}
      if (format == UPPER_UNDERSCORE) {
        return Ascii.toUpperCase(s);
      }
      return super.convert(format, s);
    }
  },

  /** Java variable naming convention, e.g., "lowerCamel". */
  LOWER_CAMEL(CharMatcher.inRange('A', 'Z'), "") {
    @Override
    String normalizeWord(String word) {
      return firstCharOnlyToUpper(word);
    }

    @Override
    String normalizeFirstWord(String word) {

      }
      if (format == UPPER_UNDERSCORE) {
        return Ascii.toUpperCase(s);
      }
      return super.convert(format, s);
    }
  },

  /** Java variable naming convention, e.g., "lowerCamel". */
  LOWER_CAMEL(CharMatcher.inRange('A', 'Z'), "") {
    @Override
    String normalizeWord(String word) {
      return firstCharOnlyToUpper(word);
    }

    @Override
    String normalizeFirstWord(String word) {

    assertThat(LOWER_CAMEL.to(LOWER_UNDERSCORE, "hTTP")).isEqualTo("h_t_t_p");
  }

  public void testLowerCamelToLowerCamel() {
    assertThat(LOWER_CAMEL.to(LOWER_CAMEL, "foo")).isEqualTo("foo");
    assertThat(LOWER_CAMEL.to(LOWER_CAMEL, "fooBar")).isEqualTo("fooBar");
  }

  public void testLowerCamelToUpperCamel() {
    assertThat(LOWER_CAMEL.to(UPPER_CAMEL, "foo")).isEqualTo("Foo");

            return key;
        }
        String keyStr = key.toString();
        if (keyStr.indexOf('_') < 0) {
            keyStr = CaseFormat.LOWER_CAMEL.to(CaseFormat.LOWER_UNDERSCORE, StringUtils.uncapitalize(keyStr));
        } else {
            keyStr = CaseFormat.LOWER_UNDERSCORE.to(CaseFormat.LOWER_CAMEL, keyStr);
        }
        return keyStr;
    }

    @Override
    public int size() {
        return parent.size();
    }