@ Override public boolean retainAll ( Collection < ? > c ) { boolean modified = false ; for ( Map . Entry < Integer , Record > e : entries ( ) ) { Integer rId = e . getKey ( ) ; Record r = e . getValue ( ) ; if ( ! c . contains ( r ) ) { remove ( rId ) ; modified = true ; } } if ( modified ) { recalculateMeta ( ) ; } return modified ; }
Retains only the elements in this collection that are contained in the specified collection and updates the meta data .