Replaced a Java 1.5 method call with a 1.4 method call.

git-svn-id: svn+ssh://src.earth.threerings.net/nenya/trunk@554 ed5b42cb-e716-0410-a449-f6a68f950b19

src/java/com/threerings/miso/tile/AutoFringer.java

@@ -73,13 +73,30 @@ public class AutoFringer
         @Override
         public int hashCode ()
         {
-            int result = Arrays.hashCode(_fringeId);
+            int result = arrayHashCode(_fringeId);
             if(_passable) {
                 result++;
             }
             return result;
         }
         
+        /**
+         * Replaces Arrays.hashCode(long a[]) in AutoFringer.hashCode().
+         * Arrays.hashCode(long a[]) is undefined for Java 1.4, and this is client code.
+         */
+        protected int arrayHashCode(long a[]) {
+            if (a == null)
+                return 0;
+     
+            int result = 1;
+            for (long element : a) {
+                int elementHash = (int)(element ^ (element >>> 32));
+                result = 31 * result + elementHash;
+            }
+     
+            return result;
+        }
+        
         /** The fringe keys of the tiles that went into this tile in the order they were drawn. */
         protected long[] _fringeId;
     }