info.unterrainer.commons.httpserver.daos.SingleQueryBuilder Maven / Gradle / Ivy
package info.unterrainer.commons.httpserver.daos;
import java.util.List;
import java.util.Map;
import java.util.function.Function;
import javax.persistence.EntityManager;
import info.unterrainer.commons.rdbutils.Transactions;
import info.unterrainer.commons.rdbutils.entities.BasicJpa;
import lombok.Getter;
import lombok.RequiredArgsConstructor;
@RequiredArgsConstructor
public class SingleQueryBuilder
extends BasicQueryEntityManagerBuilder> {
@Getter
protected final BasicJpqlDao dao;
protected final Long id;
protected V withEntityManager(final Function func) {
if (entityManager == null)
return Transactions.withNewTransactionReturning(dao.emf, em -> func.apply(em));
return func.apply(entityManager);
}
/**
* Get the selected entity.
*
* @return the selected entity
*/
public P get() {
return withEntityManager(em -> {
List resultList = dao.coreDao
.getQuery(em, "o", null, "o.id = :id", Map.of("id", id), dao.type, null, false, null, readTenantIds)
.getResultList();
if (resultList.isEmpty())
return null;
return resultList.get(0);
});
}
/**
* Get the selected entity or throw an exception if it wasn't found.
*
* @return the selected entity
*/
public P getOrException() {
return withEntityManager(em -> dao.coreDao
.getQuery(em, "o", null, "o.id = :id", Map.of("id", id), dao.type, null, false, null, readTenantIds)
.getSingleResult());
}
/**
* Delete the selected entity.
*/
public void delete() {
withEntityManager(em -> {
dao.coreDao.delete(em, id, readTenantIds);
return null;
});
}
}