This would be optional, the current way would still be supported.
Do you have a better solution to add constraints to existing POJOs
that can't or shouldn't be modified?
On 30-okt-05, at 16:50, Keith Lea wrote:
I think requiring 2 classes for each bean sucks. I know it won't be
required, but I think even allowing you to do it this way is
encouraging complicated, verbose, hard to maintain code.
On Oct 30, 2005, at 3:47 AM, Geert Bevin wrote:
Hi everyone,
currently, the persistence engine requires your POJOs to implement
the Constrained and Validated interface, which can be quite a
burden if you don't extend the CmfValidation or Validation base
classes. I was thus thinking of adding support for declaring all
the meta-data in an external parallel class.
So if your POJO is named like this:
com.mypakkage.ThisPojo
RIFE would look for:
com.mypakkage.ThisPojoMetaData
If this class exists and implements the required interface, it
will be instantiated for each instance of ThisPojo that is
inspected for meta-data.
Sadly this is not as simple as it sounds, since RIFE's validation
is state-full. It has been designed to stick around as a collector
for all validation errors that can appear in any possible layer,
until the errors are explicitly cleared. To make this possible, I
should add a registry (WeakHashMap) that keeps track of each
ThisPojo instance and the associated ThisPojoMetaData instance.
The most logical location to add this would be an additional
Participant. However, since this is such a fundamental core
feature, it seems awkward to require everybody to add this
participant explicitly. It would this always be added by default
to the standard Repository implementation (maybe even to the
custom ones). Another option would be to just have a static map in
ConstrainedUtils, but that feels very dirty.
What do you think of all this? Do you think it is worth the
effort? Any better ideas to preserve the instance and meta-data
mapping?
Thanks for you input,
Geert
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Geert Bevin Uwyn bvba
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Geert Bevin Uwyn bvba
"Use what you need" Avenue de Scailmont 34
http://www.uwyn.com 7170 Manage, Belgium
gbevin[remove] at uwyn dot com Tel +32 64 84 80 03
PGP Fingerprint : 4E21 6399 CD9E A384 6619 719A C8F4 D40D 309F D6A9
Public PGP key : available at servers pgp.mit.edu, wwwkeys.pgp.net
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