Makes some improvements

Saves the downloaded BuildTools version to the server version container
Adds a check to see whether the BuildTools file exists
Adds a helper function for reading local files

src/main/java/net/knarcraft/minecraftserverlauncher/profile/Controller.java

@@ -191,7 +191,7 @@ public class Controller {
         //Loads data regarding this controller
         String currentProfile = null;
         if (new File(mainFile).exists()) {
-            String controllerData = CommonFunctions.readBufferedReader(new BufferedReader(new InputStreamReader(new FileInputStream(mainFile))));
+            String controllerData = CommonFunctions.readFile(mainFile);
             currentProfile = this.fromString(controllerData);
         } else {
             this.serverLauncherGUI = new ServerLauncherGUI();
@@ -274,7 +274,7 @@ public class Controller {
         try {
             CommonFunctions.createAllFolders();
             PrintWriter mFile = new PrintWriter(mainFile);
-            mFile.println(this.toString());
+            mFile.println(this);
             mFile.close();
             PrintWriter pFile = new PrintWriter(profilesFile);
             for (Profile profile : profileList) {

src/main/java/net/knarcraft/minecraftserverlauncher/server/Server.java

@@ -532,9 +532,9 @@ public class Server {
 
     /**
      * Returns the first regex capture group found in a pattern
-     * @param pattern <p>The regex pattern to use.</p>
-     * @param text <p>The string to execute the pattern on.</p>
-     * @return <p>The first capture group if a match is found. An empty string otherwise.</p>
+     * @param pattern <p>The regex pattern to use</p>
+     * @param text <p>The string to execute the pattern on</p>
+     * @return <p>The first capture group if a match is found. An empty string otherwise</p>
      */
     private String getFirstRegexCaptureGroup(String pattern, String text) {
         Pattern compiledPattern = Pattern.compile(pattern);

src/main/java/net/knarcraft/minecraftserverlauncher/server/ServerVersionContainer.java

@@ -21,6 +21,7 @@ public class ServerVersionContainer {
     private Map<String, String> travertineVersions;
     private Map<String, String> spongeVanillaVersions;
     private Map<String, String> spongeForgeVersions;
+    private String downloadedBuildToolsVersion;
 
     /**
      * Initializes a new server version container
@@ -56,6 +57,7 @@ public class ServerVersionContainer {
         this.travertineVersions = new HashMap<>();
         this.spongeVanillaVersions = new HashMap<>();
         this.spongeForgeVersions = new HashMap<>();
+        this.downloadedBuildToolsVersion = null;
     }
 
     @Override
@@ -66,7 +68,8 @@ public class ServerVersionContainer {
                 "waterfallVersions;" + mapToString(waterfallVersions) + "\n" +
                 "travertineVersions;" + mapToString(travertineVersions) + "\n" +
                 "spongeVanillaVersions;" + mapToString(spongeVanillaVersions) + "\n" +
-                "spongeForgeVersions;" + mapToString(spongeForgeVersions);
+                "spongeForgeVersions;" + mapToString(spongeForgeVersions) + "\n" +
+                "downloadedBuildToolsVersion;" + downloadedBuildToolsVersion;
     }
 
     /**
@@ -105,7 +108,7 @@ public class ServerVersionContainer {
                 }
             }
             file = new PrintWriter(versionFile);
-            file.println(this.toString());
+            file.println(this);
             file.close();
         } catch (IOException e) {
             e.printStackTrace();
@@ -163,6 +166,9 @@ public class ServerVersionContainer {
             case "spongeForgeVersions":
                 parseVersionsToMap(spongeForgeVersions, variableValue);
                 break;
+            case "downloadedBuildToolsVersion":
+                downloadedBuildToolsVersion = variableValue;
+                break;
             default:
                 throw new IllegalArgumentException("Invalid key encountered in the server version file.");
         }
@@ -323,5 +329,25 @@ public class ServerVersionContainer {
         spongeForgeVersions.put(mapKey, newValue);
         saveState();
     }
+
+    /**
+     * Gets the version of the downloaded BuildTools file
+     *
+     * @return <p>The version of the downloaded BuildTools file</p>
+     */
+    public String getDownloadedBuildToolsVersion() {
+        return this.downloadedBuildToolsVersion;
+    }
+
+    /**
+     * Sets the version of the downloaded BuildTools file
+     *
+     * @param newValue <p>The new version</p></p>
+     */
+    public void setDownloadedBuildToolsVersion(String newValue) {
+        this.downloadedBuildToolsVersion = newValue;
+        saveState();
+    }
+
 }
 

src/main/java/net/knarcraft/minecraftserverlauncher/server/servertypes/BungeeCord.java

