/**
* 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.validator;
import org.structr.common.SecurityContext;
import org.structr.common.error.EmptyPropertyToken;
import org.structr.common.error.ErrorBuffer;
import org.structr.common.error.FrameworkException;
import org.structr.common.error.UniqueToken;
import org.structr.core.GraphObject;
import org.structr.core.PropertyValidator;
import org.structr.core.entity.AbstractNode;
import java.util.logging.Logger;
import org.structr.core.property.PropertyKey;
import org.structr.core.Result;
import org.structr.core.app.StructrApp;
//~--- classes ----------------------------------------------------------------
/**
* A validator that ensures global uniqueness for given entity type.
*
* @author Christian Morgner
*/
public class TypeUniquenessValidator<T> implements PropertyValidator<T> {
private static final Logger logger = Logger.getLogger(TypeUniquenessValidator.class.getName());
//~--- fields ---------------------------------------------------------
private Class type = null;
//~--- constructors ---------------------------------------------------
public TypeUniquenessValidator(Class type) {
this.type = type;
}
//~--- get methods ----------------------------------------------------
@Override
public boolean isValid(SecurityContext securityContext, GraphObject object, PropertyKey<T> key, T value, ErrorBuffer errorBuffer) {
if (value == null) {
errorBuffer.add(object.getType(), new EmptyPropertyToken(key));
return false;
}
if (!type.isAssignableFrom(object.getClass())) {
// types are different
return true;
}
if (key != null) {
boolean nodeExists = false;
String id = null;
Result<AbstractNode> result = null;
try {
result = StructrApp.getInstance().nodeQuery(type).and(key, value).getResult();
nodeExists = !result.isEmpty();
} catch (FrameworkException fex) {
fex.printStackTrace();
}
if (nodeExists) {
AbstractNode foundNode = result.get(0);
if (foundNode.getId() != object.getId()) {
id = ((AbstractNode) result.get(0)).getUuid();
errorBuffer.add(object.getType(), new UniqueToken(id, key, value));
return false;
}
}
}
return true;
}
@Override
public boolean requiresSynchronization() {
return true;
}
}