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EcoreUtil.equals is not returning the value properly [message #1699335]

Tue, 23 June 2015 09:20

Eclipse User

Hi All,

As far as I know EcoreUtil.equals(eObj1,eObj2) checks for data equality but not references.

Say that I have an Eobject with data :

node MyNode {

description "Hello"
refers OtherNode
}

OtherNode is also an object like MyNode defined above.

I have two eobjects holding the same data for MyNode and ECoreUtil.equals works properly.

Now I have a variation.

The OtherNode doesn't exist and it gives me a couldn't resolve error in the editor.

But say that still I have defined MyNode in the same way and at this time ECoreUtil.equals returns false.

Can someone help me how can I solve this now ? Is overriding equals method is the only way ?

Thanks in advance Smile

Re: EcoreUtil.equals is not returning the value properly [message #1699338 is a reply to message #1699335]

Tue, 23 June 2015 09:31

Eclipse User

Arshad,

Comments below.

On 23/06/2015 3:20 PM, Arshad Adavani wrote:
> Hi All,
>
> As far as I know EcoreUtil.equals(eObj1,eObj2) checks for data
> equality but not references.
No, it does a deep comparison that includes navigating and comparing the
objects reachable via containment and cross references.
>
> Say that I have an Eobject with data :
>
> node MyNode {
>
> description "Hello"
> refers OtherNode }
>
> OtherNode is also an object like MyNode defined above.
>
> I have two eobjects holding the same data for MyNode and
> ECoreUtil.equals works properly.
>
>
> Now I have a variation.
>
> The OtherNode doesn't exist and it gives me a couldn't resolve error
> in the editor.
So it's a broken cross reference, i.e., one that fails to resolve.
>
> But say that still I have defined MyNode in the same way and at this
> time ECoreUtil.equals returns false.
And both instances have the same broken cross reference?
>
> Can someone help me how can I solve this now ? Is overriding equals
> method is the only way ?
If the default implementation doesn't do what you want, you'd have to
specialize it to implement your own notion of structural equality.
>
>
>
> Thanks in advance :)

Re: EcoreUtil.equals is not returning the value properly [message #1699340 is a reply to message #1699338]

Tue, 23 June 2015 09:37

Eclipse User

Hi Ed,

Thanks for your reply.

Yes, both instances have the same broken cross reference.
And still it returns me false. Any idea why ?

Regards,
Arshad

Re: EcoreUtil.equals is not returning the value properly [message #1699344 is a reply to message #1699340]

Tue, 23 June 2015 09:46

Eclipse User

Arshad,

A debugger can answer this question better than I can theorize about the
extract structure of your specific test scenario.

On 23/06/2015 3:37 PM, Arshad Adavani wrote:
> Hi Ed,
>
> Thanks for your reply.
>
> Yes, both instances have the same broken cross reference.
> And still it returns me false. Any idea why ?
>
>
> Regards,
> Arshad

Re: EcoreUtil.equals is not returning the value properly [message #1699351 is a reply to message #1699344]

Tue, 23 June 2015 10:07

Eclipse User

Hi Ed,

I resolved both the objects before comparison and after that it works quite well... Smile

Regards,
Arshad

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