Hi Curtis,
I'm actually trying to have null values for just the DisplayRealType and
not the ScalarType. I want the possibility for an input field to be
mapped to a null value as one possible visualization instead of *always*
mapping every single input field in the data set to a VisAD parameter.
However, as I dig further and further into the original code, I'm
finding that I would have to modify many classes to avoid null pointer
exceptions. Am I correct that there would be no simple way to wrap a
null DisplayRealType without getting null pointer exceptions?
Thanks,
Michelle
Michelle Kam (408) 742-2881
Lockheed Martin Space Systems Co. SSM/ATC/MSIS
B/153 O/L922
1111 Lockheed Martin Way, Sunnyvale, CA 94089
-----Original Message-----
From: Curtis Rueden [mailto:curtis@xxxxxxxxxxxxx]
Sent: Thursday, July 17, 2003 2:40 PM
To: Kam, Michelle C
Subject: Re: null scalary type in ScalarMap
Hi Michelle,
Intuitively, a ScalarMap with null ScalarType or null DisplayRealType
would serve no purpose when added to a display. I see no reason to
create
such ScalarMaps. What are you trying to accomplish?
-Curtis
At 03:50 PM 7/17/2003, you wrote:
>Hello,
>
>I am trying to construct a ScalarMap with a null value as one or both
of the parameters passed in to ScalarMap(ScalarType scalar,
DisplayRealType display_scalar). I tried commenting out the following
code in the ScalarMap constructor:
>
> /*
> if (scalar == null && needNonNullScalar) {
> throw new DisplayException("ScalarMap: scalar is null");
> }
> if (display_scalar == null) {
> throw new DisplayException("ScalarMap: display_scalar is null");
> }
>*/
>
>However, I will get a null pointer later in that constructor if
"scalar" or "display_scalar" are passed in as null. Is there a way to
wrap a null value for "display_scalar" or "scalar" before it is passed
in to create a ScalarMap?
>
>Thanks,
>Michelle
>
>Michelle Kam (408) 742-2881
>Lockheed Martin Space Systems Co. SSM/ATC/MSIS
>B/153 O/L922
>1111 Lockheed Martin Way, Sunnyvale, CA 94089
