spring PropertiesMergingResourceTransformer 源码

springboot PropertiesMergingResourceTransformer 代码

文件路径：/spring-boot-project/spring-boot-tools/spring-boot-maven-plugin/src/main/java/org/springframework/boot/maven/PropertiesMergingResourceTransformer.java

/*
 * Copyright 2012-2020 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.maven;

import java.io.IOException;
import java.io.InputStream;
import java.util.List;
import java.util.Properties;
import java.util.jar.JarEntry;
import java.util.jar.JarOutputStream;

import org.apache.maven.plugins.shade.relocation.Relocator;
import org.apache.maven.plugins.shade.resource.ReproducibleResourceTransformer;

/**
 * Extension for the <a href="https://maven.apache.org/plugins/maven-shade-plugin/">Maven
 * shade plugin</a> to allow properties files (e.g. {@literal META-INF/spring.factories})
 * to be merged without losing any information.
 *
 * @author Dave Syer
 * @author Andy Wilkinson
 * @since 1.0.0
 */
public class PropertiesMergingResourceTransformer implements ReproducibleResourceTransformer {

	// Set this in pom configuration with <resource>...</resource>
	private String resource;

	private final Properties data = new Properties();

	private long time;

	/**
	 * Return the data the properties being merged.
	 * @return the data
	 */
	public Properties getData() {
		return this.data;
	}

	@Override
	public boolean canTransformResource(String resource) {
		return this.resource != null && this.resource.equalsIgnoreCase(resource);
	}

	@Override
	@Deprecated
	public void processResource(String resource, InputStream inputStream, List<Relocator> relocators)
			throws IOException {
		processResource(resource, inputStream, relocators, 0);
	}

	@Override
	public void processResource(String resource, InputStream inputStream, List<Relocator> relocators, long time)
			throws IOException {
		Properties properties = new Properties();
		properties.load(inputStream);
		inputStream.close();
		properties.forEach((name, value) -> process((String) name, (String) value));
		if (time > this.time) {
			this.time = time;
		}
	}

	private void process(String name, String value) {
		String existing = this.data.getProperty(name);
		this.data.setProperty(name, (existing != null) ? existing + "," + value : value);
	}

	@Override
	public boolean hasTransformedResource() {
		return !this.data.isEmpty();
	}

	@Override
	public void modifyOutputStream(JarOutputStream os) throws IOException {
		JarEntry jarEntry = new JarEntry(this.resource);
		jarEntry.setTime(this.time);
		os.putNextEntry(jarEntry);
		this.data.store(os, "Merged by PropertiesMergingResourceTransformer");
		os.flush();
		this.data.clear();
	}

	public String getResource() {
		return this.resource;
	}

	public void setResource(String resource) {
		this.resource = resource;
	}

}

相关信息

spring 源码目录

相关文章

spring AbstractDependencyFilterMojo 源码

spring AbstractPackagerMojo 源码

spring AbstractRunMojo 源码

spring AotGenerateMojo 源码

spring ArtifactsLibraries 源码

spring BuildImageMojo 源码

spring BuildInfoMojo 源码

spring CacheInfo 源码

spring CommandLineBuilder 源码

spring CustomLayersProvider 源码