1 files changed, 162 insertions, 0 deletions
diff --git a/lib/private/AppFramework/Utility/SimpleContainer.php b/lib/private/AppFramework/Utility/SimpleContainer.php
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+++ b/lib/private/AppFramework/Utility/SimpleContainer.php
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+<?php
+/**
+ * @author Bernhard Posselt <dev@bernhard-posselt.com>
+ * @author Joas Schilling <nickvergessen@owncloud.com>
+ * @author Lukas Reschke <lukas@owncloud.com>
+ * @author Morris Jobke <hey@morrisjobke.de>
+ * @author Robin McCorkell <robin@mccorkell.me.uk>
+ * @author Thomas Müller <thomas.mueller@tmit.eu>
+ *
+ * @copyright Copyright (c) 2016, 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 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;
+				}
+
+				$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 $name the class name to resolve
+	 * @return \stdClass
+	 * @throws QueryException if the class could not be found or instantiated
+	 */
+	public function resolve($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) {
+		return ltrim($name, '\\');
+	}
+
+}