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 ACosFunction extends AbstractFunction {

    public ACosFunction() {

        super(

            "Numeric", "ACOS", Range.is(1),

            "Returns the arc cosine of a value; the returned angle is in the range 0.0 through pi.",

            "ACOS({{a}})",

            new String[]{

                "value whose arc tangent is to be returned"

            },

            "Double",

            true

        );

    }

    @Override

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

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

        return r;

    }

}