Re: DefaultFamily and comparing RealTypes

• To: visad-list@xxxxxxxxxxxxx
• Subject: Re: DefaultFamily and comparing RealTypes
• From: Russell Steicke <r.steicke@xxxxxxxxxx>
• Date: Wed, 1 Aug 2001 21:22:19 +0800

Hi Andrew,

> I've been comparing RealTypes a bit, and it has just stopped working.
> I'm assuming that it's ok to use == on RealTypes as they seem to be
> a global sort of thing.  I am interested in testing the equality
> of the name and units etc, so I'm not using RealType.equals().
> 
> The problem is that the comparison's behaviour changes after
> I create a DefaultFamily.


Hi Andrew,

I altered your code a bit, and got these results with jdb...  To
summarise, when you include the DefaultFamily, your second RealType is
actually an instance of visad.data.netcdf.Quantity.  But that's as far
as I've got, you're on your own now. :)



----------------------
Without DefaultFamily:

$ jdb T
Initializing jdb...
> stop at T:17
Deferring breakpoint T:17.
It will be set after the class is loaded.
> run
run T
> 
VM Started: Set deferred breakpoint request T:17
Hello

Breakpoint hit: thread="main", T.main(), line=17, bci=22
  17    System.out.println("( " +

main[1] print T.lat
T.lat = instance of visad.RealType(id=263)
main[1] print T.lat2
T.lat2 = instance of visad.RealType(id=263)
main[1] cont
( Latitude = Latitude )= true
lat : Latitude deg null 0
lat2: Latitude deg null 0

The application exited
$

-----------------------------
With DefaultFamily:
$ jdb T
Initializing jdb...
> stop at T:17
Deferring breakpoint T:17.
It will be set after the class is loaded.
> run
run T
> 
VM Started: Set deferred breakpoint request T:17
Hello

Breakpoint hit: thread="main", T.main(), line=17, bci=32
  17    System.out.println("( " +

main[1] print T.lat
T.lat = instance of visad.RealType(id=339)
main[1] print T.lat2
T.lat2 = instance of visad.data.netcdf.Quantity(id=340)
main[1] cont
( Latitude = Latitude )= false
lat : Latitude deg null 0
lat2: Latitude deg null 0

The application exited
$

------------------------
Here's the code:


import visad.*;
import visad.data.DefaultFamily;

public class T
{
    static RealType lat, lat2;

    public static void main(String[] args)
    {
        System.out.println("Hello");
        
        //DefaultFamily defaultFamily = new DefaultFamily("dflt");
        
        lat = RealType.Latitude;
        lat2 = RealType.getRealType("Latitude");
        
        System.out.println("( " +
                           lat + " = " +
                           lat2 + " )= " +
                           (lat == lat2));
        System.out.println("lat : "+lat+" "
                           +lat.getDefaultUnit()+" "
                           +lat.getDefaultSet()+" "
                           +lat.getAttributeMask());
        System.out.println("lat2: "+lat+" "
                           +lat2.getDefaultUnit()+" "
                           +lat2.getDefaultSet()+" "
                           +lat2.getAttributeMask());
    }
}


-- 
Russell Steicke

-- Fortune says:
Don't quit now, we might just as well lock the door and throw away the key.

• References:
  • DefaultFamily and comparing RealTypes
    • From: Andrew Donaldson