spring EmbeddedDatabaseBeanDefinitionParser 源码

  • 2022-08-08
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spring EmbeddedDatabaseBeanDefinitionParser 代码

文件路径:/spring-jdbc/src/main/java/org/springframework/jdbc/config/EmbeddedDatabaseBeanDefinitionParser.java

/*
 * Copyright 2002-2017 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.jdbc.config;

import org.w3c.dom.Element;

import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.beans.factory.support.AbstractBeanDefinition;
import org.springframework.beans.factory.support.BeanDefinitionBuilder;
import org.springframework.beans.factory.xml.AbstractBeanDefinitionParser;
import org.springframework.beans.factory.xml.ParserContext;
import org.springframework.jdbc.datasource.embedded.EmbeddedDatabaseFactoryBean;
import org.springframework.jdbc.datasource.init.ResourceDatabasePopulator;
import org.springframework.util.StringUtils;

/**
 * {@link org.springframework.beans.factory.xml.BeanDefinitionParser} that
 * parses an {@code embedded-database} element and creates a {@link BeanDefinition}
 * for an {@link EmbeddedDatabaseFactoryBean}.
 *
 * <p>Picks up nested {@code script} elements and configures a
 * {@link ResourceDatabasePopulator} for each of them.
 *
 * @author Oliver Gierke
 * @author Juergen Hoeller
 * @author Sam Brannen
 * @since 3.0
 * @see DatabasePopulatorConfigUtils
 */
class EmbeddedDatabaseBeanDefinitionParser extends AbstractBeanDefinitionParser {

	/**
	 * Constant for the "database-name" attribute.
	 */
	static final String DB_NAME_ATTRIBUTE = "database-name";

	/**
	 * Constant for the "generate-name" attribute.
	 */
	static final String GENERATE_NAME_ATTRIBUTE = "generate-name";


	@Override
	protected AbstractBeanDefinition parseInternal(Element element, ParserContext parserContext) {
		BeanDefinitionBuilder builder = BeanDefinitionBuilder.rootBeanDefinition(EmbeddedDatabaseFactoryBean.class);
		setGenerateUniqueDatabaseNameFlag(element, builder);
		setDatabaseName(element, builder);
		setDatabaseType(element, builder);
		DatabasePopulatorConfigUtils.setDatabasePopulator(element, builder);
		builder.getRawBeanDefinition().setSource(parserContext.extractSource(element));
		return builder.getBeanDefinition();
	}

	@Override
	protected boolean shouldGenerateIdAsFallback() {
		return true;
	}

	private void setGenerateUniqueDatabaseNameFlag(Element element, BeanDefinitionBuilder builder) {
		String generateName = element.getAttribute(GENERATE_NAME_ATTRIBUTE);
		if (StringUtils.hasText(generateName)) {
			builder.addPropertyValue("generateUniqueDatabaseName", generateName);
		}
	}

	private void setDatabaseName(Element element, BeanDefinitionBuilder builder) {
		// 1) Check for an explicit database name
		String name = element.getAttribute(DB_NAME_ATTRIBUTE);

		// 2) Fall back to an implicit database name based on the ID
		if (!StringUtils.hasText(name)) {
			name = element.getAttribute(ID_ATTRIBUTE);
		}

		if (StringUtils.hasText(name)) {
			builder.addPropertyValue("databaseName", name);
		}
		// else, let EmbeddedDatabaseFactory use the default "testdb" name
	}

	private void setDatabaseType(Element element, BeanDefinitionBuilder builder) {
		String type = element.getAttribute("type");
		if (StringUtils.hasText(type)) {
			builder.addPropertyValue("databaseType", type);
		}
	}

}

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