Update gradle stage in Jenkinsfile

Jenkinsfile

@@ -3,7 +3,13 @@ pipeline {
     stages {
         stage('Gradle') {
             steps {
-                sh './gradlew build'
+                withCredentials([usernamePassword(credentialsId: 'alttd-snapshot-user', usernameVariable: 'USERNAME', passwordVariable: 'PASSWORD')]) {
+                sh '''
+                  set +x
+                  chmod +x gradlew
+                  ./gradlew build -PalttdSnapshotUsername=$USERNAME -PalttdSnapshotPassword=$PASSWORD
+                '''
+                }
             }
         }
         stage('Archive') {

build.gradle.kts

@@ -1,19 +1,19 @@
 import java.io.ByteArrayOutputStream
 import java.io.FileOutputStream
 import java.net.URL
+import net.minecrell.pluginyml.bukkit.BukkitPluginDescription
+import net.minecrell.pluginyml.paper.PaperPluginDescription
 
 plugins {
     `java-library`
     `maven-publish`
     id("xyz.jpenilla.run-paper") version "2.3.0"
-    id("net.minecrell.plugin-yml.bukkit") version "0.6.0"
+    id("de.eldoria.plugin-yml.paper") version "0.8.0"
 }
 
 dependencies {
-    compileOnly("com.alttd.cosmos:cosmos-api:1.21.8-R0.1-SNAPSHOT") {
-        isChanging = true
-    }
-    compileOnly("com.alttd.altitudeapi:AltitudeAPI:0.0.3")
+    compileOnly("com.alttd.cosmos:cosmos-api:26.2.build.17-stable")
+//    compileOnly("com.alttd.altitudeapi:AltitudeAPI:0.0.3")
     compileOnly("com.github.decentsoftware-eu:decentholograms:2.8.9")
     compileOnly("org.jetbrains:annotations:16.0.2")
     testImplementation("org.powermock:powermock-module-junit4:1.7.4")
@@ -21,16 +21,9 @@ dependencies {
 }
 
 group = "com.alttd.altitudetag"
-version = System.getenv("BUILD_NUMBER") ?: gitCommit()
+version = System.getenv("BUILD_NUMBER") ?: "DEV-BUILD"
 description = "AltitudeTag"
 
-java {
-    toolchain {
-        languageVersion.set(JavaLanguageVersion.of(21))
-    }
-}
-
-
 publishing {
     publications {
         create<MavenPublication>("mavenJava") {
@@ -69,17 +62,17 @@ tasks {
         }
         runDirectory.set(dir)
 
-        val fileName = "/galaxy.jar"
+        val fileName = "/cosmos.jar"
         val file = File(dir.path + fileName)
 
         if (!file.parentFile.exists()) {
             file.parentFile.mkdirs()
         }
         if (!file.exists()) {
-            download("https://repo.destro.xyz/private/com/alttd/Galaxy-Server/Galaxy-paperclip-1.20.4-R0.1-SNAPSHOT-reobf.jar", file)
+            download("https://jenkins.destro.xyz/job/Cosmos/lastSuccessfulBuild/artifact/cosmos-server/build/libs/cosmos-paperclip-26.2.build.17-stable.jar", file)
         }
         serverJar(file)
-        minecraftVersion("1.20.4")
+        minecraftVersion("26.2")
     }
 }
 
@@ -91,20 +84,37 @@ fun download(link: String, path: File) {
     }
 }
 
-fun gitCommit(): String {
-    val os = ByteArrayOutputStream()
-    project.exec {
-        commandLine = "git rev-parse --short HEAD".split(" ")
-        standardOutput = os
-    }
-    return String(os.toByteArray()).trim()
-}
-
-bukkit {
+paper {
     name = rootProject.name
     main = "$group.${rootProject.name}"
+    bootstrapper = "$group.${rootProject.name}Bootstrap"
     version = "${rootProject.version}"
     apiVersion = "1.21"
     authors = listOf("Michael Ziluck", "destro174")
-    depend = listOf("DecentHolograms")
+    serverDependencies {
+        register("DecentHolograms") {
+            load = PaperPluginDescription.RelativeLoadOrder.BEFORE
+        }
+    }
+    permissions {
+        register("tag.play") {
+            description = "Base permission for the ${rootProject.name} plugin."
+            default = BukkitPluginDescription.Permission.Default.FALSE
+        }
+        register("tag.commands.admin") {
+            description = "Admin permission for the ${rootProject.name} plugin."
+            default = BukkitPluginDescription.Permission.Default.FALSE
+            children = listOf(
+                "tag.play"
+            )
+        }
+        register("tag.commands.admin.location") {
+            description = "Admin permission for setting the scoreboard location."
+            default = BukkitPluginDescription.Permission.Default.FALSE
+            children = listOf(
+                "tag.play",
+                "tag.commands.admin"
+            )
+        }
+    }
 }

