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, 12 insertions, 1 deletions

diff --git a/altoslib/AltosMapStore.java b/altoslib/AltosMapStore.java
index 1107bec2..88412593 100644
--- a/altoslib/AltosMapStore.java
+++ b/altoslib/AltosMapStore.java
@@ -175,7 +175,18 @@ public class AltosMapStore {
 		}
 	}
 
-	public boolean equals(AltosMapStore other) {
+	public int hashCode() {
+		return url.hashCode();
+	}
+
+	public boolean equals(Object o) {
+		if (o == null)
+			return false;
+
+		if (!(o instanceof AltosMapStore))
+			return false;
+
+		AltosMapStore other = (AltosMapStore) o;
 		return url.equals(other.url);
 	}