private static void performExport()

in src/main/java/software/amazon/documentdb/jdbc/DocumentDbMain.java [514:560]
43 lines of code
8 McCabe index (conditional complexity)

    private static void performExport(
            final CommandLine commandLine,
            final DocumentDbConnectionProperties properties,
            final StringBuilder output) throws SQLException {

        // Determine if output file is required.
        final File outputFile;
        if (commandLine.hasOption(OUTPUT_OPTION_FLAG)) {
            outputFile = tryGetOutputFile(commandLine, output);
            if (outputFile == null) {
                return;
            }
        } else {
            outputFile = null;
        }

        final String[] requestedTableNames = commandLine.getOptionValues(EXPORT_OPTION_FLAG);
        final List<String> requestedTableList = requestedTableNames != null
                ? Arrays.asList(requestedTableNames)
                : new ArrayList<>();
        final DocumentDbDatabaseSchemaMetadata schema = DocumentDbDatabaseSchemaMetadata.get(
                properties,
                properties.getSchemaName(),
                VERSION_LATEST_OR_NONE,
                getMongoClient(properties));
        if (schema == null) {
            // No schema to export.
            return;
        }
        final Set<String> availTableSet = schema.getTableSchemaMap().keySet();
        if (requestedTableList.isEmpty()) {
            requestedTableList.addAll(availTableSet);
        } else if (verifyRequestedTablesExist(requestedTableList, availTableSet, output)) {
            return;
        }
        final List<TableSchema> tableSchemaList = requestedTableList.stream()
                .map(tableName -> new TableSchema(schema.getTableSchemaMap().get(tableName)))
                .sorted(Comparator.comparing(TableSchema::getSqlName))
                .collect(Collectors.toList());
        try {
            writeTableSchemas(tableSchemaList, outputFile, output);
        } catch (IOException e) {
            output.append(e.getClass().getSimpleName())
                    .append(" ")
                    .append(e.getMessage());
        }
    }