spring SystemEnvironmentPropertySourceEnvironmentPostProcessor 源码

springboot SystemEnvironmentPropertySourceEnvironmentPostProcessor 代码

文件路径：/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/env/SystemEnvironmentPropertySourceEnvironmentPostProcessor.java

/*
 * Copyright 2012-2021 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.boot.env;

import java.util.Map;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.origin.Origin;
import org.springframework.boot.origin.OriginLookup;
import org.springframework.boot.origin.SystemEnvironmentOrigin;
import org.springframework.core.Ordered;
import org.springframework.core.env.ConfigurableEnvironment;
import org.springframework.core.env.PropertySource;
import org.springframework.core.env.StandardEnvironment;
import org.springframework.core.env.SystemEnvironmentPropertySource;
import org.springframework.util.StringUtils;

/**
 * An {@link EnvironmentPostProcessor} that replaces the systemEnvironment
 * {@link SystemEnvironmentPropertySource} with an
 * {@link OriginAwareSystemEnvironmentPropertySource} that can track the
 * {@link SystemEnvironmentOrigin} for every system environment property.
 *
 * @author Madhura Bhave
 * @since 2.0.0
 */
public class SystemEnvironmentPropertySourceEnvironmentPostProcessor implements EnvironmentPostProcessor, Ordered {

	/**
	 * The default order for the processor.
	 */
	public static final int DEFAULT_ORDER = SpringApplicationJsonEnvironmentPostProcessor.DEFAULT_ORDER - 1;

	private int order = DEFAULT_ORDER;

	@Override
	public void postProcessEnvironment(ConfigurableEnvironment environment, SpringApplication application) {
		String sourceName = StandardEnvironment.SYSTEM_ENVIRONMENT_PROPERTY_SOURCE_NAME;
		PropertySource<?> propertySource = environment.getPropertySources().get(sourceName);
		if (propertySource != null) {
			replacePropertySource(environment, sourceName, propertySource, application.getEnvironmentPrefix());
		}
	}

	@SuppressWarnings("unchecked")
	private void replacePropertySource(ConfigurableEnvironment environment, String sourceName,
			PropertySource<?> propertySource, String environmentPrefix) {
		Map<String, Object> originalSource = (Map<String, Object>) propertySource.getSource();
		SystemEnvironmentPropertySource source = new OriginAwareSystemEnvironmentPropertySource(sourceName,
				originalSource, environmentPrefix);
		environment.getPropertySources().replace(sourceName, source);
	}

	@Override
	public int getOrder() {
		return this.order;
	}

	public void setOrder(int order) {
		this.order = order;
	}

	/**
	 * {@link SystemEnvironmentPropertySource} that also tracks {@link Origin}.
	 */
	protected static class OriginAwareSystemEnvironmentPropertySource extends SystemEnvironmentPropertySource
			implements OriginLookup<String> {

		private final String prefix;

		OriginAwareSystemEnvironmentPropertySource(String name, Map<String, Object> source, String environmentPrefix) {
			super(name, source);
			this.prefix = determinePrefix(environmentPrefix);
		}

		private String determinePrefix(String environmentPrefix) {
			if (!StringUtils.hasText(environmentPrefix)) {
				return null;
			}
			if (environmentPrefix.endsWith(".") || environmentPrefix.endsWith("_") || environmentPrefix.endsWith("-")) {
				return environmentPrefix.substring(0, environmentPrefix.length() - 1);
			}
			return environmentPrefix;
		}

		@Override
		public boolean containsProperty(String name) {
			return super.containsProperty(name);
		}

		@Override
		public Object getProperty(String name) {
			return super.getProperty(name);
		}

		@Override
		public Origin getOrigin(String key) {
			String property = resolvePropertyName(key);
			if (super.containsProperty(property)) {
				return new SystemEnvironmentOrigin(property);
			}
			return null;
		}

		@Override
		public String getPrefix() {
			return this.prefix;
		}

	}

}

相关信息

spring 源码目录

相关文章

spring ConfigTreePropertySource 源码

spring EnvironmentPostProcessor 源码

spring EnvironmentPostProcessorApplicationListener 源码

spring EnvironmentPostProcessorsFactory 源码

spring OriginTrackedMapPropertySource 源码

spring OriginTrackedPropertiesLoader 源码

spring OriginTrackedYamlLoader 源码

spring PropertiesPropertySourceLoader 源码

spring PropertySourceLoader 源码

spring PropertySourceRuntimeHints 源码