Application: gvSIG desktop

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

import org.apache.commons.lang3.Range;

import org.gvsig.expressionevaluator.Interpreter;

import org.gvsig.expressionevaluator.spi.AbstractFunction;

public class SignFunction extends AbstractFunction {

    public SignFunction() {

        super("Numeric", "SIGN", Range.is(1));

    }

    @Override

    public boolean allowConstantFolding() {

        return true;

    }

    @Override

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

        Object value = args[0];

        if( value instanceof Float ) {

            float r = Math.signum(((Number) value).floatValue());

            return r;

        }

        double r = Math.signum(getDouble(args, 0));

        return r;

    }

}