That's what I thought from looking at the source, I'm working on a similar
bit for handling exceptions in my transaction framework, attached is the
current code I'm working on to handle parent/child/grandchild inheritance,
not fully tested.
Jacob
-----Original Message-----
From: David Graham [mailto:[EMAIL PROTECTED]
Sent: Tuesday, July 15, 2003 12:37 PM
To: Struts Users Mailing List
Subject: Re: [Error Handlers] instanceof ?
--- "Hookom, Jacob" <[EMAIL PROTECTED]> wrote:
> Off hand, would Struts be able to catch the exception with this desired
> handler?
>
> Action throws ServiceNotFoundException
> ExceptionHandler catches ServiceException
>
> Where ServiceNotFoundException is an instance of ServiceException?
Not currently. I was thinking about improving the ExceptionHandler to
support that just today :-). It would be nice if the ExceptionHandler
acted like a global try/catch block with the same inheritance rules.
David
>
> Thanks,
> Jacob
>
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protected Map handledExceptions;
protected Collection unhandledExceptions;
public TaskKey findExceptionHandler(Class exceptionType)
{
TaskKey key = (TaskKey) this.handledExceptions.get(exceptionType);
if (key == null && !unhandledExceptions.contains(exceptionType))
{
synchronized (this.handledExceptions)
{
Class parent = null;
Class closestParent = null;
for (Iterator itr = this.handledExceptions.keySet().iterator();
itr.hasNext();
)
{
parent = (Class) itr.next();
if (parent.isAssignableFrom(exceptionType))
{
if (closestParent == null ||
closestParent.isAssignableFrom(parent))
{
closestParent = parent;
}
}
}
if (closestParent != null)
{
key = (TaskKey)
this.handledExceptions.get(closestParent);
this.handledExceptions.put(exceptionType, key);
}
else
{
this.unhandledExceptions.add(exceptionType);
}
parent = null;
closestParent = null;
}
}
return key;
}
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