altoslib/altosuilib: Fix equals methods, add hashCode

Whenever we use a class as a HashMap key, that class needs to override
the equals(Object) and hashCode() methods. Otherwise, the hash table
won't work right.

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

1 files changed, 11 insertions, 2 deletions

diff --git a/altoslib/AltosMapPathPoint.java b/altoslib/AltosMapPathPoint.java
index 9f82f02a..0d54744a 100644
--- a/altoslib/AltosMapPathPoint.java
+++ b/altoslib/AltosMapPathPoint.java
@@ -26,10 +26,19 @@ public class AltosMapPathPoint {
 	public AltosLatLon	lat_lon;
 	public int		state;
 
-	public boolean equals(AltosMapPathPoint other) {
-		if (other == null)
+	public int hashCode() {
+		return lat_lon.hashCode() ^ state;
+	}
+
+	public boolean equals(Object o) {
+		if (o == null)
 			return false;
 
+		if (!(o instanceof AltosMapPathPoint))
+			return false;
+
+		AltosMapPathPoint other = (AltosMapPathPoint) o;
+
 		return lat_lon.equals(other.lat_lon) && state == other.state;
 	}