@@ -7,7 +7,7 @@ import java.io.IOException;
 import java.nio.file.Paths;
 
 import static net.knarcraft.minecraftserverlauncher.utility.CommonFunctions.downloadFile;
-import static net.knarcraft.minecraftserverlauncher.utility.CommonFunctions.readFile;
+import static net.knarcraft.minecraftserverlauncher.utility.CommonFunctions.readRemoteFile;
 import static net.knarcraft.minecraftserverlauncher.utility.CommonFunctions.stringBetween;
 
 /**
@@ -65,7 +65,7 @@ public class BungeeCord extends AbstractServerType {
     private boolean downloadLatestJar(File filePath) throws IOException {
         ServerVersionContainer versionContainer = ServerVersionContainer.getInstance();
 
-        String newestVersion = stringBetween(readFile(versionURL), srcStart, srcEnd);
+        String newestVersion = stringBetween(readRemoteFile(versionURL), srcStart, srcEnd);
         String oldVersion = versionContainer.getBungeeVersion();
         //The file is already the newest version
         if (filePath.isFile() && newestVersion.equals(oldVersion)) {

src/main/java/net/knarcraft/minecraftserverlauncher/server/servertypes/SpongeVanilla.java

@@ -53,7 +53,7 @@ public class SpongeVanilla extends AbstractServerType {
         String file = this.getName() + version + ".jar";
         File filePath = new File(folder + file);
 
-        String versionText = CommonFunctions.readFile(versionURL + version);
+        String versionText = CommonFunctions.readRemoteFile(versionURL + version);
         String newestVersion = CommonFunctions.stringBetween(versionText, srcStart, srcEnd);
 
         String jarURL = downloadURL + newestVersion + downloadURLPart + newestVersion + ".jar";

src/main/java/net/knarcraft/minecraftserverlauncher/server/servertypes/Vanilla.java

@@ -12,7 +12,7 @@ import java.io.IOException;
 import java.nio.file.Paths;
 
 import static net.knarcraft.minecraftserverlauncher.utility.CommonFunctions.downloadFile;
-import static net.knarcraft.minecraftserverlauncher.utility.CommonFunctions.readFile;
+import static net.knarcraft.minecraftserverlauncher.utility.CommonFunctions.readRemoteFile;
 
 /**
  * This class represents the regular vanilla Minecraft server type
@@ -90,7 +90,7 @@ public class Vanilla extends AbstractServerType {
      * @throws IOException <p>If the remote resource cannot be readFromServer</p>
      */
     private String[] getLatestFile(String releaseType) throws IOException {
-        String versionText = readFile(versionURL);
+        String versionText = readRemoteFile(versionURL);
         JsonObject jsonObject = new JsonParser().parse(versionText).getAsJsonObject();
         String latest = jsonObject.getAsJsonObject("latest").get(releaseType).getAsString();
         String versionURL = getServerFileVersionURL(latest);
@@ -106,7 +106,7 @@ public class Vanilla extends AbstractServerType {
      * @throws IOException <p>If the remote resource cannot be readFromServer</p>
      */
     private String getVanillaDownloadURL(String versionURL) throws IOException {
-        String versionText = readFile(versionURL);
+        String versionText = readRemoteFile(versionURL);
         JsonObject jsonObject = new JsonParser().parse(versionText).getAsJsonObject();
         return jsonObject.getAsJsonObject("downloads").getAsJsonObject("server").get("url").getAsString();
     }
@@ -119,7 +119,7 @@ public class Vanilla extends AbstractServerType {
      * @throws IOException <p>If the file cannot be downloaded</p>
      */
     private String getServerFileVersionURL(String targetVersion) throws IOException {
-        String versionText = readFile(versionURL);
+        String versionText = readRemoteFile(versionURL);
         JsonObject jsonObject = new JsonParser().parse(versionText).getAsJsonObject();
         JsonArray availableVersions = jsonObject.getAsJsonArray("versions");
         for (JsonElement availableVersion : availableVersions) {

src/main/java/net/knarcraft/minecraftserverlauncher/server/servertypes/Waterfall.java

@@ -9,7 +9,7 @@ import java.util.function.BiConsumer;
 import java.util.function.Function;
 
 import static net.knarcraft.minecraftserverlauncher.utility.CommonFunctions.downloadFile;
-import static net.knarcraft.minecraftserverlauncher.utility.CommonFunctions.readFile;
+import static net.knarcraft.minecraftserverlauncher.utility.CommonFunctions.readRemoteFile;
 import static net.knarcraft.minecraftserverlauncher.utility.CommonFunctions.stringBetween;
 
