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Compilation error with Eclipse 3.5 and EMF 2.5 [message #481559]

Fri, 21 August 2009 14:35

Eclipse User

Originally posted by: mluchian.interpro.qc.ca

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
</head>
<body bgcolor="#ffffff" text="#000000">
Hello, 
 
I recently updated to Eclipse 3.5 and EMF 2.5 and I have the following
problem when getting EMF attributes in a panel. This problem was not
present in EMF 2.4. 
 
My code is the following: 
 
        for (Iterator<IItemPropertyDescriptor> i =
detailPropertyDescriptors.iterator(); i.hasNext();) 
        { 
            final IItemPropertyDescriptor desc =
(IItemPropertyDescriptor) i.next(); 
            EObjectImpl dataHolderObject = (EObjectImpl)
desc.getFeature(input); 
            Object dataValue = ((EObjectImpl)
adapterFactoryItemDelegator.getEditableValue(input)).eGet((E StructuralFeature)
dataHolderObject); 
 
 
            if (((EAttributeImpl) dataHolderObject).getName().equals("name" ))     &nbs p;     &nbs p;   
 
            { 
                
             } 
        }  
 
I get a compilation error in the underlined code saying "Cannot cast
from EObjectImpl to EAttributeImpl", so my conlusion is that the EMF
API has changed. How could I fix my problem, as I need to get all
attributes in the implemented EMF object and test whether the attribute
is a "name", etc, etc. 
 
Thanks, 
 
Mircea 
</body>
</html>

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Re: Compilation error with Eclipse 3.5 and EMF 2.5 [message #481570 is a reply to message #481559]

Fri, 21 August 2009 15:30

Ed Merks

Messages: 33137
Registered: July 2009

Senior Member

This is a multi-part message in MIME format.
--------------080002010207060106030302
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit

Mircea,

Comments below.

M. Luchian wrote:
> Hello,
>
> I recently updated to Eclipse 3.5 and EMF 2.5 and I have the following
> problem when getting EMF attributes in a panel. This problem was not
> present in EMF 2.4.
>
> My code is the following:
>
> for (Iterator<IItemPropertyDescriptor> i =
> detailPropertyDescriptors.iterator(); i.hasNext();)
> {
> final IItemPropertyDescriptor desc =
> (IItemPropertyDescriptor) i.next();
> EObjectImpl dataHolderObject = (EObjectImpl)
> desc.getFeature(input);
Why case cast to an Impl class? You should cast to EObject or
InternalEObject not to one of the specific Impl classes.
> Object dataValue = ((EObjectImpl)
> adapterFactoryItemDelegator.getEditableValue(input)).eGet((E StructuralFeature)
> dataHolderObject);
>
>
> if (_((EAttributeImpl)
> dataHolderObject)_.getName().equals("name"))
Again, why cast to an Impl? Why not to EAttribute? I see this so
often, and I ask people why they do this yet no one has ever explained
why...
>
> {
>
> }
> }
>
> I get a compilation error in the underlined code saying "Cannot cast
> from EObjectImpl to EAttributeImpl", so my conlusion is that the EMF
> API has changed.
No, in the implementation changed and you've been relying on
implementation details. Don't do that. Delete the bogus "Impl" parts
of your code above?
> How could I fix my problem, as I need to get all attributes in the
> implemented EMF object and test whether the attribute is a "name",
> etc, etc.
>
> Thanks,
>
> Mircea

--------------080002010207060106030302
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta content="text/html;charset=ISO-8859-1" http-equiv="Content-Type">
</head>
<body bgcolor="#ffffff" text="#000000">
Mircea, 
 
Comments below. 
 
 
M. Luchian wrote:
<blockquote cite="mid:h6mbb4$ha3$1@build.eclipse.org" type="cite">Hello,
 
 
I recently updated to Eclipse 3.5 and EMF 2.5 and I have the following
problem when getting EMF attributes in a panel. This problem was not
present in EMF 2.4. 
 
