commons/http/src/main/java/org/ldp4j/http/ImmutableMediaType.java
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.
	}
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.
	}
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>