Using Math. functions

[dranakan]

Hello,

I would to use the absolute value (Math.abs) in my worklow. I have written like this :

<sequenceFlow id="flow9" name="" sourceRef="exclusivegateway3" targetRef="modifyReviewBoss1">
      <conditionExpression xsi:type="tFormalExpression"><![CDATA[${sgfwf_approveRejectOutcome == 'Approve' && sgfwf_amount  > Math.abs(sgfwf_condition1) } ]]></conditionExpression>
    </sequenceFlow>
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But I get this :

 2012-02-27 07:57:28,551  DEBUG [repo.jscript.ScriptLogger] [http-8080-22] org.activiti.engine.ActivitiException: Unknown property used in expression
‍‍

How can I use Math.X functions ?

Thank you.

(post on activiti forum : http://forums.activiti.org/en/viewtopic.php?f=4&t=3539)

[dranakan]

Thank you Lukasz for the response.

1. Create a java class as a wrapper for functions from Math class, for example:

package ch.custom.workflowUtils;

public class MathUtils {
    
    public int abs(int a) {
        return Math.abs(a);
    }
…
}
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2. Register this class as a Spring bean, for example:

<bean id="mathUtils" class="ch.custom.workflowUtils.MathUtils" />‍

3. Add mathUtils bean to activitiBeanRegistry, for example:

<util:map id="activitiBeanRegistry" map-class="java.util.HashMap">
   <entry key="services" value-ref="ServiceRegistry" />
   <entry key="mathUtils" value-ref="mathUtils" />
</util:map>
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4. Use mathUtils bean in expression, for example:

<conditionExpression xsi:type="tFormalExpression">${wf_actualPercent >= mathUtils.abs(1)}</conditionExpression>‍