ContainerBuilder.php in Service Container 7

Namespace

Symfony\Component\DependencyInjection

File

modules/providers/service_container_symfony/lib/Symfony/Component/DependencyInjection/ContainerBuilder.php

<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <[e-mail]>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
namespace Symfony\Component\DependencyInjection;

use Symfony\Component\DependencyInjection\Compiler\Compiler;
use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
use Symfony\Component\DependencyInjection\Compiler\PassConfig;
use Symfony\Component\DependencyInjection\Exception\BadMethodCallException;
use Symfony\Component\DependencyInjection\Exception\InactiveScopeException;
use Symfony\Component\DependencyInjection\Exception\InvalidArgumentException;
use Symfony\Component\DependencyInjection\Exception\LogicException;
use Symfony\Component\DependencyInjection\Exception\RuntimeException;
use Symfony\Component\DependencyInjection\Extension\ExtensionInterface;
use Symfony\Component\Config\Resource\FileResource;
use Symfony\Component\Config\Resource\ResourceInterface;
use Symfony\Component\DependencyInjection\LazyProxy\Instantiator\InstantiatorInterface;
use Symfony\Component\DependencyInjection\LazyProxy\Instantiator\RealServiceInstantiator;
use Symfony\Component\ExpressionLanguage\Expression;
use Symfony\Component\ExpressionLanguage\ExpressionFunctionProviderInterface;

/**
 * ContainerBuilder is a DI container that provides an API to easily describe services.
 *
 * @author Fabien Potencier <[e-mail]>
 *
 * @api
 */
class ContainerBuilder extends Container implements TaggedContainerInterface {

  /**
   * @var ExtensionInterface[]
   */
  private $extensions = array();

  /**
   * @var ExtensionInterface[]
   */
  private $extensionsByNs = array();

  /**
   * @var Definition[]
   */
  private $definitions = array();

  /**
   * @var Definition[]
   */
  private $obsoleteDefinitions = array();

  /**
   * @var Alias[]
   */
  private $aliasDefinitions = array();

  /**
   * @var ResourceInterface[]
   */
  private $resources = array();
  private $extensionConfigs = array();

  /**
   * @var Compiler
   */
  private $compiler;
  private $trackResources = true;

  /**
   * @var InstantiatorInterface|null
   */
  private $proxyInstantiator;

  /**
   * @var ExpressionLanguage|null
   */
  private $expressionLanguage;

  /**
   * @var ExpressionFunctionProviderInterface[]
   */
  private $expressionLanguageProviders = array();

  /**
   * Sets the track resources flag.
   *
   * If you are not using the loaders and therefore don't want
   * to depend on the Config component, set this flag to false.
   *
   * @param bool $track true if you want to track resources, false otherwise
   */
  public function setResourceTracking($track) {
    $this->trackResources = (bool) $track;
  }

  /**
   * Checks if resources are tracked.
   *
   * @return bool true if resources are tracked, false otherwise
   */
  public function isTrackingResources() {
    return $this->trackResources;
  }

  /**
   * Sets the instantiator to be used when fetching proxies.
   *
   * @param InstantiatorInterface $proxyInstantiator
   */
  public function setProxyInstantiator(InstantiatorInterface $proxyInstantiator) {
    $this->proxyInstantiator = $proxyInstantiator;
  }

  /**
   * Registers an extension.
   *
   * @param ExtensionInterface $extension An extension instance
   *
   * @api
   */
  public function registerExtension(ExtensionInterface $extension) {
    $this->extensions[$extension
      ->getAlias()] = $extension;
    if (false !== $extension
      ->getNamespace()) {
      $this->extensionsByNs[$extension
        ->getNamespace()] = $extension;
    }
  }

  /**
   * Returns an extension by alias or namespace.
   *
   * @param string $name An alias or a namespace
   *
   * @return ExtensionInterface An extension instance
   *
   * @throws LogicException if the extension is not registered
   *
   * @api
   */
  public function getExtension($name) {
    if (isset($this->extensions[$name])) {
      return $this->extensions[$name];
    }
    if (isset($this->extensionsByNs[$name])) {
      return $this->extensionsByNs[$name];
    }
    throw new LogicException(sprintf('Container extension "%s" is not registered', $name));
  }

  /**
   * Returns all registered extensions.
   *
   * @return ExtensionInterface[] An array of ExtensionInterface
   *
   * @api
   */
  public function getExtensions() {
    return $this->extensions;
  }

