public static Optional<Tuple<DamageModifier, Function<? super Double, Double>>>
createResistanceModifier(EntityLivingBase entityLivingBase, DamageSource damageSource) {
if (!damageSource.isDamageAbsolute()
&& entityLivingBase.isPotionActive(Potion.resistance)
&& damageSource != DamageSource.outOfWorld) {
PotionEffect effect =
((PotionEffect) entityLivingBase.getActivePotionEffect(Potion.resistance));
return Optional.of(
new Tuple<>(
DamageModifier.builder()
.cause(Cause.of(NamedCause.of(DamageEntityEvent.RESISTANCE, effect)))
.type(DamageModifierTypes.DEFENSIVE_POTION_EFFECT)
.build(),
createResistanceFunction(effect.getAmplifier())));
}
return Optional.empty();
}
public static Optional<Tuple<DamageModifier, Function<? super Double, Double>>>
createHardHatModifier(EntityLivingBase entityLivingBase, DamageSource damageSource) {
if ((damageSource instanceof FallingBlockDamageSource)
&& entityLivingBase.getEquipmentInSlot(4) != null) {
DamageModifier modifier =
DamageModifier.builder()
.cause(
Cause.of(
NamedCause.of(
DamageEntityEvent.HARD_HAT_ARMOR,
((ItemStack) entityLivingBase.getEquipmentInSlot(4)).createSnapshot())))
.type(DamageModifierTypes.HARD_HAT)
.build();
return Optional.of(new Tuple<>(modifier, HARD_HAT_FUNCTION));
}
return Optional.empty();
}
/**
* Only used in Vanilla. The Forge version is much different. Basically, this accepts the various
* "objects" needed to work for an armor piece to be "damaged".
*
* <p>This is also where we can likely throw a damage item event.
*
* @param entity
* @param damageSource
* @param modifier
* @param damage
*/
public static void acceptArmorModifier(
EntityLivingBase entity, DamageSource damageSource, DamageModifier modifier, double damage) {
Optional<DamageObject> property = modifier.getCause().first(DamageObject.class);
final net.minecraft.item.ItemStack[] inventory =
entity instanceof EntityPlayer
? ((EntityPlayer) entity).inventory.armorInventory
: entity.getInventory();
if (property.isPresent()) {
damage = Math.abs(damage) * 25;
net.minecraft.item.ItemStack stack = inventory[property.get().slot];
int itemDamage = (int) (damage / 25D < 1 ? 1 : damage / 25D);
stack.damageItem(itemDamage, entity);
if (stack.stackSize <= 0) {
inventory[property.get().slot] = null;
}
}
}
public static Optional<Tuple<DamageModifier, Function<? super Double, Double>>>
createBlockingModifier(EntityLivingBase entityLivingBase, DamageSource damageSource) {
if (!damageSource.isUnblockable()
&& (entityLivingBase instanceof EntityPlayer
&& ((EntityPlayer) entityLivingBase).isBlocking())) {
DamageModifier modifier =
DamageModifier.builder()
.cause(
Cause.of(
NamedCause.of(
DamageEntityEvent.BLOCKING,
((ItemStack) ((EntityPlayer) entityLivingBase).getCurrentEquippedItem())
.createSnapshot())))
.type(DamageModifierTypes.BLOCKING)
.build();
return Optional.of(new Tuple<>(modifier, BLOCKING_FUNCTION));
}
return Optional.empty();
}
public static Optional<Tuple<DamageModifier, Function<? super Double, Double>>>
createAbsorptionModifier(EntityLivingBase entityLivingBase, DamageSource damageSource) {
if (entityLivingBase.isPotionActive(Potion.absorption)) {
Function<? super Double, Double> function =
damage ->
-(Math.max(
damage - Math.max(damage - entityLivingBase.getAbsorptionAmount(), 0.0F), 0.0F));
DamageModifier modifier =
DamageModifier.builder()
.cause(
Cause.of(
NamedCause.of(
DamageEntityEvent.ABSORPTION,
entityLivingBase.getActivePotionEffect(Potion.absorption)),
NamedCause.of(DamageEntityEvent.CREATOR, entityLivingBase)))
.type(DamageModifierTypes.ABSORPTION)
.build();
return Optional.of(new Tuple<>(modifier, function));
}
return Optional.empty();
}
public static Optional<List<Tuple<DamageModifier, Function<? super Double, Double>>>>
createEnchantmentModifiers(EntityLivingBase entityLivingBase, DamageSource damageSource) {
net.minecraft.item.ItemStack[] inventory =
entityLivingBase instanceof EntityPlayer
? ((EntityPlayer) entityLivingBase).inventory.armorInventory
: entityLivingBase.getInventory();
if (EnchantmentHelper.getEnchantmentModifierDamage(inventory, damageSource) == 0) {
return Optional.empty();
}
List<Tuple<DamageModifier, Function<? super Double, Double>>> modifiers = new ArrayList<>();
boolean first = true;
int totalModifier = 0;
for (net.minecraft.item.ItemStack itemStack : inventory) {
if (itemStack == null) {
continue;
}
NBTTagList enchantmentList = itemStack.getEnchantmentTagList();
if (enchantmentList == null) {
continue;
}
for (int i = 0; i < enchantmentList.tagCount(); ++i) {
final short enchantmentId =
enchantmentList.getCompoundTagAt(i).getShort(NbtDataUtil.ITEM_ENCHANTMENT_ID);
final short level =
enchantmentList.getCompoundTagAt(i).getShort(NbtDataUtil.ITEM_ENCHANTMENT_LEVEL);
if (Enchantment.getEnchantmentById(enchantmentId) != null) {
// Ok, we have an enchantment!
