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 019import org.apache.wicket.util.lang.Args; 020 021/** 022 * {@link IVisitFilter} that restricts visitors to only visiting objects of the specified class 023 * 024 * @author igor.vaynberg 025 */ 026public class ClassVisitFilter implements IVisitFilter 027{ 028 private final Class<?> clazz; 029 030 /** 031 * Constructor 032 * 033 * @param clazz 034 * class of objects that visitors should be restricted to 035 */ 036 public ClassVisitFilter(final Class<?> clazz) 037 { 038 Args.notNull(clazz, "clazz"); 039 040 this.clazz = clazz; 041 } 042 043 /** {@inheritDoc} */ 044 @Override 045 public boolean visitChildren(final Object object) 046 { 047 return true; 048 } 049 050 /** {@inheritDoc} */ 051 @Override 052 public boolean visitObject(final Object object) 053 { 054 return clazz.isAssignableFrom(object.getClass()); 055 } 056}