 /**
@@ -50,7 +50,7 @@ public class Waterfall extends AbstractServerType {
     public boolean downloadJar(String folder, String version) throws IOException {
         String file = this.getName() + version + ".jar";
         File filePath = new File(folder + file);
-        String newestVersion = stringBetween(readFile(versionURL + version), srcStart, srcEnd);
+        String newestVersion = stringBetween(readRemoteFile(versionURL + version), srcStart, srcEnd);
         String fullURL = downloadURL + version + "/" + newestVersion + "/download";
         String oldVersion = oldVersionFunction.apply(version);
         //The file is already the newest version

src/main/java/net/knarcraft/minecraftserverlauncher/userinterface/Console.java

@@ -77,7 +77,7 @@ public class Console extends KeyAdapter implements ActionListener, KeyListener {
 
     /**
      * Truncates the first 50 lines if the console output has reached the max limit
-     * @param outputLines <p>The currently readable lines in the console output field.</p>
+     * @param outputLines <p>The currently readable lines in the console output field</p>
      */
     private void truncateConsole(int outputLines) {
         String oldText = this.textOutput.getText();
@@ -123,7 +123,7 @@ public class Console extends KeyAdapter implements ActionListener, KeyListener {
      * Shows the previously executed command in the input field
      *
      * <p>Shows the previously executed command if a command was just executed.
-     * Shows the command executed earlier if already showing a previously executed command.</p>
+     * Shows the command executed earlier if already showing a previously executed command</p>
      */
     private void showPreviousCommand() {
         if (commands.size() > 0 && commandIndex > 0) {
@@ -135,7 +135,7 @@ public class Console extends KeyAdapter implements ActionListener, KeyListener {
      * Shows the next previously executed command or clears the input field
      *
      * <p>Shows the next previously executed command if such a command exists.
-     * Clears the input field if no next used command exists.</p>
+     * Clears the input field if no next used command exists</p>
      */
     private void showNextCommand() {
         if (commands.size() > 0) {

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

@@ -100,12 +100,24 @@ public final class CommonFunctions {
      *
      * @param path <p>The full url of the file to readFromServer</p>
      * @return <p>True if successful. False otherwise</p>
+     * @throws IOException <p>If unable to find or read the file</p>
      */
-    public static String readFile(String path) throws IOException {
+    public static String readRemoteFile(String path) throws IOException {
         URL url = new URL(path);
         return new Scanner(url.openStream()).useDelimiter("\\Z").next();
     }
 
+    /**
+     * Reads a file from disk
+     *
+     * @param path <p>The path of the file to read</p>
+     * @return <p>The contents of the file</p>
+     * @throws IOException <p>If unable to find or read the file</p>
+     */
+    public static String readFile(String path) throws IOException {
+        return CommonFunctions.readBufferedReader(new BufferedReader(new InputStreamReader(new FileInputStream(path))));
+    }
+
     /**
      * Downloads a file from a website and replaces the target file
      *

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

@@ -1,6 +1,7 @@
 package net.knarcraft.minecraftserverlauncher.utility;
 
 import net.knarcraft.minecraftserverlauncher.Main;
+import net.knarcraft.minecraftserverlauncher.server.ServerVersionContainer;
 
 import java.io.BufferedReader;
 import java.io.BufferedWriter;
@@ -12,13 +13,14 @@ import java.nio.file.Paths;
 
 public class JarBuilder {
 
-    private String downloadedBuildToolsVersion = "#124";
     private final String buildDirectory;
     private final String jarDirectory;
+    private final ServerVersionContainer versionContainer;
 
-    public JarBuilder(String buildDirectory, String jarDirectory) {
+    public JarBuilder(String buildDirectory, String jarDirectory, ServerVersionContainer versionContainer) {
         this.buildDirectory = buildDirectory;
         this.jarDirectory = jarDirectory;
+        this.versionContainer = versionContainer;
     }
 
