2010-01-04 14:26:20 +00:00
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<?php
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namespace Symfony\Components\DependencyInjection;
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/*
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2010-04-07 01:51:29 +01:00
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* This file is part of the Symfony framework.
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2010-01-04 14:26:20 +00:00
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*
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* (c) Fabien Potencier <fabien.potencier@symfony-project.com>
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*
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* This source file is subject to the MIT license that is bundled
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* with this source code in the file LICENSE.
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*/
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/**
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* Container is a dependency injection container.
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*
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* It gives access to object instances (services), and parameters.
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*
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* Services and parameters are simple key/pair stores.
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*
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* Parameters keys are case insensitive.
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*
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* A service id can contain lowercased letters, digits, underscores, and dots.
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* Underscores are used to separate words, and dots to group services
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* under namespaces:
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*
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* <ul>
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* <li>request</li>
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* <li>mysql_session_storage</li>
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* <li>symfony.mysql_session_storage</li>
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* </ul>
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*
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* A service can also be defined by creating a method named
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* getXXXService(), where XXX is the camelized version of the id:
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*
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* <ul>
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* <li>request -> getRequestService()</li>
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* <li>mysql_session_storage -> getMysqlSessionStorageService()</li>
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* <li>symfony.mysql_session_storage -> getSymfony_MysqlSessionStorageService()</li>
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* </ul>
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*
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* The container can have three possible behaviors when a service does not exist:
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*
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* * EXCEPTION_ON_INVALID_REFERENCE: Throws an exception (the default)
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* * NULL_ON_INVALID_REFERENCE: Returns null
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* * IGNORE_ON_INVALID_REFERENCE: Ignores the wrapping command asking for the reference
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* (for instance, ignore a setter if the service does not exist)
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*
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2010-04-07 01:51:29 +01:00
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* @package Symfony
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* @subpackage Components_DependencyInjection
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2010-01-04 14:26:20 +00:00
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* @author Fabien Potencier <fabien.potencier@symfony-project.com>
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*/
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2010-02-08 17:39:11 +00:00
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class Container implements ContainerInterface, \ArrayAccess
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2010-01-04 14:26:20 +00:00
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{
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2010-05-06 12:25:53 +01:00
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protected $parameters = array();
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protected $services = array();
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const EXCEPTION_ON_INVALID_REFERENCE = 1;
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const NULL_ON_INVALID_REFERENCE = 2;
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const IGNORE_ON_INVALID_REFERENCE = 3;
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/**
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* Constructor.
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*
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* @param array $parameters An array of parameters
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*/
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public function __construct(array $parameters = array())
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2010-01-04 14:26:20 +00:00
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{
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2010-05-06 12:25:53 +01:00
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$this->setParameters($parameters);
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$this->setService('service_container', $this);
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2010-01-04 14:26:20 +00:00
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}
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2010-05-06 12:25:53 +01:00
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/**
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* Sets the service container parameters.
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*
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* @param array $parameters An array of parameters
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*/
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public function setParameters(array $parameters)
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{
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$this->parameters = array();
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2010-05-07 15:09:11 +01:00
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foreach ($parameters as $key => $value) {
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2010-05-06 12:25:53 +01:00
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$this->parameters[strtolower($key)] = $value;
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}
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}
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/**
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* Adds parameters to the service container parameters.
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*
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* @param array $parameters An array of parameters
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*/
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public function addParameters(array $parameters)
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{
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$this->setParameters(array_merge($this->parameters, $parameters));
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}
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/**
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* Gets the service container parameters.
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*
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* @return array An array of parameters
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*/
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public function getParameters()
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{
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return $this->parameters;
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}
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/**
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* Gets a service container parameter.
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*
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* @param string $name The parameter name
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*
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* @return mixed The parameter value
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*
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* @throws \InvalidArgumentException if the parameter is not defined
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*/
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public function getParameter($name)
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{
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$name = strtolower($name);
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2010-05-07 15:09:11 +01:00
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if (!array_key_exists($name, $this->parameters)) {
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2010-05-06 12:25:53 +01:00
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throw new \InvalidArgumentException(sprintf('The parameter "%s" must be defined.', $name));
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}
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return $this->parameters[$name];
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}
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/**
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* Sets a service container parameter.
