return classNames;
        }

        public Set<String> getDisallowedClassNames() {
            return disallowedClassNames;
        }

        public Set<String> getDisallowedPackagePrefixes() {
            return disallowedPackagePrefixes;
        }
    }

    private static class TrieSet implements Iterable<String> {
        private final Trie trie;