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interface PrinterReportParser {
    List<User, UserInfo> parse(string data);
}

class CanonE1220_Parser implements PrinterReportParser {
    List<User, UserInfo> parse(string data){
        return null;
    }
}

...

Map<string, PrinterReportParser> parsers;
for (Printer p in printers){
    PrinterReportParser parser = parsers[p.version];
    if (parser != null){
        parser.parse(p.getReport());
    } else {
        System.out.println("This printer version is not supported");
    }
}