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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\Form;
use Symfony\Component\Form\Exception\FormException;
use Symfony\Component\Form\Exception\UnexpectedTypeException;
/**
* @author Bernhard Schussek <bernhard.schussek@symfony.com>
*/
abstract class AbstractExtension implements FormExtensionInterface
{
/**
* The types provided by this extension
* @var array An array of FormTypeInterface
*/
private $types;
/**
* The type extensions provided by this extension
* @var array 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;
/**
* Returns a type by name.
*
* @param string $name The name of the type
*
* @return FormTypeInterface The type
*
* @throws FormException if the given type is not supported by this extension
*/
public function getType($name)
{
if (null === $this->types) {
$this->initTypes();
}
if (!isset($this->types[$name])) {
throw new FormException(sprintf('The type "%s" can not be loaded by this extension', $name));
}
return $this->types[$name];
}
/**
* Returns whether the given type is supported.
*
* @param string $name The name of the type
*
* @return Boolean Whether the type is supported by this extension
*/
public function hasType($name)
{
if (null === $this->types) {
$this->initTypes();
}
return isset($this->types[$name]);
}
/**
* Returns the extensions for the given type.
*
* @param string $name The name of the type
*
* @return array An array of extensions as FormTypeExtensionInterface instances
*/
public function getTypeExtensions($name)
{
if (null === $this->typeExtensions) {
$this->initTypeExtensions();
}
return isset($this->typeExtensions[$name])
? $this->typeExtensions[$name]
: array();
}
/**
* Returns whether this extension provides type extensions for the given type.
*
* @param string $name The name of the type
*
* @return Boolean Whether the given type has extensions
*/
public function hasTypeExtensions($name)
{
if (null === $this->typeExtensions) {
$this->initTypeExtensions();
}
return isset($this->typeExtensions[$name]) && count($this->typeExtensions[$name]) > 0;
}
/**
* Returns the type guesser provided by this extension.
*
* @return FormTypeGuesserInterface|null The type guesser
*/
public function getTypeGuesser()
{
if (!$this->typeGuesserLoaded) {
$this->initTypeGuesser();
}
return $this->typeGuesser;
}
/**
* Registers the types.
*
* @return array An array of FormTypeInterface instances
*/
protected function loadTypes()
{
return array();
}
/**
* Registers the type extensions.
*
* @return array 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');
}
}
}
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