Re: [rules-users] performing math function in drools
// appl.transport.Transport.java:
public class Transport {
public static double tax( double a, int n ){
return Math.pow( a, (double)n );
}
}
// transport.drl --------------------------------------------------
import function appl.transport.Transport.tax;
import function java.lang.Math.pow;
dialect "java"
function double sqr( double a ){
return Math.pow( a, 2.0 );
}
rule "demo"
when
Cargo( name == "Crate", , limit < ( tax( 20.0, 2 ) ) )
then
System.out.println( "tax=" + tax( 20.0, 2 ) );
System.out.println( "pow=" + pow( 20.0, 2.0 ) );
System.out.println( "sqr=" + sqr( 20.0 ) );
end
-W
2010/10/4 Kripa Nathwani <Kripa.Nathwani(a)lntinfotech.com>
But for using Math.pow() I have to import java.lang in that
function.
Even after importing java.lang, it is not recognizing the function add
giving me error as :
Prohibited package name:java.class
If you can just forward me the link for that document you mentioned below,
I can get some useful insight into it.
Best Regards,
Kripa
*From:* rules-users-bounces(a)lists.jboss.org [mailto:
rules-users-bounces(a)lists.jboss.org] *On Behalf Of *Leandro Romero
*Sent:* Monday, October 04, 2010 10:22 AM
*To:* Rules Users List
*Subject:* Re: [rules-users] performing math function in drools
If you want to make a function call in LHS you have to use Eval, it allows
you to execute any Java code. In this especific case, you can call
Math.pow() inside of it.
Before using it, I strongly recommend you to read the documentation about
it.
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