261 lines
11 KiB
Java
261 lines
11 KiB
Java
package de.mas.HIDTest;
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import java.io.File;
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import java.io.IOException;
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import java.security.CodeSource;
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import java.util.Properties;
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import javax.swing.JOptionPane;
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/**
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* Created by Reddit user king_of_the_universe / StackOverflow user Dreamspace President / dreamspace-president.com
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* <p>
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* v[(2), 2015-11-13 13:00 UTC]
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* <p>
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* One static method call will start a new instance of *THIS* application in the console and will EXIT the current instance. SO FAR ONLY WORKS ON WINDOWS! Users
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* of other systems need to assist here. The methods are all in place.
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*/
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final public class AutoRunFromConsole {
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final private static String FAILMESSAGE_TITLE = "Please run in console.";
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final private static String FAILMESSAGE_BODY = "This application must be run in the console (or \"command box\").\n\nIn there, you have to type:\n\njava -jar nameofprogram.jar";
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static void showFailMessageAndExit() {
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JOptionPane.showMessageDialog(null, FAILMESSAGE_BODY, FAILMESSAGE_TITLE, JOptionPane.INFORMATION_MESSAGE);
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System.exit(0);
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}
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private enum OSType {
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UNDETERMINED, WINDOWS, LINUX, MACOS
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}
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private static OSType getOsType() {
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// final String osName = System.getProperty("os.name");
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// final String osVersion = System.getProperty("os.version");
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// final String osArchitecture = System.getProperty("os.arch");
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// System.out.println("\n\nOSNAME: " + osName);
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// System.out.println("\n\nOSVERSION: " + osVersion);
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// System.out.println("\n\nOSARCHITECTURE: " + osArchitecture);
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final String osName = System.getProperty("os.name", "").toLowerCase();
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if (osName.startsWith("windows")) {
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return OSType.WINDOWS;
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} else if (osName.startsWith("linux")) {
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return OSType.LINUX;
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} else if (osName.startsWith("mac os") || osName.startsWith("macos") || osName.startsWith("darwin")) {
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return OSType.MACOS;
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}
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return OSType.UNDETERMINED;
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}
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/**
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* Checks if the program is currently running in console, and if not, starts the program from console and EXITS this instance of the program. Should be (one
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* of) the first calls in your program.
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* <p>
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* This is the less safe variant of the method: To check if you're currently in the IDE, it just tries to find the executable name and if it exists in the
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* current path. This should word perfectly at all times in IntelliJ - I don't know what values getExecutableName() returns inside Eclipse, but I suspect it
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* will work just as well.
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* <p>
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* It's also less safe because you can't give a fallback executable name, but I believe it should do the trick in all situations.
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* <p>
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* If this is used on a system other than Windows, a message box is shown telling the user to start the program from the console. BECAUSE I DON'T KNOW HOW
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* TO OPEN A CONSOLE ON OTHER SYSTEMS. SEE startExecutableInConsole();
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*/
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public static void runYourselfInConsole(final boolean stayOpenAfterEnd) {
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runYourselfInConsole(false, stayOpenAfterEnd, null, null);
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}
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/**
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* Checks if the program is currently running in console, and if not, starts the program from console and EXITS this instance of the program. Should be (one
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* of) the first calls in your program.
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* <p>
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* This is the safer variant of the method: The first command line argument GIVEN BY THE IDE'S RUN CONFIGURATION should be "ide" (Case is ignored.), which
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* this method will use to determine if it's running from the IDE.
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* <p>
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* It is also safer because you can give a fallback executable name in case getExecutableName() could not determine it.
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* <p>
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* Ultimately, it is safer because if the executable could not be determined, it shows a message box telling the user to start the program from the console.
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* <p>
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* You will probably never make use of this variant. It's meant to be a solution if all else seems to fail (e.g. customer calls and you need a quick fix).
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* <p>
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* If this is used on a system other than Windows, a message box is shown telling the user to start the program from the console. BECAUSE I DON'T KNOW HOW
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* TO OPEN A CONSOLE ON OTHER SYSTEMS. SEE startExecutableInConsole();
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*
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* @param psvmArguments
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* The arguments given to the main method.
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* @param fallbackExecutableName
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* Can be null. In case getExecutableName() can't determine the proper name, the fallback is used.
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*/
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public static void runYourselfInConsole(final String[] psvmArguments, final String fallbackExecutableName, final boolean stayOpenAfterEnd) {
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runYourselfInConsole(true, stayOpenAfterEnd, psvmArguments, fallbackExecutableName);
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}
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/**
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* see the other two methods
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*/
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private static void runYourselfInConsole(final boolean useSaferApproach, final boolean stayOpenAfterEnd, final String[] psvmArguments,
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final String fallbackExecutableName) {
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String executableName = getExecutableName(fallbackExecutableName);
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if (useSaferApproach) {
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if (isRunFromIDE(psvmArguments)) {
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return;
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}
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} else {
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if (executableName == null) {
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// Running from IDE.
