/** @private Debugging purposes */
 protected void toStringInfo(int tab, StringBuffer buffer, Object info, boolean showResolvedInfo) {
   super.toStringInfo(tab, buffer, info, showResolvedInfo);
   if (showResolvedInfo) {
     buffer.append(" {key="); // $NON-NLS-1$
     buffer.append(this.uniqueKey);
     buffer.append("}"); // $NON-NLS-1$
   }
 }