  /**
   * Checks if we have an extension.
   *
   * @param string $name The name of the extension
   *
   * @return bool If the extension exists
   *
   * @api
   */
  public function hasExtension($name) {
    return isset($this->extensions[$name]) || isset($this->extensionsByNs[$name]);
  }

  /**
   * Returns an array of resources loaded to build this configuration.
   *
   * @return ResourceInterface[] An array of resources
   *
   * @api
   */
  public function getResources() {
    return array_unique($this->resources);
  }

  /**
   * Adds a resource for this configuration.
   *
   * @param ResourceInterface $resource A resource instance
   *
   * @return ContainerBuilder The current instance
   *
   * @api
   */
  public function addResource(ResourceInterface $resource) {
    if (!$this->trackResources) {
      return $this;
    }
    $this->resources[] = $resource;
    return $this;
  }

  /**
   * Sets the resources for this configuration.
   *
   * @param ResourceInterface[] $resources An array of resources
   *
   * @return ContainerBuilder The current instance
   *
   * @api
   */
  public function setResources(array $resources) {
    if (!$this->trackResources) {
      return $this;
    }
    $this->resources = $resources;
    return $this;
  }

  /**
   * Adds the object class hierarchy as resources.
   *
   * @param object $object An object instance
   *
   * @return ContainerBuilder The current instance
   *
   * @api
   */
  public function addObjectResource($object) {
    if ($this->trackResources) {
      $this
        ->addClassResource(new \ReflectionClass($object));
    }
    return $this;
  }

  /**
   * Adds the given class hierarchy as resources.
   *
   * @param \ReflectionClass $class
   *
   * @return ContainerBuilder The current instance
   */
  public function addClassResource(\ReflectionClass $class) {
    if (!$this->trackResources) {
      return $this;
    }
    do {
      $this
        ->addResource(new FileResource($class
        ->getFileName()));
    } while ($class = $class
      ->getParentClass());
    return $this;
  }

  /**
   * Loads the configuration for an extension.
   *
   * @param string $extension The extension alias or namespace
   * @param array  $values    An array of values that customizes the extension
   *
   * @return ContainerBuilder The current instance
   *
   * @throws BadMethodCallException When this ContainerBuilder is frozen
   * @throws \LogicException        if the container is frozen
   *
   * @api
   */
  public function loadFromExtension($extension, array $values = array()) {
    if ($this
      ->isFrozen()) {
      throw new BadMethodCallException('Cannot load from an extension on a frozen container.');
    }
    $namespace = $this
      ->getExtension($extension)
      ->getAlias();
    $this->extensionConfigs[$namespace][] = $values;
    return $this;
  }

  /**
   * Adds a compiler pass.
   *
   * @param CompilerPassInterface $pass A compiler pass
   * @param string                $type The type of compiler pass
   *
   * @return ContainerBuilder The current instance
   *
   * @api
   */
  public function addCompilerPass(CompilerPassInterface $pass, $type = PassConfig::TYPE_BEFORE_OPTIMIZATION) {
    $this
      ->getCompiler()
      ->addPass($pass, $type);
    $this
      ->addObjectResource($pass);
    return $this;
  }

  /**
   * Returns the compiler pass config which can then be modified.
   *
   * @return PassConfig The compiler pass config
   *
   * @api
   */
  public function getCompilerPassConfig() {
    return $this
      ->getCompiler()
      ->getPassConfig();
  }

  /**
   * Returns the compiler.
   *
   * @return Compiler The compiler
   *
   * @api
   */
  public function getCompiler() {
    if (null === $this->compiler) {
      $this->compiler = new Compiler();
    }
    return $this->compiler;
  }

  /**
   * Returns all Scopes.
   *
   * @return array An array of scopes
   *
   * @api
   */
  public function getScopes() {
    return $this->scopes;
  }

  /**
   * Returns all Scope children.
   *
   * @return array An array of scope children.
   *
   * @api
   */
  public function getScopeChildren() {
    return $this->scopeChildren;
  }

  /**
   * Sets a service.
   *
   * @param string $id      The service identifier
   * @param object $service The service instance
   * @param string $scope   The scope
   *
   * @throws BadMethodCallException When this ContainerBuilder is frozen
   *
   * @api
   */
  public function set($id, $service, $scope = self::SCOPE_CONTAINER) {
    $id = strtolower($id);
    if ($this
      ->isFrozen()) {

