Ability Core

Just like Items and Blocks in minecraft all abilities exist only once, that is an AbilityCore. An IAbility object thus represents specific information that each ability can have, while the important, immutable information of the ability (such as name, description, unlock requirements etc) are stored within the AbilityCore and applied to all abilities of that type.

They are created at startup and are registered in a specific AbilityCore registry found at ModRegistries, specifically here we're talking about ModRegistries.ABILITIES.

AbilityCores are created via a builder class found inside of them (AbilityCore.Builder) and allows devs to customize an ability's information while also providing some defaults.

A minimal example of an ability core would look like this:

public static final RegistryObject<AbilityCore<TestAbility>> INSTANCE = ABILITIES_REGISTER.register(new AbilityCore.Builder<>("Test", AbilityCategory.DEVIL_FRUITS, TestAbility::new).build());

Mandatory properties

Mandatory for all AbilityCores are 3 things:

• a name
• an AbilityCategory
• and an AbilityCore.IFactory used to create the ability

The name is self explanatory, this should be the default english localized name, such as Hiken

The AbilityCategory is the category which this ability is part of, this is used only for filtering and for the ability selection menu sorting them in tabs. Possible values are:

• DEVIL_FRUIT
• RACIAL
• STYLE
• HAKI
• FACTION
• EQUIPMENT

The AbilityCore.IFactory factory is a standard java factory pattern taking in an AbilityCore<A extends IAbility> and outputting A, a generic ability. In practice, as long as the default constructor for abilities (offered by Ability or PassiveAbility) is kept the factory needed will purely be a ::new call.

Optional properties

There are also a bunch of optional properties an AbilityCore can have, such as:

• AbilityType - active vs passive abilities, used in menus to separate them as well as for filtering abilities
  • default: AbilityType.Action (abilities that manually need activation)
• SourceHakiNature - the kind of haki that should affect this ability
  • default: SourceHakiNature.UNKNOWN (not affected by haki at all)
  • more info
• SourceType - a list of types that this ability has
  • default: SourceType.UNKNOWN (no type)
  • more info
• SourceElement - element of the ability
  • default: SourceElement.NONE (no elemental affinity)
  • more info
• AbilityCore.ICanUnlock - functional interface that determines if a player can unlock this ability, checked on multiple occasions. They are similar with predicates however they take a LivingEntity (the entity trying to unlock this ability) and return a boolean which is the result of this attempt (true if it can unlock it, false if they can't)
  • default: null (has no natural way of obtaining it)
• hidden - a property determining if the ability should be visible for the player, such as in menus
  • default: false (visible in menus)
• phantom key - a ResourceLocation used as a fake registry key for an ability, used when needing to display bonuses or information as abilities without them actually being registered abilities, used for information or display purposes
  • default: null (not needed)
• icon - used to set an icon for the ability
  • note that while this is not mandatory it is recommended to set one manually, there is a fallback here trying to get the ability icon based on the path used by Mine Mine no Mi if no icon is found. (Example if mod example adds a new ability named ability but forgets to assign an icon, the system will try to find an icon at path assets/example/textures/abilities/ability.png)
• description - used for the description tooltips of the ability
  • default: empty description