Examples with BiDirectionalFetch org.hibernate.sql.results.graph.BiDirectionalFetch used on opensource projects

Example 1 with BiDirectionalFetch

use of org.hibernate.sql.results.graph.BiDirectionalFetch in project hibernate-orm by hibernate.

the class LoaderSelectBuilder method createFetchableBiConsumer.

private BiConsumer<Fetchable, Boolean> createFetchableBiConsumer(FetchParent fetchParent, QuerySpec querySpec, LoaderSqlAstCreationState creationState, List<Fetch> fetches) {
    return (fetchable, isKeyFetchable) -> {
        final NavigablePath fetchablePath;
        if (isKeyFetchable) {
            final EntityIdentifierMapping identifierMapping;
            if (fetchParent instanceof BiDirectionalFetch) {
                final BiDirectionalFetch parentAsBiDirectionalFetch = (BiDirectionalFetch) fetchParent;
                final Fetchable biDirectionalFetchedMapping = parentAsBiDirectionalFetch.getFetchedMapping();
                if (biDirectionalFetchedMapping instanceof EntityValuedFetchable) {
                    identifierMapping = ((EntityValuedFetchable) biDirectionalFetchedMapping).getEntityMappingType().getIdentifierMapping();
                } else {
                    identifierMapping = null;
                }
            } else {
                final FetchableContainer fetchableContainer = fetchParent.getReferencedMappingContainer();
                if (fetchableContainer instanceof EntityValuedModelPart) {
                    final EntityValuedModelPart entityValuedModelPart = (EntityValuedModelPart) fetchableContainer;
                    identifierMapping = entityValuedModelPart.getEntityMappingType().getIdentifierMapping();
                } else {
                    identifierMapping = null;
                }
            }
            if (identifierMapping != null) {
                fetchablePath = new EntityIdentifierNavigablePath(fetchParent.getNavigablePath(), attributeName(identifierMapping));
            } else {
                fetchablePath = fetchParent.resolveNavigablePath(fetchable);
            }
        } else {
            fetchablePath = fetchParent.resolveNavigablePath(fetchable);
        }
        FetchTiming fetchTiming = fetchable.getMappedFetchOptions().getTiming();
        boolean joined = fetchable.getMappedFetchOptions().getStyle() == FetchStyle.JOIN;
        boolean explicitFetch = false;
        EntityGraphTraversalState.TraversalResult traversalResult = null;
        final boolean isFetchablePluralAttributeMapping = fetchable instanceof PluralAttributeMapping;
        if (!(fetchable instanceof CollectionPart)) {
            // 'entity graph' takes precedence over 'fetch profile'
            if (entityGraphTraversalState != null) {
                traversalResult = entityGraphTraversalState.traverse(fetchParent, fetchable, isKeyFetchable);
                fetchTiming = traversalResult.getFetchTiming();
                joined = traversalResult.isJoined();
                explicitFetch = true;
            } else if (loadQueryInfluencers.hasEnabledFetchProfiles()) {
                // There is no point in checking the fetch profile if it can't affect this fetchable
                if (fetchTiming != FetchTiming.IMMEDIATE || fetchable.incrementFetchDepth()) {
                    final String fetchableRole = fetchable.getNavigableRole().getFullPath();
                    for (String enabledFetchProfileName : loadQueryInfluencers.getEnabledFetchProfileNames()) {
                        final FetchProfile enabledFetchProfile = creationContext.getSessionFactory().getFetchProfile(enabledFetchProfileName);
                        final org.hibernate.engine.profile.Fetch profileFetch = enabledFetchProfile.getFetchByRole(fetchableRole);
                        if (profileFetch != null) {
                            fetchTiming = FetchTiming.IMMEDIATE;
                            joined = joined || profileFetch.getStyle() == org.hibernate.engine.profile.Fetch.Style.JOIN;
                            explicitFetch = true;
                        }
                    }
                }
            } else if (loadQueryInfluencers.getEnabledCascadingFetchProfile() != null) {
