tim/prune/undo/UndoDeleteFieldValues.java

   1 package tim.prune.undo;\r
   2 \r
   3 import tim.prune.I18nManager;\r
   4 import tim.prune.UpdateMessageBroker;\r
   5 import tim.prune.data.DataPoint;\r
   6 import tim.prune.data.Field;\r
   7 import tim.prune.data.Track;\r
   8 import tim.prune.data.TrackInfo;\r
   9 \r
  10 /**\r
  11  * Operation to undo the deletion of field values\r
  12  */\r
  13 public class UndoDeleteFieldValues implements UndoOperation\r
  14 {\r
  15         /** Start and end indices of section */\r
  16         private int _startIndex, _endIndex;\r
  17         /** Field to be deleted */\r
  18         private Field _field = null;\r
  19         /** Field values before operation */\r
  20         private String[] _fieldValues = null;\r
  21 \r
  22         /**\r
  23          * Constructor\r
  24          * @param inTrackInfo track info object to copy values from\r
  25          * @param inField field to delete\r
  26          */\r
  27         public UndoDeleteFieldValues(TrackInfo inTrackInfo, Field inField)\r
  28         {\r
  29                 _startIndex = inTrackInfo.getSelection().getStart();\r
  30                 _endIndex = inTrackInfo.getSelection().getEnd();\r
  31                 final int numPoints = _endIndex - _startIndex + 1;\r
  32                 _fieldValues = new String[numPoints];\r
  33                 _field = inField;\r
  34                 // Loop over points in selection, and copy field values\r
  35                 for (int i=_startIndex; i<=_endIndex; i++)\r
  36                 {\r
  37                         DataPoint point = inTrackInfo.getTrack().getPoint(i);\r
  38                         _fieldValues[i-_startIndex] = point.getFieldValue(inField);\r
  39                 }\r
  40         }\r
  41 \r
  42 \r
  43         /**\r
  44          * @return description of operation\r
  45          */\r
  46         public String getDescription()\r
  47         {\r
  48                 return I18nManager.getText("undo.deletefieldvalues");\r
  49         }\r
  50 \r
  51 \r
  52         /**\r
  53          * Perform the undo operation on the given Track\r
  54          * @param inTrackInfo TrackInfo object on which to perform the operation\r
  55          */\r
  56         public void performUndo(TrackInfo inTrackInfo) throws UndoException\r
  57         {\r
  58                 // Sanity check\r
  59                 Track track = inTrackInfo.getTrack();\r
  60                 if (track.getNumPoints() <= _endIndex || _endIndex <= _startIndex) {\r
  61                         throw new UndoException("Cannot undo conversion, track length doesn't match");\r
  62                 }\r
  63                 // Loop over points in selection and replace field values\r
  64                 for (int i=_startIndex; i<=_endIndex; i++)\r
  65                 {\r
  66                         String storedValue = _fieldValues[i-_startIndex];\r
  67                         if (storedValue != null) {\r
  68                                 track.getPoint(i).setFieldValue(_field, storedValue, true);\r
  69                         }\r
  70                 }\r
  71                 track.requestRescale();\r
  72                 inTrackInfo.getSelection().markInvalid();\r
  73                 UpdateMessageBroker.informSubscribers();\r
  74         }\r
  75 }\r