Examples with EntityViewConfiguration com.blazebit.persistence.view.impl.EntityViewConfiguration used on opensource projects

Example 1 with EntityViewConfiguration

use of com.blazebit.persistence.view.impl.EntityViewConfiguration in project blaze-persistence by Blazebit.

the class AbstractCorrelatedSubselectTupleTransformer method prepare.

private void prepare() {
    JpaProvider jpaProvider = entityViewConfiguration.getCriteriaBuilder().getService(JpaProvider.class);
    FullQueryBuilder<?, ?> queryBuilder = entityViewConfiguration.getCriteriaBuilder();
    Map<String, Object> optionalParameters = entityViewConfiguration.getOptionalParameters();
    Class<?> correlationBasisEntityType = correlationBasisEntity;
    String viewRootExpression = viewRootAlias;
    EmbeddingViewJpqlMacro embeddingViewJpqlMacro = entityViewConfiguration.getEmbeddingViewJpqlMacro();
    ViewJpqlMacro viewJpqlMacro = entityViewConfiguration.getViewJpqlMacro();
    if (queryBuilder instanceof PaginatedCriteriaBuilder<?>) {
        criteriaBuilder = queryBuilder.copyCriteriaBuilder(Object[].class, false);
    } else {
        LimitBuilder<?> limitBuilder = (LimitBuilder<?>) queryBuilder;
        // To set the limit, we need the JPA provider to support this
        if (jpaProvider.supportsSubqueryInFunction() && (limitBuilder.getFirstResult() > 0 || limitBuilder.getMaxResults() < Integer.MAX_VALUE)) {
            // we must turn this query builder into a paginated criteria builder first
            try {
                criteriaBuilder = queryBuilder.copyCriteriaBuilder(Object[].class, true).page(limitBuilder.getFirstResult(), limitBuilder.getMaxResults()).copyCriteriaBuilder(Object[].class, false);
            } catch (IllegalStateException ex) {
                LOG.log(Level.WARNING, "Could not create a paginated criteria builder for SUBSELECT fetching which might lead to bad performance", ex);
                criteriaBuilder = queryBuilder.copyCriteriaBuilder(Object[].class, false);
            }
        } else {
            // Regular query without limit/offset
            criteriaBuilder = queryBuilder.copyCriteriaBuilder(Object[].class, false);
        }
    }
    int originalFirstResult = 0;
    int originalMaxResults = Integer.MAX_VALUE;
    // A copied query that is extended with further joins can't possibly use the limits provided by the outer query
    ((LimitBuilder<?>) criteriaBuilder).setFirstResult(originalFirstResult);
    ((LimitBuilder<?>) criteriaBuilder).setMaxResults(originalMaxResults);
    this.viewRootJpqlMacro = new CorrelatedSubqueryViewRootJpqlMacro(criteriaBuilder, optionalParameters, false, viewRootEntityClass, idAttributePath, viewRootExpression);
    criteriaBuilder.registerMacro("view", viewJpqlMacro);
    criteriaBuilder.registerMacro("view_root", viewRootJpqlMacro);
    criteriaBuilder.registerMacro("embedding_view", embeddingViewJpqlMacro);
    String oldViewPath = viewJpqlMacro.getViewPath();
    String oldEmbeddingViewPath = embeddingViewJpqlMacro.getEmbeddingViewPath();
    viewJpqlMacro.setViewPath(correlationResultExpression);
    embeddingViewJpqlMacro.setEmbeddingViewPath(embeddingViewPath);
    String joinBase = embeddingViewPath;
    SubqueryCorrelationBuilder correlationBuilder = new SubqueryCorrelationBuilder(queryBuilder, optionalParameters, criteriaBuilder, correlationAlias, correlationExternalAlias, correlationResultExpression, correlationBasisType, correlationBasisEntityType, joinBase, attributePath, 1, limiter, true);
    CorrelationProvider provider = correlationProviderFactory.create(entityViewConfiguration.getCriteriaBuilder(), entityViewConfiguration.getOptionalParameters());
    provider.applyCorrelation(correlationBuilder, correlationBasisExpression);
    if (criteriaBuilder instanceof LimitBuilder<?>) {
