add foundation work

src/main/java/dev/plex/medina/Medina.java

@@ -0,0 +1,41 @@
+package dev.plex.medina;
+
+import dev.plex.medina.config.Config;
+import dev.plex.medina.registration.CommandRegistration;
+import org.bstats.bukkit.Metrics;
+import org.bukkit.plugin.java.JavaPlugin;
+
+
+public class Medina extends JavaPlugin
+{
+    private static Medina plugin;
+
+    public Config config;
+    public Config messages;
+
+    @Override
+    public void onLoad()
+    {
+        plugin = this;
+        config = new Config(this, "config.yml");
+        messages = new Config(this, "messages.yml");
+    }
+
+    @Override
+    public void onEnable()
+    {
+        config.load();
+        messages.load();
+
+        // Metrics @ https://bstats.org/plugin/bukkit/Medina/22026
+        Metrics metrics = new Metrics(this, 22026);
+
+        new CommandRegistration();
+    }
+
+    public static Medina getPlugin()
+    {
+        return plugin;
+    }
+
+}

src/main/java/dev/plex/medina/MedinaBase.java

@@ -0,0 +1,6 @@
+package dev.plex.medina;
+
+public interface MedinaBase
+{
+    Medina plugin = Medina.getPlugin();
+}

src/main/java/dev/plex/medina/command/MedinaCommand.java

@@ -0,0 +1,311 @@
+package dev.plex.medina.command;
+
+import java.util.Arrays;
+import java.util.List;
+
+import com.google.common.collect.Lists;
+import dev.plex.medina.Medina;
+import dev.plex.medina.command.annotation.CommandParameters;
+import dev.plex.medina.command.source.RequiredCommandSource;
+import dev.plex.medina.util.MedinaUtils;
+import net.kyori.adventure.audience.Audience;
+import net.kyori.adventure.text.Component;
+import net.kyori.adventure.text.format.NamedTextColor;
+import net.kyori.adventure.text.serializer.legacy.LegacyComponentSerializer;
+import org.bukkit.Bukkit;
+import org.bukkit.command.*;
+import org.bukkit.entity.Player;
+import org.bukkit.util.StringUtil;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+@SuppressWarnings("all")
+public abstract class MedinaCommand extends Command implements PluginIdentifiableCommand
+{
+    /**
+     * Returns the instance of the plugin
+     */
+    protected static Medina plugin = Medina.getPlugin();
+
+    /**
+     * The parameters for the command
+     */
+    private final CommandParameters params;
+
+    /**
+     * Required command source fetched from the parameters
+     */
+    private final RequiredCommandSource commandSource;
+
+    public MedinaCommand(boolean register)
+    {
+        super("");
+        this.params = getClass().getAnnotation(CommandParameters.class);
+
+        setName(this.params.name());
+        setLabel(this.params.name());
+        setDescription(this.params.description());
+        setDescription(this.params.permission());
+        setUsage(params.usage().replace("<command>", this.params.name()));
+        if (params.aliases().split(",").length > 0)
+        {
+            setAliases(Arrays.asList(params.aliases().split(",")));
+        }
+        this.commandSource = this.params.source();
+
+        if (register)
+        {
+            if (getMap().getKnownCommands().containsKey(this.getName().toLowerCase()))
+            {
+                getMap().getKnownCommands().remove(this.getName().toLowerCase());
+            }
+            this.getAliases().forEach(s ->
+            {
+                if (getMap().getKnownCommands().containsKey(s.toLowerCase()))
+                {
+                    getMap().getKnownCommands().remove(s.toLowerCase());
+                }
+            });
+            getMap().register("medina", this);
+        }
+    }
+
+    public MedinaCommand()
+    {
+        this(true);
+    }
+
+    /**
+     * The plugin
+     *
+     * @return The instance of the plugin
+     * @see Medina
+     */
+    @Override
+    public @NotNull Medina getPlugin()
+    {
+        return plugin;
+    }
+
+    /**
+     * Executes the command
+     *
+     * @param sender       The sender of the command
+     * @param playerSender The player who executed the command (null if CommandSource is console or if CommandSource is any but console executed)
+     * @param args         A Kyori Component to send to the sender (can be null)
+     */
+    protected abstract Component execute(@NotNull CommandSender sender, @Nullable Player playerSender, @NotNull String[] args);
+
+    /**
+     * @hidden
+     */
+    @Override
+    public boolean execute(@NotNull CommandSender sender, @NotNull String label, String[] args)
+    {
+        if (!matches(label))
+        {
+            return false;
+        }
+
+        if (commandSource == RequiredCommandSource.CONSOLE && sender instanceof Player)
+        {
+            sender.sendMessage(messageComponent("noPermissionInGame"));
+            return true;
+        }
+
+        if (commandSource == RequiredCommandSource.IN_GAME)
+        {
+            if (sender instanceof ConsoleCommandSender)
+            {
+                send(sender, messageComponent("noPermissionConsole"));
+                return true;
+            }
+        }
+
+        if (sender instanceof Player player)
+        {
+
+            if (!params.permission().isEmpty() && !player.hasPermission(params.permission()))
+            {
+                send(sender, messageComponent("noPermissionNode", params.permission()));
+                return true;
+            }
+        }
+
