private Map<Object, Object> docProviders = new WeakHashMap<Object, Object>();
    
	public void partOpened(IWorkbenchPart part) {
		if (part instanceof ITextEditor) {
			IDocumentProvider documentProvider = ((ITextEditor) part).getDocumentProvider();
			if (!docProviders.containsKey(documentProvider)) {
				documentProvider.addElementStateListener(saveEventListener);
			}
		}
	}

	private IElementStateListener saveEventListener = new IElementStateListener() {
		
		@Override
		public void elementDirtyStateChanged(Object element, boolean isDirty) {
			if (!isDirty) {
				System.out.println(element + " is saved at " + new Date());
			}
		}

		@Override
		public void elementMoved(Object originalElement, Object movedElement) {
			
		}

		@Override
		public void elementDeleted(Object element) {
		}
		
		@Override
		public void elementContentReplaced(Object element) {
		}
		
		@Override
		public void elementContentAboutToBeReplaced(Object element) {
		}
	};