@Override
        public void delta(final long address, final long timestamp, final Tree tree, final int index,
                final int accumulatorTypeOrdinal, final long value) throws PersistitException {
            Accumulator.Type type = Accumulator.Type.values()[accumulatorTypeOrdinal];
            Accumulator accumulator = tree.getAccumulator(type, index);
            accumulator.updateBaseValue(value);
        }