Enchantment.java

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package org.bukkit.enchantments;

import java.util.HashMap;
import java.util.Map;

import org.bukkit.command.defaults.EnchantCommand;
import org.bukkit.inventory.ItemStack;

public abstract class Enchantment {
    public static final Enchantment PROTECTION_ENVIRONMENTAL = new EnchantmentWrapper(0);

    public static final Enchantment PROTECTION_FIRE = new EnchantmentWrapper(1);

    public static final Enchantment PROTECTION_FALL = new EnchantmentWrapper(2);

    public static final Enchantment PROTECTION_EXPLOSIONS = new EnchantmentWrapper(3);

    public static final Enchantment PROTECTION_PROJECTILE = new EnchantmentWrapper(4);

    public static final Enchantment OXYGEN = new EnchantmentWrapper(5);

    public static final Enchantment WATER_WORKER = new EnchantmentWrapper(6);

    public static final Enchantment THORNS = new EnchantmentWrapper(7);

    public static final Enchantment DAMAGE_ALL = new EnchantmentWrapper(16);

    public static final Enchantment DAMAGE_UNDEAD = new EnchantmentWrapper(17);

    public static final Enchantment DAMAGE_ARTHROPODS = new EnchantmentWrapper(18);

    public static final Enchantment KNOCKBACK = new EnchantmentWrapper(19);

    public static final Enchantment FIRE_ASPECT = new EnchantmentWrapper(20);

    public static final Enchantment LOOT_BONUS_MOBS = new EnchantmentWrapper(21);

    public static final Enchantment DIG_SPEED = new EnchantmentWrapper(32);

    public static final Enchantment SILK_TOUCH = new EnchantmentWrapper(33);

    public static final Enchantment DURABILITY = new EnchantmentWrapper(34);

    public static final Enchantment LOOT_BONUS_BLOCKS = new EnchantmentWrapper(35);

    public static final Enchantment ARROW_DAMAGE = new EnchantmentWrapper(48);

    public static final Enchantment ARROW_KNOCKBACK = new EnchantmentWrapper(49);

    public static final Enchantment ARROW_FIRE = new EnchantmentWrapper(50);

    public static final Enchantment ARROW_INFINITE = new EnchantmentWrapper(51);

    private static final Map<Integer, Enchantment> byId = new HashMap<Integer, Enchantment>();
    private static final Map<String, Enchantment> byName = new HashMap<String, Enchantment>();
    private static boolean acceptingNew = true;
    private final int id;

    public Enchantment(int id) {
        this.id = id;
    }

    public int getId() {
        return id;
    }

    public abstract String getName();

    public abstract int getMaxLevel();

    public abstract int getStartLevel();

    public abstract EnchantmentTarget getItemTarget();

    public abstract boolean conflictsWith(Enchantment other);

    public abstract boolean canEnchantItem(ItemStack item);

    @Override
    public boolean equals(Object obj) {
        if (obj == null) {
            return false;
        }
        if (!(obj instanceof Enchantment)) {
            return false;
        }
        final Enchantment other = (Enchantment) obj;
        if (this.id != other.id) {
            return false;
        }
        return true;
    }

    @Override
    public int hashCode() {
        return id;
    }

    @Override
    public String toString() {
        return "Enchantment[" + id + ", " + getName() + "]";
    }

    public static void registerEnchantment(Enchantment enchantment) {
        if (byId.containsKey(enchantment.id) || byName.containsKey(enchantment.getName())) {
            throw new IllegalArgumentException("Cannot set already-set enchantment");
        } else if (!isAcceptingRegistrations()) {
            throw new IllegalStateException("No longer accepting new enchantments (can only be done by the server implementation)");
        }

        byId.put(enchantment.id, enchantment);
        byName.put(enchantment.getName(), enchantment);
    }

    public static boolean isAcceptingRegistrations() {
        return acceptingNew;
    }

    public static void stopAcceptingRegistrations() {
        acceptingNew = false;
        EnchantCommand.buildEnchantments();
    }

    public static Enchantment getById(int id) {
        return byId.get(id);
    }

    public static Enchantment getByName(String name) {
        return byName.get(name);
    }

    public static Enchantment[] values() {
        return byId.values().toArray(new Enchantment[byId.size()]);
    }
}