aspectjaoputils.java

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/*
 * Copyright 2002-2006 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * Created on 15-Feb-2006 by Adrian Colyer
 */

package org.springframework.aop.aspectj;

import org.aopalliance.aop.Advice;

import org.springframework.aop.Advisor;
import org.springframework.aop.AfterReturningAdvice;
import org.springframework.aop.BeforeAdvice;
import org.springframework.aop.ThrowsAdvice;
import org.springframework.aop.framework.adapter.AfterReturningAdviceInterceptor;
import org.springframework.aop.framework.adapter.ThrowsAdviceInterceptor;

/**
 * @author Adrian Colyer
 * @since 2.0
 */
public abstract class AspectJAopUtils {

	/**
	 * Return true if the advisor is a form of after advice.
	 * TODO: listing all of these implementation types here has a bad
	 * smell to it...
	 */
	public static boolean isAfterAdvice(Advisor anAdvisor) {
		AspectJPrecedenceInformation precedenceInfo =  
			getAspectJPrecedenceInformationFor(anAdvisor);
		if (precedenceInfo != null) {
			return precedenceInfo.isAfterAdvice();
		}
		else {
			// unpleasant instanceof test... 
			Advice advice = anAdvisor.getAdvice();
			if ((advice instanceof AfterReturningAdvice) ||
			    (advice instanceof ThrowsAdvice) ||
			    (advice instanceof AfterReturningAdviceInterceptor) ||
			    (advice instanceof AspectJAfterAdvice) ||
			    (advice instanceof AspectJAfterReturningAdvice) ||
			    (advice instanceof AspectJAfterThrowingAdvice) ||
			    (advice instanceof ThrowsAdviceInterceptor)) {
				return true;
			}
			else {
				return false;
			}
		}
	}
	
	public static boolean isBeforeAdvice(Advisor anAdvisor) {
		AspectJPrecedenceInformation precedenceInfo =  
			getAspectJPrecedenceInformationFor(anAdvisor);
		if (precedenceInfo != null) {
			return precedenceInfo.isBeforeAdvice();
		}
		else {
			return (anAdvisor.getAdvice() instanceof BeforeAdvice);
		}
	}
	
	/**
	 * Returns the AspectJPrecedenceInformation provided by this advisor or its advice.
	 * If neither the advisor nor the advice have precedence information, will return null.
	 */
	public static AspectJPrecedenceInformation getAspectJPrecedenceInformationFor(Advisor anAdvisor) {
		AspectJPrecedenceInformation ret = null;
		if (anAdvisor instanceof AspectJPrecedenceInformation) {
			ret = (AspectJPrecedenceInformation) anAdvisor;
		}
		else if (anAdvisor.getAdvice() instanceof AspectJPrecedenceInformation) {
			ret = (AspectJPrecedenceInformation) anAdvisor.getAdvice();
		}
		return ret;
	}

}