@Nullable
	public String getValueFrom(MethodParameter parameter) {

		Assert.notNull(parameter, "MethodParameter must not be null!");
		Annotation annotation = parameter.getParameterAnnotation(annotationType);
		return annotation == null ? null : getValueFrom(annotation);
	}
@ Nullable public String getValueFrom ( MethodParameter parameter ) { Assert . notNull ( parameter , "MethodParameter must not be null!" ) ; Annotation annotation = parameter . getParameterAnnotation ( annotationType ) ; return annotation == null ? null : getValueFrom ( annotation ) ; }
Reads the {@link Annotation} attribute's value from the given {@link MethodParameter}.

@param parameter must not be {@literal null}.
@return