altoslib/altosuilib: Fix equals methods, add hashCode

[fw/altos] / altoslib / AltosPointInt.java

diff --git a/altoslib/AltosPointInt.java b/altoslib/AltosPointInt.java
index 5d884391c8b5502d5d0a679cc72e75a047d6ed58..a7dd00f7e7e3093914c48bc4d7a1f8be2cd618a4 100644 (file)
--- a/altoslib/AltosPointInt.java
+++ b/altoslib/AltosPointInt.java
@@ -20,7 +20,19 @@ package org.altusmetrum.altoslib_7;
 public class AltosPointInt {
        public int      x, y;
 
-       public boolean equals(AltosPointInt n) {
+       public int hashCode() {
+               return  x ^ y;
+       }
+
+       public boolean equals(Object o) {
+               if (o == null)
+                       return false;
+
+               if (!(o instanceof AltosPointInt))
+                       return false;
+
+               AltosPointInt n = (AltosPointInt) o;
+
                return n.x == x && n.y == y;
        }