Re: [henshin-dev] Execute rules according to parameter values

[Johannes Tietje <johannes.tietje@xxxxxxxxxxxxxxxxx>]

Hello Enrico,

thank you again for your help, it worked.

Regards,
Johannes

Am Freitag, den 08.04.2011, 11:19 +0200 schrieb Enrico Biermann: 
> Hello Johannes,
> 
> you can check for a specific value with an  empty rule. For example if
> you want to check whether a paramter "x" is null or not, you create an
> empty rule with an attribute condition x == null.
> In your case this empty rule would be put as the if-clause of a
> ConditionalUnit and the other rule sets in when and else.
> 
> Regards,
> Enrico
> 
> On 08.04.2011 10:38, Johannes Tietje wrote:
> > Hello,
> >
> > I have a transformation unit with a parameter which will be set under
> > special circumstances by some (but not all) the contained rules---which
> > means, that after the transformation unit has been executed, the
> > parameter could be "null" or not. (Am I right?)
> >
> > Later, I want to execute one set of rules if this parameter is "null"
> > and another set, if not---is this possible through a condition unit
> > checking the parameter value?
> >
> > If this causes too much trouble, another solution could be a kind of
> > "default" value for a parameter, so that if no rule changes the
> > parameter it has at least its previously set default value.
> >
> > Regards,
> > Johannes
> >
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