Fixes some code style issues, and attempts to fix test failures

src/main/java/net/knarcraft/stargate/command/ConfigTabCompleter.java

@@ -116,13 +116,13 @@ public class ConfigTabCompleter implements TabCompleter {
      * @param args           <p>The arguments given by the user</p>
      * @return <p>Some or all of the valid values for the option</p>
      */
-    @Nullable
+    @NotNull
     private List<String> getPossibleStringListOptionValues(@NotNull ConfigOption selectedOption,
                                                            @NotNull String[] args) {
         if (selectedOption == ConfigOption.PER_SIGN_COLORS) {
             return getPerSignColorCompletion(args);
         } else {
-            return null;
+            return new ArrayList<>();
         }
     }
 

src/main/java/net/knarcraft/stargate/config/LanguageLoader.java

@@ -11,9 +11,8 @@ import java.io.BufferedWriter;
 import java.io.File;
 import java.io.IOException;
 import java.io.InputStream;
-import java.util.HashMap;
+import java.util.EnumMap;
 import java.util.Map;
-import java.util.Set;
 
 /**
  * This class is responsible for loading all strings which are translated into several languages
@@ -153,11 +152,14 @@ public final class LanguageLoader {
 
         //If a key is not found in the language file, add the one in the internal file. Must update the external file
         if (!internalLanguageValues.keySet().equals(currentLanguageValues.keySet())) {
-            Map<Message, String> newLanguageValues = new HashMap<>();
+            Map<Message, String> newLanguageValues = new EnumMap<>(Message.class);
             boolean updateNecessary = false;
-            for (Message key : internalLanguageValues.keySet()) {
+            for (Map.Entry<Message, String> entry : internalLanguageValues.entrySet()) {
+                Message key = entry.getKey();
+                String value = entry.getValue();
+
                 if (currentLanguageValues.get(key) == null) {
-                    newLanguageValues.put(key, internalLanguageValues.get(key));
+                    newLanguageValues.put(key, value);
                     //Found at least one value in the internal file not in the external file. Need to update
                     updateNecessary = true;
                 } else {
@@ -186,15 +188,15 @@ public final class LanguageLoader {
         BufferedWriter bufferedWriter = FileHelper.getBufferedWriterFromString(languageFolder + language + ".txt");
 
         //Output normal Language data
-        for (Message key : languageStrings.keySet()) {
+        for (Map.Entry<Message, String> entry : languageStrings.entrySet()) {
-            bufferedWriter.write(key + "=" + languageStrings.get(key));
+            bufferedWriter.write(entry.getKey() + "=" + entry.getValue());
             bufferedWriter.newLine();
         }
         bufferedWriter.newLine();
         //Output any custom language strings the user had
         if (customLanguageStrings != null) {
-            for (Message key : customLanguageStrings.keySet()) {
+            for (Map.Entry<Message, String> entry : customLanguageStrings.entrySet()) {
-                bufferedWriter.write(key + "=" + customLanguageStrings.get(key));
+                bufferedWriter.write(entry.getKey() + "=" + entry.getValue());
                 bufferedWriter.newLine();
             }
         }
@@ -240,25 +242,24 @@ public final class LanguageLoader {
      */
     public void debug() {
         if (loadedStringTranslations != null) {
-            Set<Message> keys = loadedStringTranslations.keySet();
+            for (Map.Entry<Message, String> entry : loadedStringTranslations.entrySet()) {
-            for (Message key : keys) {
+                Stargate.debug("LanguageLoader::Debug::loadedStringTranslations", entry.getKey() +
-                Stargate.debug("LanguageLoader::Debug::loadedStringTranslations", key + " => " +
+                        " => " + entry.getValue());
-                        loadedStringTranslations.get(key));
             }
         }
         if (loadedBackupStrings == null) {
             return;
         }
-        Set<Message> keys = loadedBackupStrings.keySet();
+
-        for (Message key : keys) {
+        for (Map.Entry<Message, String> entry : loadedBackupStrings.entrySet()) {
-            Stargate.debug("LanguageLoader::Debug::loadedBackupStrings", key + " => " +
+            Stargate.debug("LanguageLoader::Debug::loadedBackupStrings", entry.getKey() + " => " +
-                    loadedBackupStrings.get(key));
+                    entry.getValue());
         }
     }
 
