/*
This file is part of Cyclos (www.cyclos.org).
A project of the Social Trade Organisation (www.socialtrade.org).
Cyclos 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 2 of the License, or
(at your option) any later version.
Cyclos 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 Cyclos; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package nl.strohalm.cyclos.utils.validation;
import org.apache.commons.lang.StringUtils;
import org.springframework.beans.factory.DisposableBean;
/**
* A validation for a property which should be a class name assignable to the given class
*
* @author luis
*/
public class InstanceOfValidation implements PropertyValidation {
private static final long serialVersionUID = 953633627172013154L;
private final Class<?> expectedType;
public InstanceOfValidation(final Class<?> expectedType) {
this.expectedType = expectedType;
}
@Override
public ValidationError validate(final Object object, final Object property, final Object value) {
final String className = (String) value;
if (StringUtils.isEmpty(className)) {
return null;
}
try {
final Class<?> type = Class.forName(className);
if (!expectedType.isAssignableFrom(type)) {
throw new Exception();
}
// Attempt to instantiate
final Object instance = type.newInstance();
// Make sure to dispose it if needed
if (instance instanceof DisposableBean) {
try {
((DisposableBean) instance).destroy();
} catch (final Exception e) {
// Ignore
}
}
return null;
} catch (final Exception e) {
return new ValidationError("errors.javaClass", expectedType.getName());
}
}
}