001/* 002 * Copyright 2002-2012 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 019import org.aopalliance.aop.Advice; 020 021/** 022 * Subinterface of AOP Alliance Advice that allows additional interfaces 023 * to be implemented by an Advice, and available via a proxy using that 024 * interceptor. This is a fundamental AOP concept called <b>introduction</b>. 025 * 026 * <p>Introductions are often <b>mixins</b>, enabling the building of composite 027 * objects that can achieve many of the goals of multiple inheritance in Java. 028 * 029 * <p>Compared to {qlink IntroductionInfo}, this interface allows an advice to 030 * implement a range of interfaces that is not necessarily known in advance. 031 * Thus an {@link IntroductionAdvisor} can be used to specify which interfaces 032 * will be exposed in an advised object. 033 * 034 * @author Rod Johnson 035 * @since 1.1.1 036 * @see IntroductionInfo 037 * @see IntroductionAdvisor 038 */ 039public interface DynamicIntroductionAdvice extends Advice { 040 041 /** 042 * Does this introduction advice implement the given interface? 043 * @param intf the interface to check 044 * @return whether the advice implements the specified interface 045 */ 046 boolean implementsInterface(Class<?> intf); 047 048}