Examples with AttributeFault org.apache.cayenne.access.AttributeFault used on opensource projects

Example 1 with AttributeFault

use of org.apache.cayenne.access.AttributeFault in project cayenne by apache.

the class ObjectDetachOperation method detach.

/**
 * "Detaches" an object from its context by creating an unattached copy. The copy is
 * created using target descriptor of this operation that may be different from the
 * object descriptor passed to this method.
 */
public Object detach(Object object, ClassDescriptor descriptor, final PrefetchTreeNode prefetchTree) {
    if (!(object instanceof Persistent)) {
        throw new CayenneRuntimeException("Expected Persistent, got: %s", object);
    }
    final Persistent source = (Persistent) object;
    ObjectId id = source.getObjectId();
    // sanity check
    if (id == null) {
        throw new CayenneRuntimeException("Server returned an object without an id: %s", source);
    }
    Object seenTarget = seen.get(id);
    if (seenTarget != null) {
        return seenTarget;
    }
    descriptor = descriptor.getSubclassDescriptor(source.getClass());
    // presumably id's entity name should be of the right subclass.
    final ClassDescriptor targetDescriptor = targetResolver.getClassDescriptor(id.getEntityName());
    final Persistent target = (Persistent) targetDescriptor.createObject();
    target.setObjectId(id);
    seen.put(id, target);
    descriptor.visitProperties(new PropertyVisitor() {

        private void fillReverseRelationship(Object destinationTarget, ArcProperty property) {
            ArcProperty clientProperty = (ArcProperty) targetDescriptor.getProperty(property.getName());
            if (clientProperty != null) {
                ArcProperty clientReverse = clientProperty.getComplimentaryReverseArc();
                if (clientReverse instanceof ToOneProperty) {
                    clientReverse.writeProperty(destinationTarget, null, target);
                }
            }
        }

        public boolean visitToOne(ToOneProperty property) {
            if (prefetchTree != null) {
                PrefetchTreeNode child = prefetchTree.getNode(property.getName());
                if (child != null) {
                    Object destinationSource = property.readProperty(source);
                    Object destinationTarget = destinationSource != null ? detach(destinationSource, property.getTargetDescriptor(), child) : null;
                    if (destinationTarget != null) {
                        fillReverseRelationship(destinationTarget, property);
                    }
                    ToOneProperty targetProperty = (ToOneProperty) targetDescriptor.getProperty(property.getName());
                    Object oldTarget = targetProperty.isFault(target) ? null : targetProperty.readProperty(target);
                    targetProperty.writeProperty(target, oldTarget, destinationTarget);
                }
            }
            return true;
        }

        public boolean visitToMany(ToManyProperty property) {
            if (prefetchTree != null) {
                PrefetchTreeNode child = prefetchTree.getNode(property.getName());
                if (child != null) {
                    Object value = property.readProperty(source);
                    Object targetValue;
                    if (property instanceof ToManyMapProperty) {
                        Map<?, ?> map = (Map) value;
                        Map targetMap = new HashMap();
                        for (Entry entry : map.entrySet()) {
                            Object destinationSource = entry.getValue();
                            Object destinationTarget = destinationSource != null ? detach(destinationSource, property.getTargetDescriptor(), child) : null;
                            if (destinationTarget != null) {
                                fillReverseRelationship(destinationTarget, property);
                            }
                            targetMap.put(entry.getKey(), destinationTarget);
                        }
                        targetValue = targetMap;
                    } else {
                        Collection collection = (Collection) value;
                        Collection targetCollection = new ArrayList(collection.size());
                        for (Object destinationSource : collection) {
                            Object destinationTarget = destinationSource != null ? detach(destinationSource, property.getTargetDescriptor(), child) : null;
                            if (destinationTarget != null) {
                                fillReverseRelationship(destinationTarget, property);
                            }
                            targetCollection.add(destinationTarget);
                        }
                        targetValue = targetCollection;
                    }
                    ToManyProperty targetProperty = (ToManyProperty) targetDescriptor.getProperty(property.getName());
                    targetProperty.writeProperty(target, null, targetValue);
                }
            }
            return true;
        }

        public boolean visitAttribute(AttributeProperty property) {
            PropertyDescriptor targetProperty = targetDescriptor.getProperty(property.getName());
            if (!property.getAttribute().isLazy()) {
                targetProperty.writeProperty(target, null, property.readProperty(source));
            } else {
                targetProperty.writeProperty(target, null, new AttributeFault(property));
            }
            return true;
        }
    });
    return target;
}