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Convert Float to Double - by refInvokeOperation? [message #987622]

Tue, 27 November 2012 05:56

Eclipse User

Hi members,

I'm trying to assign a Float value from a source model object to a Double attribute of the matching target model object:

rule Real2Term {
    from
    	source: transformate!RealTransformer
    to
    	otxTerm: otx!FloatLiteral (
    		value <- source.value -> refInvokeOperation('doubleValue', Sequence{})
    	)
}

which produces the error

org.eclipse.m2m.atl.engine.emfvm.VMException: Wrong use of refInvokeOperation

.
otxTerm.value is Double, source.value is Float. There is no doubleValue helper (similar to longValue), so I'm trying to access the Java method, which fails.
Thanks for helping.

Re: Convert Float to Double - by refInvokeOperation? [message #987635 is a reply to message #987622]

Tue, 27 November 2012 06:42

Eclipse User

This seems to do the required transformation from Float to Double:

rule Real2Term {
    from
    	source: transformate!RealTransformer
    to
    	otxTerm: otx!FloatLiteral (
    		value <- 1.0 * source.value
    	)
}

However, I would be glad if you could provide an example on how to use refInvokeOperation. I have tried to do that several times unsuccessfully.
Thank you.

Re: Convert Float to Double - by refInvokeOperation? [message #987655 is a reply to message #987635]

Tue, 27 November 2012 08:05

Eclipse User

The refInvokeOperation allows to call an operation of a given element type.
For instance considering an operation SampleOperation defined for the type transformate!RealTransformer in your example, it could be called like this:

source.refInvokeOperation('SampleOperation',Sequence{})

Hugo

Re: Convert Float to Double - by refInvokeOperation? [message #987666 is a reply to message #987622]

Tue, 27 November 2012 08:53

Eclipse User

Hugo,

do I understand correctly that refInvokeOperation can only be used for model elements, but not - as I tried to do - for their attributes of 'plain' Java types, like Float in the given example?

Re: Convert Float to Double - by refInvokeOperation? [message #987671 is a reply to message #987666]

Tue, 27 November 2012 09:21

Eclipse User

refInvokeOperation has no sense if the method name is a contant.
This method is to be used with a variable method name otherwise you can call the method directly.

Re: Convert Float to Double - by refInvokeOperation? [message #987678 is a reply to message #987622]

Tue, 27 November 2012 09:46

Eclipse User

Sylvain, I'm still not getting it - does that mean an ATL method (= a helper), or a Java method?
In other words: How to call a method 'directly'?

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