ArmorUtil.java

package me.gtacraft.util;

import net.minecraft.server.v1_7_R3.Enchantment;

import org.bukkit.Material;
import org.bukkit.entity.LivingEntity;
import org.bukkit.entity.Player;
import org.bukkit.inventory.ItemStack;

public class ArmorUtil {

    public static float getArmorDamageNullificationPercent(float armor_val){
        if(armor_val == 0)
            return 1F;

        return 1F - (armor_val * 0.04F);
    }

    public static float getEnchantDamageModifier(Player pl){
        ItemStack weapon = pl.getItemInHand();
        float damage_mod = 0.0F;
        if(weapon != null){
            if(!(weapon.getType() == Material.BOW) && weapon.getEnchantments().containsKey(Enchantment.DAMAGE_ALL)){
                damage_mod = (float)weapon.getEnchantments().get(Enchantment.DAMAGE_ALL) * 0.625F;
            }
            if(weapon.getType() == Material.BOW  && weapon.getEnchantments().containsKey(Enchantment.ARROW_DAMAGE)){
                damage_mod = 0.25F * ((float)weapon.getEnchantments().get(Enchantment.ARROW_DAMAGE) + 1);
            }
        }

        return damage_mod;
    }

    public static double recomputeDamage(LivingEntity entity, double original) {
        return original * getArmorDamageNullificationPercent(getArmorValue(entity));
    }

    public static int getArmorValue(LivingEntity pl) {
        int armor_val = 0;
        for(ItemStack is : pl.getEquipment().getArmorContents()){
            if(is == null || is.getType() == Material.AIR)
                continue;

            if(is.getType() == Material.LEATHER_HELMET)
                armor_val += 1;
            if(is.getType() == Material.LEATHER_CHESTPLATE)
                armor_val += 3;
            if(is.getType() == Material.LEATHER_LEGGINGS)
                armor_val += 2;
            if(is.getType() == Material.LEATHER_BOOTS)
                armor_val += 1;

            if(is.getType() == Material.CHAINMAIL_HELMET)
                armor_val += 2;
            if(is.getType() == Material.CHAINMAIL_CHESTPLATE)
                armor_val += 5;
            if(is.getType() == Material.CHAINMAIL_LEGGINGS)
                armor_val += 4;
            if(is.getType() == Material.CHAINMAIL_BOOTS)
                armor_val += 1;

            if(is.getType() == Material.IRON_HELMET)
                armor_val += 2;
            if(is.getType() == Material.IRON_CHESTPLATE)
                armor_val += 6;
            if(is.getType() == Material.IRON_LEGGINGS)
                armor_val += 5;
            if(is.getType() == Material.IRON_BOOTS)
                armor_val += 2;

            if(is.getType() == Material.DIAMOND_HELMET)
                armor_val += 3;
            if(is.getType() == Material.DIAMOND_CHESTPLATE)
                armor_val += 8;
            if(is.getType() == Material.DIAMOND_LEGGINGS)
                armor_val += 6;
            if(is.getType() == Material.DIAMOND_BOOTS)
                armor_val += 3;

            if(is.getType() == Material.GOLD_HELMET)
                armor_val += 2;
            if(is.getType() == Material.GOLD_CHESTPLATE)
                armor_val += 5;
            if(is.getType() == Material.GOLD_LEGGINGS)
                armor_val += 3;
            if(is.getType() == Material.GOLD_BOOTS)
                armor_val += 1;
        }

        return armor_val;
    }
}