!Exp curve refactor

src/main/java/net/Indyuce/mmocore/MMOCore.java

@@ -70,6 +70,7 @@ import net.Indyuce.mmocore.manager.ConfigManager;
 import net.Indyuce.mmocore.manager.CustomBlockManager;
 import net.Indyuce.mmocore.manager.DropTableManager;
 import net.Indyuce.mmocore.manager.EntityManager;
+import net.Indyuce.mmocore.manager.ExperienceManager;
 import net.Indyuce.mmocore.manager.InventoryManager;
 import net.Indyuce.mmocore.manager.LootableChestManager;
 import net.Indyuce.mmocore.manager.MMOLoadManager;
@@ -120,6 +121,7 @@ public class MMOCore extends JavaPlugin {
 	public final QuestManager questManager = new QuestManager();
 	public final ProfessionManager professionManager = new ProfessionManager();
 	public final EntityManager entities = new EntityManager();
+	public final ExperienceManager experience = new ExperienceManager();
 
 	/*
 	 * professions
@@ -131,7 +133,6 @@ public class MMOCore extends JavaPlugin {
 
 	public final MMOLoadManager loadManager = new MMOLoadManager();
 
-
 	public void onLoad() {
 		plugin = this;
 
@@ -378,6 +379,9 @@ public class MMOCore extends JavaPlugin {
 		attributeManager.clear();
 		attributeManager.reload();
 
+		// experience must be loaded before professions and classes
+		experience.reload();
+
 		professionManager.clear();
 		professionManager.reload();
 

src/main/java/net/Indyuce/mmocore/api/experience/Profession.java

@@ -10,15 +10,21 @@ import org.bukkit.potion.PotionType;
 
 import net.Indyuce.mmocore.MMOCore;
 import net.Indyuce.mmocore.api.load.MMOLoadException;
+import net.Indyuce.mmocore.api.player.ExpCurve;
 import net.Indyuce.mmocore.api.util.math.formula.LinearValue;
 import net.mmogroup.mmolib.MMOLib;
 import net.mmogroup.mmolib.api.MMOLineConfig;
 
 public class Profession {
-	private final String id, name, expCurve;
+	private final String id, name;
+	private final ExpCurve expCurve;
 
+	/*
+	 * experience given to the main player level whenever he levels up this
+	 * profession
+	 */
 	private final LinearValue experience;
-	
+
 	/*
 	 * removed when loaded
 	 */
@@ -31,7 +37,9 @@ public class Profession {
 		this.name = config.getString("name");
 		Validate.notNull(name, "Could not load name");
 
-		expCurve = config.getString("exp-curve", "levels");
+		expCurve = config.contains("exp-curve")
+				? MMOCore.plugin.experience.getOrThrow(config.get("exp-curve").toString().toLowerCase().replace("_", "-").replace(" ", "-"))
+				: ExpCurve.DEFAULT;
 		experience = new LinearValue(config.getConfigurationSection("experience"));
 
 		if (config.contains("exp-sources"))
@@ -110,10 +118,10 @@ public class Profession {
 		return name;
 	}
 
-	public String getEXPCurve() {
+	public ExpCurve getExpCurve() {
 		return expCurve;
 	}
-	
+
 	public int calculateExperience(int x) {
 		return (int) experience.calculate(x);
 	}

src/main/java/net/Indyuce/mmocore/api/player/ExpCurve.java

@@ -0,0 +1,67 @@
+package net.Indyuce.mmocore.api.player;
+
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileReader;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+
+import org.apache.commons.lang.Validate;
+
+public class ExpCurve {
+	private final String id;
+
+	/*
+	 * experience needed to level up. different professions or classes can have
+	 * different exp curves so that it is easier to balance.
+	 */
+	private final List<Integer> experience = new ArrayList<>();
+
+	/*
+	 * purely arbitrary but MMOCore needs a default exp curve for everything
+	 * otherwise there might be divisions by 0 when trying to update the vanilla
+	 * exp bar which requires a 0.0 -> 1.0 float as parameter
+	 */
+	public static final ExpCurve DEFAULT = new ExpCurve("default", 100, 200, 300, 400, 500);
+
+	/*
+	 * read exp curve from a file, one line after the other
+	 */
+	public ExpCurve(File file) throws IOException {
+		this.id = file.getName().replace(".txt", "").toLowerCase().replace("_", "-").replace(" ", "-");
+
+		BufferedReader reader = new BufferedReader(new FileReader(file));
+		String readLine;
+		while ((readLine = reader.readLine()) != null)
+			experience.add(Integer.valueOf(readLine));
+		reader.close();
+
+		Validate.isTrue(!experience.isEmpty(), "There must be at least one exp value in your exp curve");
+	}
+
+	/*
+	 * can be used by external plugins to register curves and it used by MMOCore
+	 * to create the default exp curve if none is selected
+	 */
+	public ExpCurve(String id, int... values) {
+		this.id = id;
+		for (int value : values)
+			experience.add(value);
+		Validate.isTrue(!experience.isEmpty(), "There must be at least one exp value in your exp curve");
+	}
+
+	public String getId() {
+		return id;
+	}
+
+	/*
+	 * retrieves the experience needed. the level serves as index for the list
+	 * checkup. if the level is higher than the amount of exp inputs, just
+	 * return the last list value
+	 */
+	public int getExperience(int level) {
+		Validate.isTrue(level > 0, "Level must be stricly positive");
+		return experience.get(Math.min(level, experience.size()) - 1);
+	}
+}