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,7 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.5-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.4.1-bin.zip
 networkTimeout=10000
+validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists

gradlew

@@ -1,7 +1,7 @@
 #!/bin/sh
 
 #
-# Copyright © 2015-2021 the original authors.
+# Copyright © 2015 the original authors.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -15,6 +15,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
+# SPDX-License-Identifier: Apache-2.0
+#
 
 ##############################################################################
 #
@@ -55,7 +57,7 @@
 #       Darwin, MinGW, and NonStop.
 #
 #   (3) This script is generated from the Groovy template
-#       https://github.com/gradle/gradle/blob/HEAD/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       https://github.com/gradle/gradle/blob/HEAD/platforms/jvm/plugins-application/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
 #       within the Gradle project.
 #
 #       You can find Gradle at https://github.com/gradle/gradle/.
@@ -83,10 +85,8 @@ done
 # This is normally unused
 # shellcheck disable=SC2034
 APP_BASE_NAME=${0##*/}
-APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
-
-# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
-DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
+APP_HOME=$( cd -P "${APP_HOME:-./}" > /dev/null && printf '%s\n' "$PWD" ) || exit
 
 # Use the maximum available, or set MAX_FD != -1 to use that value.
 MAX_FD=maximum
@@ -114,7 +114,7 @@ case "$( uname )" in                #(
   NONSTOP* )        nonstop=true ;;
 esac
 
-CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+CLASSPATH="\\\"\\\""
 
 
 # Determine the Java command to use to start the JVM.
@@ -133,10 +133,13 @@ location of your Java installation."
     fi
 else
     JAVACMD=java
-    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+    if ! command -v java >/dev/null 2>&1
+    then
+        die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
 
 Please set the JAVA_HOME variable in your environment to match the
 location of your Java installation."
+    fi
 fi
 
 # Increase the maximum file descriptors if we can.
@@ -144,7 +147,7 @@ if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
     case $MAX_FD in #(
       max*)
         # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
-        # shellcheck disable=SC3045
+        # shellcheck disable=SC2039,SC3045
         MAX_FD=$( ulimit -H -n ) ||
             warn "Could not query maximum file descriptor limit"
     esac
@@ -152,7 +155,7 @@ if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
       '' | soft) :;; #(
       *)
         # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
-        # shellcheck disable=SC3045
+        # shellcheck disable=SC2039,SC3045
         ulimit -n "$MAX_FD" ||
             warn "Could not set maximum file descriptor limit to $MAX_FD"
     esac
@@ -197,16 +200,20 @@ if "$cygwin" || "$msys" ; then
     done
 fi
 
-# Collect all arguments for the java command;
-#   * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of
-#     shell script including quotes and variable substitutions, so put them in
-#     double quotes to make sure that they get re-expanded; and
-#   * put everything else in single quotes, so that it's not re-expanded.
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Collect all arguments for the java command:
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
+#     and any embedded shellness will be escaped.
+#   * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
+#     treated as '${Hostname}' itself on the command line.
 
 set -- \
         "-Dorg.gradle.appname=$APP_BASE_NAME" \
         -classpath "$CLASSPATH" \
-        org.gradle.wrapper.GradleWrapperMain \
+        -jar "$APP_HOME/gradle/wrapper/gradle-wrapper.jar" \
         "$@"
 
 # Stop when "xargs" is not available.

gradlew.bat

@@ -13,6 +13,8 @@
 @rem See the License for the specific language governing permissions and
 @rem limitations under the License.
 @rem
+@rem SPDX-License-Identifier: Apache-2.0
+@rem
 
 @if "%DEBUG%"=="" @echo off
 @rem ##########################################################################
@@ -43,11 +45,11 @@ set JAVA_EXE=java.exe
 %JAVA_EXE% -version >NUL 2>&1
 if %ERRORLEVEL% equ 0 goto execute
 
