/*
* eGov suite of products aim to improve the internal efficiency,transparency,
* accountability and the service delivery of the government organizations.
*
* Copyright (C) <2015> eGovernments Foundation
*
* The updated version of eGov suite of products as by eGovernments Foundation
* is available at http://www.egovernments.org
*
* 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, either version 3 of the License, or
* any later version.
*
* 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, see http://www.gnu.org/licenses/ or
* http://www.gnu.org/licenses/gpl.html .
*
* In addition to the terms of the GPL license to be adhered to in using this
* program, the following additional terms are to be complied with:
*
* 1) All versions of this program, verbatim or modified must carry this
* Legal Notice.
*
* 2) Any misrepresentation of the origin of the material is prohibited. It
* is required that all modified versions of this material be marked in
* reasonable ways as different from the original version.
*
* 3) This license does not grant any rights to any user of the program
* with regards to rights under trademark law for use of the trade names
* or trademarks of eGovernments Foundation.
*
* In case of any queries, you can reach eGovernments Foundation at contact@egovernments.org.
*/
package org.egov.infra.persistence.validator;
import org.apache.commons.lang3.reflect.FieldUtils;
import org.egov.infra.exception.ApplicationRuntimeException;
import org.egov.infra.persistence.validator.annotation.Unique;
import org.hibernate.Criteria;
import org.hibernate.Session;
import org.hibernate.criterion.Projections;
import org.hibernate.criterion.Restrictions;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;
public class UniqueCheckValidator implements ConstraintValidator<Unique, Object> {
private Unique unique;
@PersistenceContext
private EntityManager entityManager;
@Override
public void initialize(final Unique unique) {
this.unique = unique;
}
@Override
public boolean isValid(final Object arg0, final ConstraintValidatorContext constraintValidatorContext) {
try {
final Number id = (Number) FieldUtils.readField(arg0, unique.id(), true);
boolean isValid = true;
for (final String fieldName : unique.fields())
if (!checkUnique(arg0, id, fieldName)) {
isValid = false;
if (unique.enableDfltMsg())
constraintValidatorContext.buildConstraintViolationWithTemplate(unique.message())
.addPropertyNode(fieldName)
.addConstraintViolation();
}
return isValid;
} catch (final IllegalAccessException e) {
throw new ApplicationRuntimeException("Error while validating unique key", e);
}
}
private boolean checkUnique(final Object arg0, final Number id, final String fieldName) throws IllegalAccessException {
final Criteria criteria = entityManager.unwrap(Session.class)
.createCriteria(unique.isSuperclass() ? arg0.getClass().getSuperclass() : arg0.getClass());
final Object fieldValue = FieldUtils.readField(arg0, fieldName, true);
if (fieldValue instanceof String)
criteria.add(Restrictions.eq(fieldName, fieldValue).ignoreCase());
else
criteria.add(Restrictions.eq(fieldName, fieldValue));
if (id != null)
criteria.add(Restrictions.ne(unique.id(), id));
return criteria.setProjection(Projections.id()).setMaxResults(1).uniqueResult() == null;
}
}