/*
* Copyright (C) 2003-2009 eXo Platform SAS.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.chromattic.core.jcr;
import org.chromattic.common.AbstractFilterIterator;
import org.chromattic.api.UndeclaredRepositoryException;
import javax.jcr.Session;
import javax.jcr.Node;
import javax.jcr.Property;
import javax.jcr.RepositoryException;
import javax.jcr.PropertyType;
import javax.jcr.ItemNotFoundException;
import javax.jcr.PropertyIterator;
import java.util.Iterator;
/**
* <p>The reference manager takes care of managing references between nodes. The main reason is that
* JCR reference management is a bit weird about the usage of <tt>Node#getReferences()</tt>. The goal
* of this class is to manage one to many relationships between nodes and their consistency.</p>
*
* <p>The life time of this object is valid from the beginning of the session until the session
* or a portion of the session is saved. When a session is saved, the clear operation will reset
* the state of the reference manager.</p>
*
* @author <a href="mailto:julien.viet@exoplatform.com">Julien Viet</a>
* @version $Revision$
*/
public class ReferenceLinkManager extends AbstractLinkManager {
public ReferenceLinkManager(Session session) {
super(session);
}
protected Node _getReferenced(Property property) throws RepositoryException {
if (property.getType() == PropertyType.REFERENCE) {
try {
return property.getNode();
}
catch (ItemNotFoundException e) {
// The node has been transiently removed or concurrently removed
return null;
}
} else {
// throw new MappingException("Property " + name + " is not mapped to a reference type");
// maybe issue a warn
return null;
}
}
protected void _setReferenced(Node referent, String propertyName, Node referenced) throws RepositoryException {
referent.setProperty(propertyName, referenced);
}
@SuppressWarnings("unchecked")
protected Iterator<Node> _getReferents(Node referenced, String propertyName) throws RepositoryException {
PropertyIterator bilto = referenced.getReferences();
return new AbstractFilterIterator<Node, Property>(bilto) {
protected Node adapt(Property property) {
try {
String propertyName = property.getName();
if (propertyName.equals(propertyName)) {
return property.getParent();
}
return null;
}
catch (RepositoryException e) {
throw new UndeclaredRepositoryException(e);
}
}
};
}
}