      // setting a synthetic service on a frozen container is alright
      if (!isset($this->definitions[$id]) && !isset($this->obsoleteDefinitions[$id]) || isset($this->definitions[$id]) && !$this->definitions[$id]
        ->isSynthetic() || isset($this->obsoleteDefinitions[$id]) && !$this->obsoleteDefinitions[$id]
        ->isSynthetic()) {
        throw new BadMethodCallException(sprintf('Setting service "%s" on a frozen container is not allowed.', $id));
      }
    }
    if (isset($this->definitions[$id])) {
      $this->obsoleteDefinitions[$id] = $this->definitions[$id];
    }
    unset($this->definitions[$id], $this->aliasDefinitions[$id]);
    parent::set($id, $service, $scope);
    if (isset($this->obsoleteDefinitions[$id]) && $this->obsoleteDefinitions[$id]
      ->isSynchronized(false)) {
      $this
        ->synchronize($id);
    }
  }

  /**
   * Removes a service definition.
   *
   * @param string $id The service identifier
   *
   * @api
   */
  public function removeDefinition($id) {
    unset($this->definitions[strtolower($id)]);
  }

  /**
   * Returns true if the given service is defined.
   *
   * @param string $id The service identifier
   *
   * @return bool true if the service is defined, false otherwise
   *
   * @api
   */
  public function has($id) {
    $id = strtolower($id);
    return isset($this->definitions[$id]) || isset($this->aliasDefinitions[$id]) || parent::has($id);
  }

  /**
   * Gets a service.
   *
   * @param string $id              The service identifier
   * @param int    $invalidBehavior The behavior when the service does not exist
   *
   * @return object The associated service
   *
   * @throws InvalidArgumentException when no definitions are available
   * @throws InactiveScopeException   when the current scope is not active
   * @throws LogicException           when a circular dependency is detected
   * @throws \Exception
   *
   * @see Reference
   *
   * @api
   */
  public function get($id, $invalidBehavior = ContainerInterface::EXCEPTION_ON_INVALID_REFERENCE) {
    $id = strtolower($id);
    if ($service = parent::get($id, ContainerInterface::NULL_ON_INVALID_REFERENCE)) {
      return $service;
    }
    if (!array_key_exists($id, $this->definitions) && isset($this->aliasDefinitions[$id])) {
      return $this
        ->get($this->aliasDefinitions[$id]);
    }
    try {
      $definition = $this
        ->getDefinition($id);
    } catch (InvalidArgumentException $e) {
      if (ContainerInterface::EXCEPTION_ON_INVALID_REFERENCE !== $invalidBehavior) {
        return;
      }
      throw $e;
    }
    $this->loading[$id] = true;
    try {
      $service = $this
        ->createService($definition, $id);
    } catch (\Exception $e) {
      unset($this->loading[$id]);
      if ($e instanceof InactiveScopeException && self::EXCEPTION_ON_INVALID_REFERENCE !== $invalidBehavior) {
        return;
      }
      throw $e;
    }
    unset($this->loading[$id]);
    return $service;
  }

  /**
   * Merges a ContainerBuilder with the current ContainerBuilder configuration.
   *
   * Service definitions overrides the current defined ones.
   *
   * But for parameters, they are overridden by the current ones. It allows
   * the parameters passed to the container constructor to have precedence
   * over the loaded ones.
   *
   * $container = new ContainerBuilder(array('foo' => 'bar'));
   * $loader = new LoaderXXX($container);
   * $loader->load('resource_name');
   * $container->register('foo', new stdClass());
   *
   * In the above example, even if the loaded resource defines a foo
   * parameter, the value will still be 'bar' as defined in the ContainerBuilder
   * constructor.
   *
   * @param ContainerBuilder $container The ContainerBuilder instance to merge.
   *
   * @throws BadMethodCallException When this ContainerBuilder is frozen
   *
   * @api
   */
  public function merge(ContainerBuilder $container) {
    if ($this
      ->isFrozen()) {
      throw new BadMethodCallException('Cannot merge on a frozen container.');
    }
    $this
      ->addDefinitions($container
      ->getDefinitions());
    $this
      ->addAliases($container
      ->getAliases());
    $this
      ->getParameterBag()
      ->add($container
      ->getParameterBag()
      ->all());
    if ($this->trackResources) {
      foreach ($container
        ->getResources() as $resource) {
        $this
          ->addResource($resource);
      }
    }
    foreach ($this->extensions as $name => $extension) {
      if (!isset($this->extensionConfigs[$name])) {
        $this->extensionConfigs[$name] = array();
      }
      $this->extensionConfigs[$name] = array_merge($this->extensionConfigs[$name], $container
        ->getExtensionConfig($name));
    }
  }

