/*
* RHQ Management Platform
* Copyright (C) 2005-2011 Red Hat, Inc.
* All rights reserved.
*
* This program 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 version 2 of the License.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
package org.rhq.enterprise.server.sync.validators;
import java.util.HashSet;
import java.util.Set;
import javax.persistence.EntityManager;
import org.rhq.core.domain.auth.Subject;
import org.rhq.enterprise.server.sync.ValidationException;
/**
* This validator merely checks that there are no duplicates in the export file.
*
* @author Lukas Krejci
*/
public class UniquenessValidator<T> implements EntityValidator<T> {
private Set<T> alreadyCheckedEntities;
@Override
public void initialize(Subject subject, EntityManager entityManager) {
alreadyCheckedEntities = new HashSet<T>();
}
@Override
public void validateExportedEntity(T entity) throws ValidationException {
if (!alreadyCheckedEntities.add(entity)) {
throw new ValidationException("Was the export file manually updated? The entity " + entity + " has been seen multiple times.");
}
}
}