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/*
 * Copyright 2002-2018 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
 *
 *      https://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.
 */

package org.springframework.aop.config;

import org.w3c.dom.Element;

import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.beans.factory.parsing.BeanComponentDefinition;
import org.springframework.beans.factory.support.BeanDefinitionRegistry;
import org.springframework.beans.factory.xml.ParserContext;
import org.springframework.lang.Nullable;

/**
 * Utility class for handling registration of auto-proxy creators used internally
 * by the '{@code aop}' namespace tags.
 *
 * 

Only a single auto-proxy creator should be registered and multiple configuration * elements may wish to register different concrete implementations. As such this class * delegates to {@link AopConfigUtils} which provides a simple escalation protocol. * Callers may request a particular auto-proxy creator and know that creator, * or a more capable variant thereof, will be registered as a post-processor. * * @author Rob Harrop * @author Juergen Hoeller * @author Mark Fisher * @since 2.0 * @see AopConfigUtils */ public abstract class AopNamespaceUtils { /** * The {@code proxy-target-class} attribute as found on AOP-related XML tags. */ public static final String PROXY_TARGET_CLASS_ATTRIBUTE = "proxy-target-class"; /** * The {@code expose-proxy} attribute as found on AOP-related XML tags. */ private static final String EXPOSE_PROXY_ATTRIBUTE = "expose-proxy"; public static void registerAutoProxyCreatorIfNecessary( ParserContext parserContext, Element sourceElement) { BeanDefinition beanDefinition = AopConfigUtils.registerAutoProxyCreatorIfNecessary( parserContext.getRegistry(), parserContext.extractSource(sourceElement)); useClassProxyingIfNecessary(parserContext.getRegistry(), sourceElement); registerComponentIfNecessary(beanDefinition, parserContext); } public static void registerAspectJAutoProxyCreatorIfNecessary( ParserContext parserContext, Element sourceElement) { BeanDefinition beanDefinition = AopConfigUtils.registerAspectJAutoProxyCreatorIfNecessary( parserContext.getRegistry(), parserContext.extractSource(sourceElement)); useClassProxyingIfNecessary(parserContext.getRegistry(), sourceElement); registerComponentIfNecessary(beanDefinition, parserContext); } public static void registerAspectJAnnotationAutoProxyCreatorIfNecessary( ParserContext parserContext, Element sourceElement) { BeanDefinition beanDefinition = AopConfigUtils.registerAspectJAnnotationAutoProxyCreatorIfNecessary( parserContext.getRegistry(), parserContext.extractSource(sourceElement)); useClassProxyingIfNecessary(parserContext.getRegistry(), sourceElement); registerComponentIfNecessary(beanDefinition, parserContext); } private static void useClassProxyingIfNecessary(BeanDefinitionRegistry registry, @Nullable Element sourceElement) { if (sourceElement != null) { boolean proxyTargetClass = Boolean.parseBoolean(sourceElement.getAttribute(PROXY_TARGET_CLASS_ATTRIBUTE)); if (proxyTargetClass) { AopConfigUtils.forceAutoProxyCreatorToUseClassProxying(registry); } boolean exposeProxy = Boolean.parseBoolean(sourceElement.getAttribute(EXPOSE_PROXY_ATTRIBUTE)); if (exposeProxy) { AopConfigUtils.forceAutoProxyCreatorToExposeProxy(registry); } } } private static void registerComponentIfNecessary(@Nullable BeanDefinition beanDefinition, ParserContext parserContext) { if (beanDefinition != null) { parserContext.registerComponent( new BeanComponentDefinition(beanDefinition, AopConfigUtils.AUTO_PROXY_CREATOR_BEAN_NAME)); } } }





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