public void performImport()

in openmeetings-install/src/main/java/org/apache/openmeetings/backup/BackupImport.java [413:499]
80 lines of code
8 McCabe index (conditional complexity)

	public void performImport(InputStream is, AtomicInteger progress) throws Exception {
		File f = null;
		boolean success = false;
		try {
			progress.set(0);
			cleanup();
			messageFolderMap.put(INBOX_FOLDER_ID, INBOX_FOLDER_ID);
			messageFolderMap.put(SENT_FOLDER_ID, SENT_FOLDER_ID);
			messageFolderMap.put(TRASH_FOLDER_ID, TRASH_FOLDER_ID);

			f = unzip(is);

			BackupVersion ver = getVersion(f);
			progress.set(2);
			importConfigs(f);
			progress.set(7);
			importGroups(f);
			progress.set(12);
			importLdap(f);
			progress.set(17);
			importOauth(f);
			progress.set(22);
			importUsers(f);
			progress.set(27);
			importRooms(f);
			progress.set(32);
			importRoomGroups(f);
			progress.set(37);
			importChat(f);
			progress.set(42);
			importCalendars(f);
			progress.set(47);
			importAppointments(f);
			progress.set(52);
			importMeetingMembers(f);
			progress.set(57);
			importRecordings(f);
			progress.set(62);
			importPrivateMsgFolders(f);
			progress.set(67);
			importContacts(f);
			progress.set(72);
			importPrivateMsgs(f);
			progress.set(77);
			List<FileItem> files = importFiles(f);
			progress.set(82);
			importPolls(f);
			progress.set(87);
			importRoomFiles(f);
			progress.set(92);
			importExtraMenus(f);
			progress.set(95);

			log.info("Extra menus import complete, starting copy of files and folders");
			/*
			 * ##################### Import real files and folders
			 */
			importFolders(f);
			progress.set(97);

			if (ver.compareTo(BackupVersion.get("4.0.0")) < 0) {
				for (FileItem bfi : files) {
					if (bfi.isDeleted()) {
						continue;
					}
					if (BaseFileItem.Type.PRESENTATION == bfi.getType()) {
						convertOldPresentation(bfi);
						fileItemDao.updateBase(bfi);
					}
					if (BaseFileItem.Type.WML_FILE == bfi.getType()) {
						convertWb(bfi);
					}
				}
			}
			log.info("File explorer item import complete");
			success = true;
		} finally {
			if (f != null) {
				log.info("Clearing temp files ...");
				FileUtils.deleteDirectory(f);
			}
			cleanup();
			if (success) {
				progress.set(100);
			}
		}
	}