Replaces enum-utility-pattern classes with regular noninstantiable classes

application/src/main/java/org/togetherjava/tjbot/Application.java

@@ -27,8 +27,10 @@
  * New commands can be created by implementing {@link SlashCommandInteractionEvent} or extending
  * {@link SlashCommandAdapter}. They can then be registered in {@link Features}.
  */
-public enum Application {
-    ;
+public class Application {
+    private Application() {
+        throw new UnsupportedOperationException("Utility class, construction not supported");
+    }
 
     private static final Logger logger = LoggerFactory.getLogger(Application.class);
     private static final String DEFAULT_CONFIG_PATH = "config.json";

application/src/main/java/org/togetherjava/tjbot/BootstrapLauncher.java

@@ -4,8 +4,10 @@
  * A bootstrap launcher with minimal dependencies that sets up needed parts and workarounds for the
  * main logic to take over.
  */
-public enum BootstrapLauncher {
-    ;
+public class BootstrapLauncher {
+    private BootstrapLauncher() {
+        throw new UnsupportedOperationException("Utility class, construction not supported");
+    }
 
     /**
      * Starts the main application.

application/src/main/java/org/togetherjava/tjbot/commands/Features.java

@@ -39,8 +39,10 @@
  * To add a new slash command, extend the commands returned by
  * {@link #createFeatures(JDA, Database, Config)}.
  */
-public enum Features {
-    ;
+public class Features {
+    private Features() {
+        throw new UnsupportedOperationException("Utility class, construction not supported");
+    }
 
     /**
      * Creates all features that should be registered with this application.

application/src/main/java/org/togetherjava/tjbot/commands/mathcommands/wolframalpha/WolframAlphaImages.java

@@ -25,8 +25,7 @@
  * Utility class to work with images returned by the Wolfram Alpha API. For example to render and
  * combine them.
  */
-enum WolframAlphaImages {
-    ;
+class WolframAlphaImages {
     static final String IMAGE_FORMAT = "png";
     private static final Color IMAGE_BACKGROUND = Color.WHITE;
     private static final int IMAGE_MARGIN_PX = 10;
@@ -35,7 +34,10 @@ enum WolframAlphaImages {
             new FontRenderContext(new AffineTransform(), true, true);
     private static final Color TITLE_COLOR = Color.decode("#3C3C3C");
     private static final Font TITLE_FONT = new Font("Arial", Font.BOLD, 15);
-    private static final int TITLE_HEIGHT_PX = 20;
+
+    private WolframAlphaImages() {
+        throw new UnsupportedOperationException("Utility class, construction not supported");
+    }
 
     static @NotNull BufferedImage renderTitle(@NotNull String title) {
         Rectangle2D titleBounds = TITLE_FONT.getStringBounds(title, TITLE_RENDER_CONTEXT);

application/src/main/java/org/togetherjava/tjbot/commands/moderation/ModerationUtils.java

@@ -21,8 +21,10 @@
 /**
  * Utility class offering helpers revolving around user moderation, such as banning or kicking.
  */
-public enum ModerationUtils {
-    ;
+public class ModerationUtils {
+    private ModerationUtils() {
+        throw new UnsupportedOperationException("Utility class, construction not supported");
+    }
 
     private static final Logger logger = LoggerFactory.getLogger(ModerationUtils.class);
     /**

application/src/main/java/org/togetherjava/tjbot/commands/utils/Hashing.java

@@ -10,8 +10,10 @@
 /**
  * Utility for hashing data.
  */
-public enum Hashing {
-    ;
+public class Hashing {
+    private Hashing() {
+        throw new UnsupportedOperationException("Utility class, construction not supported");
+    }
 
     /**
      * All characters available in the hexadecimal-system, as UTF-8 encoded array.

application/src/main/java/org/togetherjava/tjbot/commands/utils/MessageUtils.java

@@ -14,8 +14,10 @@
  * This class is meant to contain all utility methods for {@link Message} that can be used on all
  * other commands to avoid similar methods appearing everywhere.
  */
-public enum MessageUtils {
-    ;
+public class MessageUtils {
+    private MessageUtils() {
+        throw new UnsupportedOperationException("Utility class, construction not supported");
+    }
 
     /**
      * Disables all the buttons that a message has. Disabling buttons deems it as not clickable to

application/src/main/java/org/togetherjava/tjbot/commands/utils/StringDistances.java

@@ -11,8 +11,10 @@
 /**
  * Utility class for computing string distances, for example the edit distance between two words.
  */
-public enum StringDistances {
-    ;
+public class StringDistances {
+    private StringDistances() {
+        throw new UnsupportedOperationException("Utility class, construction not supported");
+    }
 
     /**
      * Computes the candidate that matches the given query string best.