FieldsNotEqualValidator.java

/**
 *  C-Nery - A home automation web application for C-Bus.
 *  Copyright (C) 2008,2009,2012  Dave Oxley <dave@daveoxley.co.uk>.
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Affero General Public License as
 *  published by the Free Software Foundation, either version 3 of the
 *  License, or (at your option) 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 Affero General Public License for more details.
 *
 *  You should have received a copy of the GNU Affero General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

package com.daveoxley.cnery.constraints.impl;

import com.daveoxley.cnery.constraints.FieldsNotEqual;
import com.daveoxley.cnery.entities.Scene;
import com.daveoxley.cnery.entities.SceneAction;
import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;
import org.apache.commons.beanutils.PropertyUtils;

/**
 *
 * @author Dave Oxley <dave@daveoxley.co.uk>
 */
public class FieldsNotEqualValidator implements ConstraintValidator<FieldsNotEqual, Object>
{
    private String firstFieldName;
    private String secondFieldName;

    @Override
    public void initialize(final FieldsNotEqual constraintAnnotation)
    {
        firstFieldName = constraintAnnotation.first();
        secondFieldName = constraintAnnotation.second();
    }

    @Override
    public boolean isValid(final Object value, final ConstraintValidatorContext context)
    {
        try
        {
            final Object first = PropertyUtils.getProperty(value, firstFieldName);
            final Object second = PropertyUtils.getProperty(value, secondFieldName);

            boolean equal = first == null && second == null || first != null && first.equals(second);

            return !equal;
        }
        catch (final Exception ignore)
        {
            // ignore
        }
        return true;
    }
}