tds/src/main/java/thredds/server/config/TdsConfigMapper.java
private static String getValueFromThreddsConfig(String key, String alternateKey, String defaultValue) {
    String value = ThreddsConfig.get(key, null);
    if (value == null && alternateKey != null)
      value = ThreddsConfig.get(alternateKey, null);
    if (value == null)
      value = defaultValue;
    return value;
  }
private static String getValueFromThreddsConfig(String key, String alternateKey, String defaultValue) {
    String value = ThreddsConfig.get(key, null);
    if (value == null && alternateKey != null)
      value = ThreddsConfig.get(alternateKey, null);
    if (value == null)
      value = defaultValue;
    return value;
  }
static so can be called from static enum classes