tim/prune/load/TrackNameList.java

   1 package tim.prune.load;
   2
   3 import java.util.ArrayList;
   4
   5 /**
   6  * Class to hold and manage a list of track names
   7  * from a gpx file, and report back which points
   8  * belong to which track
   9  */
  10 public class TrackNameList
  11 {
  12         /** Current point number */
  13         private int _pointNum = -1;
  14         /** Current track number */
  15         private int _trackNum = -1;
  16         /** List of unique track names */
  17         private ArrayList<String> _trackNames = new ArrayList<String>();
  18         /** List of point numbers at the start of each track */
  19         private ArrayList<Integer> _startIndices = new ArrayList<Integer>();
  20
  21
  22         /**
  23          * Inform list of a new point
  24          * @param inTrackNum number of track, starting at zero
  25          * @param inTrackName name of track, if any
  26          * @param inIsTrackpoint true if point is a trackpoint
  27          */
  28         public void addPoint(int inTrackNum, String inTrackName, boolean inIsTrackpoint)
  29         {
  30                 _pointNum++;
  31                 if (inIsTrackpoint)
  32                 {
  33                         if (inTrackNum != _trackNum) {
  34                                 _trackNames.add(inTrackName);
  35                                 _startIndices.add(Integer.valueOf(_pointNum));
  36                         }
  37                 }
  38                 _trackNum = inTrackNum;
  39         }
  40
  41         /**
  42          * @return number of tracks found in file
  43          */
  44         public int getNumTracks()
  45         {
  46                 return _trackNames.size();
  47         }
  48
  49         /**
  50          * @param inTrackNum index of track, starting from zero
  51          * @return name of specified track (or null if none given)
  52          */
  53         public String getTrackName(int inTrackNum)
  54         {
  55                 if (inTrackNum < 0 || inTrackNum >= getNumTracks()) {return "";}
  56                 String name = _trackNames.get(inTrackNum);
  57                 return name;
  58         }
  59
  60         /**
  61          * @param inTrackNum index of track, starting from zero
  62          * @return number of points in the specified track
  63          */
  64         public int getNumPointsInTrack(int inTrackNum)
  65         {
  66                 if (inTrackNum < 0 || inTrackNum >= getNumTracks()) {return 0;}
  67                 if (inTrackNum == (getNumTracks()-1)) {
  68                         // last track, use total points
  69                         return _pointNum - _startIndices.get(inTrackNum) + 1;
  70                 }
  71                 return _startIndices.get(inTrackNum+1) - _startIndices.get(inTrackNum);
  72         }
  73
  74         /**
  75          * @param inTrackNum index of track, starting from zero
  76          * @return start index of the specified track
  77          */
  78         public int getStartIndex(int inTrackNum)
  79         {
  80                 if (inTrackNum < 0 || inTrackNum >= getNumTracks()) {return 0;}
  81                 return _startIndices.get(inTrackNum);
  82         }
  83 }