[Velocity-user] Filters?

Sounds like something that the ReferenceInsertionEventHandler might be
able to do:

http://velocity.apache.org/engine/devel/developer-guide.html#Configuring_Event_Handlers
http://velocity.apache.org/engine/devel/apidocs/org/apache/velocity/app/event/ReferenceInsertionEventHandler.html
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Thanks, but that doesn't quite do what I need... it seems that it only
gets the value returned by the method call and has no reference to the
object the call was made on. For example, if my template has

$foo.bar

I just get the following:
"$foo.bar"
"Some string returned by method bar"

Is there any way to get a reference to $foo in this case and intercept
the result returned by getBar()?

Thanks,
James

-----Original Message-----
From: Nathan Bubna
Sent: Thursday, November 06, 2008 12:16 PM
To: Velocity Users List
Subject: Re: Filters?

Sounds like something that the ReferenceInsertionEventHandler might be
able to do:

http://velocity.apache.org/engine/devel/developer-guide.html#Configuring
_Event_Handlers
http://velocity.apache.org/engine/devel/apidocs/org/apache/velocity/app/
event/ReferenceInsertionEventHandler.html
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Ah. Well, if the result returned by getBar() is an object type under
your control, then with 1.6-beta2, you can have it implement this
interface:

http://velocity.apache.org/engine/devel/apidocs/org/apache/velocity/runtime/Renderable.html

which allows rendering that doesn't go through toString().

If the class of that is not under your control or you don't like the
above method, then you may be able to achieve your result via a custom
Uberspect implementation.

http://velocity.apache.org/engine/devel/apidocs/org/apache/velocity/util/introspection/Uberspect.html

The default setting in the velocity.properties is:

runtime.introspector.uberspect =
org.apache.velocity.util.introspection.UberspectImpl

the easiest thing is usually to replace that with a subclass of
UberspectImpl. and with 1.6-beta2, there is support for chaining and
linking Uberspects as well.

http://velocity.apache.org/engine/devel/apidocs/org/apache/velocity/util/introspection/ChainableUberspector.html

If you went the custom Uberspect route, then you should be able to
turn a getBar() call into something else.
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