* * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. */ namespace Symfony\Component\Form; use Symfony\Component\Form\Exception\InvalidArgumentException; use Symfony\Component\Form\Exception\UnexpectedTypeException; /** * @author Bernhard Schussek */ abstract class AbstractExtension implements FormExtensionInterface { /** * The types provided by this extension * @var FormTypeInterface[] An array of FormTypeInterface */ private $types; /** * The type extensions provided by this extension * @var FormTypeExtensionInterface[] An array of FormTypeExtensionInterface */ private $typeExtensions; /** * The type guesser provided by this extension * @var FormTypeGuesserInterface */ private $typeGuesser; /** * Whether the type guesser has been loaded * @var Boolean */ private $typeGuesserLoaded = false; /** * {@inheritdoc} */ public function getType($name) { if (null === $this->types) { $this->initTypes(); } if (!isset($this->types[$name])) { throw new InvalidArgumentException(sprintf('The type "%s" can not be loaded by this extension', $name)); } return $this->types[$name]; } /** * {@inheritdoc} */ public function hasType($name) { if (null === $this->types) { $this->initTypes(); } return isset($this->types[$name]); } /** * {@inheritdoc} */ public function getTypeExtensions($name) { if (null === $this->typeExtensions) { $this->initTypeExtensions(); } return isset($this->typeExtensions[$name]) ? $this->typeExtensions[$name] : array(); } /** * {@inheritdoc} */ public function hasTypeExtensions($name) { if (null === $this->typeExtensions) { $this->initTypeExtensions(); } return isset($this->typeExtensions[$name]) && count($this->typeExtensions[$name]) > 0; } /** * {@inheritdoc} */ public function getTypeGuesser() { if (!$this->typeGuesserLoaded) { $this->initTypeGuesser(); } return $this->typeGuesser; } /** * Registers the types. * * @return FormTypeInterface[] An array of FormTypeInterface instances */ protected function loadTypes() { return array(); } /** * Registers the type extensions. * * @return FormTypeExtensionInterface[] An array of FormTypeExtensionInterface instances */ protected function loadTypeExtensions() { return array(); } /** * Registers the type guesser. * * @return FormTypeGuesserInterface|null A type guesser */ protected function loadTypeGuesser() { return null; } /** * Initializes the types. * * @throws UnexpectedTypeException if any registered type is not an instance of FormTypeInterface */ private function initTypes() { $this->types = array(); foreach ($this->loadTypes() as $type) { if (!$type instanceof FormTypeInterface) { throw new UnexpectedTypeException($type, 'Symfony\Component\Form\FormTypeInterface'); } $this->types[$type->getName()] = $type; } } /** * Initializes the type extensions. * * @throws UnexpectedTypeException if any registered type extension is not * an instance of FormTypeExtensionInterface */ private function initTypeExtensions() { $this->typeExtensions = array(); foreach ($this->loadTypeExtensions() as $extension) { if (!$extension instanceof FormTypeExtensionInterface) { throw new UnexpectedTypeException($extension, 'Symfony\Component\Form\FormTypeExtensionInterface'); } $type = $extension->getExtendedType(); $this->typeExtensions[$type][] = $extension; } } /** * Initializes the type guesser. * * @throws UnexpectedTypeException if the type guesser is not an instance of FormTypeGuesserInterface */ private function initTypeGuesser() { $this->typeGuesserLoaded = true; $this->typeGuesser = $this->loadTypeGuesser(); if (null !== $this->typeGuesser && !$this->typeGuesser instanceof FormTypeGuesserInterface) { throw new UnexpectedTypeException($this->typeGuesser, 'Symfony\Component\Form\FormTypeGuesserInterface'); } } }