tim/prune/undo/UndoLookupSrtm.java

   1 package tim.prune.undo;
   2
   3 import tim.prune.I18nManager;
   4 import tim.prune.UpdateMessageBroker;
   5 import tim.prune.data.DataPoint;
   6 import tim.prune.data.Field;
   7 import tim.prune.data.Track;
   8 import tim.prune.data.TrackInfo;
   9
  10 /**
  11  * Undo lookup of altitudes from SRTM data
  12  */
  13 public class UndoLookupSrtm implements UndoOperation
  14 {
  15         /** DataPoint objects which didn't have altitudes before */
  16         private DataPoint[] _points;
  17         /** Altitude strings if present */
  18         private String[] _altitudes;
  19
  20
  21         /**
  22          * Constructor
  23          * @param inTrackInfo track info object
  24          */
  25         public UndoLookupSrtm(TrackInfo inTrackInfo)
  26         {
  27                 Track track = inTrackInfo.getTrack();
  28                 int numPoints = track.getNumPoints();
  29                 // Make arrays of points and altitudes
  30                 _points = new DataPoint[numPoints];
  31                 _altitudes = new String[numPoints];
  32                 for (int i=0; i<numPoints; i++)
  33                 {
  34                         DataPoint point = track.getPoint(i);
  35                         if (!point.hasAltitude() || point.getAltitude().getValue() == 0)
  36                         {
  37                                 _points[i] = point;
  38                                 if (point.hasAltitude()) {
  39                                         _altitudes[i] = point.getFieldValue(Field.ALTITUDE);
  40                                 }
  41                         }
  42                 }
  43         }
  44
  45
  46         /**
  47          * @return description of operation
  48          */
  49         public String getDescription()
  50         {
  51                 return I18nManager.getText("undo.lookupsrtm");
  52         }
  53
  54
  55         /**
  56          * Perform the undo operation on the given Track
  57          * @param inTrackInfo TrackInfo object on which to perform the operation
  58          */
  59         public void performUndo(TrackInfo inTrackInfo) throws UndoException
  60         {
  61                 // Loop through points again, and reset altitudes if they have one
  62                 final int numPoints = _points.length;
  63                 for (int i=0; i<numPoints; i++) {
  64                         DataPoint point = _points[i];
  65                         if (point != null && point.hasAltitude()) {
  66                                 if (_altitudes[i] == null) {
  67                                         point.setFieldValue(Field.ALTITUDE, null, true);
  68                                 }
  69                                 else {
  70                                         point.setFieldValue(Field.ALTITUDE, _altitudes[i], true);
  71                                 }
  72                         }
  73                 }
  74                 _points = null;
  75                 UpdateMessageBroker.informSubscribers();
  76         }
  77 }