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Richard,
Gundersen, Richard wrote:
> Can anyone please tell me why this works. It's two versions of a
> validation rule from my commons validator xml file (for a validwhen
> condition):
The parser that the validation package uses cannot parse expressions of
the form "A or B or C" ("or" can be replaced with "and" anywhere, here).
They have a relatively simple expression syntax that only supports
binary logical expressions (although, without too much trouble, adding
right- or left-associativity for logical operators isn't really that
tough, and most programmers expect that kind of thing).
So, instead, you have to do this:
(A or B) or C
Looking at your "it doesn't work" scenario, you have the situation above
that I mentioned if you just call this "A":
((oldProductStatusId == 21) and ( (productStatusId == 21) or
(productStatusId == 23)))
and this "B":
((oldProductStatusId == 23) and ( (productStatusId == 23) or
(productStatusId == 22))) or
and this "C":
((oldProductStatusId == 23) and ( (productStatusId == 23) or
(productStatusId == 22)))
You need to wrap your first two logical combinations in yet another set
of parenthesis.
Hope that helps,
- -chris
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