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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;
use Symfony\Component\DependencyInjection\Exception\InactiveScopeException;
use Symfony\Component\DependencyInjection\Exception\InvalidArgumentException;
use Symfony\Component\DependencyInjection\Exception\RuntimeException;
use Symfony\Component\DependencyInjection\Exception\ServiceNotFoundException;
use Symfony\Component\DependencyInjection\Exception\ServiceCircularReferenceException;
use Symfony\Component\DependencyInjection\ParameterBag\ParameterBagInterface;
use Symfony\Component\DependencyInjection\ParameterBag\ParameterBag;
use Symfony\Component\DependencyInjection\ParameterBag\FrozenParameterBag;
/**
* Container is a dependency injection container.
*
* It gives access to object instances (services).
*
* Services and parameters are simple key/pair stores.
*
* Parameter and service keys are case insensitive.
*
* A service id can contain lowercased letters, digits, underscores, and dots.
* Underscores are used to separate words, and dots to group services
* under namespaces:
*
* <ul>
* <li>request</li>
* <li>mysql_session_storage</li>
* <li>symfony.mysql_session_storage</li>
* </ul>
*
* A service can also be defined by creating a method named
* getXXXService(), where XXX is the camelized version of the id:
*
* <ul>
* <li>request -> getRequestService()</li>
* <li>mysql_session_storage -> getMysqlSessionStorageService()</li>
* <li>symfony.mysql_session_storage -> getSymfony_MysqlSessionStorageService()</li>
* </ul>
*
* The container can have three possible behaviors when a service does not exist:
*
* * EXCEPTION_ON_INVALID_REFERENCE: Throws an exception (the default)
* * NULL_ON_INVALID_REFERENCE: Returns null
* * IGNORE_ON_INVALID_REFERENCE: Ignores the wrapping command asking for the reference
* (for instance, ignore a setter if the service does not exist)
*
* @author Fabien Potencier <fabien@symfony.com>
* @author Johannes M. Schmitt <schmittjoh@gmail.com>
*
* @api
*/
class Container implements IntrospectableContainerInterface
{
/**
* @var ParameterBagInterface
*/
protected $parameterBag;
protected $services = array();
protected $methodMap = array();
protected $aliases = array();
protected $scopes = array();
protected $scopeChildren = array();
protected $scopedServices = array();
protected $scopeStacks = array();
protected $loading = array();
/**
* Constructor.
*
* @param ParameterBagInterface $parameterBag A ParameterBagInterface instance
*
* @api
*/
public function __construct(ParameterBagInterface $parameterBag = null)
{
$this->parameterBag = $parameterBag ?: new ParameterBag();
$this->set('service_container', $this);
}
/**
* Compiles the container.
*
* This method does two things:
*
* * Parameter values are resolved;
* * The parameter bag is frozen.
*
* @api
*/
public function compile()
{
$this->parameterBag->resolve();
$this->parameterBag = new FrozenParameterBag($this->parameterBag->all());
}
/**
* Returns true if the container parameter bag are frozen.
*
* @return Boolean true if the container parameter bag are frozen, false otherwise
*
* @api
*/
public function isFrozen()
{
return $this->parameterBag instanceof FrozenParameterBag;
}
/**
* Gets the service container parameter bag.
*
* @return ParameterBagInterface A ParameterBagInterface instance
*
* @api
*/
public function getParameterBag()
{
return $this->parameterBag;
}
/**
* Gets a parameter.
*
* @param string $name The parameter name
*
* @return mixed The parameter value
*
* @throws InvalidArgumentException if the parameter is not defined
*
* @api
*/
public function getParameter($name)
{
return $this->parameterBag->get($name);
}
/**
* Checks if a parameter exists.
*
* @param string $name The parameter name
*
* @return Boolean The presence of parameter in container
*
* @api
*/
public function hasParameter($name)
{
return $this->parameterBag->has($name);
}
/**
* Sets a parameter.
*
* @param string $name The parameter name
* @param mixed $value The parameter value
*
* @api
*/
public function setParameter($name, $value)
{
$this->parameterBag->set($name, $value);
}
/**
* Sets a service.
*
* Setting a service to null resets the service: has() returns false and get()
* behaves in the same way as if the service was never created.