src/main/java/net/Indyuce/mmocore/api/player/PlayerData.java

@@ -119,7 +119,8 @@ public class PlayerData extends OfflinePlayerData {
 				j++;
 			} catch (NullPointerException notFound) {
 				boundSkills.remove(j);
-				MMOCore.log(Level.SEVERE, "[Userdata] Could not find skill " + boundSkills.get(j).getSkill().getId() + " in class " + getProfess().getId() + " while refreshing player data.");
+				MMOCore.log(Level.SEVERE, "[Userdata] Could not find skill " + boundSkills.get(j).getSkill().getId() + " in class "
+						+ getProfess().getId() + " while refreshing player data.");
 			}
 	}
 
@@ -191,6 +192,13 @@ public class PlayerData extends OfflinePlayerData {
 		return skillPoints;
 	}
 
+	/*
+	 * returns level up needed in order to level up
+	 */
+	public int getLevelUpExperience() {
+		return getProfess().getExpCurve().getExperience(getLevel() + 1);
+	}
+
 	// public int getSkillReallocationPoints() {
 	// return skillReallocationPoints;
 	// }
@@ -223,19 +231,19 @@ public class PlayerData extends OfflinePlayerData {
 	public void giveLevels(int value) {
 		int total = 0;
 		while (value-- > 0)
-			total += MMOCore.plugin.configManager.getNeededExperience(getLevel() + value + 1, getProfess());
+			total += getProfess().getExpCurve().getExperience(getLevel() + value + 1);
 		giveExperience(total);
 	}
 
 	public void setExperience(int value) {
 		experience = Math.max(0, value);
-		refreshVanillaExp(MMOCore.plugin.configManager.getNeededExperience(getLevel() + 1, getProfess()));
+		refreshVanillaExp();
 	}
 
-	public void refreshVanillaExp(float needed) {
+	public void refreshVanillaExp() {
 		if (MMOCore.plugin.configManager.overrideVanillaExp) {
 			player.setLevel(getLevel());
-			player.setExp((float) experience / needed);
+			player.setExp((float) experience / (float) getLevelUpExperience());
 		}
 	}
 
@@ -346,7 +354,8 @@ public class PlayerData extends OfflinePlayerData {
 		setLastFriendRequest(System.currentTimeMillis());
 
 		FriendRequest request = new FriendRequest(this, target);
-		new ConfigMessage("friend-request").addPlaceholders("player", getPlayer().getName(), "uuid", request.getUniqueId().toString()).sendAsJSon(target.getPlayer());
+		new ConfigMessage("friend-request").addPlaceholders("player", getPlayer().getName(), "uuid", request.getUniqueId().toString())
+				.sendAsJSon(target.getPlayer());
 		MMOCore.plugin.requestManager.registerRequest(request);
 	}
 
@@ -378,7 +387,9 @@ public class PlayerData extends OfflinePlayerData {
 				player.playSound(player.getLocation(), VersionSound.BLOCK_NOTE_BLOCK_BELL.toSound(), 1, (float) (t / Math.PI * .015 + .5));
 				double r = Math.sin((double) t / 100 * Math.PI);
 				for (double j = 0; j < Math.PI * 2; j += Math.PI / 4)
-					MMOLib.plugin.getVersion().getWrapper().spawnParticle(Particle.REDSTONE, player.getLocation().add(Math.cos((double) t / 20 + j) * r, (double) t / 50, Math.sin((double) t / 20 + j) * r), 1.25f, Color.PURPLE);
+					MMOLib.plugin.getVersion().getWrapper().spawnParticle(Particle.REDSTONE,
+							player.getLocation().add(Math.cos((double) t / 20 + j) * r, (double) t / 50, Math.sin((double) t / 20 + j) * r), 1.25f,
+							Color.PURPLE);
 			}
 		}.runTaskTimer(MMOCore.plugin, 0, 1);
 	}
@@ -400,7 +411,8 @@ public class PlayerData extends OfflinePlayerData {
 		// display hologram
 		if (MMOCore.plugin.getConfig().getBoolean("display-exp-holograms"))
 			if (loc != null && MMOCore.plugin.hologramSupport != null)
-				MMOCore.plugin.hologramSupport.displayIndicator(loc.add(.5, 1.5, .5), MMOCore.plugin.configManager.getSimpleMessage("exp-hologram", "exp", "" + value).message(), getPlayer());
+				MMOCore.plugin.hologramSupport.displayIndicator(loc.add(.5, 1.5, .5),
+						MMOCore.plugin.configManager.getSimpleMessage("exp-hologram", "exp", "" + value).message(), getPlayer());
 
 		value = MMOCore.plugin.boosterManager.calculateExp(null, value);
 		value *= 1 + getStats().getStat(StatType.ADDITIONAL_EXPERIENCE) / 100;
@@ -414,7 +426,7 @@ public class PlayerData extends OfflinePlayerData {
 
 		int needed;
 		boolean check = false;
-		while (experience >= (needed = MMOCore.plugin.configManager.getNeededExperience(getLevel() + 1, getProfess()))) {
+		while (experience >= (needed = getLevelUpExperience())) {
 
 			if (hasReachedMaxLevel()) {
 				experience = 0;
@@ -434,7 +446,7 @@ public class PlayerData extends OfflinePlayerData {
 			getStats().getMap().updateAll();
 		}
 
