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 CosFunction extends AbstractFunction {

    public CosFunction() {

        super("Numeric", "COS", Range.is(1),

            "Returns the trigonometric cosine of an angle. Special cases:\n" +

            "- If the argument is NaN or an infinity, then the result is NaN.\n" +

            "The computed result must be within 1 ulp of the exact result. Results must be semi-monotonic.",

            "COS({{a}})",

            new String[]{

                "a - an angle, in radians."

            },

            "Double"

        );

    }

    @Override

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

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

        return r;

    }

}