  /**
   * Returns the configuration array for the given extension.
   *
   * @param string $name The name of the extension
   *
   * @return array An array of configuration
   *
   * @api
   */
  public function getExtensionConfig($name) {
    if (!isset($this->extensionConfigs[$name])) {
      $this->extensionConfigs[$name] = array();
    }
    return $this->extensionConfigs[$name];
  }

  /**
   * Prepends a config array to the configs of the given extension.
   *
   * @param string $name   The name of the extension
   * @param array  $config The config to set
   */
  public function prependExtensionConfig($name, array $config) {
    if (!isset($this->extensionConfigs[$name])) {
      $this->extensionConfigs[$name] = array();
    }
    array_unshift($this->extensionConfigs[$name], $config);
  }

  /**
   * Compiles the container.
   *
   * This method passes the container to compiler
   * passes whose job is to manipulate and optimize
   * the container.
   *
   * The main compiler passes roughly do four things:
   *
   *  * The extension configurations are merged;
   *  * Parameter values are resolved;
   *  * The parameter bag is frozen;
   *  * Extension loading is disabled.
   *
   * @api
   */
  public function compile() {
    $compiler = $this
      ->getCompiler();
    if ($this->trackResources) {
      foreach ($compiler
        ->getPassConfig()
        ->getPasses() as $pass) {
        $this
          ->addObjectResource($pass);
      }
    }
    $compiler
      ->compile($this);
    if ($this->trackResources) {
      foreach ($this->definitions as $definition) {
        if ($definition
          ->isLazy() && ($class = $definition
          ->getClass()) && class_exists($class)) {
          $this
            ->addClassResource(new \ReflectionClass($class));
        }
      }
    }
    $this->extensionConfigs = array();
    parent::compile();
  }

  /**
   * Gets all service ids.
   *
   * @return array An array of all defined service ids
   */
  public function getServiceIds() {
    return array_unique(array_merge(array_keys($this
      ->getDefinitions()), array_keys($this->aliasDefinitions), parent::getServiceIds()));
  }

  /**
   * Adds the service aliases.
   *
   * @param array $aliases An array of aliases
   *
   * @api
   */
  public function addAliases(array $aliases) {
    foreach ($aliases as $alias => $id) {
      $this
        ->setAlias($alias, $id);
    }
  }

  /**
   * Sets the service aliases.
   *
   * @param array $aliases An array of aliases
   *
   * @api
   */
  public function setAliases(array $aliases) {
    $this->aliasDefinitions = array();
    $this
      ->addAliases($aliases);
  }

  /**
   * Sets an alias for an existing service.
   *
   * @param string       $alias The alias to create
   * @param string|Alias $id    The service to alias
   *
   * @throws InvalidArgumentException if the id is not a string or an Alias
   * @throws InvalidArgumentException if the alias is for itself
   *
   * @api
   */
  public function setAlias($alias, $id) {
    $alias = strtolower($alias);
    if (is_string($id)) {
      $id = new Alias($id);
    }
    elseif (!$id instanceof Alias) {
      throw new InvalidArgumentException('$id must be a string, or an Alias object.');
    }
    if ($alias === (string) $id) {
      throw new InvalidArgumentException(sprintf('An alias can not reference itself, got a circular reference on "%s".', $alias));
    }
    unset($this->definitions[$alias]);
    $this->aliasDefinitions[$alias] = $id;
  }

  /**
   * Removes an alias.
   *
   * @param string $alias The alias to remove
   *
   * @api
   */
  public function removeAlias($alias) {
    unset($this->aliasDefinitions[strtolower($alias)]);
  }

  /**
   * Returns true if an alias exists under the given identifier.
   *
   * @param string $id The service identifier
   *
   * @return bool true if the alias exists, false otherwise
   *
   * @api
   */
  public function hasAlias($id) {
    return isset($this->aliasDefinitions[strtolower($id)]);
  }

  /**
   * Gets all defined aliases.
   *
   * @return Alias[] An array of aliases
   *
   * @api
   */
  public function getAliases() {
    return $this->aliasDefinitions;
  }