+        if (sender instanceof ConsoleCommandSender && !sender.getName().equalsIgnoreCase("console")) //telnet
+        {
+            if (!params.permission().isEmpty() && !Bukkit.getPlayer(sender.getName()).hasPermission(params.permission()))
+            {
+                send(sender, messageComponent("noPermissionNode", params.permission()));
+                return true;
+            }
+        }
+        try
+        {
+            Component component = this.execute(sender, isConsole(sender) ? null : (Player) sender, args);
+            if (component != null)
+            {
+                send(sender, component);
+            }
+        }
+        catch (NumberFormatException ex)
+        {
+            send(sender, MedinaUtils.mmDeserialize(ex.getMessage()));
+        }
+        return true;
+    }
+
+    /**
+     * Sends a message to an Audience
+     *
+     * @param audience The Audience to send the message to
+     * @param s        The message to send
+     */
+    protected void send(Audience audience, String s)
+    {
+        audience.sendMessage(componentFromString(s));
+    }
+
+    /**
+     * Sends a message to an Audience
+     *
+     * @param audience  The Audience to send the message to
+     * @param component The Component to send
+     */
+    protected void send(Audience audience, Component component)
+    {
+        audience.sendMessage(component);
+    }
+
+    @NotNull
+    public abstract List<String> smartTabComplete(@NotNull CommandSender sender, @NotNull String alias, @NotNull String[] args) throws IllegalArgumentException;
+
+    @NotNull
+    @Override
+    public List<String> tabComplete(@NotNull CommandSender sender, @NotNull String alias, @NotNull String[] args) throws IllegalArgumentException
+    {
+        List<String> list = smartTabComplete(sender, alias, args);
+        return StringUtil.copyPartialMatches(args[args.length - 1], list, Lists.newArrayList());
+    }
+
+    /**
+     * Checks if the String given is a matching command
+     *
+     * @param label The String to check
+     * @return true if the string is a command name or alias
+     */
+    private boolean matches(String label)
+    {
+        if (params.aliases().split(",").length > 0)
+        {
+            for (String alias : params.aliases().split(","))
+            {
+                if (alias.equalsIgnoreCase(label) || getName().equalsIgnoreCase(label))
+                {
+                    return true;
+                }
+            }
+        }
+        else if (params.aliases().split(",").length < 1)
+        {
+            return getName().equalsIgnoreCase(label);
+        }
+        return false;
+    }
+
+    /**
+     * Checks whether a sender is console
+     *
+     * @param sender A command sender
+     * @return true if the sender is console
+     */
+    protected boolean isConsole(CommandSender sender)
+    {
+        return !(sender instanceof Player);
+    }
+
+    /**
+     * Converts a message entry from the "messages.yml" to a Component
+     *
+     * @param s       The message entry
+     * @param objects Any objects to replace in order
+     * @return A Kyori Component
+     */
+    protected Component messageComponent(String s, Object... objects)
+    {
+        return MedinaUtils.messageComponent(s, objects);
+    }
+
+    /**
+     * Converts a message entry from the "messages.yml" to a Component
+     *
+     * @param s       The message entry
+     * @param objects Any objects to replace in order
+     * @return A Kyori Component
+     */
+    protected Component messageComponent(String s, Component... objects)
+    {
+        return MedinaUtils.messageComponent(s, objects);
+    }
+
+    /**
+     * Converts a message entry from the "messages.yml" to a String
+     *
+     * @param s       The message entry
+     * @param objects Any objects to replace in order
+     * @return A String
+     */
+    protected String messageString(String s, Object... objects)
+    {
+        return MedinaUtils.messageString(s, objects);
+    }
+
+    /**
+     * Converts a String to a legacy Kyori Component
+     *
+     * @param s The String to convert
+     * @return A Kyori component
+     */
+    protected Component componentFromString(String s)
+    {
+        return LegacyComponentSerializer.legacyAmpersand().deserialize(s).colorIfAbsent(NamedTextColor.GRAY);
+    }
+
+    /**
+     * Converts usage to a Component
+     *
+     * @return A Kyori Component stating the usage
+     */
+    protected Component usage()
+    {
+        return Component.text("Correct Usage: ").color(NamedTextColor.YELLOW).append(componentFromString(this.getUsage()).color(NamedTextColor.GRAY));
+    }
+
+    /**
+     * Converts usage to a Component
+     * <p>
+     * s The usage to convert
+     *
+     * @return A Kyori Component stating the usage
+     */
+    protected Component usage(String s)
+    {
+        return Component.text("Correct Usage: ").color(NamedTextColor.YELLOW).append(componentFromString(s).color(NamedTextColor.GRAY));
+    }
+
+    /**
+     * Converts a String to a MiniMessage Component
+     *
+     * @param s The String to convert
+     * @return A Kyori Component
+     */
+    protected Component mmString(String s)
+    {
+        return MedinaUtils.mmDeserialize(s);
+    }
+
+    public CommandMap getMap()
+    {
+        return Medina.getPlugin().getServer().getCommandMap();
+    }
+}

