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Posted to user@commons.apache.org by Your Name <ne...@tcs.com.ve> on 2004/12/08 19:53:41 UTC
JEXL Questions
Hi
I've been checking out JEXL and is very easy to use. I was wondering if
I can do the following things:
1.- Define an expression and then reuse that expression as a function.
I want to be able to let users configure their own expressions and then
reuse them in another expression. Something like this:
Function TRIANGLEAREA: (a * b) / 2.
Reuse the function: a + TRIANGLEAREA (a, b) + b.
2.- For a particular expression know what variables depend on the
expression. I want to be able to expose the expression as a function
with parameters.
Regards,
Nestor Boscan
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RE: JEXL Questions
Posted by Hans Gilde <hg...@earthlink.net>.
For (1), it sounds to me like you want to put the result of TRIANGLEAREA in
a variable in the JexlContext and pass that context into a second JEXL
expression?
For (2), you can't (well, you can, but not easily) find the variables in the
expression programmatically. However, if you know the variables a priori,
you can write a function that takes those variables and puts them into the
context. If you don't know them, you can just pass a Map of variables into
the context.
-----Original Message-----
From: Your Name [mailto:nestor.boscan@tcs.com.ve]
Sent: Wednesday, December 08, 2004 1:54 PM
To: commons-user@jakarta.apache.org
Subject: JEXL Questions
Hi
I've been checking out JEXL and is very easy to use. I was wondering if
I can do the following things:
1.- Define an expression and then reuse that expression as a function.
I want to be able to let users configure their own expressions and then
reuse them in another expression. Something like this:
Function TRIANGLEAREA: (a * b) / 2.
Reuse the function: a + TRIANGLEAREA (a, b) + b.
2.- For a particular expression know what variables depend on the
expression. I want to be able to expose the expression as a function
with parameters.
Regards,
Nestor Boscan
--
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