-		refreshVanillaExp(needed);
+		refreshVanillaExp();
 	}
 
 	public int getExperience() {

src/main/java/net/Indyuce/mmocore/api/player/Professions.java

@@ -49,12 +49,12 @@ public class Professions {
 
 	public String toJsonString() {
 		JsonObject json = new JsonObject();
-		for (Profession prof : MMOCore.plugin.professionManager.getAll()) {
+		for (Profession profession : MMOCore.plugin.professionManager.getAll()) {
-			JsonObject p = new JsonObject();
+			JsonObject object = new JsonObject();
-			p.addProperty("exp", getExperience(prof));
+			object.addProperty("exp", getExperience(profession));
-			p.addProperty("level", getLevel(prof));
+			object.addProperty("level", getLevel(profession));
 
-			json.add(prof.getId(), p);
+			json.add(profession.getId(), object);
 		}
 		return json.toString();
 	}
@@ -90,6 +90,10 @@ public class Professions {
 		return getExperience(profession.getId());
 	}
 
+	public int getLevelUpExperience(Profession profession) {
+		return profession.getExpCurve().getExperience(getLevel(profession) + 1);
+	}
+
 	public void setLevel(Profession profession, int value) {
 		level.put(profession.getId(), value);
 	}
@@ -101,7 +105,7 @@ public class Professions {
 	public void giveLevels(Profession profession, int value) {
 		int total = 0, level = getLevel(profession);
 		while (value-- > 0)
-			total += MMOCore.plugin.configManager.getNeededExperience(level + value + 1, profession);
+			total += profession.getExpCurve().getExperience(level + value + 1);
 		giveExperience(profession, total);
 	}
 
@@ -116,19 +120,21 @@ public class Professions {
 		// display hologram
 		if (MMOCore.plugin.getConfig().getBoolean("display-exp-holograms")) {
 			if (loc != null && MMOCore.plugin.hologramSupport != null)
-				MMOCore.plugin.hologramSupport.displayIndicator(loc.add(.5, 1.5, .5), MMOCore.plugin.configManager.getSimpleMessage("exp-hologram", "exp", "" + value).message(), playerData.getPlayer());
+				MMOCore.plugin.hologramSupport.displayIndicator(loc.add(.5, 1.5, .5),
+						MMOCore.plugin.configManager.getSimpleMessage("exp-hologram", "exp", "" + value).message(), playerData.getPlayer());
 		}
 
 		int needed, exp, level;
 		boolean check = false;
-		while ((exp = this.exp.get(profession.getId())) >= (needed = MMOCore.plugin.configManager.getNeededExperience((level = getLevel(profession)) + 1, profession))) {
+		while ((exp = this.exp.get(profession.getId())) >= (needed = profession.getExpCurve().getExperience((level = getLevel(profession)) + 1))) {
 			this.exp.put(profession.getId(), exp - needed);
 			this.level.put(profession.getId(), level + 1);
 			check = true;
 			playerData.giveExperience((int) profession.getExperience().calculate(level), null);
 			Bukkit.getPluginManager().callEvent(new PlayerLevelUpEvent(playerData, profession, level + 1));
 
-			new ConfigMessage("profession-level-up").addPlaceholders("level", "" + (level + 1), "profession", profession.getName()).send(playerData.getPlayer());
+			new ConfigMessage("profession-level-up").addPlaceholders("level", "" + (level + 1), "profession", profession.getName())
+					.send(playerData.getPlayer());
 			playerData.getPlayer().playSound(playerData.getPlayer().getLocation(), Sound.ENTITY_PLAYER_LEVELUP, 1, 2);
 		}
 		if (check)
@@ -138,6 +144,7 @@ public class Professions {
 		int chars = (int) ((double) exp / needed * 20);
 		for (int j = 0; j < 20; j++)
 			bar += (j == chars ? "" + ChatColor.WHITE + ChatColor.BOLD : "") + "|";
-		MMOCore.plugin.configManager.getSimpleMessage("exp-notification", "profession", profession.getName(), "progress", bar, "ratio", MMOCore.plugin.configManager.decimal.format((double) exp / needed * 100)).send(playerData.getPlayer());
+		MMOCore.plugin.configManager.getSimpleMessage("exp-notification", "profession", profession.getName(), "progress", bar, "ratio",
+				MMOCore.plugin.configManager.decimal.format((double) exp / needed * 100)).send(playerData.getPlayer());
 	}
 }

