@Override
    public String toString() {
        final StringBuilder sb = new StringBuilder();
        final SortedSet<TransactionMapItem> sorted = new TreeSet<TransactionMapItem>(_recoveredTransactionMap.values());
        for (final TransactionMapItem ts : sorted) {
            sb.append(ts);
            sb.append(Util.NEW_LINE);
        }
        return sb.toString();
    }