code: public static Formatter getFormatterInstance(String name) {
  		String key = (name != null) ? name.toLowerCase() : "";
  		return formatters.get(key);
  	}
docs: This method maps a formatter name to a <code>Formatter</code> instance.
  If the formatter name is unknown, then null will be returned. The name
  comparison ignores the case of the given name.
  
  @param name
  name of the formatter
  
  @return <code>Formatter</code> instance corresponding to the name or null
  if the formatter name is unknown