final Enchantment enchantment = Enchantment.getEnchantmentById(enchantmentId);
final int temp = enchantment.calcModifierDamage(level, damageSource);
if (temp != 0) {
ItemStackSnapshot snapshot = ((ItemStack) itemStack).createSnapshot();
// Now we can actually consider this as a modifier!
final DamageObject object = new DamageObject();
int modifier = enchantment.calcModifierDamage(level, damageSource);
object.previousDamage = totalModifier;
if (object.previousDamage > 25) {
object.previousDamage = 25;
}
totalModifier += modifier;
object.augment = first;
object.ratio = modifier;
Function<? super Double, Double> enchantmentFunction =
damageIn -> {
if (object.augment) {
enchantmentDamageTracked = damageIn;
}
if (damageIn <= 0) {
return 0D;
}
double actualDamage = enchantmentDamageTracked;
if (object.previousDamage > 25) {
return 0D;
}
double modifierDamage = actualDamage;
double magicModifier;
if (modifier > 0 && modifier <= 20) {
int j = 25 - modifier;
magicModifier = modifierDamage * (float) j;
modifierDamage = magicModifier / 25.0F;
}
return -Math.max(actualDamage - modifierDamage, 0.0D);
};
if (first) {
first = false;
}
DamageModifier enchantmentModifier =
DamageModifier.builder()
.cause(
Cause.of(
NamedCause.of("ArmorEnchantment", enchantment),
NamedCause.of("ItemStack", snapshot),
NamedCause.of(DamageEntityEvent.SOURCE, entityLivingBase)))
.type(DamageModifierTypes.ARMOR_ENCHANTMENT)
.build();
modifiers.add(new Tuple<>(enchantmentModifier, enchantmentFunction));
}
}
}
}
if (!modifiers.isEmpty()) {
return Optional.of(modifiers);
} else {
return Optional.empty();
}
}
public static Optional<List<Tuple<DamageModifier, Function<? super Double, Double>>>>
createArmorModifiers(
EntityLivingBase entityLivingBase, DamageSource damageSource, double damage) {
if (!damageSource.isDamageAbsolute()) {
damage *= 25;
net.minecraft.item.ItemStack[] inventory =
entityLivingBase instanceof EntityPlayer
? ((EntityPlayer) entityLivingBase).inventory.armorInventory
: entityLivingBase.getInventory();
List<Tuple<DamageModifier, Function<? super Double, Double>>> modifiers = new ArrayList<>();
List<DamageObject> damageObjects = new ArrayList<>();
for (int index = 0; index < inventory.length; index++) {
net.minecraft.item.ItemStack itemStack = inventory[index];
if (itemStack == null) {
continue;
}
Item item = itemStack.getItem();
if (item instanceof ItemArmor) {
ItemArmor armor = (ItemArmor) item;
double reduction = armor.damageReduceAmount / 25D;
DamageObject object = new DamageObject();
object.slot = index;
object.ratio = reduction;
damageObjects.add(object);
}
}
boolean first = true;
double ratio = 0;
for (DamageObject prop : damageObjects) {
EquipmentType type = resolveEquipment(prop.slot);
final DamageObject object = new DamageObject();
object.ratio = ratio;
if (first) {
object.previousDamage = damage;
object.augment = true;
}
Function<? super Double, Double> function =
incomingDamage -> {
incomingDamage *= 25;
if (object.augment) {
// This is the damage that needs to be archived for the "first" armor modifier
// function since the armor modifiers work based on the initial damage and not as
// a chain one after another.
damageToHandle = incomingDamage;
}
double functionDamage = damageToHandle;
object.previousDamage = functionDamage;
object.ratio = prop.ratio;
object.ratio += prop.ratio;
return -((functionDamage * prop.ratio) / 25);
};
ratio += prop.ratio;
DamageModifier modifier =
DamageModifier.builder()
.cause(
Cause.of(
NamedCause.of(
DamageEntityEvent.GENERAL_ARMOR + ":" + type.getId(),
((org.spongepowered.api.item.inventory.ItemStack) inventory[prop.slot])
.createSnapshot()),
NamedCause.of(
"ArmorProperty", prop), // We need this property to refer to the slot.
NamedCause.of("0xDEADBEEF", object))) // We need this object later on.
.type(DamageModifierTypes.ARMOR)
.build();
modifiers.add(new Tuple<>(modifier, function));
first = false;
}
if (modifiers.isEmpty()) {
return Optional.empty();
} else {
return Optional.of(modifiers);
}
}
return Optional.empty();
}