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where to define a variable? [message #968648]

Fri, 02 November 2012 12:34

Kosala Yapa
Messages: 133
Registered: September 2010

Senior Member

Hi there,

In an atl rule, where can i define a variable ?

I defined in "using block", but it looks like a constant.

using{
n:Integer=1;
}

Thanks
K

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Re: where to define a variable? [message #971999 is a reply to message #968648]

Mon, 05 November 2012 04:21

Hugo Bruneliere
Messages: 465
Registered: July 2009

Senior Member

Hello,

For variables which are local to a given rule, the "using" section is effectively the good option: http://wiki.eclipse.org/ATL/User_Guide_-_The_ATL_Language#Local_variables_section.
FYI, for variables global to a whole transformation, you should rather use helper attributes: http://wiki.eclipse.org/ATL/User_Guide_-_The_ATL_Language#Attributes.
However, by using the declarative constructs and OCL iterators instead, it could be very likely that you don't actually need such variables.

Best regards,

Hugo

------------------------------------------
Hugo Bruneliere - R&D Engineer
AtlanMod research team (Inria, EMN & LINA)
Ecole des Mines de Nantes
Nantes - France
------------------------------------------

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Re: where to define a variable? [message #972418 is a reply to message #971999]

Mon, 05 November 2012 11:05

Kosala Yapa
Messages: 133
Registered: September 2010

Senior Member

Hi Hugo,

Thanks a mil for your reply.

helper context source!DeviceItem def: getModules():
Sequence(source!ModuleItem)= self.ModuleList.ModuleItem->select(mi|mi.getSlotValue()<>'0')->sortedBy(mi|mi.getSlotValue().toInteger());

I defined following two integer variables and do block in a lazy rule and later changed in a for loop.

problem: I always get num as 0. Can you see the error?

using{
num:Integer=0;
index:Integer=1;
}

do{

for(m2 in a.getModules())
{
num = m2.getSlotValue().toInteger()-index;
if ( num<>0)
{
p.Modules<-thisModule.rule_getNullModule(m2);
}
else
{
p.Modules<-thisModule.rule_getModule(m2);
}
index = index+1;
}-- for all Modules

}--end do

Thanks.
K

[Updated on: Mon, 05 November 2012 11:25]

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Re: where to define a variable? [message #972498 is a reply to message #972418]

Mon, 05 November 2012 12:20

Hugo Bruneliere
Messages: 465
Registered: July 2009

Senior Member

Variable (re)assignments in do sections have to performed using the <- operator and not the = one.

Best regards,

Hugo

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