  /**
   * Gets an alias.
   *
   * @param string $id The service identifier
   *
   * @return Alias An Alias instance
   *
   * @throws InvalidArgumentException if the alias does not exist
   *
   * @api
   */
  public function getAlias($id) {
    $id = strtolower($id);
    if (!isset($this->aliasDefinitions[$id])) {
      throw new InvalidArgumentException(sprintf('The service alias "%s" does not exist.', $id));
    }
    return $this->aliasDefinitions[$id];
  }

  /**
   * Registers a service definition.
   *
   * This methods allows for simple registration of service definition
   * with a fluid interface.
   *
   * @param string $id    The service identifier
   * @param string $class The service class
   *
   * @return Definition A Definition instance
   *
   * @api
   */
  public function register($id, $class = null) {
    return $this
      ->setDefinition($id, new Definition($class));
  }

  /**
   * Adds the service definitions.
   *
   * @param Definition[] $definitions An array of service definitions
   *
   * @api
   */
  public function addDefinitions(array $definitions) {
    foreach ($definitions as $id => $definition) {
      $this
        ->setDefinition($id, $definition);
    }
  }

  /**
   * Sets the service definitions.
   *
   * @param Definition[] $definitions An array of service definitions
   *
   * @api
   */
  public function setDefinitions(array $definitions) {
    $this->definitions = array();
    $this
      ->addDefinitions($definitions);
  }

  /**
   * Gets all service definitions.
   *
   * @return Definition[] An array of Definition instances
   *
   * @api
   */
  public function getDefinitions() {
    return $this->definitions;
  }

  /**
   * Sets a service definition.
   *
   * @param string     $id         The service identifier
   * @param Definition $definition A Definition instance
   *
   * @return Definition the service definition
   *
   * @throws BadMethodCallException When this ContainerBuilder is frozen
   *
   * @api
   */
  public function setDefinition($id, Definition $definition) {
    if ($this
      ->isFrozen()) {
      throw new BadMethodCallException('Adding definition to a frozen container is not allowed');
    }
    $id = strtolower($id);
    unset($this->aliasDefinitions[$id]);
    return $this->definitions[$id] = $definition;
  }

  /**
   * Returns true if a service definition exists under the given identifier.
   *
   * @param string $id The service identifier
   *
   * @return bool true if the service definition exists, false otherwise
   *
   * @api
   */
  public function hasDefinition($id) {
    return array_key_exists(strtolower($id), $this->definitions);
  }

  /**
   * Gets a service definition.
   *
   * @param string $id The service identifier
   *
   * @return Definition A Definition instance
   *
   * @throws InvalidArgumentException if the service definition does not exist
   *
   * @api
   */
  public function getDefinition($id) {
    $id = strtolower($id);
    if (!array_key_exists($id, $this->definitions)) {
      throw new InvalidArgumentException(sprintf('The service definition "%s" does not exist.', $id));
    }
    return $this->definitions[$id];
  }

  /**
   * Gets a service definition by id or alias.
   *
   * The method "unaliases" recursively to return a Definition instance.
   *
   * @param string $id The service identifier or alias
   *
   * @return Definition A Definition instance
   *
   * @throws InvalidArgumentException if the service definition does not exist
   *
   * @api
   */
  public function findDefinition($id) {
    $id = strtolower($id);
    while (isset($this->aliasDefinitions[$id])) {
      $id = (string) $this->aliasDefinitions[$id];
    }
    return $this
      ->getDefinition($id);
  }

