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public class PublisherCodePrefixedSequenceIdGenerator extends SequenceStyleGenerator {
     
    public static final String CODE_NUMBER_SEPARATOR_PARAMETER = "codeNumberSeparator";
    public static final String CODE_NUMBER_SEPARATOR_DEFAULT = "_";
     
    public static final String NUMBER_FORMAT_PARAMETER = "numberFormat";
    public static final String NUMBER_FORMAT_DEFAULT = "%05d";
     
    private String format;
     
    @Override
    public Serializable generate(SharedSessionContractImplementor session,
            Object object) throws HibernateException {
        return String.format(format, ((Book)object).getPublisher().getCode(), super.generate(session, object));
    }
     
    @Override
    public void configure(Type type, Properties params,
            ServiceRegistry serviceRegistry) throws MappingException {
        super.configure(LongType.INSTANCE, params, serviceRegistry);
        String codeNumberSeparator = ConfigurationHelper.getString(CODE_NUMBER_SEPARATOR_PARAMETER, params, CODE_NUMBER_SEPARATOR_DEFAULT);
        String numberFormat = ConfigurationHelper.getString(NUMBER_FORMAT_PARAMETER, params, NUMBER_FORMAT_DEFAULT).replace("%", "%2"); 
        this.format = "%1$s"+codeNumberSeparator+numberFormat; 
    } 
}