/**
* Returns any sub-elements for the given element.
*
* This method checks whether the given element is a class, interface or trait and returns
* their methods, properties and constants accordingly, or an empty array if no sub-elements
* are applicable.
*
* @param DescriptorAbstract $element
*
* @return DescriptorAbstract[]
*/
protected function getSubElements(DescriptorAbstract $element)
{
$subElements = array();
if ($element instanceof ClassInterface) {
$subElements = array_merge($element->getMethods()->getAll(), $element->getConstants()->getAll(), $element->getProperties()->getAll());
}
if ($element instanceof InterfaceInterface) {
$subElements = array_merge($element->getMethods()->getAll(), $element->getConstants()->getAll());
}
if ($element instanceof TraitInterface) {
$subElements = array_merge($element->getMethods()->getAll(), $element->getProperties()->getAll());
}
return $subElements;
}