svn commit: r1091852 - /activemq/activemq-apollo/trunk/apollo-util/src/main/scala/org/apache/activemq/apollo/util/list/LinkedNode.java

[chirino]

Author: chirino
Date: Wed Apr 13 17:19:39 2011
New Revision: 1091852

URL: http://svn.apache.org/viewvc?rev=1091852&view=rev
Log:
Add a linked assertion check to provide a friendlier usage error message.

Modified:
    
activemq/activemq-apollo/trunk/apollo-util/src/main/scala/org/apache/activemq/apollo/util/list/LinkedNode.java

Modified: 
activemq/activemq-apollo/trunk/apollo-util/src/main/scala/org/apache/activemq/apollo/util/list/LinkedNode.java
URL: 
http://svn.apache.org/viewvc/activemq/activemq-apollo/trunk/apollo-util/src/main/scala/org/apache/activemq/apollo/util/list/LinkedNode.java?rev=1091852&r1=1091851&r2=1091852&view=diff
==============================================================================
--- 
activemq/activemq-apollo/trunk/apollo-util/src/main/scala/org/apache/activemq/apollo/util/list/LinkedNode.java
 (original)
+++ 
activemq/activemq-apollo/trunk/apollo-util/src/main/scala/org/apache/activemq/apollo/util/list/LinkedNode.java
 Wed Apr 13 17:19:39 2011
@@ -60,11 +60,17 @@ public class LinkedNode<T extends Linked
         return prev;
     }
 
+    final private void assertLinked() {
+        assert  list!=null && !list.isEmpty() : "Node is not linked";
+    }
+
     final public boolean isHeadNode() {
+        assertLinked();
         return list.head == this;
     }
 
     final public boolean isTailNode() {
+        assertLinked();
         return list.head.prev == this;
     }