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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);
}
}
}
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