ($target) {
return $container->query($target);
}, false);
}
/*
* @param string $name
* @return string
*/
protected function sanitizeName($name) {
if (isset($name[0]) && $name[0] === '\\') {
return ltrim($name, '\\');
}
return $name;
}
}