     /**
@@ -26,7 +28,7 @@ public class JarBuilder {
      */
     public void buildSpigotJar() {
         downloadBuildTools();
-        ProcessBuilder processBuilder = new ProcessBuilder("C:\\Program Files\\Java\\jdk-16.0.1\\bin\\java.exe", "-jar", "BuildTools.jar", "--rev",
+        ProcessBuilder processBuilder = new ProcessBuilder("java", "-jar", "BuildTools.jar", "--rev",
                 "latest", "--output-dir", jarDirectory);
         executeBuildProcess(processBuilder);
         System.out.println("Finished building spigot .jar. Moving it to the correct location");
@@ -39,7 +41,7 @@ public class JarBuilder {
      */
     public void buildBukkitJar() {
         downloadBuildTools();
-        ProcessBuilder processBuilder = new ProcessBuilder("C:\\Program Files\\Java\\jdk-16.0.1\\bin\\java.exe", "-jar", "BuildTools.jar", "--compile",
+        ProcessBuilder processBuilder = new ProcessBuilder("java", "-jar", "BuildTools.jar", "--compile",
                 "craftbukkit", "--rev", "latest", "--output-dir", jarDirectory);
         executeBuildProcess(processBuilder);
         System.out.println("Finished building craftbukkit .jar. Moving it to the correct location");
@@ -53,11 +55,16 @@ public class JarBuilder {
     public void downloadBuildTools() {
         try {
             String latestVersion = getLatestBuildToolsVersion();
-            if (!latestVersion.equals(downloadedBuildToolsVersion)) {
-                boolean success = CommonFunctions.downloadFile("https://hub.spigotmc.org/jenkins/job/BuildTools/" +
-                        "lastSuccessfulBuild/artifact/target/BuildTools.jar", Paths.get(buildDirectory + "BuildTools.jar"));
+            boolean exists = new File(buildDirectory + "BuildTools.jar").exists();
+            boolean isUpdated = latestVersion.equals(versionContainer.getDownloadedBuildToolsVersion());
+
+            if (!exists || !isUpdated) {
+                String buildToolsURL = "https://hub.spigotmc.org/jenkins/job/BuildTools/lastSuccessfulBuild/artifact/target/BuildTools.jar";
+                boolean success = CommonFunctions.downloadFile(buildToolsURL, Paths.get(buildDirectory + "BuildTools.jar"));
                 if (!success) {
                     Main.getController().getGUI().setStatus("Unable to download the latest BuildTools");
+                } else {
+                    versionContainer.setDownloadedBuildToolsVersion(latestVersion);
                 }
             }
         } catch (IOException e) {
@@ -120,7 +127,7 @@ public class JarBuilder {
      */
     String getLatestBuildToolsVersion() throws IOException {
         String versionDocument;
-        versionDocument = CommonFunctions.readFile("https://hub.spigotmc.org/jenkins/job/BuildTools/lastSuccessfulBuild/");
+        versionDocument = CommonFunctions.readRemoteFile("https://hub.spigotmc.org/jenkins/job/BuildTools/lastSuccessfulBuild/");
         return CommonFunctions.stringBetween(versionDocument, "BuildTools #", " [");
     }
 

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

@@ -13,7 +13,7 @@ import java.util.Scanner;
 
 import static net.knarcraft.minecraftserverlauncher.utility.CommonFunctions.downloadFile;
 import static net.knarcraft.minecraftserverlauncher.utility.CommonFunctions.getResourceAsScanner;
-import static net.knarcraft.minecraftserverlauncher.utility.CommonFunctions.readFile;
+import static net.knarcraft.minecraftserverlauncher.utility.CommonFunctions.readRemoteFile;
 
 /**
  * A utility used for updating the software
@@ -44,7 +44,7 @@ public final class Updater {
         String oldVer = file.nextLine();
         file.close();
 
-        String data = readFile(updateURL);
+        String data = readRemoteFile(updateURL);
         JsonObject jsonObject = new JsonParser().parse(data).getAsJsonObject();
         String latest = jsonObject.getAsJsonObject("latest").get(updateChannel).getAsString();
 

src/test/java/net/knarcraft/minecraftserverlauncher/utility/JarBuilderTest.java

@@ -1,6 +1,7 @@
 package net.knarcraft.minecraftserverlauncher.utility;
 
 import net.knarcraft.minecraftserverlauncher.Main;
+import net.knarcraft.minecraftserverlauncher.server.ServerVersionContainer;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.MethodOrderer;
 import org.junit.jupiter.api.Order;
@@ -26,7 +27,7 @@ public class JarBuilderTest {
                 "BuildTools" + File.separator;
         jarDirectory = Main.getApplicationWorkDirectory() + File.separator + "files" + File.separator +
                 "testjars" + File.separator;
-        jarBuilder = new JarBuilder(targetDirectory, jarDirectory);
+        jarBuilder = new JarBuilder(targetDirectory, jarDirectory, ServerVersionContainer.getInstance());
         removeBuildToolsFiles();
     }