Version 10, May 2010

[GpsPrune.git] / tim / prune / data / Checker.java

diff --git a/tim/prune/data/Checker.java b/tim/prune/data/Checker.java
new file mode 100644 (file)
index 0000000..274c3e7
--- /dev/null
+++ b/tim/prune/data/Checker.java
@@ -0,0 +1,68 @@
+package tim.prune.data;
+
+/**
+ * Class to provide checking functions
+ */
+public abstract class Checker
+{
+
+       /**
+        * Check if a given track is doubled, so that each point is given twice,
+        * once as waypoint and again as track point
+        * @param inTrack track to check
+        * @return true if track is doubled, false otherwise
+        */
+       public static boolean isDoubledTrack(Track inTrack)
+       {
+               // Check for empty track
+               if (inTrack == null || inTrack.getNumPoints() < 2) {return false;}
+               // Check for non-even number of points
+               final int numPoints = inTrack.getNumPoints();
+               if (numPoints % 2 == 1) {return false;}
+               // Loop through first half of track
+               final int halfNum = numPoints / 2;
+               for (int i=0; i<halfNum; i++)
+               {
+                       DataPoint firstPoint = inTrack.getPoint(i);
+                       DataPoint secondPoint = inTrack.getPoint(i + halfNum);
+                       if (!firstPoint.getLatitude().equals(secondPoint.getLatitude())
+                               || !firstPoint.getLongitude().equals(secondPoint.getLongitude())) {
+                               return false;
+                       }
+               }
+               // Passed the test, so contents must all be doubled
+               return true;
+       }
+
+       /**
+        * Find the index of the next segment start after the given index
+        * @param inTrack track object
+        * @param inIndex current index
+        * @return index of next segment start
+        */
+       public static int getNextSegmentStart(Track inTrack, int inIndex)
+       {
+               int i = inIndex + 1;
+               DataPoint point = null;
+               while ((point=inTrack.getPoint(i)) != null && !point.getSegmentStart()) {
+                       i++;
+               }
+               return Math.min(i, inTrack.getNumPoints()-1);
+       }
+
+       /**
+        * Find the index of the previous segment start before the given index
+        * @param inTrack track object
+        * @param inIndex current index
+        * @return index of previous segment start
+        */
+       public static int getPreviousSegmentStart(Track inTrack, int inIndex)
+       {
+               int i = inIndex - 1;
+               DataPoint point = null;
+               while ((point=inTrack.getPoint(i)) != null && !point.getSegmentStart()) {
+                       i--;
+               }
+               return Math.max(i, 0);
+       }
+}