src/main/java/net/Indyuce/mmocore/api/player/profess/PlayerClass.java

@@ -26,6 +26,7 @@ import net.Indyuce.mmocore.MMOCore;
 import net.Indyuce.mmocore.api.AltChar;
 import net.Indyuce.mmocore.api.experience.source.type.ExperienceSource;
 import net.Indyuce.mmocore.api.load.MMOLoadException;
+import net.Indyuce.mmocore.api.player.ExpCurve;
 import net.Indyuce.mmocore.api.player.profess.event.EventTrigger;
 import net.Indyuce.mmocore.api.player.profess.resource.ManaDisplayOptions;
 import net.Indyuce.mmocore.api.player.profess.resource.PlayerResource;
@@ -41,12 +42,13 @@ import net.mmogroup.mmolib.api.MMOLineConfig;
 import net.mmogroup.mmolib.version.VersionMaterial;
 
 public class PlayerClass {
-	private final String name, id, fileName, expCurve;
+	private final String name, id, fileName;
 	private final List<String> description = new ArrayList<>(), attrDescription = new ArrayList<>();
 	private final ItemStack icon;
 	private final Map<ClassOption, Boolean> options = new HashMap<>();
 	private final ManaDisplayOptions manaDisplay;
 	private final int maxLevel, displayOrder;
+	private final ExpCurve expCurve;
 
 	private final Map<StatType, LinearValue> stats = new HashMap<>();
 	private final Map<String, SkillInfo> skills = new LinkedHashMap<>();
@@ -94,12 +96,16 @@ public class PlayerClass {
 		manaDisplay = new ManaDisplayOptions(config.getConfigurationSection("mana"));
 		maxLevel = config.getInt("max-level");
 		displayOrder = config.getInt("display-order");
-		expCurve = config.getString("exp-curve", "levels");
+
+		expCurve = config.contains("exp-curve")
+				? MMOCore.plugin.experience.getOrThrow(config.get("exp-curve").toString().toLowerCase().replace("_", "-").replace(" ", "-"))
+				: ExpCurve.DEFAULT;
 
 		if (config.contains("attributes"))
 			for (String key : config.getConfigurationSection("attributes").getKeys(false))
 				try {
-					stats.put(StatType.valueOf(key.toUpperCase().replace("-", "_")), new LinearValue(config.getConfigurationSection("attributes." + key)));
+					stats.put(StatType.valueOf(key.toUpperCase().replace("-", "_")),
+							new LinearValue(config.getConfigurationSection("attributes." + key)));
 				} catch (IllegalArgumentException exception) {
 					MMOCore.log(Level.WARNING, "[PlayerClasses:" + id + "] Could not load stat info '" + key + "': " + exception.getMessage());
 				}
@@ -156,9 +162,11 @@ public class PlayerClass {
 		for (PlayerResource resource : PlayerResource.values()) {
 			if (config.isConfigurationSection("resource." + resource.name().toLowerCase()))
 				try {
-					resourceHandlers.put(resource, new ResourceHandler(resource, config.getConfigurationSection("resource." + resource.name().toLowerCase())));
+					resourceHandlers.put(resource,
+							new ResourceHandler(resource, config.getConfigurationSection("resource." + resource.name().toLowerCase())));
 				} catch (IllegalArgumentException exception) {
-					MMOCore.log(Level.WARNING, "[PlayerClasses:" + id + "] Could not load special resource regen for " + resource.name() + ": " + exception.getMessage());
+					MMOCore.log(Level.WARNING, "[PlayerClasses:" + id + "] Could not load special resource regen for " + resource.name() + ": "
+							+ exception.getMessage());
 					resourceHandlers.put(resource, new ResourceHandler(resource));
 				}
 			else
@@ -176,7 +184,7 @@ public class PlayerClass {
 		manaDisplay = new ManaDisplayOptions(ChatColor.BLUE, "Mana", AltChar.listSquare.charAt(0));
 		maxLevel = 0;
 		displayOrder = 0;
-		expCurve = "";
+		expCurve = ExpCurve.DEFAULT;
 
 		this.icon = new ItemStack(material);
 		setOption(ClassOption.DISPLAY, false);
@@ -217,7 +225,7 @@ public class PlayerClass {
 		return displayOrder;
 	}
 
-	public String getEXPCurve() {
+	public ExpCurve getExpCurve() {
 		return expCurve;
 	}
 