-echo.
-echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
-echo.
-echo Please set the JAVA_HOME variable in your environment to match the
-echo location of your Java installation.
+echo. 1>&2
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
 
 goto fail
 
@@ -57,22 +59,22 @@ set JAVA_EXE=%JAVA_HOME%/bin/java.exe
 
 if exist "%JAVA_EXE%" goto execute
 
-echo.
-echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
-echo.
-echo Please set the JAVA_HOME variable in your environment to match the
-echo location of your Java installation.
+echo. 1>&2
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
 
 goto fail
 
 :execute
 @rem Setup the command line
 
-set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+set CLASSPATH=
 
 
 @rem Execute Gradle
-"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" -jar "%APP_HOME%\gradle\wrapper\gradle-wrapper.jar" %*
 
 :end
 @rem End local scope for the variables with windows NT shell

settings.gradle.kts

@@ -1,15 +1,25 @@
 rootProject.name = "AltitudeTag"
 
+val nexusUser = providers.gradleProperty("alttdSnapshotUsername").orNull ?: System.getenv("NEXUS_USERNAME")
+val nexusPass = providers.gradleProperty("alttdSnapshotPassword").orNull ?: System.getenv("NEXUS_PASSWORD")
+
 dependencyResolutionManagement {
     repositories {
         mavenLocal()
         mavenCentral()
         maven {
-            name = "AlttdNexus"
-            url = uri(
-                "https://repo.alttd.com/repository/alttd-snapshot/"
-            )
-            credentials(PasswordCredentials::class)
+            url = uri("https://repo.alttd.com/repository/alttd-snapshot/")
+            credentials {
+                username = nexusUser
+                password = nexusPass
+            }
+        }
+        maven {
+            url = uri("https://repo.alttd.com/repository/alttd/")
+            credentials {
+                username = nexusUser
+                password = nexusPass
+            }
         }
         maven("https://repo.destro.xyz/snapshots")
         maven("https://repo.codemc.io/repository/maven-public/")

src/main/java/com/alttd/altitudetag/AltitudeTag.java

@@ -1,20 +1,23 @@
 package com.alttd.altitudetag;
 
 import java.io.File;
+import java.util.List;
 import java.util.Optional;
 import java.util.UUID;
 import java.util.function.Consumer;
 
-import com.alttd.altitudeapi.commands.CommandHandler;
-import com.alttd.altitudeapi.commands.CommandLang;
 import com.alttd.altitudetag.commands.TagCommand;
 import com.alttd.altitudetag.configuration.Config;
 import com.alttd.altitudetag.configuration.Lang;
 import com.alttd.altitudetag.listeners.ConnectionListener;
 import com.alttd.altitudetag.listeners.InteractListener;
+import io.papermc.paper.command.brigadier.Commands;
+import io.papermc.paper.plugin.lifecycle.event.LifecycleEventManager;
+import io.papermc.paper.plugin.lifecycle.event.types.LifecycleEvents;
 import org.bukkit.Bukkit;
 import org.bukkit.boss.BossBar;
 import org.bukkit.entity.Player;
+import org.bukkit.plugin.Plugin;
 import org.bukkit.plugin.java.JavaPlugin;
 import org.bukkit.scheduler.BukkitTask;
 import org.jetbrains.annotations.NotNull;
@@ -48,13 +51,6 @@ public class AltitudeTag extends JavaPlugin
 
         reloadConfiguration();
 
-        // update the CommandLang values
-        CommandLang.NO_PERMISSION.setValue(Lang.NO_PERMS.getRawMessage()[0]);
-        CommandLang.HEADER_FOOTER.setValue(Lang.HEADER_FOOTER.getRawMessage()[0]);
-        CommandLang.NO_SUBS.setValue(Lang.NO_SUBS.getRawMessage()[0]);
-        CommandLang.ONLY_PLAYERS.setValue(Lang.ONLY_PLAYERS.getRawMessage()[0]);
-        CommandLang.USAGE_FORMAT.setValue(Lang.USAGE.getRawMessage()[0]);
-
         try
         {
             TagConnection.initialize();
@@ -71,11 +67,18 @@ public class AltitudeTag extends JavaPlugin
 
         NotificationHandler.loadBossBar();
 
