Version 11, August 2010

[GpsPrune.git] / tim / prune / load / TrackNameList.java

diff --git a/tim/prune/load/TrackNameList.java b/tim/prune/load/TrackNameList.java
new file mode 100644 (file)
index 0000000..287e71d
--- /dev/null
+++ b/tim/prune/load/TrackNameList.java
@@ -0,0 +1,96 @@
+package tim.prune.load;
+
+import java.util.ArrayList;
+
+/**
+ * Class to hold and manage a list of track names
+ * from a gpx file, and report back which points
+ * belong to which track
+ */
+public class TrackNameList
+{
+       /** Current point number */
+       private int _pointNum = -1;
+       /** Current track number */
+       private int _trackNum = -1;
+       /** List of unique track names */
+       private ArrayList<String> _trackNames = new ArrayList<String>();
+       /** List of point numbers at the start of each track */
+       private ArrayList<Integer> _startIndices = new ArrayList<Integer>();
+
+
+       /**
+        * Inform list of a new point
+        * @param inTrackNum number of track, starting at zero
+        * @param inTrackName name of track, if any
+        * @param inIsTrackpoint true if point is a trackpoint
+        */
+       public void addPoint(int inTrackNum, String inTrackName, boolean inIsTrackpoint)
+       {
+               _pointNum++;
+               if (inIsTrackpoint)
+               {
+                       // System.out.println("Point " + _pointNum + " is in track '" + inTrackName + "' (" + inTrackNum + ")");
+                       if (inTrackNum != _trackNum) {
+                               _trackNames.add(inTrackName);
+                               _startIndices.add(new Integer(_pointNum));
+                       }
+               }
+               _trackNum = inTrackNum;
+       }
+
+       /**
+        * @return number of tracks found in file
+        */
+       public int getNumTracks()
+       {
+               return _trackNames.size();
+       }
+
+       /**
+        * @param inTrackNum index of track, starting from zero
+        * @return name of specified track (or null if none given)
+        */
+       public String getTrackName(int inTrackNum)
+       {
+               if (inTrackNum < 0 || inTrackNum >= getNumTracks()) {return "";}
+               String name = _trackNames.get(inTrackNum);
+               return name;
+       }
+
+       /**
+        * @param inTrackNum index of track, starting from zero
+        * @return number of points in the specified track
+        */
+       public int getNumPointsInTrack(int inTrackNum)
+       {
+               if (inTrackNum < 0 || inTrackNum >= getNumTracks()) {return 0;}
+               if (inTrackNum == (getNumTracks()-1)) {
+                       // last track, use total points
+                       return _pointNum - _startIndices.get(inTrackNum) + 1;
+               }
+               return _startIndices.get(inTrackNum+1) - _startIndices.get(inTrackNum);
+       }
+
+       /**
+        * @param inTrackNum index of track, starting from zero
+        * @return start index of the specified track
+        */
+       public int getStartIndex(int inTrackNum)
+       {
+               if (inTrackNum < 0 || inTrackNum >= getNumTracks()) {return 0;}
+               return _startIndices.get(inTrackNum);
+       }
+
+       /**
+        * Print summary for debug
+        * @deprecated
+        */
+       public void summarize()
+       {
+               System.out.println("File has " + getNumTracks() + " tracks:");
+               for (int i=0; i<getNumTracks(); i++) {
+                       System.out.println("  Track " + i + " is called '" + _trackNames.get(i) + "' and has " + getNumPointsInTrack(i) + " points");
+               }
+       }
+}