[kepler-dev] references to Java properties from within StringParameter entry fields

[Edward A. Lee]

If you use a FileParameter, then I know you can say

   $PTII/demos/...

Maybe $KEPLER will work too. If it doesn't, perhaps we should fix
it so it does.

Edward


Timothy McPhillips wrote:
> Hi Christopher,
> 
> Is there a convenient way to access the values of Java properties from 
> within the entry field for a StringParameter?
> 
> For a plain Parameter it appears one can refer to Java properties in 
> this manner:
> 
> Image:  
> property("KEPLER")+"/demos/getting-started/species-distribution.jpg"
> 
> But this requires using quotes to signify a string value.  In a 
> StringParameter one can refer to the values of other Variables in scope 
> (e.g., a Parameter defined on the workflow canvas) using the $ symbol, 
> and no quotes are needed.  For example, if I define a Parameter on the 
> canvas named 'Directory' that refers to the value of the Java property 
> 'COMAD_TESTS':
> 
> Directory:  property("COMAD_TESTS")
> 
> ..then in a StringParameter of an actor on that canvas I can refer to 
> the value of that Directory parameter:
> 
> File:  $Directory/test-files/TestCollectionReader_new.xml
> 
> What I can't seem to do is refer to the Java property directly in the 
> entry for the StringParameter, e.g. entering
> 
> $property("COMAD_TESTS")/test-files/TestCollectionReader_new.xml
> 
> gives the exception:
> 
> ptolemy.kernel.util.IllegalActionException: Error evaluating expression: 
> $property("COMAD_TESTS")/test-files/TestCollectionReader_new.xml
>   in .TestCollectionReader_test.CollectionReader_New.File
> Because:
> The ID property is undefined.
> 
> 
> Is there an easy way to do this?
> 
> Thanks!
> 
> Tim
> 
> 
> 
> 
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