Package net.fabricmc.fabric.api.transfer.v1.storage.base

Class SingleVariantItemStorage<T extends TransferVariant<?>>

java.lang.Object

net.fabricmc.fabric.api.transfer.v1.storage.base.SingleVariantItemStorage<T>

Type Parameters:

T - The type of the stored transfer variant. Experimental feature, we reserve the right to remove or change it without further notice. The transfer API is a complex addition, and we want to be able to correct possible design mistakes.

All Implemented Interfaces:

SingleSlotStorage<T>, Storage<T>, StorageView<T>

@Experimental
public abstract class SingleVariantItemStorage<T extends TransferVariant<?>>
extends Object
implements SingleSlotStorage<T>

Base implementation of a fixed-capacity "continuous" storage for item-provided storage APIs. The item may not change, so the data has to be stored in the NBT of the stacks. This can be used for example to implement portable fluid tanks, fluid-containing jetpacks, and so on... Continuous here means that they can store any integer amount between 0 and the capacity, unlike buckets or bottles.

To expose the storage API for an item, you need to register a provider for your item, and pass it an instance of this class:

• You must override getBlankResource(), for example return FluidVariant.blank(); for fluids.
• You must override getResource(ItemVariant) and getAmount(ItemVariant). Generally you will read the resource and the amount from the NBT of the item variant.
• You must override getCapacity(TransferVariant) to set the capacity of your storage.
• You must override getUpdatedVariant(net.fabricmc.fabric.api.transfer.v1.item.ItemVariant, T, long). It is used to change the resource and the amount of the item variant. Generally you will copy the NBT, modify it, and then create a new variant from that. Copying the NBT instead of recreating it from scratch is important to keep custom names or enchantments.
• You may also override canInsert(T) and canExtract(T) if you want to restrict insertion and/or extraction.

Constructor Summary

Constructors

Constructor	Description
SingleVariantItemStorage(ContainerItemContext context)

Method Summary

Modifier and Type	Method	Description
protected boolean	canExtract(T resource)	Return true if the passed non-blank variant can be extracted, false otherwise.
protected boolean	canInsert(T resource)	Return true if the passed non-blank variant can be inserted, false otherwise.
long	extract(T extractedResource, long maxAmount, TransactionContext transaction)	Try to extract up to some amount of a resource from this storage.
long	getAmount()
protected abstract long	getAmount(ItemVariant currentVariant)	Return the current amount by reading the NBT of the passed variant.
protected abstract T	getBlankResource()	Return the blank resource.
long	getCapacity()
protected abstract long	getCapacity(T variant)	Return the capacity of this storage for the passed resource.
T	getResource()
protected abstract T	getResource(ItemVariant currentVariant)	Return the current resource by reading the NBT of the passed variant.
protected abstract ItemVariant	getUpdatedVariant(ItemVariant currentVariant, T newResource, long newAmount)	Return an updated variant with new resource and amount.
long	insert(T insertedResource, long maxAmount, TransactionContext transaction)	Try to insert up to some amount of a resource into this storage.
boolean	isResourceBlank()	Return true if the StorageView.getResource() contained in this storage view is blank, or false otherwise.
boolean	supportsExtraction()	Return false if calling Storage.extract(T, long, net.fabricmc.fabric.api.transfer.v1.transaction.TransactionContext) will absolutely always return 0, or true otherwise or in doubt.
boolean	supportsInsertion()	Return false if calling Storage.insert(T, long, net.fabricmc.fabric.api.transfer.v1.transaction.TransactionContext) will absolutely always return 0, or true otherwise or in doubt.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface net.fabricmc.fabric.api.transfer.v1.storage.base.SingleSlotStorage

iterator

Methods inherited from interface net.fabricmc.fabric.api.transfer.v1.storage.Storage

exactView, getVersion, iterable, simulateExtract, simulateInsert

Constructor Details

SingleVariantItemStorage

public SingleVariantItemStorage(ContainerItemContext context)

Method Details

getBlankResource

protected abstract T getBlankResource()

Return the blank resource.

getResource

protected abstract T getResource(ItemVariant currentVariant)

Return the current resource by reading the NBT of the passed variant.

getAmount

protected abstract long getAmount(ItemVariant currentVariant)

Return the current amount by reading the NBT of the passed variant.

getCapacity

protected abstract long getCapacity(T variant)

Return the capacity of this storage for the passed resource. An estimate should be returned if the passed resource is blank.

getUpdatedVariant

protected abstract ItemVariant getUpdatedVariant(ItemVariant currentVariant,
 T newResource,
 long newAmount)

Return an updated variant with new resource and amount. Implementors should generally convert the passed currentVariant to a stack, then edit the NBT of the stack so it contains the correct resource and amount.