-        CommandHandler.initialize();
-        CommandHandler.getInstance().registerCommand(new TagCommand(), this);
-
         Bukkit.getPluginManager().registerEvents(new ConnectionListener(), this);
         Bukkit.getPluginManager().registerEvents(new InteractListener(), this);
+
+        registerCommands();
+    }
+
+    private void registerCommands() {
+        LifecycleEventManager<Plugin> manager = this.getLifecycleManager();
+        manager.registerEventHandler(LifecycleEvents.COMMANDS, event -> {
+            final Commands commands = event.registrar();
+            commands.register(new TagCommand().command(), "Tag, you're it!", List.of("tags", "tagging", "tagger"));
+        });
     }
 
     private static void reloadConfiguration()

src/main/java/com/alttd/altitudetag/AltitudeTagBootstrap.java

@@ -0,0 +1,13 @@
+package com.alttd.altitudetag;
+
+
+import io.papermc.paper.plugin.bootstrap.BootstrapContext;
+import io.papermc.paper.plugin.bootstrap.PluginBootstrap;
+
+@SuppressWarnings("UnstableApiUsage")
+public class AltitudeTagBootstrap implements PluginBootstrap {
+
+    @Override
+    public void bootstrap(BootstrapContext context) {}
+
+}

src/main/java/com/alttd/altitudetag/Permission.java

@@ -1,20 +0,0 @@
-package com.alttd.altitudetag;
-
-public enum Permission
-{
-    COMMAND_ADMIN("tag.commands.admin"),
-    COMMAND_ADMIN_LOCATION("tag.commands.admin.location");
-
-    private String permission;
-
-    private Permission(String permission)
-    {
-        this.permission = permission;
-    }
-
-    public String getPermission()
-    {
-        return permission;
-    }
-
-}

src/main/java/com/alttd/altitudetag/commands/TagAdminCommand.java

@@ -1,15 +0,0 @@
-package com.alttd.altitudetag.commands;
-
-import com.alttd.altitudeapi.commands.ValidBaseCommand;
-import com.alttd.altitudetag.Permission;
-import com.alttd.altitudetag.commands.admin.TagAdminLocationCommand;
-
-public class TagAdminCommand extends ValidBaseCommand
-{
-    protected TagAdminCommand()
-    {
-        super("admin", "Management commands", Permission.COMMAND_ADMIN.getPermission(), new String[]{ "a" });
-
-        addSubCommand(new TagAdminLocationCommand());
-    }
-}

src/main/java/com/alttd/altitudetag/commands/TagCommand.java

@@ -1,32 +1,55 @@
 package com.alttd.altitudetag.commands;
 
-import com.alttd.altitudeapi.commands.ValidBaseCommand;
 import com.alttd.altitudetag.AltitudeTag;
+import com.alttd.altitudetag.Leaderboard;
 import com.alttd.altitudetag.configuration.Config;
 import com.alttd.altitudetag.configuration.Lang;
+import com.mojang.brigadier.Command;
+import com.mojang.brigadier.builder.LiteralArgumentBuilder;
+import com.mojang.brigadier.tree.LiteralCommandNode;
+import io.papermc.paper.command.brigadier.CommandSourceStack;
+import io.papermc.paper.command.brigadier.Commands;
 import org.bukkit.Bukkit;
-import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
+import org.jetbrains.annotations.NotNull;
 
-public class TagCommand extends ValidBaseCommand
+public class TagCommand
 {
-    public TagCommand()
-    {
-        super("tag", "Tag, you're it!", "tag.play", new String[]{ "tags", "tagging", "tagger" });
+    public @NotNull LiteralCommandNode<CommandSourceStack> command() {
+        final LiteralArgumentBuilder<CommandSourceStack> builder =
+                Commands.literal("tag")
+                        .requires(commandSourceStack ->
+                                commandSourceStack.getSender() instanceof Player player &&
+                                player.hasPermission("tag.play")
+                        )
+                        .then(Commands.literal("admin")
+                                .requires(commandSourceStack ->
+                                        commandSourceStack.getSender() instanceof Player player &&
+                                                player.hasPermission("tag.commands.admin")
+                                )
+                                .then(Commands.literal("location")
+                                        .requires(commandSourceStack ->
+                                                commandSourceStack.getSender() instanceof Player player &&
+                                                        player.hasPermission("tag.commands.admin.location")
+                                        )
+                                        .executes((source) -> {
+                                            if (!(source.getSource().getSender() instanceof Player player))
+                                                return Command.SINGLE_SUCCESS;
 
-        addSubCommand(new TagAdminCommand());
-    }
+                                            Leaderboard.setLocation(player.getLocation());
+                                            Lang.SET_LEADERBOARD_LOCATION.send(player);
 