     @NotNull
     private Map<Message, String> fromStringMap(@NotNull Map<String, String> configurationStrings) {
-        Map<Message, String> output = new HashMap<>();
+        Map<Message, String> output = new EnumMap<>(Message.class);
         for (Map.Entry<String, String> entry : configurationStrings.entrySet()) {
             Message message = Message.getFromKey(entry.getKey());
             if (message == null) {

src/main/java/net/knarcraft/stargate/config/StargateConfig.java

@@ -30,6 +30,8 @@ import java.util.Queue;
 import java.util.Set;
 import java.util.concurrent.ConcurrentLinkedQueue;
 import java.util.logging.Logger;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
 
 /**
  * The stargate config is responsible for keeping track of all configuration values
@@ -429,10 +431,14 @@ public final class StargateConfig {
         portalFolder = (String) configOptions.get(ConfigOption.PORTAL_FOLDER);
         if (portalFolder.isEmpty()) {
             portalFolder = dataFolderPath + "/portals/";
+        } else {
+            portalFolder = replacePluginFolderPath(portalFolder);
         }
         gateFolder = (String) configOptions.get(ConfigOption.GATE_FOLDER);
         if (gateFolder.isEmpty()) {
             gateFolder = dataFolderPath + "/gates/";
+        } else {
+            gateFolder = replacePluginFolderPath(gateFolder);
         }
 
         //If users have an outdated config, assume they also need to update their default gates
@@ -450,6 +456,23 @@ public final class StargateConfig {
         Stargate.getInstance().saveConfig();
     }
 
+    /**
+     * Replaces "plugins/Stargate" in a folder path, and replaces it with the full path relative to the data folder
+     *
+     * @param input <p>The input string to replace in</p>
+     * @return <p>The replaced path, or the input if not applicable</p>
+     */
+    @NotNull
+    private String replacePluginFolderPath(@NotNull String input) {
+        Pattern pattern = Pattern.compile("(?i)^plugins/Stargate");
+        Matcher matcher = pattern.matcher(input);
+        if (matcher.matches()) {
+            return dataFolderPath + matcher.replaceAll("");
+        } else {
+            return input;
+        }
+    }
+
     /**
      * Gets the object containing configuration values regarding gates
      *

src/main/java/net/knarcraft/stargate/listener/PlayerEventListener.java

@@ -254,18 +254,8 @@ public class PlayerEventListener implements Listener {
         }
 
         //Allow players with permissions to apply dye to signs
-        EquipmentSlot hand = event.getHand();
+        if (dyeSign(event, player, portal)) {
-        if (hand != null && (PermissionHelper.hasPermission(player, "stargate.admin.dye") ||
+            return;
-                portal.isOwner(player))) {
-            ItemStack item = player.getInventory().getItem(hand);
-            if (item != null) {
-                String itemName = item.getType().toString();
-                if (itemName.endsWith("DYE") || itemName.endsWith("INK_SAC")) {
-                    event.setUseInteractedBlock(Event.Result.ALLOW);
-                    Bukkit.getScheduler().scheduleSyncDelayedTask(Stargate.getInstance(), portal::drawSign, 1);
-                    return;
-                }
-            }
         }
 
         event.setUseInteractedBlock(Event.Result.DENY);
@@ -295,6 +285,39 @@ public class PlayerEventListener implements Listener {
         }
     }
 
+    /**
+     * Tries to take care of a sign dye interaction
+     *
+     * @param event  <p>The triggered player interaction event</p>
+     * @param player <p>The involved player</p>
+     * @param portal <p>The involved portal</p>
+     * @return <p>True if a sign was dyed</p>
+     */
+    private boolean dyeSign(@NotNull PlayerInteractEvent event, @NotNull Player player, @NotNull Portal portal) {
+        EquipmentSlot hand = event.getHand();
+        // Check if the player is allowed to dye the sign
+        if (hand == null || (!PermissionHelper.hasPermission(player, "stargate.admin.dye") &&
+                !portal.isOwner(player))) {
+            return false;
+        }
+
+        // Check if the player is holding an item
+        ItemStack item = player.getInventory().getItem(hand);
+        if (item == null) {
+            return false;
+        }
+
+        String itemName = item.getType().toString();
+        // Check if the player's item can be used to dye the sign
+        if (itemName.endsWith("DYE") || itemName.endsWith("INK_SAC")) {
+            event.setUseInteractedBlock(Event.Result.ALLOW);
+            Bukkit.getScheduler().scheduleSyncDelayedTask(Stargate.getInstance(), portal::drawSign, 1);
+            return true;
+        } else {
+            return false;
+        }
+    }
+
     /**
      * Check if a player should be denied from accessing (using) a portal
      *

src/main/java/net/knarcraft/stargate/listener/VehicleEventListener.java

@@ -15,6 +15,7 @@ import org.bukkit.event.EventHandler;
 import org.bukkit.event.Listener;
 import org.bukkit.event.vehicle.VehicleMoveEvent;
 import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
 
 import java.util.List;
 
