Examples with RelationshipQuery org.apache.cayenne.query.RelationshipQuery used on opensource projects

Example 6 with RelationshipQuery

use of org.apache.cayenne.query.RelationshipQuery in project cayenne by apache.

the class ObjectContextQueryAction method interceptRelationshipQuery.

protected boolean interceptRelationshipQuery() {
    if (query instanceof RelationshipQuery) {
        RelationshipQuery relationshipQuery = (RelationshipQuery) query;
        if (!relationshipQuery.isRefreshing()) {
            if (targetContext == null && relationshipQuery.getRelationship(actingContext.getEntityResolver()).isToMany()) {
                return !DONE;
            }
            ObjectId id = relationshipQuery.getObjectId();
            Object object = actingContext.getGraphManager().getNode(id);
            if (object != null) {
                ClassDescriptor descriptor = actingContext.getEntityResolver().getClassDescriptor(id.getEntityName());
                if (!descriptor.isFault(object)) {
                    ArcProperty property = (ArcProperty) descriptor.getProperty(relationshipQuery.getRelationshipName());
                    if (!property.isFault(object)) {
                        Object related = property.readPropertyDirectly(object);
                        List result;
                        // null to-one
                        if (related == null) {
                            result = new ArrayList(1);
                        } else // to-many List
                        if (related instanceof List) {
                            result = (List) related;
                        } else // to-many Set
                        if (related instanceof Set) {
                            result = new ArrayList((Set) related);
                        } else // to-many Map
                        if (related instanceof Map) {
                            result = new ArrayList(((Map) related).values());
                        } else // non-null to-one
                        {
                            result = new ArrayList(1);
                            result.add(related);
                        }
                        this.response = new ListResponse(result);
                        return DONE;
                    }
                    /**
                     * Workaround for CAY-1183. If a Relationship query is being sent
                     * from child context, we assure that local object is not NEW and
                     * relationship - unresolved (this way exception will occur). This
                     * helps when faulting objects that were committed to parent
                     * context (this), but not to database. Checking type of context's
                     * channel is the only way to ensure that we are on the top level
                     * of context hierarchy (there might be more than one-level-deep
                     * nested contexts).
                     */
                    if (((Persistent) object).getPersistenceState() == PersistenceState.NEW && !(actingContext.getChannel() instanceof BaseContext)) {
                        this.response = new ListResponse();
                        return DONE;
                    }
                }
            }
        }
    }
    return !DONE;
}

Example 7 with RelationshipQuery

use of org.apache.cayenne.query.RelationshipQuery in project cayenne by apache.

the class RelationshipFault method resolveFromDB.

/**
 * Executes a query that returns related objects. Subclasses would invoke
 * this method whenever they need to resolve a fault.
 */
protected List<E> resolveFromDB() {
    // non-persistent objects shouldn't trigger a fetch
    if (isTransientParent()) {
        return new ArrayList<>();
    }
    List<E> resolved = relationshipOwner.getObjectContext().performQuery(new RelationshipQuery(relationshipOwner.getObjectId(), relationshipName, false));
    /*
         * Duplicating the list (see CAY-1194). Doing that only for
         * RelationshipFault query results, so only for nested DataContexts
         */
    if (resolved instanceof RelationshipFault) {
        resolved = new ArrayList<>(resolved);
    }
    // merge local before updating reverse to ensure we update reverse rels
    // of the right objects (see CAY-1757)
    mergeLocalChanges(resolved);
    if (resolved.isEmpty()) {
        return resolved;
    }
    updateReverse(resolved);
    return resolved;
}