spring DefaultPropertiesPropertySource 源码

springboot DefaultPropertiesPropertySource 代码

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

/*
 * Copyright 2012-2022 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;

import java.util.HashMap;
import java.util.Map;
import java.util.function.Consumer;

import org.springframework.core.env.ConfigurableEnvironment;
import org.springframework.core.env.Environment;
import org.springframework.core.env.MapPropertySource;
import org.springframework.core.env.MutablePropertySources;
import org.springframework.core.env.PropertySource;
import org.springframework.util.CollectionUtils;

/**
 * {@link MapPropertySource} containing default properties contributed directly to a
 * {@code SpringApplication}. By convention, the {@link DefaultPropertiesPropertySource}
 * is always the last property source in the {@link Environment}.
 *
 * @author Phillip Webb
 * @since 2.4.0
 */
public class DefaultPropertiesPropertySource extends MapPropertySource {

	/**
	 * The name of the 'default properties' property source.
	 */
	public static final String NAME = "defaultProperties";

	/**
	 * Create a new {@link DefaultPropertiesPropertySource} with the given {@code Map}
	 * source.
	 * @param source the source map
	 */
	public DefaultPropertiesPropertySource(Map<String, Object> source) {
		super(NAME, source);
	}

	/**
	 * Return {@code true} if the given source is named 'defaultProperties'.
	 * @param propertySource the property source to check
	 * @return {@code true} if the name matches
	 */
	public static boolean hasMatchingName(PropertySource<?> propertySource) {
		return (propertySource != null) && propertySource.getName().equals(NAME);
	}

	/**
	 * Create a new {@link DefaultPropertiesPropertySource} instance if the provided
	 * source is not empty.
	 * @param source the {@code Map} source
	 * @param action the action used to consume the
	 * {@link DefaultPropertiesPropertySource}
	 */
	public static void ifNotEmpty(Map<String, Object> source, Consumer<DefaultPropertiesPropertySource> action) {
		if (!CollectionUtils.isEmpty(source) && action != null) {
			action.accept(new DefaultPropertiesPropertySource(source));
		}
	}

	/**
	 * Add a new {@link DefaultPropertiesPropertySource} or merge with an existing one.
	 * @param source the {@code Map} source
	 * @param sources the existing sources
	 * @since 2.4.4
	 */
	public static void addOrMerge(Map<String, Object> source, MutablePropertySources sources) {
		if (!CollectionUtils.isEmpty(source)) {
			Map<String, Object> resultingSource = new HashMap<>();
			DefaultPropertiesPropertySource propertySource = new DefaultPropertiesPropertySource(resultingSource);
			if (sources.contains(NAME)) {
				mergeIfPossible(source, sources, resultingSource);
				sources.replace(NAME, propertySource);
			}
			else {
				resultingSource.putAll(source);
				sources.addLast(propertySource);
			}
		}
	}

	@SuppressWarnings("unchecked")
	private static void mergeIfPossible(Map<String, Object> source, MutablePropertySources sources,
			Map<String, Object> resultingSource) {
		PropertySource<?> existingSource = sources.get(NAME);
		if (existingSource != null) {
			Object underlyingSource = existingSource.getSource();
			if (underlyingSource instanceof Map) {
				resultingSource.putAll((Map<String, Object>) underlyingSource);
			}
			resultingSource.putAll(source);
		}
	}

	/**
	 * Move the 'defaultProperties' property source so that it's the last source in the
	 * given {@link ConfigurableEnvironment}.
	 * @param environment the environment to update
	 */
	public static void moveToEnd(ConfigurableEnvironment environment) {
		moveToEnd(environment.getPropertySources());
	}

	/**
	 * Move the 'defaultProperties' property source so that it's the last source in the
	 * given {@link MutablePropertySources}.
	 * @param propertySources the property sources to update
	 */
	public static void moveToEnd(MutablePropertySources propertySources) {
		PropertySource<?> propertySource = propertySources.remove(NAME);
		if (propertySource != null) {
			propertySources.addLast(propertySource);
		}
	}

}

相关信息

spring 源码目录

相关文章

spring AotProcessor 源码

spring ApplicationArguments 源码

spring ApplicationContextFactory 源码

spring ApplicationEnvironment 源码

spring ApplicationReactiveWebEnvironment 源码

spring ApplicationRunner 源码

spring ApplicationServletEnvironment 源码

spring Banner 源码

spring BeanDefinitionLoader 源码

spring BootstrapContext 源码