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<?php
namespace Drupal\Core\Plugin;
use Drupal\Component\Plugin\Exception\InvalidPluginDefinitionException;
use Drupal\Component\Plugin\PluginAwareInterface;
use Drupal\Core\DependencyInjection\ClassResolverInterface;
/**
* Provides form discovery capabilities for plugins.
*/
class PluginFormFactory implements PluginFormFactoryInterface {
/**
* The class resolver.
*
* @var \Drupal\Core\DependencyInjection\ClassResolverInterface
*/
protected $classResolver;
/**
* PluginFormFactory constructor.
*
* @param \Drupal\Core\DependencyInjection\ClassResolverInterface $class_resolver
* The class resolver.
*/
public function __construct(ClassResolverInterface $class_resolver) {
$this->classResolver = $class_resolver;
}
/**
* {@inheritdoc}
*/
public function createInstance(PluginWithFormsInterface $plugin, $operation, $fallback_operation = NULL) {
if (!$plugin->hasFormClass($operation)) {
// Use the default form class if no form is specified for this operation.
if ($fallback_operation && $plugin->hasFormClass($fallback_operation)) {
$operation = $fallback_operation;
}
else {
throw new InvalidPluginDefinitionException($plugin->getPluginId(), sprintf('The "%s" plugin did not specify a "%s" form class', $plugin->getPluginId(), $operation));
}
}
$form_class = $plugin->getFormClass($operation);
// If the form specified is the plugin itself, use it directly.
if (ltrim(get_class($plugin), '\\') === ltrim($form_class, '\\')) {
$form_object = $plugin;
}
else {
$form_object = $this->classResolver->getInstanceFromDefinition($form_class);
}
// Ensure the resulting object is a plugin form.
if (!$form_object instanceof PluginFormInterface) {
throw new InvalidPluginDefinitionException($plugin->getPluginId(), sprintf('The "%s" plugin did not specify a valid "%s" form class, must implement \Drupal\Core\Plugin\PluginFormInterface', $plugin->getPluginId(), $operation));
}
if ($form_object instanceof PluginAwareInterface) {
$form_object->setPlugin($plugin);
}
return $form_object;
}
}