/**
* {@inheritDoc}
*
* <p>This implementation iterates over the elements of this list, checking each element in turn
* to see if it's contained in <code>coll</code>. If it's not contained, it's removed from this
* list. As a consequence, it is advised to use a collection type for <code>coll</code> that
* provides a fast (e.g. O(1)) implementation of {@link Collection#contains(Object)}.
*/
@Override
public boolean retainAll(final Collection<?> coll) {
boolean result = set.retainAll(coll);
if (result == false) {
return false;
}
if (set.size() == 0) {
super.clear();
} else {
// use the set as parameter for the call to retainAll to improve performance
super.retainAll(set);
}
return result;
}
public void clear() {
super.clear();
set.clear();
}
@Override
public void clear() {
super.clear();
set.clear();
}