altoslib: Add a 'seconds' method to AltosGPS

This computes the time in seconds since the epoch from GPS time
information.

Signed-off-by: Keith Packard <keithp@keithp.com>

1 files changed, 19 insertions, 0 deletions

diff --git a/altoslib/AltosGPS.java b/altoslib/AltosGPS.java
index 99d48c38..0b30ed45 100644
--- a/altoslib/AltosGPS.java
+++ b/altoslib/AltosGPS.java
@@ -21,6 +21,7 @@ package org.altusmetrum.altoslib_11;
 import java.text.*;
 import java.util.concurrent.*;
 import java.io.*;
+import java.time.*;
 
 public class AltosGPS implements Cloneable {
 
@@ -73,6 +74,24 @@ public class AltosGPS implements Cloneable {
 		hour = minute = second = AltosLib.MISSING;
 	}
 
+	/* Return time since epoc in seconds */
+	public long seconds() {
+		if (year == AltosLib.MISSING)
+			return AltosLib.MISSING;
+		if (month == AltosLib.MISSING)
+			return AltosLib.MISSING;
+		if (day == AltosLib.MISSING)
+			return AltosLib.MISSING;
+		if (hour == AltosLib.MISSING)
+			return AltosLib.MISSING;
+		if (minute == AltosLib.MISSING)
+			return AltosLib.MISSING;
+		if (second == AltosLib.MISSING)
+			return AltosLib.MISSING;
+		OffsetDateTime	odt = OffsetDateTime.of(year, month, day, hour, minute, second, 0, ZoneOffset.UTC);
+		return odt.toEpochSecond();
+	}
+
 	public AltosGPS(AltosTelemetryMap map) throws ParseException {
 		String	state = map.get_string(AltosTelemetryLegacy.AO_TELEM_GPS_STATE,
 					       AltosTelemetryLegacy.AO_TELEM_GPS_STATE_ERROR);