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common understand, let blocks [message #689674]

Tue, 28 June 2011 06:53

Norman

Messages: 17
Registered: June 2011

Junior Member

Hi,

I switched to Acceleo 3.

Why that doesn't work?

[template public next (node : ActivityNode) post (trim())]
[let TargetString : String = node.outgoing.target][TargetString/][/let]

But this does:

[template public next (node : ActivityNode) post (trim())]
[let TargetString : String = node][TargetString/][/let]

I don't understand this, the Node has a following Node.

Thanks and bb

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Re: common understand, let blocks [message #689881 is a reply to message #689674]

Tue, 28 June 2011 14:36

Stephane Begaudeau

Messages: 458
Registered: April 2010
Location: Nantes (France)

Senior Member

Hi,

In Acceleo, the "let x : Type = something" block is strickly equals to "if (something instanceof Type) {Type x = (Type)something;". SO in your case, "node.outgoing.target" is not an instance of TargetString. I believe that outgoint or target is null. You can test it with something like this:

[template public next (node : ActivityNode) post (trim())]
node.outgoing = null: [node.oclIsUndefined()/]
node.outgoing = null: [node.outgoing.oclIsUndefined()/]
node.outgoing.target = null: [node.outgoing.targetoclIsUndefined()/]
[/template]

You could also use the Acceleo debugger with a well placed breakpoint to examine the state of the variables.

Regards,

Stephane Begaudeau, Obeo

--
Twitter: @sbegaudeau
Blog: http://stephanebegaudeau.tumblr.com
Acceleo Documentation: http://docs.obeonetwork.com/acceleo

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