src/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         /** Whether all altitudes were overwriten (in which case
  20          * _points will have the full track) */
  21         boolean overwriteAlt;
  22
  23
  24         /**
  25          * Constructor
  26          * @param inTrackInfo track info object
  27          */
  28         public UndoLookupSrtm(TrackInfo inTrackInfo, boolean overwriteAlt)
  29         {
  30                 Track track = inTrackInfo.getTrack();
  31                 int numPoints = track.getNumPoints();
  32                 // Make arrays of points and altitudes
  33                 _points = new DataPoint[numPoints];
  34                 _altitudes = new String[numPoints];
  35                 for (int i=0; i<numPoints; i++)
  36                 {
  37                         DataPoint point = track.getPoint(i);
  38                         if (overwriteAlt || !point.hasAltitude() || point.getAltitude().getValue() == 0)
  39                         {
  40                                 _points[i] = point;
  41                                 if (point.hasAltitude()) {
  42                                         _altitudes[i] = point.getFieldValue(Field.ALTITUDE);
  43                                 }
  44                         }
  45                 }
  46         }
  47
  48
  49         /**
  50          * @return description of operation
  51          */
  52         public String getDescription()
  53         {
  54                 return I18nManager.getText("undo.lookupsrtm");
  55         }
  56
  57
  58         /**
  59          * Perform the undo operation on the given Track
  60          * @param inTrackInfo TrackInfo object on which to perform the operation
  61          */
  62         public void performUndo(TrackInfo inTrackInfo) throws UndoException
  63         {
  64                 // Loop through points again, and reset altitudes if they have one
  65                 final int numPoints = _points.length;
  66                 for (int i=0; i<numPoints; i++) {
  67                         DataPoint point = _points[i];
  68                         if (point != null && point.hasAltitude()) {
  69                                 if (_altitudes[i] == null) {
  70                                         point.setFieldValue(Field.ALTITUDE, null, true);
  71                                 }
  72                                 else {
  73                                         point.setFieldValue(Field.ALTITUDE, _altitudes[i], true);
  74                                 }
  75                         }
  76                 }
  77                 _points = null;
  78                 UpdateMessageBroker.informSubscribers();
  79         }
  80 }