/**
* Remove child {@link Entity}.
*
* @param child Child entity.
* @return {@code true} if Successfully removed. Otherwise {@code false}.
*/
public boolean remove(Entity child) {
final boolean removed = children.remove(child);
if (removed) {
child.parent = null;
}
return removed;
}
/**
* Add child {@link Entity}.
*
* @param child Child entity.
* @return {@code true} if Successfully added. Otherwise {@code false}.
*/
public boolean add(Entity child) {
final boolean added = children.add(child);
if (added) {
child.parent = this;
child.setApp(app);
}
return added;
}