/**
* Copyright (C) 2010-2014 Morgner UG (haftungsbeschränkt)
*
* This file is part of Structr <http://structr.org>.
*
* Structr is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* Structr is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Structr. If not, see <http://www.gnu.org/licenses/>.
*/
package org.structr.core.graph;
import org.neo4j.graphdb.Node;
import org.neo4j.graphdb.Relationship;
import org.structr.common.error.FrameworkException;
import org.structr.core.GraphObject;
import org.structr.core.Transformation;
import org.structr.core.entity.AbstractRelationship;
//~--- JDK imports ------------------------------------------------------------
import java.util.Date;
import java.util.Map.Entry;
import java.util.logging.Logger;
import org.structr.core.app.StructrApp;
import org.structr.core.entity.Relation;
import org.structr.core.property.PropertyKey;
import org.structr.core.property.PropertyMap;
//~--- classes ----------------------------------------------------------------
/**
* Creates a relationship between two NodeInterface instances. The execute
* method of this command takes the following parameters.
*
* @author cmorgner
*/
public class CreateRelationshipCommand extends NodeServiceCommand {
private static final Logger logger = Logger.getLogger(CreateRelationshipCommand.class.getName());
//~--- methods --------------------------------------------------------
public <A extends NodeInterface, B extends NodeInterface, R extends Relation<A, B, ?, ?>> R execute(final A fromNode, final B toNode, final Class<R> relType) throws FrameworkException {
return createRelationship(fromNode, toNode, relType, null);
}
public <A extends NodeInterface, B extends NodeInterface, R extends Relation<A, B, ?, ?>> R execute(final A fromNode, final B toNode, final Class<R> relType, final PropertyMap properties) throws FrameworkException {
return createRelationship(fromNode, toNode, relType, properties);
}
private synchronized <A extends NodeInterface, B extends NodeInterface, R extends Relation<A, B, ?, ?>> R createRelationship(final A fromNode, final B toNode, final Class<R> relType, final PropertyMap properties) throws FrameworkException {
final RelationshipFactory<R> factory = new RelationshipFactory(securityContext);
final R template = instantiate(relType);
final Node startNode = fromNode.getNode();
final Node endNode = toNode.getNode();
final Relationship rel = startNode.createRelationshipTo(endNode, template);
final R newRel = factory.instantiate(rel);
final Date now = new Date();
// logger.log(Level.INFO, "CREATING relationship {0}-[{1}]->{2}", new Object[] { fromNode.getType(), newRel.getRelType(), toNode.getType() } );
if (newRel != null) {
newRel.unlockReadOnlyPropertiesOnce();
newRel.setProperty(GraphObject.type, relType.getSimpleName());
// set UUID
newRel.unlockReadOnlyPropertiesOnce();
newRel.setProperty(GraphObject.id, getNextUuid());
// set created date
newRel.unlockReadOnlyPropertiesOnce();
newRel.setProperty(AbstractRelationship.createdDate, now);
// set last modified date
newRel.unlockReadOnlyPropertiesOnce();
newRel.setProperty(AbstractRelationship.lastModifiedDate, now);
// Try to get the cascading delete flag from the domain specific relationship type
newRel.unlockReadOnlyPropertiesOnce();
newRel.setProperty(AbstractRelationship.cascadeDelete, factory.instantiate(rel).getCascadingDeleteFlag());
// notify transaction handler
TransactionCommand.relationshipCreated(newRel);
if (properties != null) {
for (Entry<PropertyKey, Object> entry : properties.entrySet()) {
PropertyKey key = entry.getKey();
// on creation, writing of read-only properties should be possible
if (key.isReadOnly() || key.isWriteOnce()) {
newRel.unlockReadOnlyPropertiesOnce();
}
newRel.setProperty(entry.getKey(), entry.getValue());
}
}
// notify relationship of its creation
newRel.onRelationshipCreation();
// iterate post creation transformations
for (Transformation<GraphObject> transformation : StructrApp.getConfiguration().getEntityCreationTransformations(newRel.getClass())) {
transformation.apply(securityContext, newRel);
}
}
return newRel;
}
private <T extends Relation> T instantiate(final Class<T> type) {
try {
return type.newInstance();
} catch(Throwable t) {
t.printStackTrace();
}
return null;
}
}