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package cgeo.geocaching.sorting;
import cgeo.geocaching.cgCache;
import cgeo.geocaching.geopoint.Geopoint;
import java.util.List;
/**
* sorts caches by distance to given position
*
*/
public class DistanceComparator extends AbstractCacheComparator {
final private Geopoint coords;
final private List<cgCache> list;
private boolean cachedDistances;
public DistanceComparator(final Geopoint coords, List<cgCache> list) {
this.coords = coords;
this.list = list;
}
/**
* calculate all distances only once to avoid costly re-calculation of the same distance during sorting
*/
private void calculateAllDistances() {
if (cachedDistances) {
return;
}
for (cgCache cache : list) {
if (cache.getCoords() != null) {
cache.setDistance(coords.distanceTo(cache.getCoords()));
}
else {
cache.setDistance(null);
}
}
cachedDistances = true;
}
@Override
protected boolean canCompare(cgCache cache1, cgCache cache2) {
return true;
}
@Override
protected int compareCaches(final cgCache cache1, final cgCache cache2) {
calculateAllDistances();
if (cache1.getCoords() == null && cache2.getCoords() == null) {
return 0;
}
if (cache1.getCoords() == null) {
return 1;
}
if (cache2.getCoords() == null) {
return -1;
}
return Float.compare(cache1.getDistance(), cache2.getDistance());
}
}
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