@@ -92,48 +93,27 @@ public class VehicleEventListener implements Listener {
             rootEntity = rootEntity.getVehicle();
         }
         List<Player> players = TeleportHelper.getPlayers(rootEntity.getPassengers());
-        Portal destinationPortal = null;
+        Portal destinationPortal = getDestinationPortal(players, entrancePortal);
-
-        for (Player player : players) {
-            //The entrance portal must be open for one player for the teleportation to happen
-            if (!entrancePortal.getPortalOpener().isOpenFor(player)) {
-                continue;
-            }
-
-            //Check if any of the players has selected the destination
-            Portal possibleDestinationPortal = entrancePortal.getPortalActivator().getDestination(player);
-            if (possibleDestinationPortal != null) {
-                destinationPortal = possibleDestinationPortal;
-                break;
-            }
-        }
 
         //Cancel the teleport if no players activated the portal, or if any players are denied access
-        boolean cancelTeleport = false;
+        boolean cancelTeleportation = false;
         for (Player player : players) {
             if (destinationPortal == null) {
-                cancelTeleport = true;
+                cancelTeleportation = true;
                 if (!entrancePortal.getOptions().isSilent()) {
                     Stargate.getMessageSender().sendErrorMessage(player, Stargate.getString(Message.INVALID_DESTINATION));
                 }
             } else if (!TeleportHelper.playerCanTeleport(player, entrancePortal, destinationPortal)) {
-                cancelTeleport = true;
+                cancelTeleportation = true;
             }
         }
-        if (cancelTeleport || destinationPortal == null) {
+        if (cancelTeleportation || destinationPortal == null) {
             return;
         }
 
         //Take payment from all players
-        for (Player player : players) {
+        if (!takePayment(players, entrancePortal, destinationPortal)) {
-            //To prevent the case where the first passenger pays and then the second passenger is denied, this has to be
+            return;
-            // run after it has been confirmed that all passengers are able to pay
-            int cost = EconomyHelper.getUseCost(player, entrancePortal, destinationPortal);
-            if (cost > 0) {
-                if (EconomyHelper.cannotPayTeleportFee(entrancePortal, player, cost)) {
-                    return;
-                }
-            }
         }
 
         //Teleport the vehicle and inform the user if the vehicle was teleported
@@ -148,4 +128,54 @@ public class VehicleEventListener implements Listener {
         }
     }
 
+    /**
+     * Tries to get the destination portal selected by one of the players included in the teleportation
+     *
+     * @param players        <p>The players to be teleported</p>
+     * @param entrancePortal <p>The portal the players are entering</p>
+     * @return <p>The destination portal, or null if not found</p>
+     */
+    @Nullable
+    private static Portal getDestinationPortal(@NotNull List<Player> players, @NotNull Portal entrancePortal) {
+        for (Player player : players) {
+            //The entrance portal must be open for one player for the teleportation to happen
+            if (!entrancePortal.getPortalOpener().isOpenFor(player)) {
+                continue;
+            }
+
+            //Check if any of the players has selected the destination
+            Portal possibleDestinationPortal = entrancePortal.getPortalActivator().getDestination(player);
+            if (possibleDestinationPortal != null) {
+                return possibleDestinationPortal;
+            }
+        }
+
+        return null;
+    }
+
+    /**
+     * Takes payment for the given players
+     *
+     * @param players           <p>The players to take payment from</p>
+     * @param entrancePortal    <p>The portal the players are travelling from</p>
+     * @param destinationPortal <p>The portal the players are travelling to</p>
+     * @return <p>True if payment was successfully taken, false otherwise</p>
+     */
+    private static boolean takePayment(@NotNull List<Player> players, @NotNull Portal entrancePortal,
+                                       @NotNull Portal destinationPortal) {
+        for (Player player : players) {
+            //To prevent the case where the first passenger pays and then the second passenger is denied, this has to be
+            // run after it has been confirmed that all passengers are able to pay. Also note that some players might 
+            // not have to pay, and thus the cost check has to be in the loop,
+            int cost = EconomyHelper.getUseCost(player, entrancePortal, destinationPortal);
+            if (cost > 0) {
+                if (EconomyHelper.cannotPayTeleportFee(entrancePortal, player, cost)) {
+                    return false;
+                }
+            }
+        }
+
+        return true;
+    }
+
 }