[kepler-dev] NIL token

[Christopher Brooks]

Hi Jing,

Good question, I was afraid there might be issues surrounding
Nil tokens and types.  My previous design had nil-ness being a
property of the token, so we had a DoubleToken that was of
type double and was nil.  Now we have just one token which is nil.

Can you construct a small model that has a similar failure?

Also, what's the stack trace of the current failure?
Perhaps where the types are being checked needs to be updated to
handle nilness
  
_Christopher
 
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    hi, Christopher:
    
    According to the changes you made in ptolemy about nil token, I made the 
    changes in kepler for missing value too.
    
    Since currently we only have one public static variable NIL in Token class 
    (NIL is a generic type and there is no any other nil in sub token 
    classes), I think every missing value element should be replaced by the 
    NIL token no matter what the data type it is. But when I run the workflow 
    test, I got some error:
    
    Workflow workflows/test/test-ecogrid-eml-gce-data.xml FAILED:
    [java] ptolemy.kernel.util.IllegalActionException: Run-time type checking 
    failed. Token nil with type general is
    incompatible with port type: int
    
    So it seems the NIL token is not compatible to int port type. Did I miss 
    something? How can I make the NIL token to compatible int port type?
    
    Thanks,
    
    Jing
    
    Jing Tao
    National Center for Ecological
    Analysis and Synthesis (NCEAS)
    735 State St. Suite 204
    Santa Barbara, CA 93101
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