/** * Add a property set. If the set does not yet exist in the sheet, inserts a new set with the * implied name. Otherwise the old set is replaced by the new one. * * @param set to add * @return the previous set with the same name, or <code>null</code> if this is a fresh insertion */ public synchronized Set put(Set set) { int indx = findIndex(set.getName()); Set removed; if (indx == -1) { sets.add(set); removed = null; } else { removed = (Set) sets.set(indx, set); } // listeners set.addPropertyChangeListener(propL); if (removed != null) { set.removePropertyChangeListener(propL); } refresh(); return removed; }