Updates the updater to use the new updater .jar

src/main/java/net/knarcraft/minecraftserverlauncher/utility/Updater.java

@@ -4,15 +4,14 @@ import com.google.gson.JsonArray;
 import com.google.gson.JsonElement;
 import com.google.gson.JsonObject;
 import com.google.gson.JsonParser;
+import net.knarcraft.minecraftserverlauncher.Main;
 import net.knarcraft.minecraftserverlauncher.userinterface.GUI;
 
 import javax.swing.*;
-import java.io.File;
+import java.io.*;
-import java.io.FileNotFoundException;
+import java.nio.file.Paths;
-import java.io.IOException;
 import java.util.Scanner;
 
-import static net.knarcraft.minecraftserverlauncher.Main.getApplicationWorkDirectory;
 import static net.knarcraft.minecraftserverlauncher.utility.CommonFunctions.downloadFile;
 import static net.knarcraft.minecraftserverlauncher.utility.CommonFunctions.getResourceAsScanner;
 import static net.knarcraft.minecraftserverlauncher.utility.CommonFunctions.readFile;
@@ -22,15 +21,19 @@ import static net.knarcraft.minecraftserverlauncher.utility.CommonFunctions.read
  */
 public final class Updater {
 
+    private static final String updaterFile = Main.getApplicationWorkDirectory() + File.separator + "Updater.jar";
+    private static final String updaterURL = "https://jenkins.knarcraft.net/job/KnarCraft/job/Jar-Updater/job/master/" +
+            "lastSuccessfulBuild/artifact/target/jar-updater-1.0-SNAPSHOT.jar";
+    private static final String targetFile = "minecraft-server-launcher.jar";
+
     /**
      * Checks if a newer version is available
      *
      * @param updateURL     <p>The URL used for checking for updates</p>
      * @param updateChannel <p>The release channel to use</p>
-     * @param gui           <p>The GUI to use for output</p>
      * @throws IOException <p>If the update data cannot be read</p>
      */
-    public static void checkForUpdate(String updateURL, String updateChannel, GUI gui) throws IOException {
+    public static void checkForUpdate(String updateURL, String updateChannel) throws IOException {
         Scanner file = getResourceAsScanner("currentversion.csv");
         if (!file.hasNextLine()) {
             throw new FileNotFoundException("File currentversion.csv is invalid");
@@ -47,7 +50,6 @@ public final class Updater {
         String latest = jsonObject.getAsJsonObject("latest").get(updateChannel).getAsString();
 
         if (!oldType.equals(updateChannel) || !oldVer.equals(latest)) {
-            String dir = getApplicationWorkDirectory() + File.separator;
             JsonArray versionList = jsonObject.getAsJsonArray("versions");
             String url = "";
             for (JsonElement elem : versionList) {
@@ -56,49 +58,35 @@ public final class Updater {
                 String type = obj.get("type").getAsString();
                 if (ver.equals(latest) && type.equals(updateChannel)) {
                     url = obj.get("url").getAsString();
+                    break;
                 }
             }
-            if (downloadFile(url, new File(dir + "update.jar").toPath())) {
+            if (!new File(updaterFile).exists()) {
-                doUpdate(dir, gui);
+                downloadFile(updaterURL, Paths.get(updaterFile));
-            } else {
+            }
-                gui.showError("Update available",
+
-                        "An update is available, but could not be downloaded.");
+            int answer = JOptionPane.showConfirmDialog(null,
+                    "An update is available. Do you want to update?", "Update available",
+                    JOptionPane.YES_NO_OPTION
+            );
+            if (answer == JOptionPane.YES_NO_OPTION) {
+                runUpdater(url);
             }
         }
     }
 
     /**
-     * Asks the user whether to update and downloads the new update
+     * Updates the software
      *
-     * @param dir <p>The directory to save the updated file to</p>
+     * @param url <p>The URL of the new file to download</p>
-     * @param gui <p>The GUI to write output to</p>
+     * @throws IOException <p>If unable to run the updater</p>
      */
-    public static void doUpdate(String dir, GUI gui) {
+    private static void runUpdater(String url) throws IOException {
-        int answer = JOptionPane.showConfirmDialog(
+        ProcessBuilder builder;
-                null,
+        builder = new ProcessBuilder("java", "-jar", "Updater.jar", url, "yes", targetFile, "5", "nogui");
-                "An update is available. Do you want to update?",
+        builder.directory(new File(Main.getApplicationWorkDirectory()));
-                "Update available",
+        builder.redirectErrorStream(true);
-                JOptionPane.YES_NO_OPTION
+        builder.start();
-        );
+        System.exit(1);
-        if (answer == JOptionPane.YES_NO_OPTION) {
-            if (new File(dir + "Minecraft-Server-Launcher.jar").renameTo(new File(dir +
-                    "Old.jar"))) {
-                if (new File(dir + "update.jar").renameTo(new File(dir +
-                        "Minecraft-Server-Launcher.jar"))) {
-                    if (new File(dir + "Old.jar").delete()) {
-                        gui.showMessage("Update complete",
-                                "Update finished. Please run the software again.");
-                        System.exit(0);
-                    }
-                } else {
-                    if (!new File(dir + "Old.jar").renameTo(new File(dir +
-                            "Minecraft-Server-Launcher.jar"))) {
-                        System.out.println("Shit");
-                    }
-                }
-            }
-            gui.showError("Update failed",
-                    "Could not replace the main .jar with the downloaded .jar.");
-        }
     }
 }