*
* @param string $id The service identifier
* @param object $service The service instance
* @param string $scope The scope of the service
*
* @throws RuntimeException When trying to set a service in an inactive scope
* @throws InvalidArgumentException When trying to set a service in the prototype scope
*
* @api
*/
public function set($id, $service, $scope = self::SCOPE_CONTAINER)
{
if (self::SCOPE_PROTOTYPE === $scope) {
throw new InvalidArgumentException(sprintf('You cannot set service "%s" of scope "prototype".', $id));
}
$id = strtolower($id);
if (self::SCOPE_CONTAINER !== $scope) {
if (!isset($this->scopedServices[$scope])) {
throw new RuntimeException(sprintf('You cannot set service "%s" of inactive scope.', $id));
}
$this->scopedServices[$scope][$id] = $service;
}
$this->services[$id] = $service;
if (method_exists($this, $method = 'synchronize'.strtr($id, array('_' => '', '.' => '_', '\\' => '_')).'Service')) {
$this->$method();
}
if (self::SCOPE_CONTAINER !== $scope && null === $service) {
unset($this->scopedServices[$scope][$id]);
}
if (null === $service) {
unset($this->services[$id]);
}
}
/**
* Returns true if the given service is defined.
*
* @param string $id The service identifier
*
* @return Boolean true if the service is defined, false otherwise
*
* @api
*/
public function has($id)
{
$id = strtolower($id);
return isset($this->services[$id])
|| array_key_exists($id, $this->services)
|| isset($this->aliases[$id])
|| method_exists($this, 'get'.strtr($id, array('_' => '', '.' => '_', '\\' => '_')).'Service')
;
}
/**
* Gets a service.
*
* If a service is defined both through a set() method and
* with a get{$id}Service() method, the former has always precedence.
*
* @param string $id The service identifier
* @param integer $invalidBehavior The behavior when the service does not exist
*
* @return object The associated service
*
* @throws InvalidArgumentException if the service is not defined
* @throws ServiceCircularReferenceException When a circular reference is detected
* @throws ServiceNotFoundException When the service is not defined
*
* @see Reference
*
* @api
*/
public function get($id, $invalidBehavior = self::EXCEPTION_ON_INVALID_REFERENCE)
{
// Attempt to retrieve the service by checking first aliases then
// available services. Service IDs are case insensitive, however since
// this method can be called thousands of times during a request, avoid
// calling strtolower() unless necessary.
foreach (array(false, true) as $strtolower) {
if ($strtolower) {
$id = strtolower($id);
}
if (isset($this->aliases[$id])) {
$id = $this->aliases[$id];
}
// Re-use shared service instance if it exists.
if (isset($this->services[$id]) || array_key_exists($id, $this->services)) {
return $this->services[$id];
}
}
if (isset($this->loading[$id])) {
throw new ServiceCircularReferenceException($id, array_keys($this->loading));
}
if (isset($this->methodMap[$id])) {
$method = $this->methodMap[$id];
} elseif (method_exists($this, $method = 'get'.strtr($id, array('_' => '', '.' => '_', '\\' => '_')).'Service')) {
// $method is set to the right value, proceed
} else {
if (self::EXCEPTION_ON_INVALID_REFERENCE === $invalidBehavior) {
if (!$id) {
throw new ServiceNotFoundException($id);
}
$alternatives = array();
foreach (array_keys($this->services) as $key) {
$lev = levenshtein($id, $key);
if ($lev <= strlen($id) / 3 || false !== strpos($key, $id)) {
$alternatives[] = $key;
}
}
throw new ServiceNotFoundException($id, null, null, $alternatives);
}
return null;
}
$this->loading[$id] = true;
try {
$service = $this->$method();
} catch (\Exception $e) {
unset($this->loading[$id]);
if (array_key_exists($id, $this->services)) {
unset($this->services[$id]);
}
if ($e instanceof InactiveScopeException && self::EXCEPTION_ON_INVALID_REFERENCE !== $invalidBehavior) {
return null;
}
throw $e;
}
unset($this->loading[$id]);
return $service;
}
/**
* Returns true if the given service has actually been initialized
*
* @param string $id The service identifier
*
* @return Boolean true if service has already been initialized, false otherwise
*/
public function initialized($id)
{
$id = strtolower($id);
return isset($this->services[$id]) || array_key_exists($id, $this->services);
}
/**
* Gets all service ids.
