Application: gvSIG desktop

package org.gvsig.expressionevaluator.impl.function.numeric;

import java.util.Random;

import org.apache.commons.lang3.Range;

import org.gvsig.expressionevaluator.Interpreter;

import org.gvsig.expressionevaluator.spi.AbstractFunction;

public class RandFunction extends AbstractFunction {

    private Random random;

    public RandFunction() {

        super("Numeric", "RAND", Range.between(0, 1));

        this.addAlias("RANDOM");        

    }

    @Override

    public Object call(Interpreter interpreter, Object[] args) {

        if( args.length == 1 ) {

            this.random = new Random(getLong(args, 1));

        }

        if( this.random == null ) {

            this.random = new Random();

        }

        return Math.random();

    }

}