Examples with ClassDescriptor org.apache.cayenne.reflect.ClassDescriptor used on opensource projects

Example 26 with ClassDescriptor

use of org.apache.cayenne.reflect.ClassDescriptor in project cayenne by apache.

the class PrefetchProcessorTreeBuilder method addNode.

boolean addNode(PrefetchProcessorNode node) {
    List<DataRow> rows;
    ArcProperty arc;
    ClassDescriptor descriptor;
    PrefetchProcessorNode currentNode = getParent();
    if (currentNode != null) {
        @SuppressWarnings("unchecked") List<DataRow> dataRows = (List<DataRow>) extraResultsByPath.get(node.getPath());
        rows = dataRows;
        arc = (ArcProperty) currentNode.getResolver().getDescriptor().getProperty(node.getName());
        if (arc == null) {
            throw new CayenneRuntimeException("No relationship with name '%s' found in entity '%s'", node.getName(), currentNode.getResolver().getEntity().getName());
        }
        descriptor = arc.getTargetDescriptor();
    } else {
        arc = null;
        if (this.descriptor != null) {
            descriptor = this.descriptor;
        } else {
            descriptor = queryMetadata.getClassDescriptor();
        }
        rows = mainResultRows;
    }
    node.setDataRows(rows);
    node.setIncoming(arc);
    if (node.getParent() != null && !node.isJointPrefetch()) {
        node.setResolver(new HierarchicalObjectResolverNode(node, context, descriptor, queryMetadata.isRefreshingObjects(), seen));
    } else {
        node.setResolver(new PrefetchObjectResolver(context, descriptor, queryMetadata.isRefreshingObjects(), seen));
    }
    if (node.getParent() == null || node.getParent().isPhantom()) {
        node.setParentAttachmentStrategy(new NoopParentAttachmentStrategy());
    } else if (node.isJointPrefetch()) {
        node.setParentAttachmentStrategy(new StackLookupParentAttachmentStrategy(node));
    } else if (node.getIncoming().getRelationship().isSourceIndependentFromTargetChange()) {
        node.setParentAttachmentStrategy(new JoinedIdParentAttachementStrategy(context.getGraphManager(), node));
    } else {
        node.setParentAttachmentStrategy(new ResultScanParentAttachmentStrategy(node));
    }
    if (currentNode != null) {
        currentNode.addChild(node);
    }
    node.afterInit();
    // push node on stack
    if (nodeStack.isEmpty()) {
        root = node;
    }
    nodeStack.addLast(node);
    return true;
}

Example 27 with ClassDescriptor

use of org.apache.cayenne.reflect.ClassDescriptor in project cayenne by apache.

the class HierarchicalObjectResolverNode method objectsFromDataRows.

@Override
List<Persistent> objectsFromDataRows(List<? extends DataRow> rows) {
    if (rows == null || rows.size() == 0) {
        return new ArrayList<>(1);
    }
    List<Persistent> results = new ArrayList<>(rows.size());
    for (DataRow row : rows) {
        // determine entity to use
        ClassDescriptor classDescriptor = descriptorResolutionStrategy.descriptorForRow(row);
        // not using DataRow.createObjectId for performance reasons -
        // ObjectResolver
        // has all needed metadata already cached.
        ObjectId anId = createObjectId(row, classDescriptor.getEntity(), null);
        Persistent object = objectFromDataRow(row, anId, classDescriptor);
        if (object == null) {
            throw new CayenneRuntimeException("Can't build Object from row: %s", row);
        }
        // keep the dupe objects (and data rows) around, as there maybe an
        // attached
        // joint prefetch...
        results.add(object);
        node.getParentAttachmentStrategy().linkToParent(row, object);
    }
    // now deal with snapshots
    // TODO: refactoring: dupes will clutter the lists and cause extra
    // processing...
    // removal of dupes happens only downstream, as we need the objects
    // matching
    // fetched rows for joint prefetch resolving... maybe pushback unique
    // and
    // non-unique lists to the "node", instead of returning a single list
    // from this
    // method
    cache.snapshotsUpdatedForObjects(results, rows, refreshObjects);
    return results;
}

Example 28 with ClassDescriptor

use of org.apache.cayenne.reflect.ClassDescriptor in project cayenne by apache.

the class RelationshipQuery method updateMetadata.

void updateMetadata(EntityResolver resolver) {
    // caching metadata as it may be accessed multiple times (at a DC and DD level)
    if (metadataResolver != resolver) {
        if (objectId == null) {
            throw new CayenneRuntimeException("Can't resolve query - objectID is null.");
        }
        ClassDescriptor descriptor = resolver.getClassDescriptor(objectId.getEntityName());
        this.arc = (ArcProperty) descriptor.getProperty(relationshipName);
        if (arc == null) {
            throw new CayenneRuntimeException("No relationship named %s found in entity %s; object id: %s", relationshipName, objectId.getEntityName(), objectId);
        }
        this.metadata = new DefaultQueryMetadata() {

            @Override
            public boolean isRefreshingObjects() {
                return refreshing;
            }

            @Override
            public ObjEntity getObjEntity() {
                return arc.getTargetDescriptor().getEntity();
            }

            @Override
            public ClassDescriptor getClassDescriptor() {
                return arc.getTargetDescriptor();
            }

            @Override
            public int getStatementFetchSize() {
                return statementFetchSize;
            }
        };
        this.metadataResolver = resolver;
    }
}

Example 29 with ClassDescriptor

use of org.apache.cayenne.reflect.ClassDescriptor in project cayenne by apache.

the class DataRowUtilsIT method testMerge.

@Test
public void testMerge() throws Exception {
    createOneArtist();
    String n1 = "changed";
    String n2 = "changed again";
    Artist a1 = ObjectSelect.query(Artist.class).select(context).get(0);
    a1.setArtistName(n1);
    DataRow s2 = new DataRow(2);
    s2.put("ARTIST_NAME", n2);
    s2.put("DATE_OF_BIRTH", new java.util.Date());
    ClassDescriptor d = context.getEntityResolver().getClassDescriptor("Artist");
    DataRowUtils.mergeObjectWithSnapshot(context, d, a1, s2);
    // name was modified, so it should not change during merge
    assertEquals(n1, a1.getArtistName());
    // date of birth came from database, it should be updated during merge
    assertEquals(s2.get("DATE_OF_BIRTH"), a1.getDateOfBirth());
}

Example 30 with ClassDescriptor

use of org.apache.cayenne.reflect.ClassDescriptor in project cayenne by apache.

the class CayenneContext method newObject.

/**
 * Creates and registers a new Persistent object instance.
 */
@Override
public <T> T newObject(Class<T> persistentClass) {
    if (persistentClass == null) {
        throw new NullPointerException("Persistent class can't be null.");
    }
    ObjEntity entity = getEntityResolver().getObjEntity(persistentClass);
    if (entity == null) {
        throw new CayenneRuntimeException("No entity mapped for class: %s", persistentClass);
    }
    ClassDescriptor descriptor = getEntityResolver().getClassDescriptor(entity.getName());
    @SuppressWarnings("unchecked") T object = (T) descriptor.createObject();
    descriptor.injectValueHolders(object);
    registerNewObject((Persistent) object, entity.getName(), descriptor);
    return object;
}