Enum with look-up map

Enum with look-up map

private enum Handlers {

  // Handlers
  PATTERN_PHRASE( "patternPhrase", patternPhrase ),
  PATTERN_SUB_SUP( "patternSubSup", patternSubSup ),
  PATTERN_NO_TEXY( "patternNoTexy", patternNoTexy );

  // Map names -> handlers.
  // Will this throw a NPE?
  // http://www.coderanch.com/t/449575/Programmer-Certification-SCJP/certification/enum-initialization-circularity
  static class Names {
    final static Map<String, PatternHandler> map = new HashMap();
  }

  // Members
  public final String name;
  public final PatternHandler handler;

  Handlers( String name, PatternHandler handler ) {
    this.name = name;
    this.handler = handler;
    Names.map.put( name, handler );
  }

  public static PatternHandler forName( String name ) {
    return Names.map.get( name );
  }
}