/*
		 * The limit checking methods interpret a null context as a global limit
		 * to be enforced. We do not wish to support a global limit in this
		 * implementation, so we throw an exception for a null context. The rest
		 * of the implementation can handle a null context, so subclasses can
		 * override this if a global limit is desired.
		 */
		Assert.isNotNull(context);