AbstractDms.java

package jscl.math.function;

import jscl.math.Generic;
import jscl.math.JsclInteger;
import jscl.mathml.MathML;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;

/**
 * User: serso
 * Date: 11/12/11
 * Time: 3:48 PM
 */
public abstract class AbstractDms extends Algebraic {

    protected AbstractDms(@Nonnull String name, Generic degrees, Generic minutes, Generic seconds) {
        super(name, new Generic[]{degrees, minutes, seconds});
    }

    @Nonnull
    private static Generic[] createParameters(@Nullable Generic degrees,
                                              @Nullable Generic minutes,
                                              @Nullable Generic seconds) {
        final Generic[] result = new Generic[3];

        setDefaultValue(result, degrees, 0);
        setDefaultValue(result, minutes, 1);
        setDefaultValue(result, seconds, 2);

        return result;
    }

    private static void setDefaultValue(@Nonnull Generic[] parameters,
                                        @Nullable Generic parameter,
                                        int position) {
        if (parameter == null) {
            parameters[position] = JsclInteger.valueOf(0);
        } else {
            parameters[position] = parameter;
        }
    }

    @Override
    public int getMaxParameters() {
        return 3;
    }

    @Override
    public void setParameters(@Nullable Generic[] parameters) {
        super.setParameters(createParameters(getParameter(parameters, 0), getParameter(parameters, 1), getParameter(parameters, 2)));
    }

    @Override
    public Root rootValue() throws NotRootException {
        throw new UnsupportedOperationException("Root for " + name + "() is not supported!");
    }

    @Override
    void bodyToMathML(MathML element, boolean fenced) {
        final MathML child = element.element(name);
        parameters[0].toMathML(child, null);
        // todo serso: add other parameters
        element.appendChild(child);
    }

    @Override
    public Generic selfExpand() {
        return expressionValue();
    }

    @Override
    public Generic selfElementary() {
        return selfExpand();
    }

    @Override
    public Generic selfSimplify() {
        return selfExpand();
    }

    @Override
    public Generic selfNumeric() {
        Generic degrees = parameters[0];

        if (parameters.length > 1 && parameters[1] != null) {
            Generic minutes = parameters[1];
            degrees = degrees.add(minutes.divide(JsclInteger.valueOf(60)));
        }

        if (parameters.length > 2 && parameters[2] != null) {
            Generic seconds = parameters[2];
            degrees = degrees.add(seconds.divide(JsclInteger.valueOf(60 * 60)));
        }

        return degrees;
    }

    @Override
    public Generic derivative(int n) {
        throw new UnsupportedOperationException("Derivative for " + name + "() is not supported!");
    }
}