Examples with SqmJpaCompoundSelection org.hibernate.query.sqm.tree.select.SqmJpaCompoundSelection used on opensource projects

Example 1 with SqmJpaCompoundSelection

use of org.hibernate.query.sqm.tree.select.SqmJpaCompoundSelection in project hibernate-orm by hibernate.

the class BaseSqmToSqlAstConverter method visitSelection.

@Override
public Void visitSelection(SqmSelection<?> sqmSelection) {
    final List<Map.Entry<String, DomainResultProducer<?>>> resultProducers;
    final SqmSelectableNode<?> selectionNode = sqmSelection.getSelectableNode();
    if (selectionNode instanceof SqmJpaCompoundSelection<?>) {
        final SqmJpaCompoundSelection<?> selectableNode = (SqmJpaCompoundSelection<?>) selectionNode;
        resultProducers = new ArrayList<>(selectableNode.getSelectionItems().size());
        for (SqmSelectableNode<?> selectionItem : selectableNode.getSelectionItems()) {
            if (selectionItem instanceof SqmPath<?>) {
                prepareForSelection((SqmPath<?>) selectionItem);
            }
            resultProducers.add(new AbstractMap.SimpleEntry<>(selectionItem.getAlias(), (DomainResultProducer<?>) selectionItem.accept(this)));
        }
    } else {
        if (selectionNode instanceof SqmPath<?>) {
            prepareForSelection((SqmPath<?>) selectionNode);
        }
        resultProducers = Collections.singletonList(new AbstractMap.SimpleEntry<>(sqmSelection.getAlias(), (DomainResultProducer<?>) selectionNode.accept(this)));
    }
    final Stack<SqlAstProcessingState> processingStateStack = getProcessingStateStack();
    final boolean needsDomainResults = domainResults != null && currentClauseContributesToTopLevelSelectClause();
    final boolean collectDomainResults;
    if (processingStateStack.depth() == 1) {
        collectDomainResults = needsDomainResults;
    } else {
        final SqlAstProcessingState current = processingStateStack.getCurrent();
        // Since we only want to create domain results for the first/left-most query spec within query groups,
        // we have to check if the current query spec is the left-most.
        // This is the case when all upper level in-flight query groups are still empty
        collectDomainResults = needsDomainResults && processingStateStack.findCurrentFirst(processingState -> {
            if (!(processingState instanceof SqlAstQueryPartProcessingState)) {
                return Boolean.FALSE;
            }
            if (processingState == current) {
                return null;
            }
            final QueryPart part = ((SqlAstQueryPartProcessingState) processingState).getInflightQueryPart();
            if (part instanceof QueryGroup) {
                if (((QueryGroup) part).getQueryParts().isEmpty()) {
                    return null;
                }
            }
            return Boolean.FALSE;
        }) == null;
    }
    // arguments
    if (collectDomainResults) {
        resultProducers.forEach(entry -> {
            if (!(entry.getValue() instanceof DynamicInstantiation<?>)) {
                currentSqlSelectionCollector().next();
            }
            domainResults.add(entry.getValue().createDomainResult(entry.getKey(), this));
        });
    } else if (needsDomainResults) {
        // We just create domain results for the purpose of creating selections
        // This is necessary for top-level query specs within query groups to avoid cycles
        resultProducers.forEach(entry -> {
            if (!(entry.getValue() instanceof DynamicInstantiation<?>)) {
                currentSqlSelectionCollector().next();
            }
            entry.getValue().createDomainResult(entry.getKey(), this);
        });
    } else {
        resultProducers.forEach(entry -> {
            if (!(entry.getValue() instanceof DynamicInstantiation<?>)) {
                currentSqlSelectionCollector().next();
            }
            entry.getValue().applySqlSelections(this);
        });
    }
    return null;
}