        if (originalFirstResult != ((LimitBuilder<?>) criteriaBuilder).getFirstResult() || originalMaxResults != ((LimitBuilder<?>) criteriaBuilder).getMaxResults()) {
            throw new IllegalArgumentException("Correlation provider '" + provider + "' wrongly uses setFirstResult() or setMaxResults() on the query builder which might lead to wrong results. Use SELECT fetching with batch size 1 or reformulate the correlation provider to use the limit/offset in a subquery!");
        }
    }
    if (fetches.length != 0) {
        for (int i = 0; i < fetches.length; i++) {
            criteriaBuilder.fetch(fetches[i]);
        }
    }
    if (indexFetches.length != 0) {
        for (int i = 0; i < indexFetches.length; i++) {
            criteriaBuilder.fetch(indexFetches[i]);
        }
    }
    // Before we can determine whether we use view roots or embedding views, we need to add all selects, otherwise macros might report false although they are used
    final String correlationRoot = correlationBuilder.getCorrelationRoot();
    final int tupleSuffix = maximumViewMapperCount + 1 + (indexCorrelator == null && indexExpression == null ? 0 : 1);
    ObjectBuilder<Object[]> objectBuilder = (ObjectBuilder<Object[]>) correlator.finish(criteriaBuilder, entityViewConfiguration, 0, tupleSuffix, correlationRoot, embeddingViewJpqlMacro, true);
    final boolean usesViewRoot = viewRootJpqlMacro.usesViewMacro();
    final boolean usesEmbeddingView = embeddingViewJpqlMacro.usesEmbeddingView();
    if (usesEmbeddingView && !(embeddingViewType instanceof ViewType<?>)) {
        throw new IllegalStateException("The use of EMBEDDING_VIEW in the correlation for '" + embeddingViewType.getJavaType().getName() + "." + attributePath.substring(attributePath.lastIndexOf('.') + 1) + "' is illegal because the embedding view type '" + embeddingViewType.getJavaType().getName() + "' does not declare a @IdMapping!");
    } else if (usesViewRoot && !(viewRootType instanceof ViewType<?>)) {
        throw new IllegalStateException("The use of VIEW_ROOT in the correlation for '" + embeddingViewType.getJavaType().getName() + "." + attributePath.substring(attributePath.lastIndexOf('.') + 1) + "' is illegal because the view root type '" + viewRootType.getJavaType().getName() + "' does not declare a @IdMapping!");
    }
    final int maximumSlotsFilled;
    final int elementKeyIndex;
    final int elementViewIndex;
    if (usesEmbeddingView) {
        maximumSlotsFilled = embeddingViewIdMapperCount == 0 ? 1 : embeddingViewIdMapperCount;
        elementKeyIndex = (maximumViewMapperCount - maximumSlotsFilled) + 2 + valueIndex;
        elementViewIndex = (maximumViewMapperCount - maximumSlotsFilled) + 1 + valueIndex;
        viewIndex = embeddingViewIndex;
    } else if (usesViewRoot) {
        maximumSlotsFilled = viewRootIdMapperCount == 0 ? 1 : viewRootIdMapperCount;
        elementKeyIndex = (maximumViewMapperCount - maximumSlotsFilled) + 2 + valueIndex;
        elementViewIndex = (maximumViewMapperCount - maximumSlotsFilled) + 1 + valueIndex;
        viewIndex = viewRootIndex;
    } else {
        maximumSlotsFilled = 0;
        elementKeyIndex = maximumViewMapperCount + 1 + valueIndex;
        elementViewIndex = 1 + valueIndex;
        viewIndex = -1;
    }
    for (int i = maximumSlotsFilled; i < maximumViewMapperCount; i++) {
        criteriaBuilder.select("NULL");
    }
    ExpressionFactory ef = criteriaBuilder.getService(ExpressionFactory.class);
    if (usesEmbeddingView) {
        EntityViewConfiguration configuration = new EntityViewConfiguration(criteriaBuilder, ef, new MutableViewJpqlMacro(), new MutableEmbeddingViewJpqlMacro(), Collections.<String, Object>emptyMap(), Collections.<String, Object>emptyMap(), entityViewConfiguration.getFetches(), attributePath);
        ObjectBuilder<Object[]> embeddingViewObjectBuilder = createViewAwareObjectBuilder(criteriaBuilder, embeddingViewType, configuration, embeddingViewIdExpression);
