| Use of ChoiceFormat in View/Edit Pattern on Labels [message #217523] |
Fri, 06 February 2009 15:44  |
 Mark Wood
Messages: 8
Registered: July 2009 |
Junior Member |
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Hello,
I'm having a problem trying to conditionally format the content of labels
on GMF diagrams.
Basically, I have a Cardinality attribute on a Reference concept in my
Meta Model, this is modelled as an Integer. I model one-to-many references
as -1, many-to-one as -2 and many-to-many as -3. Non-negative
cardinalities are left as is. When labelling a Reference in my GMF diagram
I wish it to convert the string I give it to the correct underlying format
as such:
"1..*" -> -1
"*..1" -> -2
"*..*" -> -3
"3" -> 3
In order to accomplish this I'm trying to use View and Edit Patterns
however there isn't a huge amount of documentation on these. For my
View/Edit/Editor Pattern I currently use the expression:
{0,choice,-3#*..*|-2#*..1|-1#1..*|-1<{0}}
This is a ChoiceFormat expression in the form as described here:
http://java.sun.com/javase/6/docs/api/java/text/MessageForma t.html
However, I cannot seem to get the format correct. Using the above
expression, although correct for the View, I don't think it's quite right
for the Edit/Editor patterns. Consequently, the current behaviour allows
me to enter the first 3 rules from earlier but fails to change the label
value when I enter regular values such as "10" or "5".
It's quite difficult to explain the behaviour as it varies only slightly
for each adjustment, but I hope you can understand what I'm trying to do.
Essentially I just want to pretty print certain values (-1, -2, -3) such
that if I type 1..*, *..1, *..* (respectively) into a label, it converts
the underlying value into the correct Integer so I can then process it
later on.
Any advice would be very much appreciated. If View/Edit/Editor Patterns
are not the best way to solve the problem then I am keen to hear
suggestions on other possible solutions.
Thanks in advance,
Mark
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