Bug 127861 [DataBinding] Mark API provisional
bundles/org.eclipse.jface.databinding/src/org/eclipse/jface/databinding/updatables/ConvertingSet.java
for (Iterator iter = added.iterator(); iter.hasNext();) {
			Object next = iter.next();
			 
			Object target = func.calculate(next);
			
			if (target != null) {
				Collection keys = converter.addMapping(next, target);
				
				
				if (keys.size() == 1) {
					adds.add(target);
				}
			}
		}
		return adds;
		
	}
    private void processRemoves(Collection removed) {
    	
    	
    	if (converter == null) {
    		fireRemoved(removed);
    		return;
    	}
    	
    	ArrayList removes = new ArrayList();
    	
    	for (Iterator iter = removed.iterator(); iter.hasNext();) {
			Object next = iter.next();