public Participant(ParticipantType type, String code, Display display) {
		if (type == null) {
			throw new IllegalArgumentException();
		}
		if (code == null || code.length() == 0) {
			throw new IllegalArgumentException();
		}
		if (display == null || display.size() == 0) {
			throw new IllegalArgumentException();
		}
		this.code = code;
		this.type = type;
		this.display = display;
	}