/**
* Gets default constraints for the given data definition.
*
* This generates default constraint definitions based on the data definition;
* e.g. a NotNull constraint is generated if the data is defined as required.
* Besides that any constraints defined for the data type, i.e. below the
* 'constraint' key of the type's plugin definition, are taken into account.
*
* @param \Drupal\Core\TypedData\DataDefinitionInterface $definition
* A data definition.
*
* @return array
* An array of validation constraint definitions, keyed by constraint name.
* Each constraint definition can be used for instantiating
* \Symfony\Component\Validator\Constraint objects.
*/
public function getDefaultConstraints(DataDefinitionInterface $definition)
{
$constraints = array();
$type_definition = $this->getDefinition($definition->getDataType());
// Auto-generate a constraint for data types implementing a primitive
// interface.
if (is_subclass_of($type_definition['class'], '\\Drupal\\Core\\TypedData\\PrimitiveInterface')) {
$constraints['PrimitiveType'] = array();
}
// Add in constraints specified by the data type.
if (isset($type_definition['constraints'])) {
$constraints += $type_definition['constraints'];
}
// Add the NotNull constraint for required data.
if ($definition->isRequired()) {
$constraints['NotNull'] = array();
}
// Check if the class provides allowed values.
if (is_subclass_of($definition->getClass(), 'Drupal\\Core\\TypedData\\OptionsProviderInterface')) {
$constraints['AllowedValues'] = array();
}
// Add any constraints about referenced data.
if ($definition instanceof DataReferenceDefinitionInterface) {
$constraints += $definition->getTargetDefinition()->getConstraints();
}
return $constraints;
}