src/main/java/dev/plex/medina/command/annotation/CommandParameters.java

@@ -0,0 +1,56 @@
+package dev.plex.medina.command.annotation;
+
+import dev.plex.medina.command.source.RequiredCommandSource;
+
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+
+/**
+ * Storage for a command's parameters
+ */
+@Retention(RetentionPolicy.RUNTIME)
+public @interface CommandParameters
+{
+    /**
+     * The name
+     *
+     * @return Name of the command
+     */
+    String name();
+
+    /**
+     * The description
+     *
+     * @return Description of the command
+     */
+    String description() default "";
+
+    /**
+     * The usage (optional)
+     *
+     * @return The usage of the command
+     */
+    String usage() default "/<command>";
+
+    /**
+     * The aliases (optional)
+     *
+     * @return The aliases of the command
+     */
+    String aliases() default "";
+
+    /**
+     * Required command source
+     *
+     * @return The required command source of the command
+     * @see RequiredCommandSource
+     */
+    RequiredCommandSource source() default RequiredCommandSource.ANY;
+
+    /**
+     * The permission
+     *
+     * @return Permission of the command
+     */
+    String permission() default "";
+}

src/main/java/dev/plex/medina/command/impl/AnyCommand.java

@@ -0,0 +1,28 @@
+package dev.plex.medina.command.impl;
+
+import dev.plex.medina.command.MedinaCommand;
+import dev.plex.medina.command.annotation.CommandParameters;
+import dev.plex.medina.command.source.RequiredCommandSource;
+import net.kyori.adventure.text.Component;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.List;
+
+@CommandParameters(name = "anycommand", usage = "/<command>", description = "Tests the command system with a command", permission = "medina.anycommand", source = RequiredCommandSource.ANY)
+public class AnyCommand extends MedinaCommand
+{
+    @Override
+    protected Component execute(@NotNull CommandSender sender, @Nullable Player playerSender, @NotNull String[] args)
+    {
+        return mmString("<green>AnyCommand registered.");
+    }
+
+    @Override
+    public @NotNull List<String> smartTabComplete(@NotNull CommandSender sender, @NotNull String alias, @NotNull String[] args) throws IllegalArgumentException
+    {
+        return List.of();
+    }
+}

src/main/java/dev/plex/medina/command/impl/ConsoleOnlyCommand.java

@@ -0,0 +1,28 @@
+package dev.plex.medina.command.impl;
+
+import dev.plex.medina.command.MedinaCommand;
+import dev.plex.medina.command.annotation.CommandParameters;
+import dev.plex.medina.command.source.RequiredCommandSource;
+import net.kyori.adventure.text.Component;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.List;
+
+@CommandParameters(name = "consoleonly", usage = "/<command>", description = "Tests the command system with a console only command", permission = "medina.consoleonly", source = RequiredCommandSource.CONSOLE)
+public class ConsoleOnlyCommand extends MedinaCommand
+{
+    @Override
+    protected Component execute(@NotNull CommandSender sender, @Nullable Player playerSender, @NotNull String[] args)
+    {
+        return mmString("<green>ConsoleOnlyCommand registered.");
+    }
+
+    @Override
+    public @NotNull List<String> smartTabComplete(@NotNull CommandSender sender, @NotNull String alias, @NotNull String[] args) throws IllegalArgumentException
+    {
+        return List.of();
+    }
+}