src/main/java/net/Indyuce/mmocore/command/rpg/admin/InfoCommandMap.java

@@ -34,12 +34,17 @@ public class InfoCommandMap extends CommandEnd {
 		sender.sendMessage(ChatColor.YELLOW + "----------------------------------------------------");
 		sender.sendMessage(ChatColor.YELLOW + "Class: " + ChatColor.GOLD + playerData.getProfess().getName());
 		sender.sendMessage(ChatColor.YELLOW + "Level: " + ChatColor.GOLD + playerData.getLevel());
-		sender.sendMessage(ChatColor.YELLOW + "Experience: " + ChatColor.GOLD + playerData.getExperience() + ChatColor.YELLOW + " / " + ChatColor.GOLD + MMOCore.plugin.configManager.getNeededExperience(playerData.getLevel() + 1, playerData.getProfess()));
+		sender.sendMessage(ChatColor.YELLOW + "Experience: " + ChatColor.GOLD + playerData.getExperience() + ChatColor.YELLOW + " / " + ChatColor.GOLD
+				+ playerData.getLevelUpExperience());
 		sender.sendMessage(ChatColor.YELLOW + "Class Points: " + ChatColor.GOLD + playerData.getClassPoints());
-		sender.sendMessage(ChatColor.YELLOW + "Quests: " + ChatColor.GOLD + playerData.getQuestData().getFinishedQuests().size() + ChatColor.YELLOW + " / " + ChatColor.GOLD + MMOCore.plugin.questManager.getAll().size());
+		sender.sendMessage(ChatColor.YELLOW + "Quests: " + ChatColor.GOLD + playerData.getQuestData().getFinishedQuests().size() + ChatColor.YELLOW
+				+ " / " + ChatColor.GOLD + MMOCore.plugin.questManager.getAll().size());
 		sender.sendMessage(ChatColor.YELLOW + "----------------------------------------------------");
 		for (Profession profession : MMOCore.plugin.professionManager.getAll())
-			sender.sendMessage(ChatColor.YELLOW + profession.getName() + ": Lvl " + ChatColor.GOLD + playerData.getCollectionSkills().getLevel(profession) + ChatColor.YELLOW + " - " + ChatColor.GOLD + playerData.getCollectionSkills().getExperience(profession) + ChatColor.YELLOW + " / " + ChatColor.GOLD + MMOCore.plugin.configManager.getNeededExperience(playerData.getCollectionSkills().getLevel(profession) + 1, profession));
+			sender.sendMessage(
+					ChatColor.YELLOW + profession.getName() + ": Lvl " + ChatColor.GOLD + playerData.getCollectionSkills().getLevel(profession)
+							+ ChatColor.YELLOW + " - " + ChatColor.GOLD + playerData.getCollectionSkills().getExperience(profession)
+							+ ChatColor.YELLOW + " / " + ChatColor.GOLD + playerData.getCollectionSkills().getLevelUpExperience(profession));
 		sender.sendMessage(ChatColor.YELLOW + "----------------------------------------------------");
 		return CommandResult.SUCCESS;
 	}

src/main/java/net/Indyuce/mmocore/command/rpg/debug/Debug.java

@@ -1,7 +0,0 @@
-package net.Indyuce.mmocore.command.rpg.debug;
-
-import org.bukkit.ChatColor;
-
-public class Debug {
-	public static final String cmdPrefix = ChatColor.YELLOW + "[" + ChatColor.RED + "DEBUG" + ChatColor.GOLD + "] " + ChatColor.RESET;
-}

src/main/java/net/Indyuce/mmocore/command/rpg/debug/DebugCommandMap.java

@@ -1,10 +1,13 @@
 package net.Indyuce.mmocore.command.rpg.debug;
 
+import org.bukkit.ChatColor;
 import org.bukkit.command.CommandSender;
 
 import net.Indyuce.mmocore.command.api.CommandMap;
 
 public class DebugCommandMap extends CommandMap {
+	public static final String commandPrefix = ChatColor.YELLOW + "[" + ChatColor.RED + "DEBUG" + ChatColor.GOLD + "] " + ChatColor.RESET;
+
 	public DebugCommandMap(CommandMap parent) {
 		super(parent, "debug");
 

src/main/java/net/Indyuce/mmocore/command/rpg/debug/StatValueCommandMap.java

@@ -36,8 +36,8 @@ public class StatValueCommandMap extends CommandEnd {
 		}
 		
 		if(args.length > 3 && args[3].equals("true"))
-			sender.sendMessage(Debug.cmdPrefix + "Stat Value (" + ChatColor.BLUE + stat.name() + ChatColor.WHITE  + "): " + ChatColor.GREEN + stat.format(data.getStats().getStat(stat)) + ChatColor.WHITE + " *");
+			sender.sendMessage(DebugCommandMap.commandPrefix + "Stat Value (" + ChatColor.BLUE + stat.name() + ChatColor.WHITE  + "): " + ChatColor.GREEN + stat.format(data.getStats().getStat(stat)) + ChatColor.WHITE + " *");
-		else sender.sendMessage(Debug.cmdPrefix + "Stat Value (" + ChatColor.BLUE + stat.name() + ChatColor.WHITE + "): " + ChatColor.GREEN + data.getStats().getStat(stat));
+		else sender.sendMessage(DebugCommandMap.commandPrefix + "Stat Value (" + ChatColor.BLUE + stat.name() + ChatColor.WHITE + "): " + ChatColor.GREEN + data.getStats().getStat(stat));
 		
 		return CommandResult.SUCCESS;
 	}

src/main/java/net/Indyuce/mmocore/comp/placeholder/RPGPlaceholders.java

@@ -8,6 +8,7 @@ import org.bukkit.entity.Player;
 import me.clip.placeholderapi.expansion.PlaceholderExpansion;
 import net.Indyuce.mmocore.MMOCore;
 import net.Indyuce.mmocore.api.AltChar;
+import net.Indyuce.mmocore.api.experience.Profession;
 import net.Indyuce.mmocore.api.player.PlayerData;
 import net.Indyuce.mmocore.api.player.PlayerQuests;
 import net.Indyuce.mmocore.api.player.Professions;
@@ -40,7 +41,7 @@ public class RPGPlaceholders
 
 		else if (identifier.equals("level_percent")) {
 			PlayerData playerData = PlayerData.get(player);
-			double current = playerData.getExperience(), next = MMOCore.plugin.configManager.getNeededExperience(playerData.getLevel() + 1, playerData.getProfess());
+			double current = playerData.getExperience(), next = playerData.getLevelUpExperience();
 			return MMOCore.plugin.configManager.decimal.format(current / next * 100);
 		}
 