-    @Override
-    public void help(CommandSender sender, String[] label)
-    {
-        if (sender.hasPermission(getSubCommand("admin").getPermission()))
-        {
-            sender.sendMessage(Lang.renderString(Config.NOTIFICATION_GLOBAL_BOSS_BAR_MESSAGE.getValue(),
-                                                 "{player}", Bukkit.getOfflinePlayer(AltitudeTag.getTagger()).getName()));
-        }
-        else
-        {
-            super.help(sender, label);
-        }
+                                            return Command.SINGLE_SUCCESS;
+                                        })
+                                )
+                        )
+                        .executes((source) -> {
+                            source.getSource().getSender()
+                                    .sendMessage(Lang.renderString(Config.NOTIFICATION_GLOBAL_BOSS_BAR_MESSAGE.getValue(),
+                                    "{player}", Bukkit.getOfflinePlayer(AltitudeTag.getTagger()).getName()));
+                            return Command.SINGLE_SUCCESS;
+                        })
+                ;
+        return builder.build();
     }
-}
+}

src/main/java/com/alttd/altitudetag/commands/admin/TagAdminLocationCommand.java

@@ -1,33 +0,0 @@
-package com.alttd.altitudetag.commands.admin;
-
-import java.util.List;
-
-import com.alttd.altitudeapi.commands.CommandArgument;
-import com.alttd.altitudeapi.commands.ValidCommand;
-import com.alttd.altitudetag.Leaderboard;
-import com.alttd.altitudetag.Permission;
-import com.alttd.altitudetag.configuration.Lang;
-import org.bukkit.command.CommandSender;
-import org.bukkit.entity.Player;
-
-public class TagAdminLocationCommand extends ValidCommand
-{
-    public TagAdminLocationCommand()
-    {
-        super("location",
-              "Sets the leaderboard location",
-              Permission.COMMAND_ADMIN_LOCATION.getPermission(),
-              true,
-              new String[]{ "loc", "setloc", "setlocation", "leaderboard", "board" });
-    }
-
-    @Override
-    public void validRun(CommandSender commandSender, String[] strings, List<CommandArgument<?>> list)
-    {
-        Player player = (Player) commandSender;
-
-        Leaderboard.setLocation(player.getLocation());
-
-        Lang.SET_LEADERBOARD_LOCATION.send(player);
-    }
-}

src/main/java/com/alttd/altitudetag/commands/parsers/StringParser.java

@@ -1,22 +0,0 @@
-package com.alttd.altitudetag.commands.parsers;
-
-import java.util.List;
-
-import com.alttd.altitudeapi.commands.CommandHandler;
-import com.alttd.altitudeapi.commands.Parser;
-import org.bukkit.command.CommandSender;
-
-public class StringParser implements Parser<String>
-{
-    @Override
-    public String parseArgument(CommandSender sender, String[] label, String rawArgument)
-    {
-        return rawArgument;
-    }
-
-    @Override
-    public List<String> getRecommendations(CommandSender sender, String lastWord)
-    {
-        return CommandHandler.defaultTabComplete(sender, lastWord);
-    }
-}

src/main/java/com/alttd/altitudetag/configuration/Config.java

@@ -2,8 +2,8 @@ package com.alttd.altitudetag.configuration;
 
 import java.util.Objects;
 
-import com.alttd.altitudeapi.utils.MutableValue;
 import com.alttd.altitudetag.AltitudeTag;
+import com.alttd.altitudetag.utils.MutableValue;
 import org.bukkit.ChatColor;
 import org.bukkit.configuration.file.FileConfiguration;
 

src/main/java/com/alttd/altitudetag/configuration/Lang.java

@@ -3,9 +3,9 @@ package com.alttd.altitudetag.configuration;
 import java.io.File;
 import java.util.Arrays;
 
-import com.alttd.altitudeapi.utils.CollectionUtils;
-import com.alttd.altitudeapi.utils.StringUtils;
 import com.alttd.altitudetag.AltitudeTag;
+import com.alttd.altitudetag.utils.CollectionUtils;
+import com.alttd.altitudetag.utils.StringUtils;
 import org.apache.commons.lang3.mutable.MutableBoolean;
 import org.bukkit.command.CommandSender;
 import org.bukkit.configuration.file.FileConfiguration;

src/main/java/com/alttd/altitudetag/listeners/InteractListener.java

@@ -17,19 +17,16 @@ public class InteractListener implements Listener
     @EventHandler
     public void onHit(EntityDamageByEntityEvent event)
     {
-        if (!(event.getDamager() instanceof Player) || !(event.getEntity() instanceof Player))
+        if (!(event.getDamager() instanceof Player tagger) || !(event.getEntity() instanceof Player tagged))
         {
             return;
         }
 
