tim/prune/undo/UndoLoad.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.TrackInfo;\r
   6 \r
   7 /**\r
   8  * Operation to undo a load operation\r
   9  */\r
  10 public class UndoLoad implements UndoOperation\r
  11 {\r
  12         private int _cropIndex = -1;\r
  13         private int _numLoaded = -1;\r
  14         private DataPoint[] _contents = null;\r
  15         private String _previousFilename = null;\r
  16 \r
  17 \r
  18         /**\r
  19          * Constructor for appending\r
  20          * @param inIndex index number of crop point\r
  21          * @param inNumLoaded number of points loaded\r
  22          */\r
  23         public UndoLoad(int inIndex, int inNumLoaded)\r
  24         {\r
  25                 _cropIndex = inIndex;\r
  26                 _numLoaded = inNumLoaded;\r
  27                 _contents = null;\r
  28                 _previousFilename = null;\r
  29         }\r
  30 \r
  31 \r
  32         /**\r
  33          * Constructor for replacing\r
  34          * @param inOldTrack track being replaced\r
  35          * @param inNumLoaded number of points loaded\r
  36          */\r
  37         public UndoLoad(TrackInfo inOldTrackInfo, int inNumLoaded)\r
  38         {\r
  39                 _cropIndex = -1;\r
  40                 _numLoaded = inNumLoaded;\r
  41                 _contents = inOldTrackInfo.getTrack().cloneContents();\r
  42                 if (inOldTrackInfo.getFileInfo().getNumFiles() == 1)\r
  43                         _previousFilename = inOldTrackInfo.getFileInfo().getFilename();\r
  44         }\r
  45 \r
  46 \r
  47         /**\r
  48          * @return description of operation including number of points loaded\r
  49          */\r
  50         public String getDescription()\r
  51         {\r
  52                 String desc = I18nManager.getText("undo.load");\r
  53                 if (_numLoaded > 0)\r
  54                         desc = desc + " (" + _numLoaded + ")";\r
  55                 return desc;\r
  56         }\r
  57 \r
  58 \r
  59         /**\r
  60          * Perform the undo operation on the given Track\r
  61          * @param inTrackInfo TrackInfo object on which to perform the operation\r
  62          */\r
  63         public void performUndo(TrackInfo inTrackInfo) throws UndoException\r
  64         {\r
  65                 // remove file from fileinfo\r
  66                 inTrackInfo.getFileInfo().removeFile();\r
  67                 if (_previousFilename != null)\r
  68                 {\r
  69                         inTrackInfo.getFileInfo().setFile(_previousFilename);\r
  70                 }\r
  71                 // Crop / replace\r
  72                 if (_contents == null)\r
  73                 {\r
  74                         // crop track to previous size\r
  75                         inTrackInfo.getTrack().cropTo(_cropIndex);\r
  76                 }\r
  77                 else\r
  78                 {\r
  79                         // replace track contents with old\r
  80                         if (!inTrackInfo.getTrack().replaceContents(_contents))\r
  81                         {\r
  82                                 throw new UndoException(getDescription());\r
  83                         }\r
  84                 }\r
  85                 // clear selection\r
  86                 inTrackInfo.getSelection().clearAll();\r
  87         }\r
  88 }