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*
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* @param string $name The parameter name
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* @param mixed $parameters The parameter value
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*/
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public function setParameter($name, $value)
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{
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$this->parameters[strtolower($name)] = $value;
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}
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/**
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* Returns true if a parameter name is defined.
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*
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* @param string $name The parameter name
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*
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* @return Boolean true if the parameter name is defined, false otherwise
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*/
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public function hasParameter($name)
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{
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return array_key_exists(strtolower($name), $this->parameters);
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}
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/**
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* Sets a service.
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*
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* @param string $id The service identifier
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* @param object $service The service instance
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*/
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public function setService($id, $service)
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2010-01-04 14:26:20 +00:00
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{
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2010-05-06 12:25:53 +01:00
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$this->services[$id] = $service;
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2010-01-04 14:26:20 +00:00
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}
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2010-05-06 12:25:53 +01:00
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/**
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* Returns true if the given service is defined.
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*
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* @param string $id The service identifier
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*
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* @return Boolean true if the service is defined, false otherwise
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*/
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public function hasService($id)
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2010-01-19 12:29:28 +00:00
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{
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2010-05-06 12:25:53 +01:00
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return isset($this->services[$id]) || method_exists($this, 'get'.strtr($id, array('_' => '', '.' => '_')).'Service');
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2010-01-19 12:29:28 +00:00
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}
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2010-05-06 12:25:53 +01:00
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/**
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* Gets a service.
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*
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* If a service is both defined through a setService() method and
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* with a set*Service() method, the former has always precedence.
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*
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* @param string $id The service identifier
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* @param int $invalidBehavior The behavior when the service does not exist
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*
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* @return object The associated service
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*
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* @throws \InvalidArgumentException if the service is not defined
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*
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* @see Reference
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*/
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public function getService($id, $invalidBehavior = self::EXCEPTION_ON_INVALID_REFERENCE)
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2010-01-04 14:26:20 +00:00
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{
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2010-05-07 15:09:11 +01:00
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if (!is_string($id)) {
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2010-05-06 12:25:53 +01:00
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throw new \InvalidArgumentException(sprintf('A service id should be a string (%s given).', str_replace("\n", '', var_export($id, true))));
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}
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2010-05-07 15:09:11 +01:00
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if (isset($this->services[$id])) {
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2010-05-06 12:25:53 +01:00
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return $this->services[$id];
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}
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2010-05-07 15:09:11 +01:00
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if (method_exists($this, $method = 'get'.strtr($id, array('_' => '', '.' => '_')).'Service') && 'getService' !== $method) {
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2010-05-06 12:25:53 +01:00
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return $this->$method();
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}
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2010-05-07 15:09:11 +01:00
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if (self::EXCEPTION_ON_INVALID_REFERENCE === $invalidBehavior) {
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2010-05-06 12:25:53 +01:00
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throw new \InvalidArgumentException(sprintf('The service "%s" does not exist.', $id));
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2010-05-07 15:09:11 +01:00
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} else {
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2010-05-06 12:25:53 +01:00
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return null;
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}
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2010-01-04 14:26:20 +00:00
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}
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2010-05-06 12:25:53 +01:00
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/**
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* Gets all service ids.
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*
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* @return array An array of all defined service ids
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*/
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public function getServiceIds()
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2010-01-04 14:26:20 +00:00
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{
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2010-05-06 12:25:53 +01:00
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$ids = array();
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$r = new \ReflectionClass($this);
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2010-05-07 15:09:11 +01:00
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foreach ($r->getMethods() as $method) {
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2010-05-08 14:32:30 +01:00
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if (preg_match('/^get(.+)Service$/', $name = $method->getName(), $match)) {
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2010-05-06 12:25:53 +01:00
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$ids[] = self::underscore($match[1]);
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}
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}
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return array_merge($ids, array_keys($this->services));
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2010-01-04 14:26:20 +00:00
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}
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2010-05-06 12:25:53 +01:00
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/**
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* Returns true if the parameter name is defined (implements the ArrayAccess interface).