-        final Player tagger = (Player) event.getDamager();
         if (!AltitudeTag.getTagger().equals(tagger.getUniqueId()))
         {
             return;
         }
 
-        final Player tagged = (Player) event.getEntity();
-
 
         // check for time since last tag
         if (lastTagTime != -1 && Config.TAG_DELAY_ENABLED.getValue() && (System.currentTimeMillis() - lastTagTime) / 50 < Config.TAG_DELAY_DURATION.getValue())

src/main/java/com/alttd/altitudetag/utils/BarUtils.java

@@ -16,19 +16,13 @@ public class BarUtils
      */
     public static BarStyle parseBarStyle(int style)
     {
-        switch (style)
-        {
-            case 6:
-                return BarStyle.SEGMENTED_6;
-            case 10:
-                return BarStyle.SEGMENTED_10;
-            case 12:
-                return BarStyle.SEGMENTED_12;
-            case 20:
-                return BarStyle.SEGMENTED_20;
-            default:
-                return BarStyle.SOLID;
-        }
+        return switch (style) {
+            case 6 -> BarStyle.SEGMENTED_6;
+            case 10 -> BarStyle.SEGMENTED_10;
+            case 12 -> BarStyle.SEGMENTED_12;
+            case 20 -> BarStyle.SEGMENTED_20;
+            default -> BarStyle.SOLID;
+        };
     }
 