@@ -55,8 +56,10 @@ public class RPGPlaceholders
 
 		else if (identifier.startsWith("profession_percent_")) {
 			Professions professions = PlayerData.get(player).getCollectionSkills();
-			String profession = identifier.substring(19).replace(" ", "-").replace("_", "-").toLowerCase();
+			String name = identifier.substring(19).replace(" ", "-").replace("_", "-").toLowerCase();
-			double current = professions.getExperience(profession), next = MMOCore.plugin.configManager.getNeededExperience(professions.getLevel(profession) + 1, profession);
+			Profession profession = MMOCore.plugin.professionManager.get(name);
+			double current = professions.getExperience(profession),
+					next = professions.getLevelUpExperience(profession);
 			return MMOCore.plugin.configManager.decimal.format(current / next * 100);
 		}
 
@@ -70,7 +73,7 @@ public class RPGPlaceholders
 			return "" + PlayerData.get(player).getExperience();
 
 		else if (identifier.equals("next_level"))
-			return "" + MMOCore.plugin.configManager.getNeededExperience(PlayerData.get(player).getLevel() + 1, PlayerData.get(player).getProfess());
+			return "" +PlayerData.get(player).getLevelUpExperience();
 
 		else if (identifier.equals("class_points"))
 			return "" + PlayerData.get(player).getClassPoints();
@@ -135,7 +138,10 @@ public class RPGPlaceholders
 
 		else if (identifier.equals("quest_progress")) {
 			PlayerQuests data = PlayerData.get(player).getQuestData();
-			return data.hasCurrent() ? MMOCore.plugin.configManager.decimal.format((int) (double) data.getCurrent().getObjectiveNumber() / data.getCurrent().getQuest().getObjectives().size() * 100) : "0";
+			return data.hasCurrent()
+					? MMOCore.plugin.configManager.decimal
+							.format((int) (double) data.getCurrent().getObjectiveNumber() / data.getCurrent().getQuest().getObjectives().size() * 100)
+					: "0";
 		}
 
 		else if (identifier.equals("quest_objective")) {

src/main/java/net/Indyuce/mmocore/gui/ClassConfirmation.java

@@ -47,7 +47,7 @@ public class ClassConfirmation extends EditableInventory {
 			SavedClassInformation info = inv.getPlayerData().getClassInfo(profess);
 			Placeholders holders = new Placeholders();
 
-			int nextLevelExp = MMOCore.plugin.configManager.getNeededExperience(info.getLevel() + 1, profess);
+			int nextLevelExp = inv.getPlayerData().getLevelUpExperience();
 			double ratio = (double) info.getExperience() / (double) nextLevelExp;
 
 			String bar = "" + ChatColor.BOLD;

src/main/java/net/Indyuce/mmocore/gui/PlayerStats.java

@@ -79,7 +79,8 @@ public class PlayerStats extends EditableInventory {
 					Placeholders holders = new Placeholders();
 					net.Indyuce.mmocore.api.player.stats.PlayerStats stats = inv.getPlayerData().getStats();
 
-					double ratio = (double) inv.getPlayerData().getCollectionSkills().getExperience(profession) / MMOCore.plugin.configManager.getNeededExperience(inv.getPlayerData().getCollectionSkills().getLevel(profession) + 1, profession);
+					double ratio = (double) inv.getPlayerData().getCollectionSkills().getExperience(profession)
+							/ (double) inv.getPlayerData().getCollectionSkills().getLevelUpExperience(profession);
 
 					String bar = "" + ChatColor.BOLD;
 					int chars = (int) (ratio * 20);
@@ -277,7 +278,7 @@ public class PlayerStats extends EditableInventory {
 			PlayerData data = inv.getPlayerData();
 			Placeholders holders = new Placeholders();
 
-			int nextLevelExp = MMOCore.plugin.configManager.getNeededExperience(data.getLevel() + 1, data.getProfess());
+			int nextLevelExp = inv.getPlayerData().getLevelUpExperience();
 			double ratio = (double) data.getExperience() / (double) nextLevelExp;
 
 			String bar = "" + ChatColor.BOLD;

src/main/java/net/Indyuce/mmocore/manager/ConfigManager.java

@@ -1,16 +1,11 @@
 package net.Indyuce.mmocore.manager;
 
