Package io.github.marcopaglio.booking.repository.postgres

Class ReservationPostgresRepository

java.lang.Object

io.github.marcopaglio.booking.repository.postgres.ReservationPostgresRepository

All Implemented Interfaces:

ReservationRepository

public class ReservationPostgresRepository
extends Object
implements ReservationRepository

Implementation of repository layer through PostgreSQL for Reservation entities of the booking application.

Constructor Summary

Constructors

Constructor	Description
ReservationPostgresRepository(jakarta.persistence.EntityManager em)	Constructs a repository layer for Reservation entities using PostgreSQL database.

Method Summary

Modifier and Type	Method	Description
void	delete(Reservation reservation)	Removes the unique specified reservation from the PostgreSQL database, if it exists, otherwise it does nothing.
List<Reservation>	findAll()	Retrieves all the reservations from the PostgreSQL database in a list.
List<Reservation>	findByClient(UUID clientId)	Retrieves all the reservations associated with the specified client's identifier from the PostgreSQL database in a list.
Optional<Reservation>	findByDate(LocalDate date)	Retrieves the unique reservation of the specified date from the PostgreSQL database, if it exists.
Optional<Reservation>	findById(UUID id)	Retrieves the unique reservation with the specified identifier from the PostgreSQL database, if it exists.
Reservation	save(Reservation reservation)	Insert a new reservation in the PostgreSQL database or saves changes of an existing one.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

ReservationPostgresRepository

public ReservationPostgresRepository(jakarta.persistence.EntityManager em)

Constructs a repository layer for Reservation entities using PostgreSQL database.

Parameters:

em - the EntityManager used to communicate with PostgreSQL database.

Method Details

findAll

public List<Reservation> findAll()

Retrieves all the reservations from the PostgreSQL database in a list.

Specified by:

findAll in interface ReservationRepository

Returns:

the List of Reservations found in the repository.

findByClient

public List<Reservation> findByClient(UUID clientId)

Retrieves all the reservations associated with the specified client's identifier from the PostgreSQL database in a list.

Specified by:

findByClient in interface ReservationRepository

Parameters:

clientId - the identifier of the associated client.

Returns:

the List of Reservations associated with clientId found in the repository.

findById

public Optional<Reservation> findById(UUID id)

Retrieves the unique reservation with the specified identifier from the PostgreSQL database, if it exists.

Specified by:

findById in interface ReservationRepository

Parameters:

id - the identifier of the reservation to find.

Returns:

an Optional contained the Reservation identified by id, if it exists; an Optional empty, otherwise.

findByDate

public Optional<Reservation> findByDate(LocalDate date)

Retrieves the unique reservation of the specified date from the PostgreSQL database, if it exists.

Specified by:

findByDate in interface ReservationRepository

Parameters:

date - the date of the reservation to find.

Returns:

an Optional contained the Reservation on date, if it exists; an Optional empty, otherwise.

save

public Reservation save(Reservation reservation)
                 throws IllegalArgumentException,
UpdateFailureException,
NotNullConstraintViolationException,
UniquenessConstraintViolationException

Insert a new reservation in the PostgreSQL database or saves changes of an existing one. Note: a Reservation without an identifier is considered to be entered, while with the identifier it will be updated.

Specified by:

save in interface ReservationRepository

Parameters:

reservation - the reservation to save.

Returns:

the Reservation saved.

Throws:

IllegalArgumentException - if reservation is null.

UpdateFailureException - if you try to save changes of a no longer existing reservation.

NotNullConstraintViolationException - if date or clientId of reservation to save are null.

UniquenessConstraintViolationException - if id or date of reservation to save are already present.

delete

public void delete(Reservation reservation)
            throws IllegalArgumentException

Removes the unique specified reservation from the PostgreSQL database, if it exists, otherwise it does nothing. Note: this method must be executed as part of a transaction.

Specified by:

delete in interface ReservationRepository

Parameters:

reservation - the reservation to delete.

Throws:

IllegalArgumentException - if reservation is null.