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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\DependencyInjection\Extension;
use Symfony\Component\DependencyInjection\Container;
use Symfony\Component\DependencyInjection\Exception\BadMethodCallException;
use Symfony\Component\DependencyInjection\Exception\InvalidArgumentException;
use Symfony\Component\Config\Resource\FileResource;
use Symfony\Component\DependencyInjection\ContainerBuilder;
use Symfony\Component\Config\Definition\Processor;
use Symfony\Component\Config\Definition\ConfigurationInterface;
/**
* Provides useful features shared by many extensions.
*
* @author Fabien Potencier <fabien@symfony.com>
*/
abstract class Extension implements ExtensionInterface, ConfigurationExtensionInterface
{
/**
* Returns the base path for the XSD files.
*
* @return string The XSD base path
*/
public function getXsdValidationBasePath()
{
return false;
}
/**
* Returns the namespace to be used for this extension (XML namespace).
*
* @return string The XML namespace
*/
public function getNamespace()
{
return 'http://example.org/schema/dic/'.$this->getAlias();
}
/**
* Returns the recommended alias to use in XML.
*
* This alias is also the mandatory prefix to use when using YAML.
*
* This convention is to remove the "Extension" postfix from the class
* name and then lowercase and underscore the result. So:
*
* AcmeHelloExtension
*
* becomes
*
* acme_hello
*
* This can be overridden in a sub-class to specify the alias manually.
*
* @return string The alias
*
* @throws BadMethodCallException When the extension name does not follow conventions
*/
public function getAlias()
{
$className = get_class($this);
if (substr($className, -9) != 'Extension') {
throw new BadMethodCallException('This extension does not follow the naming convention; you must overwrite the getAlias() method.');
}
$classBaseName = substr(strrchr($className, '\\'), 1, -9);
return Container::underscore($classBaseName);
}
/**
* {@inheritDoc}
*/
public function getConfiguration(array $config, ContainerBuilder $container)
{
$reflected = new \ReflectionClass($this);
$namespace = $reflected->getNamespaceName();
$class = $namespace.'\\Configuration';
if (class_exists($class)) {
$r = new \ReflectionClass($class);
$container->addResource(new FileResource($r->getFileName()));
if (!method_exists($class, '__construct')) {
$configuration = new $class();
return $configuration;
}
}
return null;
}
final protected function processConfiguration(ConfigurationInterface $configuration, array $configs)
{
$processor = new Processor();
return $processor->processConfiguration($configuration, $configs);
}
/**
* @param ContainerBuilder $container
* @param array $config
*
* @return Boolean Whether the configuration is enabled
*
* @throws InvalidArgumentException When the config is not enableable
*/
protected function isConfigEnabled(ContainerBuilder $container, array $config)
{
if (!array_key_exists('enabled', $config)) {
throw new InvalidArgumentException("The config array has no 'enabled' key.");
}
return (Boolean) $container->getParameterBag()->resolveValue($config['enabled']);
}
}
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