Hi Ed,
As EObjects are
created by realized variable visit methods these objects
will all have no eContainer. Later when an owner ship (or
similar) association is set, the EObejct gets an eContainer.
However, the top level elements (e.g. the PacakgeToSchema
and Schema EObjects) will remain without a container. There
is also the case where this type of _expression_ may be
visited before the owner attribute is set, which should not
generate an exception (in my opinion).
Regards,
Hi
It is generally a bad idea to have EObjects without an
eContainer, since eContainer provides the navigation route to
Resources and ResourceSets where many useful services are
provided.
If you have an object without a container that needs
investigating.
Regards
Ed
On 05/08/2013 15:17, Horacio Hoyos Rodriguez wrote:
Hi Ed,
After adding a
catch _expression_ for Invalid values while evaluation
initializer expressions I realized that both the middle model
and the output model where not being generated properly.
I noticed some
errors in the RDBMS metamodel and after fixing and doing some
more tests I was able to fix another couple of bugs in the
evaluation visitor which caused strange bindings in the middle
model.
After fixing
this I am now getting another exception, which I think is an
OCL issue.
In the UML2RDBMS
QVTi transformation, line 356 we have:
fc.type :=
rk.column->first().type;
which was giving: InvalidValueException: 'Sequence' rather
than 'OclVoid' value required
After debugging
the evaluation if the OCL _expression_ I found that when
visiting the rk.column _expression_, there is a method to get
the value of the property (column of rk).
This method
invokes evaluate method in CompoistionProperty.java, in line
45 the eContainer of the variable is fetched, and in this case
the container is null (the key has not yet been assigned an
owner?). Then the method returns null (line 46: if (eContainer
== null) { return null } )
and then back in
visitOperationCallExp the sourceValue variable will be set to
null, and hence I get a the exception.
Why is the need
for the container not to be null and why if it is null the
value of the variable is returned as null?
Regards,
Horacio Hoyos Rodríguez
EngD Student
University of
York
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