// 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@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@lists.jboss.org [mailto:rules-users-bounces@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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