+package tim.prune.undo;
+
+import tim.prune.I18nManager;
+import tim.prune.data.DataPoint;
+import tim.prune.data.Track;
+import tim.prune.data.TrackInfo;
+
+/**
+ * Undo reversal of track section
+ */
+public class UndoReverseSection implements UndoOperation
+{
+ /** Start and end indices of section */
+ private int _startIndex, _endIndex;
+ /** First and last track point in section and next track point after */
+ private DataPoint _firstTrackPoint, _lastTrackPoint, _nextTrackPoint;
+ /** Segment flags for these points */
+ private boolean _firstSegmentFlag, _lastSegmentFlag, _nextSegmentFlag;
+
+
+ /**
+ * Constructor
+ * @param inTrack track object for copying segment flags
+ * @param inStart start index of section
+ * @param inEnd end index of section
+ */
+ public UndoReverseSection(Track inTrack, int inStart, int inEnd)
+ {
+ _startIndex = inStart;
+ _endIndex = inEnd;
+ // Look for first track point in section to be reversed, store flag
+ _firstTrackPoint = inTrack.getNextTrackPoint(inStart);
+ if (_firstTrackPoint != null) {
+ _firstSegmentFlag = _firstTrackPoint.getSegmentStart();
+ }
+ // Look for last track point in section to be reversed, store flag
+ _lastTrackPoint = inTrack.getPreviousTrackPoint(inEnd);
+ if (_lastTrackPoint != null) {
+ _lastSegmentFlag = _lastTrackPoint.getSegmentStart();
+ }
+ // Look for following track point, store flag
+ _nextTrackPoint = inTrack.getNextTrackPoint(inEnd + 1);
+ if (_nextTrackPoint != null) {
+ _nextSegmentFlag = _nextTrackPoint.getSegmentStart();
+ }
+ }
+
+
+ /**
+ * @return description of operation
+ */
+ public String getDescription()
+ {
+ return I18nManager.getText("undo.reverse");
+ }
+
+
+ /**
+ * Perform the undo operation on the given Track
+ * @param inTrackInfo TrackInfo object on which to perform the operation
+ */
+ public void performUndo(TrackInfo inTrackInfo) throws UndoException
+ {
+ if (!inTrackInfo.getTrack().reverseRange(_startIndex, _endIndex))
+ {
+ throw new UndoException(getDescription());
+ }
+ // Restore segment start flags
+ if (_firstTrackPoint != null) {
+ _firstTrackPoint.setSegmentStart(_firstSegmentFlag);
+ }
+ if (_lastTrackPoint != null) {
+ _lastTrackPoint.setSegmentStart(_lastSegmentFlag);
+ }
+ if (_nextTrackPoint != null) {
+ _nextTrackPoint.setSegmentStart(_nextSegmentFlag);
+ }
+ }
+}