Way to specify the start event(s) in a wizard so that stripes to make it easier
to start wizard flows
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Key: STS-236
URL: http://mc4j.org/jira/browse/STS-236
Project: Stripes
Issue Type: Improvement
Components: ActionBean Dispatching
Reporter: Tim Fennell
Assigned To: Tim Fennell
Fix For: Release 1.4
>> From email by Dave Pascal on the Stripes Users List >>
We have been using Stripes for a recent project and had a use case
implementation that fit using a Wizard perfectly. We found out quickly that
unless a varible with the name "_pf" is present, the wizard throws an exception,
which is a problem when you try to render the first panel of the wizard, uless
you spoof the URL to include the variable (too klugy). Since you cannot extend
annotations, we created a new annotation that contains a list of events which
indicate which events are the begining of the wizard. We hooked this into the
property binder to ignore the fields present check so that the first panel of
the wizard would display. I recommend enhacing the Wizard annotation to do this
so that the default binder configuraed with Stripes
(OgnlActionBeanPropertyBinder) can see if the event in the ActionBeanContext is
one of the events listed in the Wizard tag in order to ignore the fields present
check. We made it a class level annotation to keep it simple, but in reality it
should be a marker annotation at the method level.
Here is our implementation:
@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
public @interface WizardStartEvent {
String[] events = {};
public String[] events();
}
_________________________________________
@Override
protected Collection<String> getFieldsPresentInfo(ActionBean bean) {
if (bean.getClass().getAnnotation(Wizard.class) != null) {
String currentEvent = bean.getContext().getEventName();
WizardStartEvent annotation =
bean.getClass().getAnnotation(WizardStartEvent.class);
String[] events = annotation.events();
for (String event : events) {
if (currentEvent.equals(event)) {
return Collections.emptySet();
}
}
}
return super.getFieldsPresentInfo(bean);
}
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