//-----------------------------------------------------------------------
/**
* Registers a cursor to be notified of changes to this list.
*
* @param cursor the cursor to register
*/
protected virtual void registerCursor(Cursor cursor)
{
// We take this opportunity to clean the cursors list
// of WeakReference objects to garbage-collected cursors.
for (java.util.Iterator <Object> it = cursors.iterator(); it.hasNext();)
{
java.lang.refj.WeakReference <Object> refJ = (java.lang.refj.WeakReference <Object>)it.next();
if (refJ.get() == null)
{
it.remove();
}
}
cursors.add(new java.lang.refj.WeakReference <Object>(cursor));
}
/**
* Informs all of my registered cursors that the specified
* element was just added to my list.
*
* @param node the node that was changed
*/
protected virtual void broadcastNodeInserted(Node node)
{
java.util.Iterator <Object> it = cursors.iterator();
while (it.hasNext())
{
java.lang.refj.WeakReference <Object> refJ = (java.lang.refj.WeakReference <Object>)it.next();
Cursor cursor = (Cursor)refJ.get();
if (cursor == null)
{
it.remove(); // clean up list
}
else
{
cursor.nodeInserted(node);
}
}
}
/**
* Deregisters a cursor from the list to be notified of changes.
*
* @param cursor the cursor to deregister
*/
protected virtual void unregisterCursor(Cursor cursor)
{
for (java.util.Iterator <Object> it = cursors.iterator(); it.hasNext();)
{
java.lang.refj.WeakReference <Object> refJ = (java.lang.refj.WeakReference <Object>)it.next();
Cursor cur = (Cursor)refJ.get();
if (cur == null)
{
// some other unrelated cursor object has been
// garbage-collected; let's take the opportunity to
// clean up the cursors list anyway..
it.remove();
}
else if (cur == cursor)
{
refJ.clear();
it.remove();
break;
}
}
}