My code is the following: 
 
        for (Iterator<IItemPropertyDescriptor> i =
detailPropertyDescriptors.iterator(); i.hasNext();) 
        { 
            final IItemPropertyDescriptor desc =
(IItemPropertyDescriptor) i.next(); 
            EObjectImpl dataHolderObject = (EObjectImpl)
desc.getFeature(input); 
</blockquote>
Why case cast to an Impl class?  You should cast to EObject or
InternalEObject not to one of the specific Impl classes. 
<blockquote cite="mid:h6mbb4$ha3$1@build.eclipse.org" type="cite">   
        Object dataValue = ((EObjectImpl)
adapterFactoryItemDelegator.getEditableValue(input)).eGet((E StructuralFeature)
dataHolderObject); 
 
 
            if (((EAttributeImpl) dataHolderObject).getName().equals("name" ))     &nbs p;   
 
</blockquote>
Again, why cast to an Impl?  Why not to EAttribute?  I see this so
often, and I ask people why they do this yet no one has ever explained
why... 
<blockquote cite="mid:h6mbb4$ha3$1@build.eclipse.org" type="cite">     
 
            { 
                
             } 
        }  
 
I get a compilation error in the underlined code saying "Cannot cast
from EObjectImpl to EAttributeImpl", so my conlusion is that the EMF
API has changed. </blockquote>
No, in the implementation changed and you've been relying on
implementation details.  Don't do that.  Delete the bogus "Impl" parts
of your code above? 
<blockquote cite="mid:h6mbb4$ha3$1@build.eclipse.org" type="cite">How
could I fix my problem, as I need to get all
attributes in the implemented EMF object and test whether the attribute
is a "name", etc, etc. 
 
Thanks, 
 
Mircea 
</blockquote>
</body>
</html>

--------------080002010207060106030302--

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

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Re: Compilation error with Eclipse 3.5 and EMF 2.5 [message #481600 is a reply to message #481570]

Fri, 21 August 2009 17:23

Eclipse User

Originally posted by: mluchian.interpro.qc.ca

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta content="text/html;charset=ISO-8859-1" http-equiv="Content-Type">
</head>
<body bgcolor="#ffffff" text="#000000">
Thanks Ed, 
It was my mistake. I made the changes and everything compiles now. 
Mircea 
 
Ed Merks wrote:
<blockquote cite="mid:h6mejg$sdm$1@build.eclipse.org" type="cite">
<meta content="text/html;charset=ISO-8859-1" http-equiv="Content-Type">
Mircea, 
 
Comments below. 
 
 
M. Luchian wrote:
<blockquote cite="mid:h6mbb4$ha3$1@build.eclipse.org" type="cite">Hello,
 
 
I recently updated to Eclipse 3.5 and EMF 2.5 and I have the following
problem when getting EMF attributes in a panel. This problem was not
present in EMF 2.4. 
 
My code is the following: 
 
        for (Iterator<IItemPropertyDescriptor> i =
detailPropertyDescriptors.iterator(); i.hasNext();) 
        { 
            final IItemPropertyDescriptor desc =
(IItemPropertyDescriptor) i.next(); 
            EObjectImpl dataHolderObject = (EObjectImpl)
desc.getFeature(input); 
</blockquote>
Why case cast to an Impl class?  You should cast to EObject or
InternalEObject not to one of the specific Impl classes. 
<blockquote cite="mid:h6mbb4$ha3$1@build.eclipse.org" type="cite">   
        Object dataValue = ((EObjectImpl)
adapterFactoryItemDelegator.getEditableValue(input)).eGet((E StructuralFeature)
dataHolderObject); 
 
 
            if (((EAttributeImpl) dataHolderObject).getName().equals("name" ))     &nbs p;   
 
</blockquote>
Again, why cast to an Impl?  Why not to EAttribute?  I see this so
often, and I ask people why they do this yet no one has ever explained
why... 
<blockquote cite="mid:h6mbb4$ha3$1@build.eclipse.org" type="cite">     
 
            { 
                
             } 
        }  
 
I get a compilation error in the underlined code saying "Cannot cast
from EObjectImpl to EAttributeImpl", so my conlusion is that the EMF
API has changed. </blockquote>
No, in the implementation changed and you've been relying on
implementation details.  Don't do that.  Delete the bogus "Impl" parts
of your code above? 
<blockquote cite="mid:h6mbb4$ha3$1@build.eclipse.org" type="cite">How
could I fix my problem, as I need to get all
attributes in the implemented EMF object and test whether the attribute
is a "name", etc, etc. 
 
Thanks, 
 
Mircea 
</blockquote>
</blockquote>
 
</body>
</html>

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