ConditionalRequiredValidator.java

/*
 * 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 2
 * 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 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

package net.rrm.ehour.ui.common.validator;

import org.apache.wicket.model.IModel;
import org.apache.wicket.validation.INullAcceptingValidator;
import org.apache.wicket.validation.IValidatable;
import org.apache.wicket.validation.ValidationError;

/**
 * Conditional required validator, field is only required when the model evaluates to true
 */

public class ConditionalRequiredValidator<T> implements INullAcceptingValidator<T> {
    private static final long serialVersionUID = 6633525281870496233L;
    private IModel<Boolean> conditionalModel;

    public ConditionalRequiredValidator(IModel<Boolean> conditionalModel) {
        this.conditionalModel = conditionalModel;
    }

    @Override
    public void validate(IValidatable<T> validatable) {
        boolean condition = conditionalModel.getObject();

        if ((!condition)
                && (validatable.getValue() == null
                || validatable.getValue().toString().trim() == null)) {
            validatable.error(new ValidationError().addKey("Required"));
        }
    }
}