     /**

src/main/java/com/alttd/altitudetag/utils/CollectionUtils.java

@@ -0,0 +1,250 @@
+package com.alttd.altitudetag.utils;
+
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.Deque;
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Map;
+import java.util.Random;
+
+public class CollectionUtils
+{
+
+    private final static Map<Class<?>, Method> nameMethods = new HashMap<>();
+
+    /**
+     * Retrieves the last value of the given list. If the list is null or it has no elements, this will always return
+     * null. If the List is also a Deque, this will return the last element using {@link Deque#peekLast()}.
+     *
+     * @param list the list to get the last value of.
+     * @param <T>  the type of the list.
+     *
+     * @return the last value.
+     */
+    @SuppressWarnings("unchecked")
+    public static <T> T getLast(List<T> list)
+    {
+        if (list == null || list.size() == 0)
+        {
+            return null;
+        }
+        if (list instanceof Deque)
+        {
+            return ((Deque<T>) list).peekLast();
+        }
+        return list.get(list.size() - 1);
+    }
+
+    /**
+     * Safely checks if the given collection is immutable. If the collection is mutable, the data will not be affected
+     * unless the collection in question keeps track of total number of operations. The test is done by calling
+     * {@link Collection#removeIf(java.util.function.Predicate)} with the predicate of {@code false}.
+     *
+     * @param values the collection to check.
+     *
+     * @return {@code true} if the collection is immutable.
+     */
+    public static boolean isImmutable(Collection<?> values)
+    {
+        try
+        {
+            values.removeIf(x -> false);
+            return true;
+        }
+        catch (UnsupportedOperationException ex)
+        {
+            return false;
+        }
+    }
+
+    /**
+     * Converts the given values into their string counterpart. This is done by calling {@link Object#toString()} on
+     * every object. More specific use cases like {@link org.bukkit.entity.Player#getName()} etc are not compatible.
+     *
+     * @param values the values to convert.
+     * @param <T>    the type of the collection.
+     *
+     * @return the generated list of Strings.
+     */
+    public static <T> List<String> getStringList(Collection<T> values)
+    {
+        if (values == null || values.size() == 0)
+        {
+            return Collections.emptyList();
+        }
+        List<String> list = new LinkedList<>();
+        for (Object o : values)
+        {
+            if (o != null)
+            {
+                list.add(o.toString());
+            }
+            else
+            {
+                list.add(null);
+            }
+        }
+        return list;
+    }
+
+    /**
+     * Get the names of every single object passed in the values parameter. This method requires the method "getName()"
+     * to exist within whatever type is passed. If it does not exist, an empty list is returned. However, in the future
+     * there is a potential that it will be changed to throwing an {@link IllegalArgumentException}.
+     *
+     * @param values the values to get the name of.
+     * @param type   the type of the object.
+     * @param <T>    the type of the list.
+     *
+     * @return the list of names.
+     */
+    public static <T> List<String> getNames(Collection<T> values, Class<T> type)
+    {
+        if (values == null || values.size() == 0)
+        {
+            return Collections.emptyList();
+        }
+        List<String> list = new LinkedList<>();
+
+        Method method = getNameMethod(type);
+
+        if (method == null)
+        {
+            return Collections.emptyList();
+        }
+
+        for (Object obj : values)
+        {
+            try
+            {
+                list.add((String) method.invoke(obj));
+            }
+            catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException ex)
+            {
+                // this exception is actually going to be printed as it should never happen.
+                // the method was set to accessible previously, and it should also never have any arguments.
+                ex.printStackTrace();
+            }
+        }
+        return list;
+    }
+
+    private static Method getNameMethod(Class<?> clazz)
+    {
+        Method method = nameMethods.get(clazz);
+        if (method == null)
+        {
+            try
+            {
+                method = clazz.getDeclaredMethod("getName");
+                method.setAccessible(true);
+                nameMethods.put(clazz, method);
+            }
+            catch (NoSuchMethodException | SecurityException ex)
+            {
+                // ignored
+            }
+        }
+        return method;
+    }
+
+    /**
+     * Searches through the given values for the first non-null value.
+     *
+     * @param values the values to find.
+     * @param <T>    the type of the array.
+     *
+     * @return the first non-null value.
+     */
+    @SafeVarargs
+    public static <T> T firstNonNull(T... values)
+    {
+        for (T value : values)
+        {
+            if (value != null)
+            {
+                return value;
+            }
+        }
+        return null;
+    }
+
+    /**
+     * Converts the given String collection into a String array.
+     *
+     * @param collection the collection to convert.
+     *
+     * @return the newly created array.
+     */
+    public static String[] toArray(Collection<String> collection)
+    {
+        return collection.toArray(new String[0]);
+    }
+
+    /**
+     * Returns a random value from the collection. If the collection is null or empty, this will return null.
+     *
+     * @param collection the collection to poll.
+     * @param <T>        the type of the collection.
+     *
+     * @return a random value from the collection.
+     */
+    public static <T> T randomValue(Collection<T> collection)
+    {
+        return randomValue(collection, (T) null);
+    }
+
+    /**
+     * Returns a random value from the collection. If the collection is null or empty, this will return null.
+     *
+     * @param collection the collection to poll.
+     * @param ignored    any values not suitable to be included
+     * @param <T>        the type of the collection.
+     *
+     * @return a random value from the collection.
+     */
+    @SafeVarargs
+    public static <T> T randomValue(Collection<T> collection, T... ignored)
+    {
+        // if it's null or empty, we don't care
+        if (collection == null || collection.size() == 0)
+        {
+            return null;
+        }
+        // if the ignored values aren't null, we need to make them not an option
+        if (ignored != null)
+        {
+            collection = new ArrayList<>(collection);
+            collection.removeAll(Arrays.asList(ignored));
+        }
+        Random random = new Random();
+
+        // the index to get a value from
+        int index = random.nextInt(collection.size());
+
+        // if it's a list, we can just get it at that index, no need to iterate
+        if (collection instanceof List)
+        {
+            return ((List<T>) collection).get(index);
+        }
+
+        // it's not a list, time to iterate
+        Iterator<? extends T> iterator = collection.iterator();
+        for (int i = 0; iterator.hasNext(); i++)
+        {
+            if (i == index)
+            {
+                return iterator.next();
+            }
+            iterator.next();
+        }
+        return null;
+    }
+}

