Eric,
Cayenne 1.2 has some unadvertised object graph cloning facilities
centered around ClassDescriptor interface (that has a 'shallowMerge'
method). I've written a few specialized operations, such as
DeepMergeOperation and ObjectDetachOperation in Util package that are
doing smart deep copy for some internal use.
Could you explain a bit what is the purpose of the copy operation and
whether the original and cloned objects are (or should be) registered
with a DataContext and whether this is the same DataContext for the
original and the clone.
Andrus
On May 31, 2006, at 1:03 PM, Eric Lazarus wrote:
What are the best ways to copy an object that is
persisted by Cayenne? I'm an old-time smalltalk
programmer and like to write a copy and a postCopy
method where a shallowCopy method is called before
the postCopy method is called and shallowCopy just
calls clone.
Are there any tricks to do take into account when
doing a copy of a subclass of a cayenne DataObject?
Does the clone method perform a shallowCopy and give
me back something that will persist correctly? Do I
need to do something so that the clone will be known
to cayenne? Perhaps clone is not supported at all in
cayenne?
I see a mention of SnapShot but I dont know what that
is. I also see cloneViaSerialization but perhaps that
is just for use with internal data structures and not
my domain objects?
Thanks,
Eric