-import java.io.BufferedReader;
 import java.io.File;
-import java.io.FileReader;
 import java.io.IOException;
 import java.nio.file.Files;
 import java.text.DecimalFormat;
 import java.text.DecimalFormatSymbols;
-import java.util.ArrayList;
-import java.util.HashMap;
 import java.util.List;
-import java.util.Map;
 import java.util.logging.Level;
 
 import org.bukkit.ChatColor;
@@ -20,9 +15,7 @@ import org.bukkit.util.Consumer;
 
 import net.Indyuce.mmocore.MMOCore;
 import net.Indyuce.mmocore.api.ConfigFile;
-import net.Indyuce.mmocore.api.experience.Profession;
 import net.Indyuce.mmocore.api.player.PlayerData;
-import net.Indyuce.mmocore.api.player.profess.PlayerClass;
 import net.Indyuce.mmocore.api.util.input.AnvilGUI;
 import net.Indyuce.mmocore.api.util.input.ChatInput;
 import net.Indyuce.mmocore.api.util.input.PlayerInput;
@@ -39,7 +32,6 @@ public class ConfigManager {
 	public final DecimalFormatSymbols formatSymbols = new DecimalFormatSymbols();
 	public final DecimalFormat decimal = new DecimalFormat("0.#", formatSymbols), decimals = new DecimalFormat("0.##", formatSymbols);
 
-	private Map<String, List<Integer>> neededExp = new HashMap<String, List<Integer>>();
 	private FileConfiguration messages;
 	private boolean chatInput;
 
@@ -82,7 +74,7 @@ public class ConfigManager {
 			loadDefaultFile("classes", "rogue.yml");
 			loadDefaultFile("classes", "warrior.yml");
 		}
-		
+
 		if (!new File(MMOCore.plugin.getDataFolder() + "/expcurves").exists()) {
 			loadDefaultFile("expcurves", "levels.txt");
 			loadDefaultFile("expcurves", "mining.txt");
@@ -115,37 +107,17 @@ public class ConfigManager {
 		staminaFull = getColorOrDefault("stamina-whole", ChatColor.GREEN);
 		staminaHalf = getColorOrDefault("stamina-half", ChatColor.DARK_GREEN);
 		staminaEmpty = getColorOrDefault("stamina-empty", ChatColor.WHITE);
-		
-		neededExp.clear();
-		for(File txt : new File(MMOCore.plugin.getDataFolder() + "/expcurves").listFiles()) {
-			int line = 0;
-			try {
-				line++;
-				//File txt = new File(MMOCore.plugin.getDataFolder(), "levels.txt");
-				BufferedReader reader = new BufferedReader(new FileReader(txt));
-				String readLine;
-				List<Integer> levels = new ArrayList<>();
-				while ((readLine = reader.readLine()) != null)
-					levels.add(Integer.valueOf(readLine));
-				neededExp.put(txt.getName().toLowerCase().replace(".txt", ""), levels);
-				reader.close();
-			} catch (IOException | IllegalArgumentException e) {
-				MMOCore.plugin.getLogger().log(Level.SEVERE, "Could not read line " + line + " from " + txt.getName());
-				e.printStackTrace();
-			}
-		}
 	}
 
 	private ChatColor getColorOrDefault(String key, ChatColor defaultColor) {
 		try {
 			return ChatColor.valueOf(MMOCore.plugin.getConfig().getString("resource-bar-colors." + key).toUpperCase());
-		}
+		} catch (IllegalArgumentException exception) {
-		catch(IllegalArgumentException exception) {
 			MMOCore.log(Level.WARNING, "Could not read resource bar color from '" + key + "': using default.");
 			return defaultColor;
 		}
 	}
-	
+
 	public DecimalFormat newFormat(String pattern) {
 		return new DecimalFormat(pattern, formatSymbols);
 	}
@@ -176,24 +148,6 @@ public class ConfigManager {
 			}
 	}
 
-	public int getNeededExperience(int level, PlayerClass clas) {
-		if(clas == null) return getNeededExperience(level, MMOCore.plugin.classManager.getDefaultClass().getEXPCurve());
-		return getNeededExperience(level, clas.getEXPCurve());
-	}
-
-	public int getNeededExperience(int level, Profession prof) {
-		return getNeededExperience(level, prof.getEXPCurve());
-	}
-
-	public int getNeededExperience(int level, String curve) {
-		List<Integer> expCurve = neededExp.get(curve);
-		if(expCurve == null) {
-			MMOCore.log(Level.SEVERE, "Couldn't load EXPCurve: '" + curve + "'. Does it exist?");
-			return 1;
-		}
-		return expCurve.get(level - 1 >= expCurve.size() ? expCurve.size() - 1 : level - 1);
-	}
-	
 	public List<String> getMessage(String key) {
 		return messages.getStringList(key);
 	}
@@ -204,7 +158,7 @@ public class ConfigManager {
 			format = format.replace("{" + placeholders[j] + "}", placeholders[j + 1]);
 		return new SimpleMessage(ChatColor.translateAlternateColorCodes('&', format));
 	}
-	
+
 	public class SimpleMessage {
 		private final String message;
 