src/main/java/com/alttd/altitudetag/utils/MutableValue.java

@@ -0,0 +1,60 @@
+package com.alttd.altitudetag.utils;
+
+/**
+ * Represents a mutable data type for a type that may not normally be mutable, either because it is final, primitive, or sealed.
+ *
+ * @param <T> the type of this mutable value.
+ */
+public class MutableValue<T>
+{
+    private T value;
+
+    /**
+     * Constructs a new MutableValue with the given object.
+     *
+     * @param t the value to be stored.
+     */
+    public MutableValue(T t)
+    {
+        if (t == null)
+        {
+            throw new IllegalArgumentException("Value can't be null.");
+        }
+
+        this.value = t;
+    }
+
+    /**
+     * Returns the value that is currently stored. If there is no value, returns null.
+     *
+     * @return the value that is currently stored.
+     */
+    public T getValue()
+    {
+        return value;
+    }
+
+    /**
+     * Sets the value that is currently stored.
+     *
+     * @param t the new value to be stored.
+     */
+    public void setValue(T t)
+    {
+        if (t == null)
+        {
+            throw new IllegalArgumentException("Value can't be null.");
+        }
+        this.value = t;
+    }
+
+    public Class<T> getType()
+    {
+        if (value == null)
+        {
+            throw new IllegalStateException("Value can't be null.");
+        }
+
+        return (Class<T>) value.getClass();
+    }
+}

src/main/java/com/alttd/altitudetag/utils/StringUtils.java

@@ -0,0 +1,154 @@
+package com.alttd.altitudetag.utils;
+
+import java.text.DecimalFormat;
+
+public class StringUtils
+{
+
+    public static String implode(String[] strings, int start, int end)
+    {
+        StringBuilder sb = new StringBuilder();
+
+        for (int i = start; i < end; i++)
+        {
+            sb.append(strings[i]).append(" ");
+        }
+
+        return sb.toString().trim();
+    }
+
+    public static String[] add(String[] array, String add)
+    {
+        String[] values = new String[array.length + 1];
+        System.arraycopy(array, 0, values, 0, array.length);
+        values[array.length] = add;
+        return values;
+    }
+
+    public static String compile(String[] strings)
+    {
+        return implode(strings, 0, strings.length);
+    }
+
+    public static String capitalize(final String str)
+    {
+        int strLen;
+        if (str == null || (strLen = str.length()) == 0)
+        {
+            return str;
+        }
+
+        final int firstCodepoint = str.codePointAt(0);
+        final int newCodePoint = Character.toTitleCase(firstCodepoint);
+        if (firstCodepoint == newCodePoint)
+        {
+            // already capitalized
+            return str;
+        }
+
+        final int[] newCodePoints = new int[strLen]; // cannot be longer than
+        // the char array
+        int outOffset = 0;
+        newCodePoints[outOffset++] = newCodePoint; // copy the first codepoint
+        for (int inOffset = Character.charCount(firstCodepoint); inOffset < strLen; )
+        {
+            final int codepoint = str.codePointAt(inOffset);
+            newCodePoints[outOffset++] = codepoint; // copy the remaining ones
+            inOffset += Character.charCount(codepoint);
+        }
+        return new String(newCodePoints, 0, outOffset);
+    }
+
+    public static boolean contains(String[] values, String search)
+    {
+        for (String val : values)
+        {
+            if (val.equalsIgnoreCase(search))
+            {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    public static boolean isNullOrEmpty(String str)
+    {
+        return str == null || str.length() == 0;
+    }
+
+    public static boolean isWhitespace(String str)
+    {
+        if (str == null)
+        {
+            return false;
+        }
+        final int sz = str.length();
+        for (int i = 0; i < sz; i++)
+        {
+            if (!Character.isWhitespace(str.charAt(i)))
+            {
+                return false;
+            }
+        }
+        return true;
+    }
+
+    public static boolean containsAny(String search, String... strings)
+    {
+        if (isNullOrEmpty(search))
+        {
+            return false;
+        }
+        for (String searchCharSequence : strings)
+        {
+            if (indexOf(search, searchCharSequence, 0) >= 0)
+            {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    private static int indexOf(CharSequence cs, CharSequence searchChar, int start)
+    {
+        return cs.toString().indexOf(searchChar.toString(), start);
+    }
+
+    public static String formatNumber(Number number, int decimalPlaces, boolean useCommas)
+    {
+        StringBuilder sb = new StringBuilder();
+        if (useCommas)
+        {
+            sb.append("#,##0");
+        }
+        else
+        {
+            sb.append("0");
+        }
+        if (decimalPlaces > 0)
+        {
+            sb.append('.');
+            for (int i = 0; i < decimalPlaces; i++)
+            {
+                sb.append('0');
+            }
+        }
+        return new DecimalFormat(sb.toString()).format(number);
+    }
+
+    public static String doubleFormat(double number)
+    {
+        String formatted;
+
+        if (number % 1 == 0)
+        {
+            formatted = Integer.toString((int) number);
+        }
+        else
+        {
+            formatted = Double.toString(number);
+        }
+        return formatted;
+    }
+
+}