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Fluent Java API for easier work with numbers, writing formula and calculations in Java.

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/*
 * Copyright 2014 Davor Sauer
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 
package org.jdice.calc.extension;

import org.jdice.calc.AbstractCalculator;
import org.jdice.calc.Function;
import org.jdice.calc.Num;

/**
 * 
 * @author Davor Sauer 
 *
 */
public class TanFunction implements Function {

    @Override
    public String getSymbol() {
        return "tan";
    }

    /**
     * TAN accept only one attribute tan(-1-)
     */
    @Override
    public int getFunctionAttributes() {
        return 1;
    }

    @Override
    public Num calc(AbstractCalculator calc, Num... values)  {
        double tan = Math.tan(values[0].toBigDecimal().doubleValue());

        return new Num(tan);
    }

}