src/main/java/org/geojson/LngLatAlt.java

package org.geojson;

import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
import com.fasterxml.jackson.databind.annotation.JsonSerialize;
import org.geojson.jackson.LngLatAltDeserializer;
import org.geojson.jackson.LngLatAltSerializer;

import java.io.Serializable;
import java.util.Arrays;

@JsonDeserialize(using = LngLatAltDeserializer.class)
@JsonSerialize(using = LngLatAltSerializer.class)
public class LngLatAlt implements Serializable{

	private double longitude;
	private double latitude;
	private double altitude = Double.NaN;
	private double[] additionalElements = new double[0];

	public LngLatAlt() {
	}

	public LngLatAlt(double longitude, double latitude) {
		this.longitude = longitude;
		this.latitude = latitude;
	}

	public LngLatAlt(double longitude, double latitude, double altitude) {
		this.longitude = longitude;
		this.latitude = latitude;
		this.altitude = altitude;
	}

	/**
	 * Construct a LngLatAlt with additional elements.
	 * The specification allows for any number of additional elements in a position, after lng, lat, alt.
	 * http://geojson.org/geojson-spec.html#positions
	 * @param longitude The longitude.
	 * @param latitude The latitude.
	 * @param altitude The altitude.
	 * @param additionalElements The additional elements.
     */
	public LngLatAlt(double longitude, double latitude, double altitude, double... additionalElements) {
		this.longitude = longitude;
		this.latitude = latitude;
		this.altitude = altitude;

		setAdditionalElements(additionalElements);
		checkAltitudeAndAdditionalElements();
	}

	public boolean hasAltitude() {
		return !Double.isNaN(altitude);
	}

	public boolean hasAdditionalElements() {
		return additionalElements.length > 0;
	}

	public double getLongitude() {
		return longitude;
	}

	public void setLongitude(double longitude) {
		this.longitude = longitude;
	}

	public double getLatitude() {
		return latitude;
	}

	public void setLatitude(double latitude) {
		this.latitude = latitude;
	}

	public double getAltitude() {
		return altitude;
	}

	public void setAltitude(double altitude) {
		this.altitude = altitude;
		checkAltitudeAndAdditionalElements();
	}

	public double[] getAdditionalElements() {
		return additionalElements;
	}

	public void setAdditionalElements(double... additionalElements) {
		if (additionalElements != null) {
			this.additionalElements = additionalElements;
		} else {
			this.additionalElements = new double[0];
		}

		for(double element : this.additionalElements) {
			if (Double.isNaN(element)) {
				throw new IllegalArgumentException("No additional elements may be NaN.");
			}
			if (Double.isInfinite(element)) {
				throw new IllegalArgumentException("No additional elements may be infinite.");
			}
		}

		checkAltitudeAndAdditionalElements();
	}

	@Override
	public boolean equals(Object o) {
		if (this == o) {
			return true;
		}
		if (!(o instanceof LngLatAlt)) {
			return false;
		}
		LngLatAlt lngLatAlt = (LngLatAlt)o;
		return Double.compare(lngLatAlt.latitude, latitude) == 0 && Double.compare(lngLatAlt.longitude, longitude) == 0
				&& Double.compare(lngLatAlt.altitude, altitude) == 0 &&
				Arrays.equals(lngLatAlt.getAdditionalElements(), additionalElements);
	}

	@Override
	public int hashCode() {
		long temp = Double.doubleToLongBits(longitude);
		int result = (int)(temp ^ (temp >>> 32));
		temp = Double.doubleToLongBits(latitude);
		result = 31 * result + (int)(temp ^ (temp >>> 32));
		temp = Double.doubleToLongBits(altitude);
		result = 31 * result + (int)(temp ^ (temp >>> 32));
		for(double element : additionalElements) {
			temp = Double.doubleToLongBits(element);
			result = 31 * result + (int) (temp ^ (temp >>> 32));
		}
		return result;
	}

	@Override
	public String toString() {
		String s =  "LngLatAlt{" + "longitude=" + longitude + ", latitude=" + latitude + ", altitude=" + altitude;

		if (hasAdditionalElements()) {
			s += ", additionalElements=[";

			String suffix = "";
			for (Double element : additionalElements) {
				if (element != null) {
					s += suffix + element;
					suffix = ", ";
				}
			}
			s += ']';
		}

		s += '}';

		return s;
	}

	private void checkAltitudeAndAdditionalElements() {
		if (!hasAltitude() && hasAdditionalElements()) {
			throw new IllegalArgumentException("Additional Elements are only valid if Altitude is also provided.");
		}
	}
}