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* 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
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* KIND, either express or implied. See the License for the
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package org.apache.cayenne.access;
import java.util.Collection;
import java.util.HashSet;
import org.apache.cayenne.CayenneRuntimeException;
import org.apache.cayenne.ObjectId;
import org.apache.cayenne.graph.GraphChangeHandler;
import org.apache.cayenne.graph.GraphDiff;
import org.apache.cayenne.map.DbEntity;
import org.apache.cayenne.map.EntityResolver;
import org.apache.cayenne.map.ObjEntity;
import org.apache.cayenne.map.ObjRelationship;
/**
* A processor of ObjectStore indirect changes, such as flattened relationships
* and to-many relationships.
*
* @since 1.2
*/
final class DataDomainIndirectDiffBuilder implements GraphChangeHandler {
private final DataDomainFlushAction parent;
private final EntityResolver resolver;
private final Collection<ObjectId> indirectModifications;
private final Collection<FlattenedArcKey> flattenedInserts;
private final Collection<FlattenedArcKey> flattenedDeletes;
DataDomainIndirectDiffBuilder(DataDomainFlushAction parent) {
this.parent = parent;
this.indirectModifications = parent.getResultIndirectlyModifiedIds();
this.resolver = parent.getDomain().getEntityResolver();
this.flattenedInserts = new HashSet<>();
this.flattenedDeletes = new HashSet<>();
}
void processIndirectChanges(GraphDiff allChanges) {
// extract flattened and indirect changes and remove duplicate changes...
allChanges.apply(this);
if (!flattenedInserts.isEmpty()) {
for (final FlattenedArcKey key : flattenedInserts) {
DbEntity entity = key.getJoinEntity();
parent.addFlattenedInsert(entity, key);
}
}
if (!flattenedDeletes.isEmpty()) {
for (final FlattenedArcKey key : flattenedDeletes) {
DbEntity entity = key.getJoinEntity();
parent.addFlattenedDelete(entity, key);
}
}
}
@Override
public void arcCreated(Object nodeId, Object targetNodeId, Object arcId) {
ObjEntity entity = resolver.getObjEntity(((ObjectId) nodeId).getEntityName());
ObjRelationship relationship = entity.getRelationship(arcId.toString());
if (relationship.isSourceIndependentFromTargetChange()) {
ObjectId nodeObjectId = (ObjectId) nodeId;
if (!nodeObjectId.isTemporary()) {
indirectModifications.add(nodeObjectId);
}
if (relationship.isFlattened()) {
if (relationship.isReadOnly()) {
throw new CayenneRuntimeException("Cannot set the read-only flattened relationship '%s' in ObjEntity '%s'."
, relationship.getName(), relationship.getSourceEntity().getName());
}
// Register this combination (so we can remove it later if an insert occurs before commit)
FlattenedArcKey key = new FlattenedArcKey((ObjectId) nodeId, (ObjectId) targetNodeId, relationship);
// If this combination has already been deleted, simply undelete it.
if (!flattenedDeletes.remove(key)) {
flattenedInserts.add(key);
}
}
}
}
@Override
public void arcDeleted(Object nodeId, Object targetNodeId, Object arcId) {
ObjEntity entity = resolver.getObjEntity(((ObjectId) nodeId).getEntityName());
ObjRelationship relationship = entity.getRelationship(arcId.toString());
if (relationship.isSourceIndependentFromTargetChange()) {
// do not record temporary id mods...
ObjectId nodeObjectId = (ObjectId) nodeId;
if (!nodeObjectId.isTemporary()) {
indirectModifications.add(nodeObjectId);
}
if (relationship.isFlattened()) {
if (relationship.isReadOnly()) {
throw new CayenneRuntimeException("Cannot unset the read-only flattened relationship %s"
, relationship.getName());
}
// Register this combination (so we can remove it later if an insert occurs before commit)
FlattenedArcKey key = new FlattenedArcKey((ObjectId) nodeId, (ObjectId) targetNodeId, relationship);
// If this combination has already been inserted, simply "uninsert" it also do not delete it twice
if (!flattenedInserts.remove(key)) {
flattenedDeletes.add(key);
}
}
}
}
@Override
public void nodeIdChanged(Object nodeId, Object newId) {
// noop
}
@Override
public void nodeCreated(Object nodeId) {
// noop
}
@Override
public void nodeRemoved(Object nodeId) {
// noop
}
@Override
public void nodePropertyChanged(Object nodeId, String property, Object oldValue, Object newValue) {
// noop
}
}