src/main/java/dev/plex/medina/command/impl/ReportCommand.java

@@ -0,0 +1,28 @@
+package dev.plex.medina.command.impl;
+
+import dev.plex.medina.command.MedinaCommand;
+import dev.plex.medina.command.annotation.CommandParameters;
+import dev.plex.medina.command.source.RequiredCommandSource;
+import net.kyori.adventure.text.Component;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.List;
+
+@CommandParameters(name = "report", usage = "/<command> <player> <message>", description = "Reports a player", permission = "medina.report", source = RequiredCommandSource.IN_GAME)
+public class ReportCommand extends MedinaCommand
+{
+    @Override
+    protected Component execute(@NotNull CommandSender sender, @Nullable Player playerSender, @NotNull String[] args)
+    {
+        return mmString("<green>Report command registered.");
+    }
+
+    @Override
+    public @NotNull List<String> smartTabComplete(@NotNull CommandSender sender, @NotNull String alias, @NotNull String[] args) throws IllegalArgumentException
+    {
+        return List.of();
+    }
+}

src/main/java/dev/plex/medina/command/source/RequiredCommandSource.java

@@ -0,0 +1,8 @@
+package dev.plex.medina.command.source;
+
+public enum RequiredCommandSource
+{
+    IN_GAME,
+    CONSOLE,
+    ANY
+}

src/main/java/dev/plex/medina/config/Config.java

@@ -0,0 +1,120 @@
+package dev.plex.medina.config;
+
+import dev.plex.medina.Medina;
+import dev.plex.medina.util.MedinaLog;
+import org.bukkit.configuration.file.YamlConfiguration;
+
+import java.io.File;
+import java.io.InputStreamReader;
+import java.nio.charset.StandardCharsets;
+
+public class Config extends YamlConfiguration
+{
+    /**
+     * The plugin instance
+     */
+    private Medina plugin;
+
+    /**
+     * The File instance
+     */
+    private File file;
+
+    /**
+     * The file name
+     */
+    private String name;
+
+    /**
+     * Whether new entries were added to the file automatically
+     */
+    private boolean added = false;
+
+    /**
+     * Creates a config object
+     *
+     * @param plugin The plugin instance
+     * @param name   The file name
+     */
+    public Config(Medina plugin, String name)
+    {
+        this.plugin = plugin;
+        this.file = new File(plugin.getDataFolder(), name);
+        this.name = name;
+
+        if (!file.exists())
+        {
+            saveDefault();
+        }
+    }
+
+    public void load()
+    {
+        this.load(true);
+    }
+
+    /**
+     * Loads the configuration file
+     */
+    public void load(boolean loadFromFile)
+    {
+        try
+        {
+            if (loadFromFile)
+            {
+                YamlConfiguration externalYamlConfig = YamlConfiguration.loadConfiguration(file);
+                InputStreamReader internalConfigFileStream = new InputStreamReader(plugin.getResource(name), StandardCharsets.UTF_8);
+                YamlConfiguration internalYamlConfig = YamlConfiguration.loadConfiguration(internalConfigFileStream);
+
+                // Gets all the keys inside the internal file and iterates through all of it's key pairs
+                for (String string : internalYamlConfig.getKeys(true))
+                {
+                    // Checks if the external file contains the key already.
+                    if (!externalYamlConfig.contains(string))
+                    {
+                        // If it doesn't contain the key, we set the key based off what was found inside the plugin jar
+                        externalYamlConfig.setComments(string, internalYamlConfig.getComments(string));
+                        externalYamlConfig.setInlineComments(string, internalYamlConfig.getInlineComments(string));
+                        externalYamlConfig.set(string, internalYamlConfig.get(string));
+                        MedinaLog.log("Setting key: " + string + " in " + this.name + " to the default value(s) since it does not exist!");
+                        added = true;
+                    }
+                }
+                if (added)
+                {
+                    externalYamlConfig.save(file);
+                    MedinaLog.log("Saving new file...");
+                    added = false;
+                }
+            }
+            super.load(file);
+        }
+        catch (Exception ex)
+        {
+            ex.printStackTrace();
+        }
+    }
+
+    /**
+     * Saves the configuration file
+     */
+    public void save()
+    {
+        try
+        {
+            super.save(file);
+        }
+        catch (Exception ex)
+        {
+            ex.printStackTrace();
+        }
+    }
+
+    /**
+     * Moves the configuration file from the plugin's resources folder to the data folder (plugins/Medina/)
+     */
+    private void saveDefault()
+    {
+        plugin.saveResource(name, false);
+    }
+}

