net.minecraftforge.items.wrapper

Class EmptyHandler

java.lang.Object

net.minecraftforge.items.wrapper.EmptyHandler

All Implemented Interfaces:

IItemHandler, IItemHandlerModifiable

public class EmptyHandler
extends java.lang.Object
implements IItemHandlerModifiable

Field Summary

Fields

Modifier and Type	Field and Description
static IItemHandler	INSTANCE

Constructor Summary

Constructors

Constructor and Description
EmptyHandler()

Method Summary

Modifier and Type	Method and Description
ItemStack	extractItem(int slot, int amount, boolean simulate) Extracts an ItemStack from the given slot.
int	getSlotLimit(int slot) Retrieves the maximum stack size allowed to exist in the given slot.
int	getSlots() Returns the number of slots available
ItemStack	getStackInSlot(int slot) Returns the ItemStack in a given slot.
ItemStack	insertItem(int slot, ItemStack stack, boolean simulate) Inserts an ItemStack into the given slot and return the remainder.
boolean	isItemValid(int slot, ItemStack stack) This function re-implements the vanilla function IInventory.isItemValidForSlot(int, ItemStack).
void	setStackInSlot(int slot, ItemStack stack) Overrides the stack in the given slot.

Methods inherited from class java.lang.Object

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

Field Detail

INSTANCE

public static final IItemHandler INSTANCE

Constructor Detail

EmptyHandler

public EmptyHandler()

Method Detail

getSlots

public int getSlots()

Description copied from interface: IItemHandler

Returns the number of slots available

Specified by:

getSlots in interface IItemHandler

Returns:

The number of slots available

getStackInSlot

@Nonnull
public ItemStack getStackInSlot(int slot)

Description copied from interface: IItemHandler

Returns the ItemStack in a given slot. The result's stack size may be greater than the itemstack's max size. If the result is empty, then the slot is empty.

IMPORTANT: This ItemStack MUST NOT be modified. This method is not for altering an inventory's contents. Any implementers who are able to detect modification through this method should throw an exception.

SERIOUSLY: DO NOT MODIFY THE RETURNED ITEMSTACK

Specified by:

getStackInSlot in interface IItemHandler

Parameters:

slot - Slot to query

Returns:

ItemStack in given slot. Empty Itemstack if the slot is empty.

insertItem

@Nonnull
public ItemStack insertItem(int slot,
                                     @Nonnull
                                     ItemStack stack,
                                     boolean simulate)

Description copied from interface: IItemHandler

Inserts an ItemStack into the given slot and return the remainder. The ItemStack should not be modified in this function!

Note: This behaviour is subtly different from IFluidHandler#fill(FluidStack, boolean)

Specified by:

insertItem in interface IItemHandler

Parameters:

slot - Slot to insert into.

stack - ItemStack to insert. This must not be modified by the item handler.

simulate - If true, the insertion is only simulated

Returns:

The remaining ItemStack that was not inserted (if the entire stack is accepted, then return an empty ItemStack). May be the same as the input ItemStack if unchanged, otherwise a new ItemStack. The returned ItemStack can be safely modified after.

extractItem

@Nonnull
public ItemStack extractItem(int slot,
                                      int amount,
                                      boolean simulate)

Description copied from interface: IItemHandler

Extracts an ItemStack from the given slot.

The returned value must be empty if nothing is extracted, otherwise its stack size must be less than or equal to amount and ItemStack.getMaxStackSize().

Specified by:

extractItem in interface IItemHandler

Parameters:

slot - Slot to extract from.

amount - Amount to extract (may be greater than the current stack's max limit)

simulate - If true, the extraction is only simulated

Returns:

ItemStack extracted from the slot, must be empty if nothing can be extracted. The returned ItemStack can be safely modified after, so item handlers should return a new or copied stack.

setStackInSlot

public void setStackInSlot(int slot,
                           @Nonnull
                           ItemStack stack)

Description copied from interface: IItemHandlerModifiable

Overrides the stack in the given slot. This method is used by the standard Forge helper methods and classes. It is not intended for general use by other mods, and the handler may throw an error if it is called unexpectedly.

Specified by:

setStackInSlot in interface IItemHandlerModifiable

Parameters:

slot - Slot to modify

stack - ItemStack to set slot to (may be empty).

getSlotLimit

public int getSlotLimit(int slot)

Description copied from interface: IItemHandler

Retrieves the maximum stack size allowed to exist in the given slot.

Specified by:

getSlotLimit in interface IItemHandler

Parameters:

slot - Slot to query.

Returns:

The maximum stack size allowed in the slot.

isItemValid

public boolean isItemValid(int slot,
                           @Nonnull
                           ItemStack stack)

Description copied from interface: IItemHandler

This function re-implements the vanilla function IInventory.isItemValidForSlot(int, ItemStack). It should be used instead of simulated insertions in cases where the contents and state of the inventory are irrelevant, mainly for the purpose of automation and logic (for instance, testing if a minecart can wait to deposit its items into a full inventory, or if the items in the minecart can never be placed into the inventory and should move on).

• isItemValid is false when insertion of the item is never valid.
• When isItemValid is true, no assumptions can be made and insertion must be simulated case-by-case.
• The actual items in the inventory, its fullness, or any other state are not considered by isItemValid.

Specified by:

isItemValid in interface IItemHandler

Parameters:

slot - Slot to query for validity

stack - Stack to test with for validity

Returns:

true if the slot can insert the ItemStack, not considering the current state of the inventory. false if the slot can never insert the ItemStack in any situation.