Validate Ticket Dto Mapper

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In this lesson, we're going to create the DTOs and mappers that we need in order to implement our validate ticket endpoint.

Creating the Request DTO

The TicketValidationRequestDto is a simple data class that carries validation request information.

@Data
@AllArgsConstructor
@NoArgsConstructor
public class TicketValidationRequestDto {
  private UUID id;
  private TicketValidationMethod method;
}

The class has two fields:

An id field of type UUID which can represent either a QR code ID or a ticket ID
A method field of type TicketValidationMethod enum to specify the validation method

Creating the Response DTO

The TicketValidationResponseDto represents the result of a ticket validation attempt.

@Data
@AllArgsConstructor
@NoArgsConstructor
public class TicketValidationResponseDto {
  private UUID ticketId;
  private TicketValidationStatusEnum status;
}

This class contains:

A ticketId field to identify the validated ticket
A status field using TicketValidationStatusEnum to indicate the validation result

Implementing the Mapper

The TicketValidationMapper interface handles the conversion between domain objects and DTOs.

@Mapper(componentModel = "spring", unmappedTargetPolicy = ReportingPolicy.IGNORE)
public interface TicketValidationMapper {

  @Mapping(target = "ticketId", source = "ticket.id")
  TicketValidationResponseDto toTicketValidationResponseDto(TicketValidation ticketValidation);

}

The mapper has a single method that:

Takes a TicketValidation domain object as input
Maps it to a TicketValidationResponseDto
Uses @Mapping to specify that the ticketId field should come from ticket.id

Summary

Added TicketValidationRequestDto and TicketValidationResponseDto DTO classes
Added the mapping method toTicketValidationResponseDto to TicketValidationMapper