Add Beast Master and make an overall improvement for all the mod

src/main/java/net/babamod/mineclass/classes/BeastMasterClass.java

@@ -0,0 +1,85 @@
+package net.babamod.mineclass.classes;
+
+import net.babamod.mineclass.utils.Pair;
+import org.bukkit.Material;
+import org.bukkit.enchantments.Enchantment;
+import org.bukkit.entity.Player;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.potion.PotionEffectType;
+
+import java.util.*;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+public class BeastMasterClass extends MineClassImpl {
+
+  private static final Set<Material> forbiddenItems =
+      new HashSet<Material>() {
+        {
+          add(Material.DIAMOND_PICKAXE);
+          add(Material.GOLDEN_PICKAXE);
+          add(Material.IRON_PICKAXE);
+          add(Material.NETHERITE_PICKAXE);
+          add(Material.CROSSBOW);
+          add(Material.TRIDENT);
+        }
+      };
+
+  private static final Map<PotionEffectType, Integer> potionEffects =
+      Stream.of(
+              new Object[][] {
+                {PotionEffectType.NIGHT_VISION, 1},
+                {PotionEffectType.SLOW, 1},
+                {PotionEffectType.WEAKNESS, 1},
+              })
+          .collect(Collectors.toMap(data -> (PotionEffectType) data[0], data -> (Integer) data[1]));
+
+  private static final Map<Material, List<Pair<Enchantment, Integer>>> classEnchantments =
+      Stream.of(
+              new AbstractMap.SimpleEntry<>(
+                  Material.BONE, new ArrayList<Pair<Enchantment, Integer>>()),
+              new AbstractMap.SimpleEntry<>(
+                  Material.SALMON, new ArrayList<Pair<Enchantment, Integer>>()),
+              new AbstractMap.SimpleEntry<>(
+                  Material.SADDLE, new ArrayList<Pair<Enchantment, Integer>>()))
+          .collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue));
+
+  @Override
+  public Set<Material> getForbiddenItems() {
+    return forbiddenItems;
+  }
+
+  @Override
+  public Map<PotionEffectType, Integer> getPotionEffects() {
+    return potionEffects;
+  }
+
+  @Override
+  public Map<Material, List<Pair<Enchantment, Integer>>> getClassEnchantments() {
+    return classEnchantments;
+  }
+
+  @Override
+  public String getCode() {
+    return "beast_master";
+  }
+
+  @Override
+  public void giveItems(Player player) {
+    if (!player.getInventory().contains(Material.BONE)) {
+      ItemStack itemStack = new ItemStack(Material.BONE, 1);
+      enchantItem(itemStack);
+      player.getInventory().addItem(itemStack);
+    }
+    if (!player.getInventory().contains(Material.SALMON)) {
+      ItemStack itemStack = new ItemStack(Material.SALMON, 1);
+      enchantItem(itemStack);
+      player.getInventory().addItem(itemStack);
+    }
+    if (!player.getInventory().contains(Material.SADDLE)) {
+      ItemStack itemStack = new ItemStack(Material.SADDLE, 1);
+      enchantItem(itemStack);
+      player.getInventory().addItem(itemStack);
+    }
+  }
+}