code: protected final String toKey(String cacheKey) {
          if (isUsingKeySanitizer()) {
              try {
                  return (String) keySanitizer.sanitizeKey(cacheKey);
              } catch (KeySanitationExcepion e) {
                  Ln.e(e, "Key could not be sanitized, falling back on original key.");
                  return cacheKey;
              }
          } else {
              return cacheKey;
          }
      }
docs: Get a key that may be sanitized if a {@link KeySanitizer} is used.
  @param cacheKey
  a non-sanitized cacheKey.
  @return a key that will be sanitized if a {@link KeySanitizer} is used.