001/* 002 * Copyright 2002-2019 the original author or authors. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * https://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016 017package org.springframework.aop; 018 019/** 020 * Filter that restricts matching of a pointcut or introduction to 021 * a given set of target classes. 022 * 023 * <p>Can be used as part of a {@link Pointcut} or for the entire 024 * targeting of an {@link IntroductionAdvisor}. 025 * 026 * <p>Concrete implementations of this interface typically should provide proper 027 * implementations of {@link Object#equals(Object)} and {@link Object#hashCode()} 028 * in order to allow the filter to be used in caching scenarios — for 029 * example, in proxies generated by CGLIB. 030 * 031 * @author Rod Johnson 032 * @see Pointcut 033 * @see MethodMatcher 034 */ 035@FunctionalInterface 036public interface ClassFilter { 037 038 /** 039 * Should the pointcut apply to the given interface or target class? 040 * @param clazz the candidate target class 041 * @return whether the advice should apply to the given target class 042 */ 043 boolean matches(Class<?> clazz); 044 045 046 /** 047 * Canonical instance of a ClassFilter that matches all classes. 048 */ 049 ClassFilter TRUE = TrueClassFilter.INSTANCE; 050 051}