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* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
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package org.apache.cayenne.access;
import java.util.Collection;
import org.apache.cayenne.CayenneRuntimeException;
import org.apache.cayenne.DataRow;
import org.apache.cayenne.ObjectId;
import org.apache.cayenne.Persistent;
import org.apache.cayenne.graph.GraphManager;
import org.apache.cayenne.map.ObjEntity;
import org.apache.cayenne.reflect.ClassDescriptor;
/**
* A ParentAttachmentStrategy that extracts parent ObjectId from the joined columns in the
* child snapshot.
*/
class JoinedIdParentAttachementStrategy implements ParentAttachmentStrategy {
private String relatedIdPrefix;
private Collection<ObjEntity> sourceEntities;
private PrefetchProcessorNode node;
private GraphManager graphManager;
JoinedIdParentAttachementStrategy(GraphManager graphManager,
PrefetchProcessorNode node) {
ClassDescriptor parentDescriptor = ((PrefetchProcessorNode) node.getParent())
.getResolver()
.getDescriptor();
relatedIdPrefix = node
.getIncoming()
.getRelationship()
.getReverseDbRelationshipPath()
+ ".";
sourceEntities = parentDescriptor.getEntityInheritanceTree().allSubEntities();
this.node = node;
this.graphManager = graphManager;
}
public void linkToParent(DataRow row, Persistent object) {
Persistent parentObject = null;
for (ObjEntity entity : sourceEntities) {
if (entity.isAbstract()) {
continue;
}
ObjectId id = node.getResolver().createObjectId(row, entity, relatedIdPrefix);
if (id == null) {
throw new CayenneRuntimeException("Can't build ObjectId from row: %s, entity: %s, prefix: %s"
, row, entity.getName(), relatedIdPrefix);
}
parentObject = (Persistent) graphManager.getNode(id);
if (parentObject != null) {
break;
}
}
node.linkToParent(object, parentObject);
}
}