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.application;
018
019import org.apache.wicket.Component;
020import org.apache.wicket.markup.ComponentTag;
021
022/**
023 * Listener interface that receives messages when components render their tags. Useful for cross-cutting concerns that
024 * want to output tag attribute or otherwise modify component tags.
025 *
026 * @author Igor Vaynberg (ivaynberg)
027 */
028@FunctionalInterface
029public interface IOnComponentTagListener {
030        /**
031         * Called before Component#onComponentTag(ComponentTag)
032         *
033         * @param component
034         *      the component whose tag is being modified
035         * @param tag
036         *      the component tag being modified
037         */
038        void onComponentTag(Component component, ComponentTag tag);
039}