public static CIKey getCommonKeyByLowerCase(final String lowerCaseKey) {
        if (lowerCaseKey == null) {
            return null;
        } else {
            return LOWER_KEY_TO_COMMON_CIKEY_MAP.get(lowerCaseKey);
        }
    }
A set of static common {@link CIKey} instances
stroom-util-shared/src/main/java/stroom/util/shared/string/CIKeys.java