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return;
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}
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}
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if (isRunningInConsole()) {
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return;
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}
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if (executableName == null) {
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showFailMessageAndExit();
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}
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startExecutableInConsole(executableName, stayOpenAfterEnd);
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System.exit(0);
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}
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/**
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* Opens a console window and starts the Java executable there.
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* <p>
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* If this is used on a system other than Windows, a message box is shown telling the user to start the program from the console. BECAUSE I DON'T KNOW HOW
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* TO OPEN A CONSOLE ON OTHER SYSTEMS.
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*
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* @param executableName
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* the full file name of the executable (without path)
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* @param stayOpenAfterEnd
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* If true (and if someone can figure out the necessary parameters for other systems than Windows), the console will not close once the
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* executable has terminated. This is useful e.g. if you want to give some kind of bye bye message because you actually assumed that people start
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* the program from console manually.
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*/
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private static void startExecutableInConsole(final String executableName, final boolean stayOpenAfterEnd) {
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String launchString = null;
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switch (getOsType()) {
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case UNDETERMINED:
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break;
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case WINDOWS:
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if (stayOpenAfterEnd) {
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launchString = "cmd /c start cmd /k java -jar \"" + executableName + "\""; // No, using /k directly here DOES NOT do the trick.
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} else {
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launchString = "cmd /c start java -jar \"" + executableName + "\"";
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}
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break;
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case LINUX:
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break;
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case MACOS:
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// launchString="/usr/bin/open -a Terminal /path/to/the/executable";
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break;
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}
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if (launchString == null) {
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showFailMessageAndExit();
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}
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try {
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Runtime.getRuntime().exec(launchString);
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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/**
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* @param args
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* the args as given to PSVM
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* @return whether the first command line argument was "ide" (ignoring case). Don't forget to change your IDE's run configuration accordingly.
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*/
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private static boolean isRunFromIDE(final String[] args) {
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return args != null && args.length > 0 && args[0].equalsIgnoreCase("ide");
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}
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/**
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* @return if System.console() is available. DOES NOT WORK properly from IDE, will return false then even though it should be true. Use isRunFromIDE or
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* other means additionally.
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*/
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private static boolean isRunningInConsole() {
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return System.console() != null;
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}
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/**
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* @param fallbackExecutableName
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* Can be null. In the very unlikely case this method can't determine the executable, the fallback will also be checked. But if the fallback also
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* doesn't exist AS A FILE in the CURRENT path, null will be returned regardless, even if you're sure that your fallback should be correct.
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* @return the name of the running jar file, OR NULL if it could not be determined (which should be a certainty while in IDE, hence can be abused for
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* determining that).
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*/
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public static String getExecutableName(final String fallbackExecutableName) {
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// APPROACH 1 - THE ONE EVERYBODY ON STACKOVERFLOW IS REPEATING
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String executableNameFromClass = null;
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final CodeSource codeSource = AutoRunFromConsole.class.getProtectionDomain().getCodeSource();
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if (codeSource == null) {
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System.err.println("UNEXPECTED: Main.class.getProtectionDomain().getCodeSource() returned null");
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} else {
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final String path = codeSource.getLocation().getPath();
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if (path == null || path.isEmpty()) {
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System.err.println("UNEXPECTED: codeSource.getLocation().getPath() returned null or empty");
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} else {
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executableNameFromClass = new File(path).getName();
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}
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}
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// APPROACH 2 - QUERY SYSTEM PROPERTIES
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final Properties properties = System.getProperties();
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final String executableNameFromJavaClassPathProperty = properties.getProperty("java.class.path");
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final String executableNameFromSunJavaCommandProperty = properties.getProperty("sun.java.command");
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// System.out.println("\n\nexecutableNameFromClass:\n" + executableNameFromClass);
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// System.out.println("\n\nexecutableNameFromJavaClassPathProperty:\n" + executableNameFromJavaClassPathProperty);
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// System.out.println("\n\nexecutableNameFromSunJavaCommandProperty:\n" + executableNameFromSunJavaCommandProperty);
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// System.out.println("\n\nfallbackExecutableName:\n" + fallbackExecutableName);
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if (isThisProbablyTheExecutable(executableNameFromClass)) {
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return executableNameFromClass;
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}
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if (isThisProbablyTheExecutable(executableNameFromJavaClassPathProperty)) {
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return executableNameFromJavaClassPathProperty;
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}
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if (isThisProbablyTheExecutable(executableNameFromSunJavaCommandProperty)) {
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return executableNameFromSunJavaCommandProperty;
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}
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if (isThisProbablyTheExecutable(fallbackExecutableName)) {
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return fallbackExecutableName;
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}
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return null;
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}
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/**
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* @param candidateName
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* suspected name of the running java executable
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* @return if name is not null, ends with ".jar" (Case is ignored.), and points to a FILE existing in the CURRENT directory.
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*/
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private static boolean isThisProbablyTheExecutable(final String candidateName) {
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if (candidateName == null || !candidateName.toLowerCase().endsWith(".jar")) {
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return false;
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}
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final File file = new File(candidateName);
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return file.exists() && file.isFile();
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}
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} |