// License: GPL. For details, see LICENSE file.
package org.openstreetmap.josm.data.gpx;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import org.openstreetmap.josm.data.Bounds;
public class ImmutableGpxTrackSegment implements GpxTrackSegment {
private final Collection<WayPoint> wayPoints;
private final Bounds bounds;
private final double length;
public ImmutableGpxTrackSegment(Collection<WayPoint> wayPoints) {
this.wayPoints = Collections.unmodifiableCollection(new ArrayList<>(wayPoints));
this.bounds = calculateBounds();
this.length = calculateLength();
}
private Bounds calculateBounds() {
Bounds result = null;
for (WayPoint wpt: wayPoints) {
if (result == null) {
result = new Bounds(wpt.getCoor());
} else {
result.extend(wpt.getCoor());
}
}
return result;
}
private double calculateLength() {
double result = 0.0; // in meters
WayPoint last = null;
for (WayPoint tpt : wayPoints) {
if(last != null){
Double d = last.getCoor().greatCircleDistance(tpt.getCoor());
if(!d.isNaN() && !d.isInfinite()) {
result += d;
}
}
last = tpt;
}
return result;
}
@Override
public Bounds getBounds() {
if (bounds == null)
return null;
else
return new Bounds(bounds);
}
@Override
public Collection<WayPoint> getWayPoints() {
return wayPoints;
}
@Override
public double length() {
return length;
}
@Override
public int getUpdateCount() {
return 0;
}
}