spring Context 源码

springboot Context 代码

文件路径：/spring-boot-project/spring-boot-tools/spring-boot-jarmode-layertools/src/main/java/org/springframework/boot/jarmode/layertools/Context.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.jarmode.layertools;

import java.io.File;
import java.io.IOException;
import java.net.JarURLConnection;
import java.net.URISyntaxException;
import java.net.URL;
import java.net.URLConnection;
import java.nio.file.Paths;
import java.security.CodeSource;
import java.security.ProtectionDomain;
import java.util.jar.JarFile;

import org.springframework.util.Assert;

/**
 * Context for use by commands.
 *
 * @author Phillip Webb
 */
class Context {

	private final File archiveFile;

	private final File workingDir;

	private final String relativeDir;

	/**
	 * Create a new {@link Context} instance.
	 */
	Context() {
		this(getSourceArchiveFile(), Paths.get(".").toAbsolutePath().normalize().toFile());
	}

	/**
	 * Create a new {@link Context} instance with the specified value.
	 * @param archiveFile the source archive file
	 * @param workingDir the working directory
	 */
	Context(File archiveFile, File workingDir) {
		Assert.state(isExistingFile(archiveFile) && isJarOrWar(archiveFile), "Unable to find source archive");
		this.archiveFile = archiveFile;
		this.workingDir = workingDir;
		this.relativeDir = deduceRelativeDir(archiveFile.getParentFile(), this.workingDir);
	}

	private boolean isExistingFile(File archiveFile) {
		return archiveFile != null && archiveFile.isFile() && archiveFile.exists();
	}

	private boolean isJarOrWar(File jarFile) {
		String name = jarFile.getName().toLowerCase();
		return name.endsWith(".jar") || name.endsWith(".war");
	}

	private static File getSourceArchiveFile() {
		try {
			ProtectionDomain domain = Context.class.getProtectionDomain();
			CodeSource codeSource = (domain != null) ? domain.getCodeSource() : null;
			URL location = (codeSource != null) ? codeSource.getLocation() : null;
			File source = (location != null) ? findSource(location) : null;
			if (source != null && source.exists()) {
				return source.getAbsoluteFile();
			}
			return null;
		}
		catch (Exception ex) {
			return null;
		}
	}

	private static File findSource(URL location) throws IOException, URISyntaxException {
		URLConnection connection = location.openConnection();
		if (connection instanceof JarURLConnection jarURLConnection) {
			return getRootJarFile(jarURLConnection.getJarFile());
		}
		return new File(location.toURI());
	}

	private static File getRootJarFile(JarFile jarFile) {
		String name = jarFile.getName();
		int separator = name.indexOf("!/");
		if (separator > 0) {
			name = name.substring(0, separator);
		}
		return new File(name);
	}

	private String deduceRelativeDir(File sourceDirectory, File workingDir) {
		String sourcePath = sourceDirectory.getAbsolutePath();
		String workingPath = workingDir.getAbsolutePath();
		if (sourcePath.equals(workingPath) || !sourcePath.startsWith(workingPath)) {
			return null;
		}
		String relativePath = sourcePath.substring(workingPath.length() + 1);
		return !relativePath.isEmpty() ? relativePath : null;
	}

	/**
	 * Return the source archive file that is running in tools mode.
	 * @return the archive file
	 */
	File getArchiveFile() {
		return this.archiveFile;
	}

	/**
	 * Return the current working directory.
	 * @return the working dir
	 */
	File getWorkingDir() {
		return this.workingDir;
	}

	/**
	 * Return the directory relative to {@link #getWorkingDir()} that contains the archive
	 * or {@code null} if none relative directory can be deduced.
	 * @return the relative dir ending in {@code /} or {@code null}
	 */
	String getRelativeArchiveDir() {
		return this.relativeDir;
	}

}

相关信息

spring 源码目录

相关文章

spring Command 源码

spring ExtractCommand 源码

spring HelpCommand 源码

spring IndexedLayers 源码

spring LayerToolsJarMode 源码

spring Layers 源码

spring ListCommand 源码

spring MissingValueException 源码

spring UnknownOptionException 源码

spring package-info 源码