/**
 * Copyright 2010-2013 Jingjing Li.
 *
 * This file is part of jplot2d.
 *
 * jplot2d is free software: you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or any later version.
 *
 * jplot2d is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Lesser Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with jplot2d. If not, see .
 */
package org.jplot2d.axtick;

/**
 * This class represent a number in degree minute second format
 * 
 * @author Jingjing Li
 */
public final class ArcDmsInterval implements DoubleInterval {

	public enum Unit {
		SECOND(1.0 / 3600), MINUTE(1.0 / 60), DEGREE(1);

		public final double angle;

		private Unit(double angle) {
			this.angle = angle;
		}
	};

	private final int _c, _e;

	private final Unit _unit;

	public ArcDmsInterval(int coefficient, int exponent) {
		_unit = Unit.SECOND;
		_c = coefficient;
		_e = exponent;
	}

	public ArcDmsInterval(Unit unit, int value) {
		_unit = unit;
		_c = value;
		_e = 0;
	}

	public Unit getUnit() {
		return _unit;
	}

	/**
	 * @return the coefficient
	 */
	public int getCoefficient() {
		return _c;
	}

	/**
	 * @return the exponent
	 */
	public int getExponent() {
		return _e;
	}

	public double doubleValue() {
		return Math.pow(10, _e) * _c * _unit.angle;
	}

	public boolean equals(Object obj) {
		if (!(obj instanceof ArcDmsInterval)) {
			return false;
		}
		ArcDmsInterval ien = (ArcDmsInterval) obj;
		return _c == ien._c && _e == ien._e;
	}

	public int hashCode() {
		return _c ^ (_e << 16);
	}

	public String toString() {
		return _c + "e" + _e;
	}
}