throw new DictionaryException("Failed to write: " + line, e);
            }
        }

        /**
         * Commits any pending changes and marks the updater for final write.
         *
         * @return the committed mapping item, or null if no item was pending
         */
        public CharMappingItem commit() {
            isCommit = true;
            if (item != null && item.isUpdated()) {

                throw new DictionaryException("Failed to write: " + line, e);
            }
        }

        /**
         * Commits the changes to the dictionary file.
         * If there is a pending new item, it is written to the file.
         *
         * @return The committed item, or null if no item was committed.
         * @throws DictionaryException if an I/O error occurs.
         */