Hi,
I am wondering if there is any documentation on writing your own Utility
Class or Custom Tool to add to Velocity. The only place I found some help is
http://www.sergiy.ca/how-to-create-custom-tools-for-apache-velocity/ (There is
something regarding Custom Tools at
http://velocity.apache.org/tools/releases/2.0/creatingtools.html - but I
could not find anything regarding Utility Classes that we can push into the
Velocity Context.)
Originally, I was thinking of doing my processing/customization in
Velocimacros, but that is turning out to be a bit more complex/cumbersome than
I expected. I am thinking of doing this in Java, and pushing the results to the
Velocity Context as a single object/utility class instance. For purposes of
discussion let us assume, I do something like the following in Java:
VelocityContext context;
context.put("myUtil", new MyUtil());
I'd appreciate if I could get answers/ideas on:
1. I am wondering if MyUtil() needs to be static across requests. I intend
MyUtil() to provide easy access and manipulation of the current request. Hence,
I would probably do something like the following in Java:
context.put("myUtil", new MyUtil(currentWebRequest));
i.e. I would instantiate MyUtil with the current Web Request. MyUtil could
then provide easy access to say the Number of Rows in the Request. So in the
Template I could do:
$myUtil.NumRows
If MyUtil() is static, this would not work, because different requests would
have different number of Rows. Should the Utility Class/Object be static? The
example mentioned above shows only static methods, hence my question.
2. Should my Utility class follow the bean syntax i.e. for the above example
of $myUtil.NumRows in the template, would I need to declare something like the
following in the MyUtil Java class:
public int getNumRows() { }
3. What would be a good way to pass a Constant from Java to the Template?
Should I use the bean syntax again? E.g. in the template
$myUtil.JAVA_CONSTANT
Would I need to have something like:
public int getJAVA_CONSTANT () { }
Thank you in advance for your help,
O. O.
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