this.propertiesRequiringIsEmptyCheck = propertiesRequiringIsEmptyCheck;
        }

        @Override
        public ImmutableSortedMap<String, ValueSnapshot> getValueSnapshots() {
            return valueSnapshots;
        }

        @Override
        public ImmutableSortedMap<String, ValueSnapshot> getAllValueSnapshots() {

                    .map(InvalidUserDataException::new)
                    .collect(toImmutableList())
            );
        }

        for (Map.Entry<String, ValueSnapshot> entry : result.getValueSnapshots().entrySet()) {
            hasher.putString(entry.getKey());
            entry.getValue().appendToHasher(hasher);
        }