001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.wicket.validation;
018
019import org.apache.wicket.util.io.IClusterable;
020
021/**
022 * Interface representing a validator that can validate an {@link IValidatable} object.
023 * <p>
024 * Unless the validator implements the {@link INullAcceptingValidator} interface as well, Wicket
025 * will not pass <code>null</code> values to the {@link IValidator#validate(IValidatable)} method.
026 * 
027 * @author Jonathan Locke
028 * @author Igor Vaynberg (ivaynberg)
029 * @param <T>
030 *            type of validatable value
031 * @since 1.2.6
032 */
033@FunctionalInterface
034public interface IValidator<T> extends IClusterable
035{
036        /**
037         * Validates the <code>IValidatable</code> instance. Validation errors should be reported using
038         * the {@link IValidatable#error(IValidationError)} method.
039         * 
040         * @param validatable
041         *            the <code>IValidatable</code> instance being validated
042         */
043        void validate(IValidatable<T> validatable);
044}