Method to

guava/src/com/google/common/base/CaseFormat.java:129–133

Converts the specified {@code String str} from this format to the specified {@code format}. A "best effort" approach is taken; if {@code str} does not conform to the assumed format, then the behavior of this method is undefined but we make a reasonable effort at converting anyway.

(CaseFormat format, String str)

   * the behavior of this method is undefined but we make a reasonable effort at converting anyway.
   */
  public final String to(CaseFormat format, String str) {
    checkNotNull(format);
    checkNotNull(str);
    return (format == this) ? str : convert(format, str);
  }

  /** Enum values can override for performance reasons. */
  String convert(CaseFormat format, String s) {