*
* @return array An array of all defined service ids
*/
public function getServiceIds()
{
$ids = array();
$r = new \ReflectionClass($this);
foreach ($r->getMethods() as $method) {
if (preg_match('/^get(.+)Service$/', $method->name, $match)) {
$ids[] = self::underscore($match[1]);
}
}
return array_unique(array_merge($ids, array_keys($this->services)));
}
/**
* This is called when you enter a scope
*
* @param string $name
*
* @throws RuntimeException When the parent scope is inactive
* @throws InvalidArgumentException When the scope does not exist
*
* @api
*/
public function enterScope($name)
{
if (!isset($this->scopes[$name])) {
throw new InvalidArgumentException(sprintf('The scope "%s" does not exist.', $name));
}
if (self::SCOPE_CONTAINER !== $this->scopes[$name] && !isset($this->scopedServices[$this->scopes[$name]])) {
throw new RuntimeException(sprintf('The parent scope "%s" must be active when entering this scope.', $this->scopes[$name]));
}
// check if a scope of this name is already active, if so we need to
// remove all services of this scope, and those of any of its child
// scopes from the global services map
if (isset($this->scopedServices[$name])) {
$services = array($this->services, $name => $this->scopedServices[$name]);
unset($this->scopedServices[$name]);
foreach ($this->scopeChildren[$name] as $child) {
if (isset($this->scopedServices[$child])) {
$services[$child] = $this->scopedServices[$child];
unset($this->scopedServices[$child]);
}
}
// update global map
$this->services = call_user_func_array('array_diff_key', $services);
array_shift($services);
// add stack entry for this scope so we can restore the removed services later
if (!isset($this->scopeStacks[$name])) {
$this->scopeStacks[$name] = new \SplStack();
}
$this->scopeStacks[$name]->push($services);
}
$this->scopedServices[$name] = array();
}
/**
* This is called to leave the current scope, and move back to the parent
* scope.
*
* @param string $name The name of the scope to leave
*
* @throws InvalidArgumentException if the scope is not active
*
* @api
*/
public function leaveScope($name)
{
if (!isset($this->scopedServices[$name])) {
throw new InvalidArgumentException(sprintf('The scope "%s" is not active.', $name));
}
// remove all services of this scope, or any of its child scopes from
// the global service map
$services = array($this->services, $this->scopedServices[$name]);
unset($this->scopedServices[$name]);
foreach ($this->scopeChildren[$name] as $child) {
if (!isset($this->scopedServices[$child])) {
continue;
}
$services[] = $this->scopedServices[$child];
unset($this->scopedServices[$child]);
}
$this->services = call_user_func_array('array_diff_key', $services);
// check if we need to restore services of a previous scope of this type
if (isset($this->scopeStacks[$name]) && count($this->scopeStacks[$name]) > 0) {
$services = $this->scopeStacks[$name]->pop();
$this->scopedServices += $services;
foreach ($services as $array) {
foreach ($array as $id => $service) {
$this->set($id, $service, $name);
}
}
}
}
/**
* Adds a scope to the container.
*
* @param ScopeInterface $scope
*
* @throws InvalidArgumentException
*
* @api
*/
public function addScope(ScopeInterface $scope)
{
$name = $scope->getName();
$parentScope = $scope->getParentName();
if (self::SCOPE_CONTAINER === $name || self::SCOPE_PROTOTYPE === $name) {
throw new InvalidArgumentException(sprintf('The scope "%s" is reserved.', $name));
}
if (isset($this->scopes[$name])) {
throw new InvalidArgumentException(sprintf('A scope with name "%s" already exists.', $name));
}
if (self::SCOPE_CONTAINER !== $parentScope && !isset($this->scopes[$parentScope])) {
throw new InvalidArgumentException(sprintf('The parent scope "%s" does not exist, or is invalid.', $parentScope));
}
$this->scopes[$name] = $parentScope;
$this->scopeChildren[$name] = array();
// normalize the child relations
while ($parentScope !== self::SCOPE_CONTAINER) {
$this->scopeChildren[$parentScope][] = $name;
$parentScope = $this->scopes[$parentScope];
}
}
/**
* Returns whether this container has a certain scope
*
* @param string $name The name of the scope
*
* @return Boolean
*
* @api
*/
public function hasScope($name)
{
return isset($this->scopes[$name]);
}
/**
* Returns whether this scope is currently active
*
* This does not actually check if the passed scope actually exists.
*
* @param string $name
*
* @return Boolean
*
* @api
*/
public function isScopeActive($name)
{
return isset($this->scopedServices[$name]);
}
/**
* Camelizes a string.
*
* @param string $id A string to camelize
*
* @return string The camelized string
*/
public static function camelize($id)
{
return strtr(ucwords(strtr($id, array('_' => ' ', '.' => '_ ', '\\' => '_ '))), array(' ' => ''));
}
/**
* A string to underscore.
*
* @param string $id The string to underscore
*
* @return string The underscored string
*/
public static function underscore($id)
{
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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