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String concatenation in MTL scripts [message #468482]

Wed, 05 August 2009 12:06

Eclipse User

I'm trying some string concatenation in MTL scripts using the "+" operator:
[file ('file://'+c.name+'.java', false)]
This fails with "Cannot find operation (+(String)) for the type (String)".
Anybody any ideas?
Thanks for them,
Siegfried

Re: String concatenation in MTL scripts [message #477844 is a reply to message #468482]

Thu, 06 August 2009 02:50

Eclipse User

Hi Siegfried,
you have to use the concat method. Unfortunately, the + operator as a
shortcut for the concat method is not part of the MTL-standard. This is
the correct version of your example:
[file ('file://'.concat(c.name).concat('.java'), false)]

Greetings,
Max

Re: String concatenation in MTL scripts [message #477861 is a reply to message #477844]

Thu, 06 August 2009 03:04

Eclipse User

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Hi Siegfried, Max,

"concat" is indeed the correct way of concatening Strings in OCL. The
incoming version will add the "+" operator, but that's in the future :p.

Laurent Goubet
Obeo

Max Bureck a

Re: String concatenation in MTL scripts [message #477868 is a reply to message #477861]

Thu, 06 August 2009 03:24

Eclipse User

Hi Max, Laurent,

thanks to both of you for help.

@Max:
I took my example from the OMG's MTL specification.

Siegfried

Re: String concatenation in MTL scripts [message #478780 is a reply to message #477868]

Thu, 06 August 2009 16:09

Eclipse User

You're right. The + operator is used in the examples without specifying
it. Last time I checked it was not part of the OCL-standard, so it must be
specified explicitly. The QVT-standard, which also uses OCL declares this
shortcut explicitly (see page 38 for QVT/R and page 119 for QVT/OM). I
guess the authors of the standard simply forgot to declare the shortcut
for MTL.

Re: String concatenation in MTL scripts [message #478825 is a reply to message #478780]

Fri, 07 August 2009 03:22

Eclipse User

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Hi,

Most of the examples given in the MOFM2T specification sport at least
one syntax error, the "+" between Strings being one of the most
annoying. As I mentionned, the incoming version of OCL declares this
shortcut for "concat". Given that, I doubt the shortcut will also be
declared in the MOFM2T specification; we'll have to wait for OCL to get
updated.

Laurent Goubet
Obeo

Max Bureck a

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