Adjust speed to render object with something other than toString?
Is there a way to configure Velocity to use something other than toString () to convert an object to a string in the template? For example, suppose I am using a simple date class with the format () method and I use the same format every time. If all my speed code looks like this:
$someDate.format('M-D-yyyy')
is there some configuration I could add that would allow me to just say
$someDate
instead of this? (Assuming I'm not able to just edit the date class and assign toString () to it).
I am doing this in the context of a webapp created with WebWork, if that helps.
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Velocity lets you use a JSTL utility called speedimacros:
http://velocity.apache.org/engine/devel/user-guide.html#Velocimacros
This will allow you to define the macro as:
#macro( d $date)
$date.format('M-D-yyyy')
#end
And then call it like this:
#d($someDate)
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Oh, and the 1.6+ versions of Velocity have a new Renderable interface. If you don't mind binding your date class to the Velocity API, then implement this interface and Velocity will use the render method (context, write) (for your case, you just ignore the context and use the author) instead of toString ().
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I ran into this problem too and I was able to solve it based on Nathan Bubna's answer .
I am just trying to follow through on the answer by providing a link for the Velocity documentation that explains how to use EventHandlers.
In my case, I need Velocity to call "getAsString" instead of the toString method on all JsonPrimitive objects from the gson library every time a link was inserted.
It was as easy as creating
public class JsonPrimitiveReferenceInsertionEventHandler implements ReferenceInsertionEventHandler{
/* (non-Javadoc)
* @see org.apache.velocity.app.event.ReferenceInsertionEventHandler#referenceInsert(java.lang.String, java.lang.Object)
*/
@Override
public Object referenceInsert(String reference, Object value) {
if (value != null && value instanceof JsonPrimitive){
return ((JsonPrimitive)value).getAsString();
}
return value;
}
}
And add event to VelocityContext
vec = new EventCartridge();
vec.addEventHandler(new JsonPrimitiveReferenceInsertionEventHandler());
...
context.attachEventCartridge(vec);
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