Brad Wood wrote:
> What's the best way to test for a Java NULL in CF?
> Should I just set the output of each of those methods into a variable,
> and then check for the variables existence?
That'll work.
<cfset path=my_url.getpath()/>
<cfif isdefined('path')> <!--- ... ---> </cfif>
We use a little Java class to tidy this (amongst other things) up that
I've attached - with luck the houseoffusion mailing list software will
leave it intact.
There are a few bits glued into the server scope at the CF end:
<cfscript>
server.undefined=createobject('java',
'horus.coldfusion.undefined').init();
function defined( value ) {
var argc=arguments.size();
value=server.undefined.assigned(value);
if (argc eq 1) return value;
if (value) return arguments[2];
if (argc gt 2) return arguments[3];
return '';
}
server.defined=defined;
</cfscript>
Using your my_url object, you could then do:
<cfdump var=#server.undefined.check(my_url.getpath(), 'NULL!')#/>
or
<cfset path=server.undefined.check(my_url.getpath())/>
<cfif server.defined(path)>
<!--- foo --->
<cfelse>
<!--- bar --->
</cfif>
It's worth noting that the "check" method must be called directly, with
the potentially-null-returning Java call as an argument; that's the only
way to bypass ColdFusion bleating about an undefined variable.
Having a NULL-surrogate value that can be used anywhere in ColdFusion is
*hugely* useful; I only wish that Macradobaire had seen fit to do it
properly in the first place.
--
Regards,
Pete Jordan
Horus Web Engineering Ltd
http://www.webhorus.net/
phone: +44 1275 543971
mobile: +44 7973 725120
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