/*
 * Copyright (c) 2011-2017 Contributors to the Eclipse Foundation
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
 * which is available at https://www.apache.org/licenses/LICENSE-2.0.
 *
 * SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
 */

package io.vertx.core.impl.launcher;

import java.io.File;

Utilities method to analyse original command line.
Author:Clement Escoffier
/** * Utilities method to analyse original command line. * * @author Clement Escoffier <clement@apache.org> */
public class CommandLineUtils {
Returns:the fat-jar file used to execute the application if the fat-jar approach is used.
/** * @return the fat-jar file used to execute the application if the fat-jar approach is used. */
public static String getJar() { // Check whether or not the "sun.java.command" system property is defined, // if it is, check whether the first segment of the command ends with ".jar". String segment = getFirstSegmentOfCommand(); if (segment != null && segment.endsWith(".jar")) { return segment; } else { // Second attend is to check the classpath. If the classpath contains only one element, // it's the fat jar String classpath = System.getProperty("java.class.path"); if (!classpath.isEmpty() && !classpath.contains(File.pathSeparator) && classpath.endsWith(".jar")) { return classpath; } } return null; }
Returns:try to get the command line having launched the application using the sun.java.command system properties. null if not set.
/** * @return try to get the command line having launched the application using the {@code sun.java.command} * system properties. {@code null} if not set. */
public static String getCommand() { return System.getProperty("sun.java.command"); }
Returns:the first segment of the command line.
/** * @return the first segment of the command line. */
public static String getFirstSegmentOfCommand() { String cmd = getCommand(); if (cmd != null) { String[] segments = cmd.split(" "); if (segments.length >= 1) { return segments[0]; } } return null; } }