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
Assigned to: Rich Feit
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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