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.util.visit; 018 019/** 020 * Generic visitor interface for traversals. 021 * 022 * @param <T> 023 * type of object to be visited 024 * @param <R> 025 * type of value the visitor should return as the result of the visit/traversal 026 */ 027@FunctionalInterface 028public interface IVisitor<T, R> 029{ 030 /** 031 * Called at each object in a visit. 032 * 033 * @param object 034 * Object being visited 035 * @param visit 036 * Object used to control the visit/traversal 037 */ 038 void component(T object, IVisit<R> visit); 039}