altoslib: Keep time series in AltosFlightSeries array sorted

This makes using the graph way easier.

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

1 files changed, 5 insertions, 1 deletions

diff --git a/altoslib/AltosTimeSeries.java b/altoslib/AltosTimeSeries.java
index db33fafa..5cf46c9a 100644
--- a/altoslib/AltosTimeSeries.java
+++ b/altoslib/AltosTimeSeries.java
@@ -16,11 +16,15 @@ package org.altusmetrum.altoslib_11;
 
 import java.util.*;
 
-public class AltosTimeSeries implements Iterable<AltosTimeValue> {
+public class AltosTimeSeries implements Iterable<AltosTimeValue>, Comparable<AltosTimeSeries> {
 	public String			label;
 	public AltosUnits		units;
 	ArrayList<AltosTimeValue>	values;
 
+	public int compareTo(AltosTimeSeries other) {
+		return label.compareTo(other.label);
+	}
+
 	public void add(AltosTimeValue tv) {
 		values.add(tv);
 	}