Re: Iterator problems collections

[Stephen Colebourne]

I can't see anything wrong with what you've sent, but I don't have the 
complete code. I suggest you break your task down into parts and check 
whether you really are converting the objects, or whether perhaps you are 
converting them at the wrong time in your logic.
Stephen
----- Original Message ----- 
From: "J�rg Herbst" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Friday, December 10, 2004 6:05 PM
Subject: Iterator problems collections


Hi folks,
I've got a problem with the CollecionUtils.filter method and
the Iterator wrappers. I've written a custom Collections class
which stores a tree data structure (based on DefaultMutableTreenode).
I want to hide the implementation (the usage of
DefaultMutableTreeNode) and provided an iterator() methods which
should return my user objects:
   /**
    * Gets an iterator with all user objects
    */
   public Iterator iterator() {
       Iterator it = new EnumerationIterator(
           root.breadthFirstEnumeration(),this);
       Iterator tranformedIt =
           IteratorUtils.transformedIterator(it,
               new TreeNodeToUserObjectTransformer());
       return tranformedIt;
   }
   /**
    * Internal Transformer class for converting a TreeNode
    * to it's user object
    */
   private class TreeNodeToUserObjectTransformer implements Transformer {
       public Object transform(Object o) {
           DefaultMutableTreeNode node = (DefaultMutableTreeNode) o;
           return node.getUserObject();
       }
      }
Now I'm calling CollectionUtils.filter(myCollection,myPredicate)
and suspected to get my user objects passed to the removed(Object o)
method. But instead of getting the userObjects, I get
DefaultMutableTreeNOdes. Can anybody tell me what I'm doing wrong?
Thx
Joerg
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