When the new amount is 0, it is recommended that the subtags corresponding to the resource and amount be removed, for example using ItemStack.removeSubNbt(java.lang.String), so that newly-crafted containers can stack with emptied containers.

Parameters:

currentVariant - Variant to which the modification should be applied.

newResource - Resource that should be contained in the returned variant.

newAmount - Amount that should be contained in the returned variant.

Returns:

A modified variant containing the new resource and amount.

canInsert

protected boolean canInsert(T resource)

Return true if the passed non-blank variant can be inserted, false otherwise.

canExtract

protected boolean canExtract(T resource)

Return true if the passed non-blank variant can be extracted, false otherwise.

supportsInsertion

public boolean supportsInsertion()

Description copied from interface: Storage

Return false if calling Storage.insert(T, long, net.fabricmc.fabric.api.transfer.v1.transaction.TransactionContext) will absolutely always return 0, or true otherwise or in doubt.

Note: This function is meant to be used by pipes or other devices that can transfer resources to know if they should interact with this storage at all.

Specified by:

supportsInsertion in interface Storage<T extends TransferVariant<?>>

insert

public long insert(T insertedResource,
 long maxAmount,
 TransactionContext transaction)

Description copied from interface: Storage

Try to insert up to some amount of a resource into this storage.

Specified by:

insert in interface Storage<T extends TransferVariant<?>>

Parameters:

insertedResource - The resource to insert. May not be blank.

maxAmount - The maximum amount of resource to insert. May not be negative.

transaction - The transaction this operation is part of.

Returns:

A nonnegative integer not greater than maxAmount: the amount that was inserted.

supportsExtraction

public boolean supportsExtraction()

Description copied from interface: Storage

Return false if calling Storage.extract(T, long, net.fabricmc.fabric.api.transfer.v1.transaction.TransactionContext) will absolutely always return 0, or true otherwise or in doubt.

Note: This function is meant to be used by pipes or other devices that can transfer resources to know if they should interact with this storage at all.

Specified by:

supportsExtraction in interface Storage<T extends TransferVariant<?>>

extract

public long extract(T extractedResource,
 long maxAmount,
 TransactionContext transaction)

Description copied from interface: Storage

Try to extract up to some amount of a resource from this storage.

Specified by:

extract in interface Storage<T extends TransferVariant<?>>

Specified by:

extract in interface StorageView<T extends TransferVariant<?>>

Parameters:

extractedResource - The resource to extract. May not be blank.

maxAmount - The maximum amount of resource to extract. May not be negative.

transaction - The transaction this operation is part of.

Returns:

A nonnegative integer not greater than maxAmount: the amount that was extracted.

isResourceBlank

public boolean isResourceBlank()

Description copied from interface: StorageView

Return true if the StorageView.getResource() contained in this storage view is blank, or false otherwise.

This function is mostly useful when dealing with storages of arbitrary types. For transfer variant storages, this should always be equivalent to getResource().isBlank().

Specified by:

isResourceBlank in interface StorageView<T extends TransferVariant<?>>

getResource

public T getResource()

Specified by:

getResource in interface StorageView<T extends TransferVariant<?>>

Returns:

The resource stored in this view. May not be blank if StorageView.isResourceBlank() is false.

getAmount

public long getAmount()

Specified by:

getAmount in interface StorageView<T extends TransferVariant<?>>

Returns:

The amount of StorageView.getResource() stored in this view.

getCapacity

public long getCapacity()

Specified by:

getCapacity in interface StorageView<T extends TransferVariant<?>>

Returns:

The total amount of StorageView.getResource() that could be stored in this view, or an estimate of the number of resources that could be stored if this view has a blank resource.