Re: [Jaspa-users] Questions

[Jose C. M. <jom...@cg...>]

Hi Simon, I know you because of the mailing list and your great blog.

On 10/01/2012 3:53, Simon Greener wrote:
> Jaspa Users,
>
> I have a question. I am looking at either porting JASPA to Oracle to 
> work in conjunction with SDO_GEOMETRY
> or to pull out particular methods for use on their own augmenting 
> Oracle Sdo_Geometry functionality.
Marta Gonzales who has worked with me in the jaspa project is working 
now about porting Jaspa to Oracle 11g in her Master thesis. She has 
already done a good job about that using the spatial indexes and 
migrating most of the jaspa functionality. I dont know exactly the 
current status of her work but the idea is to add it to the jaspa release.

Marta is you read this email maybe you can give some details about your 
work to Simon.

>
> *Firstly*, I note that Jaspa appears to have its own version of JTS as 
> its definition of Coordinate.java includes a measure.
> I am currently working with JTS1.12 and its Coordinate.java does not 
> have a measure ordinate. Is this the case? How deep
> do the changes go? Is there a plan to fold them back into JTS?
yes, you are right, jaspa has modified JTS but just a little bit like 
the one you found out or a few methods. I dont think the changes are 
useful for every jts users thats why I didnt even ask Martin Davis about 
that.

>
> *Secondly*, I prefer to work with Java 1.4 as Oracle 10gR2 is 1.4 and 
> only 11g is 1.5.  All in all this doesn't look too difficult an issue
> if I pull out functions but more so if I work with Jaspa as a whole.
>
> *Thirdly*, JASPA seems to allow for auto conversion of primitive ints 
> to Integers, boolean to Boolean in its functions .... when moving
> back to an earlier JVM it is a pain because one has to do formal 
> conversions eg
>
> public static Double ST_Area(Geometry geom) {
>
> if (Core.isNullGeometry(geom)) return null;
>
> return geom.getArea();
> }
>
> public static Double ST_Area(Geometry geom) {
>
> if (Core.isNullGeometry(geom)) return null;
>
>   return new Double(geom.getArea()) ;
> }
>
> I can see why one might use class types over the primitive types but 
> wouldn't more formal casting/conversion from JTS to JASPA be
> better than compiler based conversion? But I have to admit I am not a 
> vastly experienced Java programmer. When going from Oracle's
> PL/SQL to the JVM I use primitive types.
I think you are right about formal casting/conversion, it was just for 
writing less code. You are talking just about the returning values or 
you found any other problem with java 1.4 and Oracle?
Anyways this project is mainly maintained by me and I dont think i can 
change the source code a lot right now because lack of time. For the 
next release I can change the casting as you suggested if you think this 
is really worth it.

Regards,
Jose


>
> That is all for now.
>
> regards
> Simon
> -- 
> Holder of "2011 Oracle Spatial Excellence Award for Education and 
> Research."
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