public boolean containsAndNot(final EntityIdentifiable entity, final EntityIdentifiable entity2) {
   assert Assert.notNull(entity);
   assert Assert.notNull(entity2);
   return this.containsAndNot(entity.getId(), entity2.getId());
 }
 public boolean contains(final EntityIdentifiable entity) {
   assert Assert.notNull(entity);
   return this.contains(entity.getId());
 }