Added pickRandom(Collection).

git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@3963 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/java/com/threerings/util/RandomUtil.java

@@ -21,6 +21,7 @@
 
 package com.threerings.util;
 
+import java.util.Collection;
 import java.util.Iterator;
 import java.util.List;
 import java.util.Random;
@@ -183,6 +184,14 @@ public class RandomUtil
         return (index >= values.length) ? null : values[index];
     }
 
+    /**
+     * Picks a random object from the supplied {@link Collection}.
+     */
+    public static Object pickRandom (Collection values)
+    {
+        return pickRandom(values.iterator(), values.size());
+    }
+
     /**
      * Picks a random object from the supplied List
      *