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From "Julie Zhuo (JIRA)" <beehive-...@incubator.apache.org>
Subject [jira] Closed: (BEEHIVE-41) Cannot use an interface as the form bean for an action
Date Fri, 13 May 2005 21:50:06 GMT
     [ http://issues.apache.org/jira/browse/BEEHIVE-41?page=all ]
     
Julie Zhuo closed BEEHIVE-41:
-----------------------------


Verified fixed at rev170022.

> Cannot use an interface as the form bean for an action
> ------------------------------------------------------
>
>          Key: BEEHIVE-41
>          URL: http://issues.apache.org/jira/browse/BEEHIVE-41
>      Project: Beehive
>         Type: Improvement
>   Components: NetUI
>     Versions: V1Alpha
>     Reporter: Rich Feit
>     Assignee: Julie Zhuo
>      Fix For: V1Beta

>
> This deals with returning data from nested page flows, in the case where multiple nested
page flows may return to the same calling page flow.
> Consider the scenario where you have a generic calling page flow that can forward to
any number of nested page flows, and where each of the nested page flows conforms to an 'interface'
of returnActions.  When the nested page flow returns, you may want to specify an interface
type or base class type in the action method on the calling page flow, so the nested page
flow can return an implementation/extension of the type.  Currently, the exact types of the
returned bean and the handler action's bean must match.
> Here's an example of what I'm talking about:
> generic interface for returning data:
> -------------------------------------
> public interface DataReturn
> {
>     ...
> }
> calling page flow:
> ------------------
> @Jpf.Controller
> public class CallingController extends PageFlowController
> {
>     @Jpf.Action
>     public Forward goNested()
>     {
>         URI uri = lookupNestedPageFlowURI();   // user code to determine the nested page
flow URI dynamically
>         Object inputBean = ...;
>         return new Forward( uri, inputBean );
>     }
>     @Jpf.Action( ... )
>     public Forward nestedDone( DataReturn dataReturn )
>     {
>         ...
>     }
>     ...
> }
> a nested page flow:
> -------------------
> @Jpf.Controller
> public class Nested extends PageFlowController
> {
>     private static class MyDataReturn implements DataReturn
>     {
>         ...
>     }
>     @Jpf.Action(
>         forwards={
>             @Jpf.Forward(name="exit", returnAction="nestedDone")
>         }
>     )
>     public Forward done()
>     {
>         return new Forward( "exit", new MyDataReturn( ... ) );
>     }
> }

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