Eclipse Community Forums: EMF » getOldValue call on Notification from validationOccurred returns null

Help

Home

Home » Modeling » EMF » getOldValue call on Notification from validationOccurred returns null

Show: Today's Messages :: Show Polls :: Message Navigator

getOldValue call on Notification from validationOccurred returns null [message #908237]

Wed, 05 September 2012 01:59

Al B

Messages: 47
Registered: June 2012

Member

Why does the getOldValue call on Notification from the validationOccurred() method return null as opposed to old value?

public void validationOccurred(ValidationEvent event) {
for (Object target : event.getValidationTargets()) {
if (target instanceof Notification) {
Notification notification = (Notification) target;
notification.getOldValue() // is always null
notification.getNewValue() // returns the new value

[Updated on: Wed, 05 September 2012 01:59]

Report message to a moderator

Re: getOldValue call on Notification from validationOccurred returns null [message #908279 is a reply to message #908237]

Wed, 05 September 2012 04:38

Ed Merks

Messages: 33141
Registered: July 2009

Senior Member

AJ,

Depending on the type of notification it may well be null. I.e., if all
you did was add things to lists then no notification will have an old
value. You can set a breakpoint in ENotificationImpl's constructors to
see how they're being created and whether they're being passed the
appropriate values; the ones created by the generated models should all
be correct, but if the extended validation framework has created some
itself, those could have overlooked something...

On 05/09/2012 3:59 AM, AJ Ben wrote:
> Why does the getOldValue call on Notification from the
> validationOccurred() method return null as opposed to old value?
>
>
> public void validationOccurred(ValidationEvent event) {
> for (Object target : event.getValidationTargets()) {
> if (target instanceof Notification) {
> Notification notification = (Notification) target;
> notification.getOldValue() // is always null
> notification.getNewValue() // return the new value

Ed Merks
Professional Support: https://www.macromodeling.com/

Report message to a moderator