Added createReverse(), and make comparators compatible with a flex Sort

object.


git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@5691 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/as/com/threerings/util/Comparators.as

@@ -5,13 +5,14 @@ package com.threerings.util {
 
 /**
  * Contains sorting Comparators.
+ * These functions are suitable for passing to Array.sort(), or with a flex Sort object.
  */
 public class Comparators
 {
     /**
      * A standard Comparator for comparing Comparable values.
      */
-    public static function COMPARABLE (c1 :Comparable, c2 :Comparable) :int
+    public static function COMPARABLE (c1 :Comparable, c2 :Comparable, ... ignored) :int
     {
         if (c1 == c2) { // same object -or- both null
             return 0;
@@ -23,5 +24,15 @@ public class Comparators
             return c1.compareTo(c2);
         }
     }
+
+    /**
+     * Create a Comparator function that reverses the ordering of the specified Comparator.
+     */
+    public static function createReverse (comparator :Function) :Function
+    {
+        return function (o1 :Object, o2 :Object, ... ignored) :int {
+            return comparator(o2, o1); // simply reverse the ordering
+        }
+    }
 }
 }