  /**
   * Creates a service for a service definition.
   *
   * @param Definition $definition A service definition instance
   * @param string     $id         The service identifier
   * @param bool       $tryProxy   Whether to try proxying the service with a lazy proxy
   *
   * @return object The service described by the service definition
   *
   * @throws RuntimeException         When the scope is inactive
   * @throws RuntimeException         When the factory definition is incomplete
   * @throws RuntimeException         When the service is a synthetic service
   * @throws InvalidArgumentException When configure callable is not callable
   *
   * @internal this method is public because of PHP 5.3 limitations, do not use it explicitly in your code
   */
  public function createService(Definition $definition, $id, $tryProxy = true) {
    if ($definition
      ->isSynthetic()) {
      throw new RuntimeException(sprintf('You have requested a synthetic service ("%s"). The DIC does not know how to construct this service.', $id));
    }
    if ($tryProxy && $definition
      ->isLazy()) {
      $container = $this;
      $proxy = $this
        ->getProxyInstantiator()
        ->instantiateProxy($container, $definition, $id, function () use ($definition, $id, $container) {
        return $container
          ->createService($definition, $id, false);
      });
      $this
        ->shareService($definition, $proxy, $id);
      return $proxy;
    }
    $parameterBag = $this
      ->getParameterBag();
    if (null !== $definition
      ->getFile()) {
      require_once $parameterBag
        ->resolveValue($definition
        ->getFile());
    }
    $arguments = $this
      ->resolveServices($parameterBag
      ->unescapeValue($parameterBag
      ->resolveValue($definition
      ->getArguments())));
    if (null !== ($factory = $definition
      ->getFactory())) {
      if (is_array($factory)) {
        $factory = array(
          $this
            ->resolveServices($parameterBag
            ->resolveValue($factory[0])),
          $factory[1],
        );
      }
      elseif (!is_string($factory)) {
        throw new RuntimeException(sprintf('Cannot create service "%s" because of invalid factory', $id));
      }
      $service = call_user_func_array($factory, $arguments);
    }
    elseif (null !== $definition
      ->getFactoryMethod(false)) {
      if (null !== $definition
        ->getFactoryClass(false)) {
        $factory = $parameterBag
          ->resolveValue($definition
          ->getFactoryClass(false));
      }
      elseif (null !== $definition
        ->getFactoryService(false)) {
        $factory = $this
          ->get($parameterBag
          ->resolveValue($definition
          ->getFactoryService(false)));
      }
      else {
        throw new RuntimeException(sprintf('Cannot create service "%s" from factory method without a factory service or factory class.', $id));
      }
      $service = call_user_func_array(array(
        $factory,
        $definition
          ->getFactoryMethod(false),
      ), $arguments);
    }
    else {
      $r = new \ReflectionClass($parameterBag
        ->resolveValue($definition
        ->getClass()));
      $service = null === $r
        ->getConstructor() ? $r
        ->newInstance() : $r
        ->newInstanceArgs($arguments);
    }
    if ($tryProxy || !$definition
      ->isLazy()) {

      // share only if proxying failed, or if not a proxy
      $this
        ->shareService($definition, $service, $id);
    }
    foreach ($definition
      ->getMethodCalls() as $call) {
      $this
        ->callMethod($service, $call);
    }
    $properties = $this
      ->resolveServices($parameterBag
      ->resolveValue($definition
      ->getProperties()));
    foreach ($properties as $name => $value) {
      $service->{$name} = $value;
    }
    if ($callable = $definition
      ->getConfigurator()) {
      if (is_array($callable)) {
        $callable[0] = $callable[0] instanceof Reference ? $this
          ->get((string) $callable[0]) : $parameterBag
          ->resolveValue($callable[0]);
      }
      if (!is_callable($callable)) {
        throw new InvalidArgumentException(sprintf('The configure callable for class "%s" is not a callable.', get_class($service)));
      }
      call_user_func($callable, $service);
    }
    return $service;
  }

  /**
   * Replaces service references by the real service instance and evaluates expressions.
   *
   * @param mixed $value A value
   *
   * @return mixed The same value with all service references replaced by
   *               the real service instances and all expressions evaluated
   */
  public function resolveServices($value) {
    if (is_array($value)) {
      $value = array_map(array(
        $this,
        'resolveServices',
      ), $value);
    }
    elseif ($value instanceof Reference) {
      $value = $this
        ->get((string) $value, $value
        ->getInvalidBehavior());
    }
    elseif ($value instanceof Definition) {
      $value = $this
        ->createService($value, null);
    }
    elseif ($value instanceof Expression) {
      $value = $this
        ->getExpressionLanguage()
        ->evaluate($value, array(
        'container' => $this,
      ));
    }
    return $value;
  }

  /**
   * Returns service ids for a given tag.
   *
   * Example:
   *
   * $container->register('foo')->addTag('my.tag', array('hello' => 'world'));
   *
   * $serviceIds = $container->findTaggedServiceIds('my.tag');
   * foreach ($serviceIds as $serviceId => $tags) {
   *     foreach ($tags as $tag) {
   *         echo $tag['hello'];
   *     }
   * }
   *
   * @param string $name The tag name
   *
   * @return array An array of tags with the tagged service as key, holding a list of attribute arrays.
   *
   * @api
   */
  public function findTaggedServiceIds($name) {
    $tags = array();
    foreach ($this
      ->getDefinitions() as $id => $definition) {
      if ($definition
        ->hasTag($name)) {
        $tags[$id] = $definition
          ->getTag($name);
      }
    }
    return $tags;
  }