src/main/java/net/Indyuce/mmocore/manager/ExperienceManager.java

@@ -0,0 +1,46 @@
+package net.Indyuce.mmocore.manager;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.logging.Level;
+
+import org.apache.commons.lang.Validate;
+
+import net.Indyuce.mmocore.MMOCore;
+import net.Indyuce.mmocore.api.player.ExpCurve;
+import net.Indyuce.mmoitems.MMOItems;
+
+public class ExperienceManager {
+	private final Map<String, ExpCurve> expCurves = new HashMap<>();
+
+	public boolean hasCurve(String id) {
+		return expCurves.containsKey(id);
+	}
+
+	public ExpCurve getOrThrow(String id) {
+		Validate.isTrue(hasCurve(id), "Could not find exp curve with ID '" + id + "'");
+		return expCurves.get(id);
+	}
+
+	public ExpCurve getCurve(String id) {
+		return expCurves.get(id);
+	}
+
+	public Collection<ExpCurve> getCurves() {
+		return expCurves.values();
+	}
+
+	public void reload() {
+		expCurves.clear();
+		for (File file : new File(MMOCore.plugin.getDataFolder() + "/expcurves").listFiles())
+			try {
+				ExpCurve curve = new ExpCurve(file);
+				expCurves.put(curve.getId(), curve);
+			} catch (IllegalArgumentException | IOException exception) {
+				MMOItems.plugin.getLogger().log(Level.WARNING, "Could not load exp curve '" + file.getName() + "': " + exception.getMessage());
+			}
+	}
+}

src/main/java/net/Indyuce/mmocore/manager/data/GuildDataManager.java

@@ -11,15 +11,15 @@ import org.bukkit.configuration.file.FileConfiguration;
 import net.Indyuce.mmocore.api.ConfigFile;
 import net.Indyuce.mmocore.api.player.social.guilds.Guild;
 
-public abstract class GuildDataManager {	
+public abstract class GuildDataManager {
 	protected final Map<String, Guild> guilds = new HashMap<>();
-	
+
 	public Guild newRegisteredGuild(UUID owner, String name, String tag) {
 		Guild guild = new Guild(owner, name, tag);
 		registerGuild(guild);
 		return guild;
 	}
-	
+
 	public void registerGuild(Guild guild) {
 		guilds.put(guild.getId(), guild);
 	}
@@ -31,85 +31,103 @@ public abstract class GuildDataManager {
 	public boolean isRegistered(String tag) {
 		return guilds.containsKey(tag);
 	}
-	
+
 	public void unregisterGuild(Guild guild) {
 		guild.getMembers().forEach(member -> guild.removeMember(member, true));
-		guild.getMembers().clear();
+		// guild.getMembers().clear();
 		guilds.remove(guild.getId());
 		delete(guild);
 	}
 
 	public Guild stillInGuild(UUID uuid, String id) {
 		Guild guild = getGuild(id);
-		if(guild != null && guild.getMembers().has(uuid))
+		if (guild != null && guild.getMembers().has(uuid))
 			return guild;
 		return null;
 	}
-	
+
-	public Guild getGuild(String guild)
+	public Guild getGuild(String guild) {
-	{ return guilds.get(guild); }
+		return guilds.get(guild);
-	
+	}
-	public Collection<Guild> getAll()
+
-	{ return guilds.values(); }
+	public Collection<Guild> getAll() {
-	
+		return guilds.values();
+	}
+
 	public void reload() {
-		for(Guild guild : guilds.values())
+		for (Guild guild : guilds.values())
 			save(guild);
 		guilds.clear();
 		load();
 		config = new GuildConfiguration();
 	}
-	
+
 	public abstract void save(Guild guild);
+
 	public abstract void load();
+
 	public abstract void delete(Guild guild);
 
-	//Shitty code for loading config values for guilds.
+	// Shitty code for loading config values for guilds.
 	private GuildConfiguration config;
+
 	public GuildConfiguration getConfig() {
-		if(config == null)
+		if (config == null)
 			config = new GuildConfiguration();
 		return config;
 	}
+
 	public class GuildConfiguration {
 		private final String prefix;
 		private final boolean uppercaseTags;
 		private final NamingRules tagRules, nameRules;
-		
+
 		public GuildConfiguration() {
 			FileConfiguration config = new ConfigFile("guilds").getConfig();
-			
+
 			this.prefix = config.getString("chat-prefix", "*");
 			this.uppercaseTags = config.getBoolean("uppercase-tags", true);
 			this.tagRules = new NamingRules(config.getConfigurationSection("rules.tag"));
 			this.nameRules = new NamingRules(config.getConfigurationSection("rules.name"));
 		}
-		
+
-		public String getPrefix()
+		public String getPrefix() {
-		{ return prefix; }
+			return prefix;
-		public boolean shouldUppercaseTags()
+		}
-		{ return uppercaseTags; }
+
-		public NamingRules getTagRules()
+		public boolean shouldUppercaseTags() {
-		{ return tagRules; }
+			return uppercaseTags;
-		public NamingRules getNameRules()
+		}
-		{ return nameRules; }
+
-		
+		public NamingRules getTagRules() {
+			return tagRules;
+		}
+
+		public NamingRules getNameRules() {
+			return nameRules;
+		}
+
 		public class NamingRules {
 			private final String regex;
 			private final int min, max;
-			
+
 			public NamingRules(ConfigurationSection config) {
 				regex = config.getString("matches", "[a-zA-Z-_!?]+");
 				min = config.getInt("min-length", 3);
 				max = config.getInt("max-length", 5);
 			}
-			
+
-			public String getRegex()
+			public String getRegex() {
-			{ return regex; }
+				return regex;
-			public int getMin()
+			}
-			{ return min; }
+
-			public int getMax()
+			public int getMin() {
-			{ return max; }
+				return min;
+			}
+
+			public int getMax() {
+				return max;
+			}
 		}
 	}
 }