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.aspectj; 018 019import org.aopalliance.aop.Advice; 020 021import org.springframework.aop.Advisor; 022import org.springframework.aop.AfterAdvice; 023import org.springframework.aop.BeforeAdvice; 024import org.springframework.lang.Nullable; 025 026/** 027 * Utility methods for dealing with AspectJ advisors. 028 * 029 * @author Adrian Colyer 030 * @author Juergen Hoeller 031 * @since 2.0 032 */ 033public abstract class AspectJAopUtils { 034 035 /** 036 * Return {@code true} if the advisor is a form of before advice. 037 */ 038 public static boolean isBeforeAdvice(Advisor anAdvisor) { 039 AspectJPrecedenceInformation precedenceInfo = getAspectJPrecedenceInformationFor(anAdvisor); 040 if (precedenceInfo != null) { 041 return precedenceInfo.isBeforeAdvice(); 042 } 043 return (anAdvisor.getAdvice() instanceof BeforeAdvice); 044 } 045 046 /** 047 * Return {@code true} if the advisor is a form of after advice. 048 */ 049 public static boolean isAfterAdvice(Advisor anAdvisor) { 050 AspectJPrecedenceInformation precedenceInfo = getAspectJPrecedenceInformationFor(anAdvisor); 051 if (precedenceInfo != null) { 052 return precedenceInfo.isAfterAdvice(); 053 } 054 return (anAdvisor.getAdvice() instanceof AfterAdvice); 055 } 056 057 /** 058 * Return the AspectJPrecedenceInformation provided by this advisor or its advice. 059 * If neither the advisor nor the advice have precedence information, this method 060 * will return {@code null}. 061 */ 062 @Nullable 063 public static AspectJPrecedenceInformation getAspectJPrecedenceInformationFor(Advisor anAdvisor) { 064 if (anAdvisor instanceof AspectJPrecedenceInformation) { 065 return (AspectJPrecedenceInformation) anAdvisor; 066 } 067 Advice advice = anAdvisor.getAdvice(); 068 if (advice instanceof AspectJPrecedenceInformation) { 069 return (AspectJPrecedenceInformation) advice; 070 } 071 return null; 072 } 073 074}