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*
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* @param string The parameter name
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*
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* @return Boolean true if the parameter name is defined, false otherwise
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*/
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public function offsetExists($name)
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{
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2010-05-06 12:25:53 +01:00
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return $this->hasParameter($name);
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2010-01-04 14:26:20 +00:00
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}
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2010-05-06 12:25:53 +01:00
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/**
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* Gets a service container parameter (implements the ArrayAccess interface).
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*
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* @param string The parameter name
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*
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* @return mixed The parameter value
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*/
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public function offsetGet($name)
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2010-01-04 14:26:20 +00:00
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{
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2010-05-06 12:25:53 +01:00
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return $this->getParameter($name);
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2010-01-04 14:26:20 +00:00
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}
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2010-05-06 12:25:53 +01:00
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/**
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* Sets a parameter (implements the ArrayAccess interface).
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*
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* @param string The parameter name
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* @param mixed The parameter value
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*/
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public function offsetSet($name, $value)
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2010-01-04 14:26:20 +00:00
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{
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2010-05-06 12:25:53 +01:00
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$this->setParameter($name, $value);
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2010-01-04 14:26:20 +00:00
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}
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2010-05-06 12:25:53 +01:00
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/**
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* Removes a parameter (implements the ArrayAccess interface).
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*
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* @param string The parameter name
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*/
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public function offsetUnset($name)
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2010-01-27 10:10:45 +00:00
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{
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2010-05-06 12:25:53 +01:00
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unset($this->parameters[$name]);
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2010-01-27 10:10:45 +00:00
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}
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2010-05-06 12:25:53 +01:00
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/**
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* Returns true if the container has a service with the given identifier.
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*
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* @param string The service identifier
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*
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* @return Boolean true if the container has a service with the given identifier, false otherwise
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*/
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public function __isset($id)
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{
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return $this->hasService($id);
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}
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2010-01-27 10:10:45 +00:00
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2010-05-06 12:25:53 +01:00
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/**
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* Gets the service associated with the given identifier.
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*
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* @param string The service identifier
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*
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* @return mixed The service instance associated with the given identifier
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*/
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public function __get($id)
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{
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return $this->getService($id);
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}
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2010-01-04 14:26:20 +00:00
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2010-05-06 12:25:53 +01:00
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/**
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* Sets a service.
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*
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* @param string The service identifier
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* @param mixed A service instance
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*/
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public function __set($id, $service)
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{
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$this->setService($id, $service);
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}
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/**
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* Removes a service by identifier.
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*
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* @param string The service identifier
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*
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* @throws LogicException When trying to unset a service
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*/
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public function __unset($id)
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{
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throw new \LogicException('You can\'t unset a service.');
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}
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/**
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* Catches unknown methods.
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*
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* @param string $method The called method name
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* @param array $arguments The method arguments
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*
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* @return mixed
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*
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* @throws \BadMethodCallException When calling to an undefined method
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*/
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public function __call($method, $arguments)
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{
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2010-05-07 15:09:11 +01:00
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if (!preg_match('/^get(.+)Service$/', $method, $match)) {
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2010-05-06 12:25:53 +01:00
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throw new \BadMethodCallException(sprintf('Call to undefined method %s::%s.', get_class($this), $method));
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}
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return $this->getService(self::underscore($match[1]));
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}
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static public function camelize($id)
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{
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return preg_replace(array('/(^|_)+(.)/e', '/\.(.)/e'), array("strtoupper('\\2')", "'_'.strtoupper('\\1')"), $id);
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}
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static public function underscore($id)
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{
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return strtolower(preg_replace(array('/([A-Z]+)([A-Z][a-z])/', '/([a-z\d])([A-Z])/'), array('\\1_\\2', '\\1_\\2'), strtr($id, '_', '.')));
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}
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2010-01-04 14:26:20 +00:00
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}
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