001/* 002 * Copyright 2002-2016 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.core; 018 019/** 020 * Interface to be implemented by decorating proxies, in particular Spring AOP 021 * proxies but potentially also custom proxies with decorator semantics. 022 * 023 * <p>Note that this interface should just be implemented if the decorated class 024 * is not within the hierarchy of the proxy class to begin with. In particular, 025 * a "target-class" proxy such as a Spring AOP CGLIB proxy should not implement 026 * it since any lookup on the target class can simply be performed on the proxy 027 * class there anyway. 028 * 029 * <p>Defined in the core module in order to allow 030 * #{@link org.springframework.core.annotation.AnnotationAwareOrderComparator} 031 * (and potential other candidates without spring-aop dependencies) to use it 032 * for introspection purposes, in particular annotation lookups. 033 * 034 * @author Juergen Hoeller 035 * @since 4.3 036 */ 037public interface DecoratingProxy { 038 039 /** 040 * Return the (ultimate) decorated class behind this proxy. 041 * <p>In case of an AOP proxy, this will be the ultimate target class, 042 * not just the immediate target (in case of multiple nested proxies). 043 * @return the decorated class (never {@code null}) 044 */ 045 Class<?> getDecoratedClass(); 046 047}