Added a handy little rotateTo method to be able to quickly rotate to a specific node.

git-svn-id: https://svn.apache.org/repos/asf/activemq/trunk@740329 13f79535-47bb-0310-9956-ffa450edef68

kahadb/src/main/java/org/apache/kahadb/util/LinkedNodeList.java

@@ -105,6 +105,17 @@ public class LinkedNodeList<T extends LinkedNode<T>> {
         return head = head.getNextCircular();
     }
 
+    /**
+     * Move the head to the tail and returns the new head node.
+     * 
+     * @return
+     */
+    public void rotateTo(T head) {
+    	assert head!=null: "Cannot rotate to a null head";
+    	assert head.list == this : "Cannot rotate to a node not linked to this list";
+        this.head = head;
+    }
+
     public int size() {
         return size;
     }