src/main/java/dev/plex/medina/registration/CommandRegistration.java

@@ -0,0 +1,35 @@
+package dev.plex.medina.registration;
+
+import com.google.common.collect.Lists;
+import dev.plex.medina.MedinaBase;
+import dev.plex.medina.command.MedinaCommand;
+import dev.plex.medina.util.MedinaLog;
+import dev.plex.medina.util.ReflectionsUtil;
+
+import java.lang.reflect.InvocationTargetException;
+import java.util.List;
+import java.util.Set;
+
+public class CommandRegistration implements MedinaBase
+{
+    public CommandRegistration()
+    {
+        Set<Class<? extends MedinaCommand>> commandSet = ReflectionsUtil.getClassesBySubType("dev.plex.medina.command.impl", MedinaCommand.class);
+        List<MedinaCommand> commands = Lists.newArrayList();
+
+        commandSet.forEach(clazz ->
+        {
+            try
+            {
+
+                commands.add(clazz.getConstructor().newInstance());
+            }
+            catch (InvocationTargetException | InstantiationException | IllegalAccessException |
+                   NoSuchMethodException ex)
+            {
+                MedinaLog.error("Failed to register " + clazz.getSimpleName() + " as a command!");
+            }
+        });
+        MedinaLog.log(String.format("Registered %s commands from %s classes!", commands.size(), commandSet.size()));
+    }
+}

src/main/java/dev/plex/medina/util/MedinaLog.java

@@ -0,0 +1,71 @@
+package dev.plex.medina.util;
+
+import dev.plex.medina.Medina;
+import net.kyori.adventure.text.Component;
+import net.kyori.adventure.text.format.NamedTextColor;
+import net.kyori.adventure.text.logger.slf4j.ComponentLogger;
+
+public class MedinaLog
+{
+    private static final ComponentLogger logger = ComponentLogger.logger("");
+
+    public static void log(String message, Object... strings)
+    {
+        for (int i = 0; i < strings.length; i++)
+        {
+            if (strings[i] == null) continue;
+            if (message.contains("{" + i + "}"))
+            {
+                message = message.replace("{" + i + "}", strings[i].toString());
+            }
+        }
+        logger.info(MedinaUtils.mmDeserialize("<yellow>[Medina] <gray>" + message));
+    }
+
+    public static void log(Component component)
+    {
+        logger.info(Component.text("[Medina] ").color(NamedTextColor.YELLOW).append(component).colorIfAbsent(NamedTextColor.GRAY));
+    }
+
+    public static void error(String message, Object... strings)
+    {
+        for (int i = 0; i < strings.length; i++)
+        {
+            if (strings[i] == null) continue;
+            if (message.contains("{" + i + "}"))
+            {
+                message = message.replace("{" + i + "}", strings[i].toString());
+            }
+        }
+        logger.error(MedinaUtils.mmDeserialize("<red>[Medina Error] <gold>" + message));
+    }
+
+    public static void warn(String message, Object... strings)
+    {
+        for (int i = 0; i < strings.length; i++)
+        {
+            if (strings[i] == null) continue;
+            if (message.contains("{" + i + "}"))
+            {
+                message = message.replace("{" + i + "}", strings[i].toString());
+            }
+        }
+        logger.warn(MedinaUtils.mmDeserialize("<#eb7c0e>[Medina Warning] <gold>" + message));
+    }
+
+    public static void debug(String message, Object... strings)
+    {
+        if (Medina.getPlugin().config.getBoolean("debug"))
+        {
+            for (int i = 0; i < strings.length; i++)
+            {
+                if (strings[i] == null) continue;
+                if (message.contains("{" + i + "}"))
+                {
+                    message = message.replace("{" + i + "}", strings[i].toString());
+                }
+            }
+            logger.info(MedinaUtils.mmDeserialize("<dark_purple>[Medina Debug] <gold>" + message));
+        }
+    }
+}