                final CascadeStyle cascadeStyle = ((AttributeMapping) fetchable).getAttributeMetadataAccess().resolveAttributeMetadata(fetchable.findContainingEntityMapping()).getCascadeStyle();
                final CascadingAction cascadingAction = loadQueryInfluencers.getEnabledCascadingFetchProfile().getCascadingAction();
                if (cascadeStyle == null || cascadeStyle.doCascade(cascadingAction)) {
                    fetchTiming = FetchTiming.IMMEDIATE;
                    // In 5.x the CascadeEntityJoinWalker only join fetched the first collection fetch
                    if (isFetchablePluralAttributeMapping) {
                        joined = !hasCollectionJoinFetches;
                    } else {
                        joined = true;
                    }
                }
            }
        }
        final String previousBagRole = currentBagRole;
        final String bagRole;
        if (isFetchablePluralAttributeMapping && ((PluralAttributeMapping) fetchable).getMappedType().getCollectionSemantics() instanceof BagSemantics) {
            bagRole = fetchable.getNavigableRole().getNavigableName();
        } else {
            bagRole = null;
        }
        if (joined && previousBagRole != null && bagRole != null) {
            // Avoid join fetching multiple bags
            joined = false;
        }
        boolean changeFetchDepth = !(fetchable instanceof BasicValuedModelPart) && !(fetchable instanceof EmbeddedAttributeMapping) && !(fetchable instanceof CollectionPart);
        try {
            if (changeFetchDepth) {
                fetchDepth++;
            }
            // There is no need to check for circular fetches if this is an explicit fetch
            if (!explicitFetch && !creationState.isResolvingCircularFetch()) {
                final Fetch biDirectionalFetch = fetchable.resolveCircularFetch(fetchablePath, fetchParent, fetchTiming, creationState);
                if (biDirectionalFetch != null) {
                    fetches.add(biDirectionalFetch);
                    return;
                }
            }
            final Integer maximumFetchDepth = creationContext.getMaximumFetchDepth();
            if (maximumFetchDepth != null) {
                if (fetchDepth == maximumFetchDepth + 1) {
                    joined = false;
                } else if (fetchDepth > maximumFetchDepth + 1) {
                    if (!(fetchable instanceof BasicValuedModelPart) && !(fetchable instanceof EmbeddedAttributeMapping)) {
                        return;
                    }
                }
            }
            if (joined) {
                // For join fetches we remember the currentBagRole so that we can avoid multiple bag fetches
                if (bagRole != null) {
                    currentBagRole = bagRole;
                }
            } else {
                // For non-join fetches, we reset the currentBagRole and set it to the previous value in the finally block
                currentBagRole = null;
            }
            final Fetch fetch = fetchParent.generateFetchableFetch(fetchable, fetchablePath, fetchTiming, joined, null, creationState);
            if (fetch.getTiming() == FetchTiming.IMMEDIATE && isFetchablePluralAttributeMapping) {
                final PluralAttributeMapping pluralAttributeMapping = (PluralAttributeMapping) fetchable;
                if (joined) {
                    hasCollectionJoinFetches = true;
                    final TableGroup joinTableGroup = creationState.getFromClauseAccess().getTableGroup(fetchablePath);
                    applyFiltering(querySpec, joinTableGroup, pluralAttributeMapping, creationState);
                    applyOrdering(querySpec, fetchablePath, pluralAttributeMapping, creationState);
                }
            }
            fetches.add(fetch);
        } finally {
            if (changeFetchDepth) {
                fetchDepth--;
            }
            // otherwise we could run into a multiple bag fetch situation
            if (!joined) {
                currentBagRole = previousBagRole;
            }
            if (entityGraphTraversalState != null && traversalResult != null) {
                entityGraphTraversalState.backtrack(traversalResult);
            }
        }
    };
}