/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.wicket.validation;
import org.apache.wicket.markup.html.form.FormComponent;
/**
* Marker interface for validators that will accept a <code>null</code> value. Without implementing
* this interface Wicket will never pass <code>null</code> values to
* {@link IValidator#validate(IValidatable)}.
* <p>
* Keep in mind that the {@link FormComponent} must have set the required property to
* <code>false</code>, otherwise Wicket will not permit the validator to process the
* <code>null</code> value.
*
* @author Matej Knopp
* @param <T>
* type of validatable
* @since 1.2.6
* @see IValidator
* @see FormComponent#setRequired(boolean)
*/
public interface INullAcceptingValidator<T> extends IValidator<T>
{
}