        if (embeddingViewObjectBuilder == null) {
            criteriaBuilder.select(embeddingViewIdExpression);
        } else {
            criteriaBuilder.selectNew(objectBuilder = new LateAdditionalObjectBuilder(objectBuilder, embeddingViewObjectBuilder, true));
        }
    } else if (usesViewRoot) {
        EntityViewConfiguration configuration = new EntityViewConfiguration(criteriaBuilder, ef, new MutableViewJpqlMacro(), new MutableEmbeddingViewJpqlMacro(), Collections.<String, Object>emptyMap(), Collections.<String, Object>emptyMap(), entityViewConfiguration.getFetches(), attributePath);
        ObjectBuilder<Object[]> viewRootObjectBuilder = createViewAwareObjectBuilder(criteriaBuilder, viewRootType, configuration, viewRootIdExpression);
        if (viewRootObjectBuilder == null) {
            criteriaBuilder.select(viewRootIdExpression);
        } else {
            criteriaBuilder.selectNew(objectBuilder = new LateAdditionalObjectBuilder(objectBuilder, viewRootObjectBuilder, true));
        }
    }
    criteriaBuilder.select(correlationKeyExpression);
    if (indexCorrelator != null) {
        ObjectBuilder<?> indexBuilder = indexCorrelator.finish(criteriaBuilder, entityViewConfiguration, maximumViewMapperCount + 2, 0, indexExpression, embeddingViewJpqlMacro, true);
        if (indexBuilder != null) {
            criteriaBuilder.selectNew(new LateAdditionalObjectBuilder(objectBuilder, indexBuilder, false));
        }
    }
    populateParameters(entityViewConfiguration, criteriaBuilder);
    viewJpqlMacro.setViewPath(oldViewPath);
    embeddingViewJpqlMacro.setEmbeddingViewPath(oldEmbeddingViewPath);
    List<Object[]> resultList = (List<Object[]>) criteriaBuilder.getResultList();
    Map<Object, Map<Object, Object>> collections = new HashMap<>(resultList.size());
    for (int i = 0; i < resultList.size(); i++) {
        Object[] element = resultList.get(i);
        Map<Object, Object> viewRootResult = collections.get(element[elementViewIndex]);
        if (viewRootResult == null) {
            viewRootResult = new HashMap<>();
            collections.put(element[elementViewIndex], viewRootResult);
        }
        if (this.containerAccumulator == null) {
            viewRootResult.put(element[elementKeyIndex], element[valueIndex]);
        } else {
            Object result = viewRootResult.get(element[elementKeyIndex]);
            if (result == null) {
                result = createDefaultResult();
                viewRootResult.put(element[elementKeyIndex], result);
            }
            Object indexObject = null;
            if (indexCorrelator != null || indexExpression != null) {
                indexObject = element[elementKeyIndex + 1];
            }
            this.containerAccumulator.add(result, indexObject, element[valueIndex], isRecording());
        }
    }
    this.collections = collections;
}

Example 2 with EntityViewConfiguration

use of com.blazebit.persistence.view.impl.EntityViewConfiguration in project blaze-persistence by Blazebit.

the class SubviewCorrelator method finish.

@Override
@SuppressWarnings({ "rawtypes", "unchecked" })
public ObjectBuilder<?> finish(FullQueryBuilder<?, ?> criteriaBuilder, EntityViewConfiguration entityViewConfiguration, int offset, int tupleSuffix, String correlationRoot, EmbeddingViewJpqlMacro embeddingViewJpqlMacro, boolean nullFlatViewIfEmpty) {
    EntityViewConfiguration subviewConfiguration = entityViewConfiguration.forSubview(criteriaBuilder, attributePath, embeddingViewJpqlMacro);
    ObjectBuilder builder = evm.createObjectBuilder(managedViewType, mappingConstructor, correlationRoot, attributePath, criteriaBuilder, subviewConfiguration, offset, tupleSuffix, nullFlatViewIfEmpty);
    criteriaBuilder.selectNew(builder);
    return builder;
}