In Stripes 1.5.1, there will be a new ObjectFactory interface and
DefaultObjectFactory implementation. You can extend DOF's
getImplementingClass(Class<?> iface) method to return the class you want to
instantiate for a given interface.
-Ben
On Sun, Feb 22, 2009 at 5:05 PM, otismo <[email protected]> wrote:
>
> What's the cleanest way to handle this situation?
>
> I've got nested business objects that implement interfaces so the client is
> never privy to the concrete classes. Of course when I try to use Stripes
> default instantiation, it complains (see message below) because it sees the
> interface and doesn't know what type of concrete class to implement.
>
> >From ReflectUtil.getInterfaceInstance()
> "Stripes needed to instantiate a property who's declared type as an " +
> "interface (which obviously cannot be instantiated. The
> interface is not " +
> "one that Stripes is aware of, so no implementing class
> was known. The " +
> "interface type was: '" + interfaceType.getName() + "'.
> To fix this " +
> "you'll need to do one of three things. 1) Change the
> getter/setter methods " +
> "to use a concrete type so that Stripes can instantiate
> it. 2) in the bean's " +
> "setContext() method pre-instantiate the property so
> Stripes doesn't have to. " +
> "3) Bug the Stripes author ;) If the interface is a JDK
> type it can easily be " +
> "fixed. If not, if enough people ask, a generic way to
> handle the problem " +
> "might get implemented.");
>
> It would be great if there were a way to specify a mapping for an interface
> to an instantiator so that I could define a method to handle the
> instantiation.
>
> Is there a way to do that? I got the impression from the message above
> that
> there was not.
>
> Barring that, I could try to pre-instantiate the concrete class as
> suggested
> in the message above, but I'm not sure the best way to do that. Should I
> set up a @Before binding with a handler that iterates through all the
> request parameters and pre-instantiates based on those? That seems a
> little
> clunky.
>
> So basically, this is my situation:
>
> In the .jsp:
> <s:text name="snapshot.goals.dietGoals[${loop.index}].text" />
>
> snapshot.getGoals().getDietGoals() returns a List<Goal>. Goal is an
> interface. snapshot.getGoals() returns a Goals interface which has a
> method, Goal getDietGoal(String text), which returns an instance of a Goal.
>
> I really just want to tell Stripes to use goals.getDietGoal(text) to
> instantiate my type.
>
> Is there a good way to do that?
>
> Thanks,
> Peter
> --
> View this message in context:
> http://www.nabble.com/preinstantiate-interface-type-tp22152219p22152219.html
> Sent from the stripes-users mailing list archive at Nabble.com.
>
>
>
> ------------------------------------------------------------------------------
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-OSBC tackles the biggest issue in open source: Open Sourcing the Enterprise
-Strategies to boost innovation and cut costs with open source participation
-Receive a $600 discount off the registration fee with the source code: SFAD
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