/**
* Returns all required/mandatory Fields
*
* @return FieldCollection
*/
public function getMandatoryFields()
{
$retCollection = new FieldCollection();
foreach ($this->getFields() as $field) {
if ($field instanceof Field\CommonProperties\RequiredInterface && $field->isRequired()) {
$retCollection->addField($field);
}
}
return $retCollection;
}
/**
* Filter fields
*
* @param callable $filter
* @return self
*/
public function filter(callable $filter)
{
$this->fields = $this->fields->filter($filter);
return $this;
}
