/*
 * 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.transaction.annotation;

import org.springframework.context.annotation.AdviceMode;
import org.springframework.context.annotation.AdviceModeImportSelector;
import org.springframework.context.annotation.AutoProxyRegistrar;
import org.springframework.transaction.config.TransactionManagementConfigUtils;

/**
 我们发现TransactionManagementConfigurationSelector 实现了AdviceModeImportSelector的接口,
 由于在实现了ImportSelector接口的时候,在加载bean定义的时候会回调我们的selectImports方法
 * @author Chris Beams
 * @since 3.1
 * @see EnableTransactionManagement
 * @see ProxyTransactionManagementConfiguration
 * @see TransactionManagementConfigUtils#TRANSACTION_ASPECT_CONFIGURATION_CLASS_NAME
 */
public class TransactionManagementConfigurationSelector extends AdviceModeImportSelector<EnableTransactionManagement> {

	/**
	 * 在springioc容器中加载bean定义的时候会回调我们的selectImports方法
	 * 方法的返回值是我们需要导入类的全类名路径.然后这个类就会被加载到容器中
	 * Returns {@link ProxyTransactionManagementConfiguration} or
	 * {@code AspectJTransactionManagementConfiguration} for {@code PROXY}
	 * and {@code ASPECTJ} values of {@link EnableTransactionManagement#mode()},
	 * respectively.
	 */
	@Override
	protected String[] selectImports(AdviceMode adviceMode) {
		switch (adviceMode) {
			/**
			 * 为我们的容器中导入了二个组件 一个是AutoProxyRegistrar
			 * 一个是ProxyTransactionManagementConfiguration
			 */
			case PROXY:
				return new String[] {AutoProxyRegistrar.class.getName(),
						ProxyTransactionManagementConfiguration.class.getName()};
			case ASPECTJ:
				return new String[] {
						TransactionManagementConfigUtils.TRANSACTION_ASPECT_CONFIGURATION_CLASS_NAME};
			default:
				return null;
		}
	}

}
