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.bean.validation; 018 019import java.lang.annotation.Annotation; 020 021import javax.validation.constraints.Size; 022 023import org.apache.wicket.markup.ComponentTag; 024import org.apache.wicket.markup.html.form.FormComponent; 025 026/** 027 * An object that can modify a component's markup tag during render based on values of a constraint 028 * annotation. An example would be a modifier that adds the {@code maxlen} attribute to the tag 029 * given a {@link Size} annotation. 030 * 031 * @author igor 032 * 033 */ 034@FunctionalInterface 035public interface ITagModifier<T extends Annotation> 036{ 037 /** 038 * Modify the tag 039 * 040 * @param component 041 * component the tag belongs to 042 * @param tag 043 * markup tag to be modified 044 * @param annotation 045 * constraint annotation 046 */ 047 void modify(FormComponent<?> component, ComponentTag tag, T annotation); 048 049 ITagModifier<?> NO_OP = (component, tag, annotation) -> { 050 }; 051}