Examples with PageableFieldValidator org.eclipse.persistence.jpa.rs.features.paging.PageableFieldValidator used on opensource projects

Example 1 with PageableFieldValidator

use of org.eclipse.persistence.jpa.rs.features.paging.PageableFieldValidator in project eclipselink by eclipse-ee4j.

the class AbstractEntityResource method findAttributeInternal.

protected Response findAttributeInternal(String version, String persistenceUnit, String type, String id, String attribute, HttpHeaders headers, UriInfo uriInfo) {
    JPARSLogger.entering(CLASS_NAME, "findAttributeInternal", new Object[] { "GET", version, persistenceUnit, type, id, attribute, uriInfo.getRequestUri().toASCIIString() });
    EntityManager em = null;
    try {
        PersistenceContext context = getPersistenceContext(persistenceUnit, type, uriInfo.getBaseUri(), version, null);
        Object entityId = IdHelper.buildId(context, type, id);
        em = context.getEmf().createEntityManager(getMatrixParameters(uriInfo, persistenceUnit));
        Object entity = em.find(context.getClass(type), entityId, getQueryParameters(uriInfo));
        DatabaseSession serverSession = context.getServerSession();
        ClassDescriptor descriptor = serverSession.getClassDescriptor(context.getClass(type));
        if (descriptor == null) {
            throw JPARSException.classOrClassDescriptorCouldNotBeFoundForEntity(type, persistenceUnit);
        }
        DatabaseMapping attributeMapping = descriptor.getMappingForAttributeName(attribute);
        if ((attributeMapping == null) || (entity == null)) {
            throw JPARSException.databaseMappingCouldNotBeFoundForEntityAttribute(attribute, type, id, persistenceUnit);
        }
        if (!attributeMapping.isCollectionMapping()) {
            Object result = attributeMapping.getRealAttributeValueFromAttribute(attributeMapping.getAttributeValueFromObject(entity), entity, (AbstractSession) serverSession);
            if (result == null) {
                JPARSLogger.error(context.getSessionLog(), "jpars_could_not_find_entity_for_attribute", new Object[] { attribute, type, id, persistenceUnit });
                throw JPARSException.attributeCouldNotBeFoundForEntity(attribute, type, id, persistenceUnit);
            }
            final FeatureResponseBuilder responseBuilder = context.getSupportedFeatureSet().getResponseBuilder(Feature.NO_PAGING);
            return findAttributeResponse(context, attribute, type, id, persistenceUnit, result, getQueryParameters(uriInfo), headers, uriInfo, responseBuilder, null);
        }
        ReadQuery query = (ReadQuery) ((((ForeignReferenceMapping) attributeMapping).getSelectionQuery()).clone());
        if (query == null) {
            throw JPARSException.selectionQueryForAttributeCouldNotBeFoundForEntity(attribute, type, id, persistenceUnit);
        }
        final FeatureSet featureSet = context.getSupportedFeatureSet();
        final AbstractSession clientSession = context.getClientSession(em);
        // Fields filtering
        FieldsFilter fieldsFilter = null;
        if (context.getSupportedFeatureSet().isSupported(Feature.FIELDS_FILTERING)) {
            final FieldsFilteringValidator fieldsFilteringValidator = new FieldsFilteringValidator(uriInfo);
            if (fieldsFilteringValidator.isFeatureApplicable()) {
                fieldsFilter = fieldsFilteringValidator.getFilter();
            }
        }
        // Pagination
        if (featureSet.isSupported(Feature.PAGING)) {
            final PageableFieldValidator validator = new PageableFieldValidator(entity.getClass(), attribute, uriInfo);
            if (validator.isFeatureApplicable()) {
                // Adding extra one to detect are there more rows or not. It will be removed later
                // on in response processor.
                query.setMaxRows(validator.getLimit() + validator.getOffset() + 1);
                query.setFirstResult(validator.getOffset());
                // We need to add limit and offset to query parameters because request builder reads it from there
                final Map<String, Object> queryParams = getQueryParameters(uriInfo);
                queryParams.put(QueryParameters.JPARS_PAGING_LIMIT, String.valueOf(validator.getLimit()));
                queryParams.put(QueryParameters.JPARS_PAGING_OFFSET, String.valueOf(validator.getOffset()));
                // check orderBy, and generate a warning if there is none
                checkOrderBy(context, query);
                final Object result = clientSession.executeQuery(query, descriptor.getObjectBuilder().buildRow(entity, clientSession, WriteType.INSERT));
                final FeatureResponseBuilder responseBuilder = context.getSupportedFeatureSet().getResponseBuilder(Feature.PAGING);
                return findAttributeResponse(context, attribute, type, id, persistenceUnit, result, queryParams, headers, uriInfo, responseBuilder, fieldsFilter);
            }
        }
        final Object result = clientSession.executeQuery(query, descriptor.getObjectBuilder().buildRow(entity, clientSession, WriteType.INSERT));
        final FeatureResponseBuilder responseBuilder = context.getSupportedFeatureSet().getResponseBuilder(Feature.NO_PAGING);
        return findAttributeResponse(context, attribute, type, id, persistenceUnit, result, getQueryParameters(uriInfo), headers, uriInfo, responseBuilder, fieldsFilter);
    } catch (Exception ex) {
        throw JPARSException.exceptionOccurred(ex);
    } finally {
        if (em != null) {
            if (em.isOpen()) {
                em.close();
            }
        }
    }
}