src/main/java/dev/plex/medina/util/MedinaUtils.java

@@ -0,0 +1,57 @@
+package dev.plex.medina.util;
+
+import dev.plex.medina.MedinaBase;
+import net.kyori.adventure.text.Component;
+import net.kyori.adventure.text.minimessage.MiniMessage;
+import net.kyori.adventure.text.minimessage.tag.resolver.TagResolver;
+import net.kyori.adventure.text.serializer.plain.PlainTextComponentSerializer;
+
+public class MedinaUtils implements MedinaBase
+{
+    private static final MiniMessage MINI_MESSAGE = MiniMessage.miniMessage();
+
+    public static Component mmDeserialize(String input)
+    {
+        return MINI_MESSAGE.deserialize(input);
+    }
+
+    public static String mmSerialize(Component input)
+    {
+        return MINI_MESSAGE.serialize(input);
+    }
+
+    public static Component mmCustomDeserialize(String input, TagResolver... resolvers)
+    {
+        return MiniMessage.builder().tags(TagResolver.builder().resolvers(resolvers).build()).build().deserialize(input);
+    }
+
+    public static Component messageComponent(String entry, Object... objects)
+    {
+        return MINI_MESSAGE.deserialize(messageString(entry, objects));
+    }
+
+    public static Component messageComponent(String entry, Component... objects)
+    {
+        Component component = MINI_MESSAGE.deserialize(messageString(entry));
+        for (int i = 0; i < objects.length; i++)
+        {
+            int finalI = i;
+            component = component.replaceText(builder -> builder.matchLiteral("{" + finalI + "}").replacement(objects[finalI]).build());
+        }
+        return component;
+    }
+
+    public static String messageString(String entry, Object... objects)
+    {
+        String f = plugin.messages.getString(entry);
+        if (f == null)
+        {
+            throw new NullPointerException();
+        }
+        for (int i = 0; i < objects.length; i++)
+        {
+            f = f.replace("{" + i + "}", String.valueOf(objects[i]));
+        }
+        return f;
+    }
+}

src/main/java/dev/plex/medina/util/ReflectionsUtil.java

@@ -0,0 +1,71 @@
+package dev.plex.medina.util;
+
+import com.google.common.collect.ImmutableSet;
+import com.google.common.reflect.ClassPath;
+import com.google.common.reflect.TypeToken;
+import dev.plex.medina.Medina;
+
+import java.io.IOException;
+import java.lang.reflect.Field;
+import java.lang.reflect.ParameterizedType;
+import java.lang.reflect.Type;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.Set;
+
+public class ReflectionsUtil
+{
+    public static Set<Class<?>> getClassesFrom(String packageName)
+    {
+        Set<Class<?>> classes = new HashSet<>();
+        try
+        {
+            ClassPath path = ClassPath.from(Medina.class.getClassLoader());
+            ImmutableSet<ClassPath.ClassInfo> infoSet = path.getTopLevelClasses(packageName);
+            infoSet.forEach(info ->
+            {
+                try
+                {
+                    Class<?> clazz = Class.forName(info.getName());
+                    classes.add(clazz);
+                }
+                catch (ClassNotFoundException ex)
+                {
+                    MedinaLog.error("Unable to find class " + info.getName() + " in " + packageName);
+                }
+            });
+        }
+        catch (IOException ex)
+        {
+            MedinaLog.error("Something went wrong while fetching classes from " + packageName);
+            throw new RuntimeException(ex);
+        }
+        return Collections.unmodifiableSet(classes);
+    }
+
+    @SuppressWarnings("unchecked")
+    public static <T> Set<Class<? extends T>> getClassesBySubType(String packageName, Class<T> subType)
+    {
+        Set<Class<?>> loadedClasses = getClassesFrom(packageName);
+        Set<Class<? extends T>> classes = new HashSet<>();
+        loadedClasses.forEach(clazz ->
+        {
+            if (clazz.getSuperclass() == subType || Arrays.asList(clazz.getInterfaces()).contains(subType))
+            {
+                classes.add((Class<? extends T>) clazz);
+            }
+        });
+        return Collections.unmodifiableSet(classes);
+    }
+
+    public static Class<?> getGenericField(Field field)
+    {
+        Type type = field.getGenericType();
+        if (type instanceof ParameterizedType parameterizedType)
+        {
+            return TypeToken.of(parameterizedType.getActualTypeArguments()[0]).getRawType();
+        }
+        return field.getType();
+    }
+}