tim/prune/undo/UndoCompress.java

   1 package tim.prune.undo;\r
   2 \r
   3 import tim.prune.I18nManager;\r
   4 import tim.prune.data.DataPoint;\r
   5 import tim.prune.data.Track;\r
   6 import tim.prune.data.TrackInfo;\r
   7 \r
   8 /**\r
   9  * Operation to undo a track compression\r
  10  */\r
  11 public class UndoCompress implements UndoOperation\r
  12 {\r
  13         private DataPoint[] _contents = null;\r
  14         protected int _numPointsDeleted = -1;\r
  15         private boolean[] _segmentStarts = null;\r
  16 \r
  17 \r
  18         /**\r
  19          * Constructor\r
  20          * @param inTrack track contents to copy\r
  21          */\r
  22         public UndoCompress(Track inTrack)\r
  23         {\r
  24                 _contents = inTrack.cloneContents();\r
  25                 // Copy boolean segment start flags\r
  26                 _segmentStarts = new boolean[inTrack.getNumPoints()];\r
  27                 for (int i=0; i<inTrack.getNumPoints(); i++) {\r
  28                         _segmentStarts[i] = inTrack.getPoint(i).getSegmentStart();\r
  29                 }\r
  30         }\r
  31 \r
  32 \r
  33         /**\r
  34          * Set the number of points deleted\r
  35          * (only known after attempted compression)\r
  36          * @param inNum number of points deleted\r
  37          */\r
  38         public void setNumPointsDeleted(int inNum)\r
  39         {\r
  40                 _numPointsDeleted = inNum;\r
  41         }\r
  42 \r
  43 \r
  44         /**\r
  45          * @return description of operation including parameters\r
  46          */\r
  47         public String getDescription()\r
  48         {\r
  49                 String desc = I18nManager.getText("undo.compress");\r
  50                 if (_numPointsDeleted > 0)\r
  51                         desc = desc + " (" + _numPointsDeleted + ")";\r
  52                 return desc;\r
  53         }\r
  54 \r
  55 \r
  56         /**\r
  57          * Perform the undo operation on the given Track\r
  58          * @param inTrackInfo TrackInfo object on which to perform the operation\r
  59          */\r
  60         public void performUndo(TrackInfo inTrackInfo) throws UndoException\r
  61         {\r
  62                 // restore track to previous values\r
  63                 inTrackInfo.getTrack().replaceContents(_contents);\r
  64                 // Copy boolean segment start flags\r
  65                 Track track = inTrackInfo.getTrack();\r
  66                 if (_segmentStarts.length != track.getNumPoints())\r
  67                         throw new UndoException("Cannot undo compress - track length no longer matches");\r
  68                 for (int i=0; i<_segmentStarts.length; i++) {\r
  69                         track.getPoint(i).setSegmentStart(_segmentStarts[i]);\r
  70                 }\r
  71                 // clear selection\r
  72                 inTrackInfo.getSelection().clearAll();\r
  73         }\r
  74 }