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Java SWT/JFace Utility Library including a Preferences Framework, Lightweight HTTP Server and macOS support.
There is a newer version: 20.1.0
package io.github.albertus82.jface.maps;

import java.io.Serializable;

public class MapBounds implements Serializable {

	private static final long serialVersionUID = -3330484387877221810L;

	public static final int LATITUDE_MIN_VALUE = -90;
	public static final int LATITUDE_MAX_VALUE = 90;
	public static final int LONGITUDE_MIN_VALUE = -180;
	public static final int LONGITUDE_MAX_VALUE = 180;

	private final Double northEastLat;
	private final Double southWestLat;
	private final Double northEastLng;
	private final Double southWestLng;

	public MapBounds() {
		this(null, null, null, null);
	}

	public MapBounds(final Double northEastLat, final Double southWestLat, final Double northEastLng, final Double southWestLng) {
		this.northEastLat = northEastLat;
		this.southWestLat = southWestLat;
		this.northEastLng = northEastLng;
		this.southWestLng = southWestLng;
	}

	public Double getNorthEastLat() {
		return northEastLat;
	}

	public Double getSouthWestLat() {
		return southWestLat;
	}

	public Double getNorthEastLng() {
		return northEastLng;
	}

	public Double getSouthWestLng() {
		return southWestLng;
	}

	@Override
	public String toString() {
		return "MapBounds [northEastLat=" + northEastLat + ", southWestLat=" + southWestLat + ", northEastLng=" + northEastLng + ", southWestLng=" + southWestLng + "]";
	}

	@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = prime * result + ((northEastLat == null) ? 0 : northEastLat.hashCode());
		result = prime * result + ((northEastLng == null) ? 0 : northEastLng.hashCode());
		result = prime * result + ((southWestLat == null) ? 0 : southWestLat.hashCode());
		result = prime * result + ((southWestLng == null) ? 0 : southWestLng.hashCode());
		return result;
	}

	@Override
	public boolean equals(final Object obj) { // NOSONAR Autogenerated method
		if (this == obj) {
			return true;
		}
		if (obj == null) {
			return false;
		}
		if (!(obj instanceof MapBounds)) {
			return false;
		}
		MapBounds other = (MapBounds) obj;
		if (northEastLat == null) {
			if (other.northEastLat != null) {
				return false;
			}
		}
		else if (!northEastLat.equals(other.northEastLat)) {
			return false;
		}
		if (northEastLng == null) {
			if (other.northEastLng != null) {
				return false;
			}
		}
		else if (!northEastLng.equals(other.northEastLng)) {
			return false;
		}
		if (southWestLat == null) {
			if (other.southWestLat != null) {
				return false;
			}
		}
		else if (!southWestLat.equals(other.southWestLat)) {
			return false;
		}
		if (southWestLng == null) {
			if (other.southWestLng != null) {
				return false;
			}
		}
		else if (!southWestLng.equals(other.southWestLng)) {
			return false;
		}
		return true;
	}

	public static MapBounds normalize(final MapBounds bounds) {
		Double southWestLat = null;
		Double northEastLat = null;
		Double southWestLng = null;
		Double northEastLng = null;

		// Latitude
		if (bounds.getSouthWestLat() != null && bounds.getNorthEastLat() != null) {
			southWestLat = Math.max(MapBounds.LATITUDE_MIN_VALUE, bounds.getSouthWestLat());
			northEastLat = Math.min(MapBounds.LATITUDE_MAX_VALUE, bounds.getNorthEastLat());
		}

		// Longitude
		if (bounds.getSouthWestLng() != null && bounds.getNorthEastLng() != null) {
			if (Math.abs(bounds.getSouthWestLng() - bounds.getNorthEastLng()) >= MapBounds.LONGITUDE_MAX_VALUE * 2) {
				southWestLng = Double.valueOf(MapBounds.LONGITUDE_MIN_VALUE);
				northEastLng = Double.valueOf(MapBounds.LONGITUDE_MAX_VALUE);
			}
			else {
				double sw = bounds.getSouthWestLng();
				while (Math.abs(sw) > MapBounds.LONGITUDE_MAX_VALUE) {
					sw -= Math.signum(sw) * MapBounds.LONGITUDE_MAX_VALUE * 2;
				}
				southWestLng = Math.max(MapBounds.LONGITUDE_MIN_VALUE, sw);

				double ne = bounds.getNorthEastLng();
				while (Math.abs(ne) > MapBounds.LONGITUDE_MAX_VALUE) {
					ne -= Math.signum(ne) * MapBounds.LONGITUDE_MAX_VALUE * 2;
				}
				northEastLng = Math.min(MapBounds.LONGITUDE_MAX_VALUE, ne);
			}
		}

		return new MapBounds(northEastLat, southWestLat, northEastLng, southWestLng);
	}

}