  /**
   * Returns all tags the defined services use.
   *
   * @return array An array of tags
   */
  public function findTags() {
    $tags = array();
    foreach ($this
      ->getDefinitions() as $id => $definition) {
      $tags = array_merge(array_keys($definition
        ->getTags()), $tags);
    }
    return array_unique($tags);
  }
  public function addExpressionLanguageProvider(ExpressionFunctionProviderInterface $provider) {
    $this->expressionLanguageProviders[] = $provider;
  }

  /**
   * @return ExpressionFunctionProviderInterface[]
   */
  public function getExpressionLanguageProviders() {
    return $this->expressionLanguageProviders;
  }

  /**
   * Returns the Service Conditionals.
   *
   * @param mixed $value An array of conditionals to return.
   *
   * @return array An array of Service conditionals
   */
  public static function getServiceConditionals($value) {
    $services = array();
    if (is_array($value)) {
      foreach ($value as $v) {
        $services = array_unique(array_merge($services, self::getServiceConditionals($v)));
      }
    }
    elseif ($value instanceof Reference && $value
      ->getInvalidBehavior() === ContainerInterface::IGNORE_ON_INVALID_REFERENCE) {
      $services[] = (string) $value;
    }
    return $services;
  }

  /**
   * Retrieves the currently set proxy instantiator or instantiates one.
   *
   * @return InstantiatorInterface
   */
  private function getProxyInstantiator() {
    if (!$this->proxyInstantiator) {
      $this->proxyInstantiator = new RealServiceInstantiator();
    }
    return $this->proxyInstantiator;
  }

  /**
   * Synchronizes a service change.
   *
   * This method updates all services that depend on the given
   * service by calling all methods referencing it.
   *
   * @param string $id A service id
   *
   * @deprecated since version 2.7, will be removed in 3.0.
   */
  private function synchronize($id) {
    if ('request' !== $id) {
      trigger_error('The ' . __METHOD__ . ' method is deprecated in version 2.7 and will be removed in version 3.0.', E_USER_DEPRECATED);
    }
    foreach ($this->definitions as $definitionId => $definition) {

      // only check initialized services
      if (!$this
        ->initialized($definitionId)) {
        continue;
      }
      foreach ($definition
        ->getMethodCalls() as $call) {
        foreach ($call[1] as $argument) {
          if ($argument instanceof Reference && $id == (string) $argument) {
            $this
              ->callMethod($this
              ->get($definitionId), $call);
          }
        }
      }
    }
  }
  private function callMethod($service, $call) {
    $services = self::getServiceConditionals($call[1]);
    foreach ($services as $s) {
      if (!$this
        ->has($s)) {
        return;
      }
    }
    call_user_func_array(array(
      $service,
      $call[0],
    ), $this
      ->resolveServices($this
      ->getParameterBag()
      ->resolveValue($call[1])));
  }

  /**
   * Shares a given service in the container.
   *
   * @param Definition $definition
   * @param mixed      $service
   * @param string     $id
   *
   * @throws InactiveScopeException
   */
  private function shareService(Definition $definition, $service, $id) {
    if (self::SCOPE_PROTOTYPE !== ($scope = $definition
      ->getScope())) {
      if (self::SCOPE_CONTAINER !== $scope && !isset($this->scopedServices[$scope])) {
        throw new InactiveScopeException($id, $scope);
      }
      $this->services[$lowerId = strtolower($id)] = $service;
      if (self::SCOPE_CONTAINER !== $scope) {
        $this->scopedServices[$scope][$lowerId] = $service;
      }
    }
  }
  private function getExpressionLanguage() {
    if (null === $this->expressionLanguage) {
      if (!class_exists('Symfony\\Component\\ExpressionLanguage\\ExpressionLanguage')) {
        throw new RuntimeException('Unable to use expressions as the Symfony ExpressionLanguage component is not installed.');
      }
      $this->expressionLanguage = new ExpressionLanguage(null, $this->expressionLanguageProviders);
    }
    return $this->expressionLanguage;
  }

}

Classes

Name	Description
ContainerBuilder	ContainerBuilder is a DI container that provides an API to easily describe services.