X-Git-Url: http://gitweb.fperrin.net/?p=GpsPrune.git;a=blobdiff_plain;f=src%2Ftim%2Fprune%2Fdata%2FChecker.java;fp=src%2Ftim%2Fprune%2Fdata%2FChecker.java;h=9d84fabacec3f20e4bbb2ecded9170715410d5bf;hp=0000000000000000000000000000000000000000;hb=ce6f2161b8596f7018d6a76bff79bc9e571f35fd;hpb=2d8cb72e84d5cc1089ce77baf1e34ea3ea2f8465

diff --git a/src/tim/prune/data/Checker.java b/src/tim/prune/data/Checker.java
new file mode 100644
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--- /dev/null
+++ b/src/tim/prune/data/Checker.java
@@ -0,0 +1,118 @@
+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 != 0) {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.isWaypoint() || !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.isWaypoint() || !point.getSegmentStart())) {
+			i--;
+		}
+		// Have we gone past the beginning of the track?
+		i = Math.max(i, 0);
+		// count forwards past the waypoints if necessary
+		while ((point=inTrack.getPoint(i)) != null && point.isWaypoint()) {
+			i++;
+		}
+		return i;
+	}
+
+	/**
+	 * Find the index of the last track point in the current segment
+	 * @param inTrack track object
+	 * @param inIndex current index
+	 * @return index of next segment end
+	 */
+	public static int getNextSegmentEnd(Track inTrack, int inIndex)
+	{
+		// First, go to start of following segment, or the end of the track
+		int i = getNextSegmentStart(inTrack, inIndex);
+		// If it's the next segment, subtract one
+		DataPoint point = inTrack.getPoint(i);
+		if (point == null || point.getSegmentStart())
+		{
+			i--;
+		}
+		// Now we may be on a waypoint, so count back to get the last track point
+		while ((point=inTrack.getPoint(i)) != null && point.isWaypoint()) {
+			i--;
+		}
+		return Math.min(i, inTrack.getNumPoints()-1);
+	}
+
+
+	/**
+	 * @param inTrack track object
+	 * @return true if there is at least one waypoint with a timestamp
+	 */
+	public static boolean haveWaypointsGotTimestamps(Track inTrack)
+	{
+		if (inTrack != null)
+		{
+			for (int i=0; i<inTrack.getNumPoints(); i++)
+			{
+				DataPoint p = inTrack.getPoint(i);
+				if (p != null && p.isWaypoint() && p.hasTimestamp())
+				{
+					return true;
+				}
+			}
+		}
+		return false;
+	}
+}