while ( iter.hasNext() ) {
            String cachedKey = iter.next();
            int cachedKeyLen = cachedKey.length();

            boolean match = false;
            if ( cachedKeyLen == searchLen ) {
                match = cachedKey.equals(key);
            }
            else if ( cachedKeyLen < searchLen ) {
                match = key.startsWith(cachedKey);
            }