<?php

namespace Symfony\Component\HttpKernel\DependencyInjection;

use Symfony\Component\Config\Definition\Processor;

use Symfony\Component\Config\Definition\ConfigurationInterface;

use Symfony\Component\DependencyInjection\Extension\ExtensionInterface;

use Symfony\Component\DependencyInjection\ContainerBuilder;

use Symfony\Component\DependencyInjection\Container;

/*

 * This file is part of the Symfony framework.

 *

 * (c) Fabien Potencier <fabien@symfony.com>

 *

 * This source file is subject to the MIT license that is bundled

 * with this source code in the file LICENSE.

 */

/**

 * Provides useful features shared by many extensions.

 *

 * @author Fabien Potencier <fabien@symfony.com>

 */

abstract class Extension implements ExtensionInterface

{

    private $classes = array();

    /**

     * Gets the classes to cache.

     *

     * @return array An array of classes

     */

    public function getClassesToCompile()

    {

        return $this->classes;

    }

    /**

     * Adds classes to the class cache.

     *

     * @param array $classes An array of classes

     */

    public function addClassesToCompile(array $classes)

    {

        $this->classes = array_merge($this->classes, $classes);

    }

    /**

     * 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

     */

    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);

    }

    protected final function processConfiguration(ConfigurationInterface $configuration, array $configs)

    {

        $processor = new Processor();

        return $processor->processConfiguration($configuration, $configs);

    }

}