code: private static void parseSuffix(final MediaRange mr, final String mediaType) {
  		final String subType=mr.subType;
  		final int plusIdx=subType.lastIndexOf('+');
  		if(plusIdx==0) {
  			throw new InvalidMediaTypeException(mediaType,"missing subtype for structured media type ("+subType.substring(1)+")");
  		} else if(plusIdx==subType.length()-1) {
  			throw new InvalidMediaTypeException(mediaType,"missing suffix for structured media type ("+subType.substring(0,subType.length()-1)+")");
  		} else if(plusIdx>0) {
  			mr.subType=subType.substring(0,plusIdx);
  			mr.suffix=subType.substring(plusIdx+1);
  		} // Otherwise the subtype does not define a structuring syntax.
  	}
docs: As per RFC 6838, Section 4.2 structuring syntaxes specifier syntaxes are
  defined after the last '+' symbol.
  
  @see <a href="https://tools.ietf.org/html/rfc6838#section-4.2>[RFC 6838]
  Media Type Specifications and Registration Procedures, Section
  4.2</a>