as(), casts the argument or returns null if it's not an instance of

the specified class.
Yeah.
I've had this laying around for a long time, almost embarrassed by it.
But I keep running into places where it'd be handy, and now I'm
going for it.


git-svn-id: https://samskivert.googlecode.com/svn/trunk@2940 6335cc39-0255-0410-8fd6-9bcaacd3b74c

src/main/java/com/samskivert/util/ObjectUtil.java

@@ -32,6 +32,14 @@ import com.samskivert.annotation.*;
  */
 public class ObjectUtil
 {
+    /**
+     * Cast the specified Object, or return null if it is not an instance.
+     */
+    public static <T> T as (Object obj, Class<T> clazz)
+    {
+        return clazz.isInstance(obj) ? clazz.cast(obj) : null;
+    }
+
     /**
      * Test two objects for equality safely.
      */