public final boolean containsSingle( @Nullable final KEYTYPE aKey, @Nullable final VALUETYPE aValue) { final COLLTYPE aCont = get(aKey); return aCont != null && aCont.contains(aValue); }
@Nonnull public final EChange removeSingle( @Nullable final KEYTYPE aKey, @Nullable final VALUETYPE aValue) { final COLLTYPE aCont = get(aKey); return aCont == null ? EChange.UNCHANGED : EChange.valueOf(aCont.remove(aValue)); }