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Spring AOP

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/*
 * Copyright 2002-2012 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.RootBeanDefinition;
import org.springframework.beans.factory.xml.BeanDefinitionParser;
import org.springframework.beans.factory.xml.ParserContext;

/**
 * {@link BeanDefinitionParser} responsible for parsing the
 * {@code } tag.
 *
 * NOTE: This is essentially a duplicate of Spring 2.5's
 * {@link org.springframework.context.config.SpringConfiguredBeanDefinitionParser}
 * for the {@code } tag, mirrored here for compatibility with
 * Spring 2.0's {@code } tag (avoiding a direct dependency on the
 * context package).
 *
 * @author Rob Harrop
 * @author Juergen Hoeller
 * @since 2.0
 */
class SpringConfiguredBeanDefinitionParser implements BeanDefinitionParser {

	/**
	 * The bean name of the internally managed bean configurer aspect.
	 */
	public static final String BEAN_CONFIGURER_ASPECT_BEAN_NAME =
			"org.springframework.context.config.internalBeanConfigurerAspect";

	private static final String BEAN_CONFIGURER_ASPECT_CLASS_NAME =
			"org.springframework.beans.factory.aspectj.AnnotationBeanConfigurerAspect";


	@Override
	public BeanDefinition parse(Element element, ParserContext parserContext) {
		if (!parserContext.getRegistry().containsBeanDefinition(BEAN_CONFIGURER_ASPECT_BEAN_NAME)) {
			RootBeanDefinition def = new RootBeanDefinition();
			def.setBeanClassName(BEAN_CONFIGURER_ASPECT_CLASS_NAME);
			def.setFactoryMethodName("aspectOf");
			def.setRole(BeanDefinition.ROLE_INFRASTRUCTURE);
			def.setSource(parserContext.extractSource(element));
			parserContext.registerBeanComponent(new BeanComponentDefinition(def, BEAN_CONFIGURER_ASPECT_BEAN_NAME));
		}
		return null;
	}

}