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<?php |
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/* |
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* This file is part of the XabbuhPandaBundle package. |
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* |
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* (c) Christian Flothmann <[email protected]> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace Xabbuh\PandaBundle\DependencyInjection; |
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use Symfony\Component\Config\FileLocator; |
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use Symfony\Component\DependencyInjection\Alias; |
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use Symfony\Component\DependencyInjection\ContainerBuilder; |
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use Symfony\Component\DependencyInjection\ChildDefinition; |
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use Symfony\Component\DependencyInjection\Definition; |
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use Symfony\Component\DependencyInjection\DefinitionDecorator; |
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use Symfony\Component\DependencyInjection\Loader\XmlFileLoader; |
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use Symfony\Component\DependencyInjection\Reference; |
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use Symfony\Component\HttpKernel\DependencyInjection\Extension; |
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use Xabbuh\PandaClient\Api\CloudInterface; |
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/** |
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* XabbuhPandaExtension. |
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* |
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* @author Christian Flothmann <[email protected]> |
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*/ |
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class XabbuhPandaExtension extends Extension |
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{ |
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/** |
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* {@inheritDoc} |
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*/ |
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public function load(array $configs, ContainerBuilder $container) |
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{ |
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$configuration = new Configuration(); |
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$config = $this->processConfiguration($configuration, $configs); |
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$container->setParameter( |
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'xabbuh_panda.video_uploader.multiple_files', |
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$config['video_uploader']['multiple_files'] |
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); |
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$container->setParameter( |
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'xabbuh_panda.video_uploader.cancel_button', |
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$config['video_uploader']['cancel_button'] |
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); |
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$container->setParameter( |
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'xabbuh_panda.video_uploader.progress_bar', |
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$config['video_uploader']['progress_bar'] |
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); |
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$container->setParameter('xabbuh_panda.account.default', $config['default_account']); |
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$container->setParameter('xabbuh_panda.cloud.default', $config['default_cloud']); |
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// and load the service definitions |
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$loader = new XmlFileLoader($container, new FileLocator(__DIR__.'/../Resources/config')); |
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$loader->load('account_manager.xml'); |
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$loader->load('cloud_manager.xml'); |
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$loader->load('cloud_factory.xml'); |
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$loader->load('controller.xml'); |
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$loader->load('transformers.xml'); |
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$loader->load('video_uploader_extension.xml'); |
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$knownAccounts = $this->loadAccounts($config['accounts'], $container); |
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$knownClouds = $this->loadClouds($config['clouds'], $container, $knownAccounts, $config['default_account']); |
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if (isset($knownClouds[$config['default_cloud']])) { |
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$container->setAlias(CloudInterface::class, new Alias($knownClouds[$config['default_cloud']], false)); |
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} |
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$baseHttpClientDefinition = $container->getDefinition('xabbuh_panda.http_client'); |
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foreach (array('client' => 0, 'request_factory' => 1, 'stream_factory' => 2) as $key => $argumentIndex) { |
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if (null !== $config['httplug'][$key]) { |
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$baseHttpClientDefinition->replaceArgument($argumentIndex, new Reference($config['httplug'][$key])); |
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} |
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} |
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} |
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private function loadAccounts(array $accounts, ContainerBuilder $container) |
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{ |
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$accountManagerDefinition = $container->getDefinition('xabbuh_panda.account_manager'); |
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$knownAccounts = array(); |
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foreach ($accounts as $name => $accountConfig) { |
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// register each account as a service |
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$accountDefinition = new Definition( |
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'Xabbuh\PandaClient\Api\Account', |
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array( |
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$accountConfig['access_key'], |
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$accountConfig['secret_key'], |
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$accountConfig['api_host'] |
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) |
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); |
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$id = 'xabbuh_panda.'.strtr($name, ' -', '_').'_account'; |
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$container->setDefinition($id, $accountDefinition); |
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// and pass it to the manager's registerAccount() method |
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$accountManagerDefinition->addMethodCall( |
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'registerAccount', |
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array($name, new Reference($id)) |
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); |
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$knownAccounts[$name] = $id; |
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} |
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return $knownAccounts; |
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} |
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private function loadClouds(array $clouds, ContainerBuilder $container, array $knownAccounts, $defaultAccount) |
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{ |
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$cloudManagerDefinition = $container->getDefinition('xabbuh_panda.cloud_manager'); |
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$knownClouds = array(); |
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foreach ($clouds as $name => $cloudConfig) { |
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$accountName = isset($cloudConfig['account']) ? $cloudConfig['account'] : $defaultAccount; |
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if (!isset($knownAccounts[$accountName])) { |
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throw new \InvalidArgumentException(sprintf('The account `%s` configured for the cloud `%s` is not one of the configured accounts.', $accountName, $name)); |
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} |
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if (class_exists('Symfony\Component\DependencyInjection\ChildDefinition')) { |
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$httpClientDefinition = new ChildDefinition('xabbuh_panda.http_client'); |
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} else { |
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$httpClientDefinition = new DefinitionDecorator('xabbuh_panda.http_client'); |
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} |
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$httpClientDefinition->setPublic(false); |
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// Get a reference to the account service directly, to avoid instantiating the AccountManager (and all other |
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// accounts due to the AccountManager not supporting lazy-loading) |
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$httpClientDefinition->addMethodCall('setAccount', array(new Reference($knownAccounts[$accountName]))); |
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$httpClientDefinition->addMethodCall('setCloudId', array($cloudConfig['id'])); |
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$httpClientId = 'xabbuh_panda.http_client.'.strtr($name, ' -', '_'); |
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$container->setDefinition($httpClientId, $httpClientDefinition); |
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// register each cloud as a service |
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$cloudDefinition = new Definition('Xabbuh\PandaClient\Api\Cloud'); |
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$cloudDefinition->addMethodCall('setHttpClient', array(new Reference($httpClientId))); |
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$cloudDefinition->addMethodCall('setTransformers', array(new Reference('xabbuh_panda.transformer'))); |
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$id = 'xabbuh_panda.'.strtr($name, ' -', '_').'_cloud'; |
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$container->setDefinition($id, $cloudDefinition); |
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// and pass it to the manager's registerAccount() method |
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$cloudManagerDefinition->addMethodCall( |
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'registerCloud', |
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array($name, new Reference($id)) |
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); |
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$knownClouds[$name] = $id; |
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} |
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return $knownClouds; |
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} |
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/** |
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* {@inheritDoc} |
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*/ |
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public function getNamespace() |
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{ |
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return 'http://xabbuh.de/schema/dic/xabbuh/panda'; |
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} |
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/** |
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* {@inheritDoc} |
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*/ |
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public function getXsdValidationBasePath() |
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{ |
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return __DIR__.'/../Resources/config/schema'; |
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} |
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} |
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If you return a value from a function or method, it should be a sub-type of the type that is given by the parent type f.e. an interface, or abstract method. This is more formally defined by the Lizkov substitution principle, and guarantees that classes that depend on the parent type can use any instance of a child type interchangably. This principle also belongs to the SOLID principles for object oriented design.
Let’s take a look at an example:
Our function
my_function
expects aPost
object, and outputs the author of the post. The base classPost
returns a simple string and outputting a simple string will work just fine. However, the child classBlogPost
which is a sub-type ofPost
instead decided to return anobject
, and is therefore violating the SOLID principles. If aBlogPost
were passed tomy_function
, PHP would not complain, but ultimately fail when executing thestrtoupper
call in its body.