protected void setTupleToStringConverter(Converter<Tuple, String> tupleToStringConverter) {
		Assert.notNull(tupleToStringConverter, "tupleToStringConverter cannot be null");
		this.tupleToStringConverter = tupleToStringConverter;
	}
@param tupleToStringConverter used to convert a {@link Tuple} to a String
spring-xd-tuple/src/main/java/org/springframework/xd/tuple/DefaultTuple.java