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package tim.prune.data.sort;
import java.util.Comparator;
import tim.prune.data.DataPoint;
/**
* Class for comparing waypoints to sort them by name or timestamp
*/
public class WaypointComparer implements Comparator<DataPoint>
{
/** Sort mode */
private SortMode _sortMode;
/**
* Constructor
* @param inMode sort mode
*/
public WaypointComparer(SortMode inMode)
{
_sortMode = inMode;
}
/**
* Main compare method
*/
public int compare(DataPoint inP1, DataPoint inP2)
{
if (inP2 == null || !inP2.isWaypoint()) return -1; // all nulls at end
if (inP1 == null || !inP1.isWaypoint()) return 1;
// Sort by time, if requested
int result = 0;
if (_sortMode == SortMode.SORTBY_TIME) {
result = compareTimes(inP1, inP2);
}
// check names if names requested or if times didn't work
if (result == 0) {
result = inP1.getWaypointName().compareTo(inP2.getWaypointName());
}
// names and times equal, try longitude
if (result == 0) {
result = inP1.getLongitude().getDouble() > inP2.getLongitude().getDouble() ? 1 : -1;
}
// and latitude
if (result == 0) {
result = inP1.getLatitude().getDouble() > inP2.getLatitude().getDouble() ? 1 : -1;
}
return result;
}
/**
* Compare the timestamps of the two waypoints
* @param inP1 first point
* @param inP2 second point
* @return compare value (-1,0,1)
*/
private int compareTimes(DataPoint inP1, DataPoint inP2)
{
// Points might not have timestamps
if (inP1.hasTimestamp() && !inP2.hasTimestamp()) return 1;
if (!inP1.hasTimestamp() && inP2.hasTimestamp()) return -1;
if (inP1.hasTimestamp() && inP2.hasTimestamp())
{
// Compare the timestamps
long secDiff = inP1.getTimestamp().getMillisecondsSince(inP2.getTimestamp());
return (secDiff<0?-1:(secDiff==0?0:1));
}
// neither has a timestamp
return 0;
}
}
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