Creates a new form instance.

Parameters

\Drupal\Core\Plugin\PluginWithFormsInterface $plugin: The plugin the form is for.

string $operation: The name of the operation to use, e.g., 'add' or 'edit'.

string $fallback_operation: (optional) The name of the fallback operation to use.

Return value

\Drupal\Core\Plugin\PluginFormInterface A plugin form instance.

Overrides PluginFormFactoryInterface::createInstance

File

core/lib/Drupal/Core/Plugin/PluginFormFactory.php, line 34

Class

PluginFormFactory

Provides form discovery capabilities for plugins.

Namespace

Drupal\Core\Plugin

Code

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;
}

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