InventoryMerchant.java

package net.minecraft.inventory;

import net.minecraft.entity.IMerchant;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.item.ItemStack;
import net.minecraft.village.MerchantRecipe;
import net.minecraft.village.MerchantRecipeList;

public class InventoryMerchant implements IInventory
{
    private final IMerchant theMerchant;
    private ItemStack[] theInventory = new ItemStack[3];
    private final EntityPlayer thePlayer;
    private MerchantRecipe currentRecipe;
    private int currentRecipeIndex;
    private static final String __OBFID = "CL_00001756";

    public InventoryMerchant(EntityPlayer p_i1820_1_, IMerchant p_i1820_2_)
    {
        this.thePlayer = p_i1820_1_;
        this.theMerchant = p_i1820_2_;
    }

    /**
     * Returns the number of slots in the inventory.
     */
    public int getSizeInventory()
    {
        return this.theInventory.length;
    }

    /**
     * Returns the stack in slot i
     */
    public ItemStack getStackInSlot(int slotIn)
    {
        return this.theInventory[slotIn];
    }

    /**
     * Removes from an inventory slot (first arg) up to a specified number (second arg) of items and returns them in a
     * new stack.
     */
    public ItemStack decrStackSize(int index, int count)
    {
        if (this.theInventory[index] != null)
        {
            ItemStack itemstack;

            if (index == 2)
            {
                itemstack = this.theInventory[index];
                this.theInventory[index] = null;
                return itemstack;
            }
            else if (this.theInventory[index].stackSize <= count)
            {
                itemstack = this.theInventory[index];
                this.theInventory[index] = null;

                if (this.inventoryResetNeededOnSlotChange(index))
                {
                    this.resetRecipeAndSlots();
                }

                return itemstack;
            }
            else
            {
                itemstack = this.theInventory[index].splitStack(count);

                if (this.theInventory[index].stackSize == 0)
                {
                    this.theInventory[index] = null;
                }

                if (this.inventoryResetNeededOnSlotChange(index))
                {
                    this.resetRecipeAndSlots();
                }

                return itemstack;
            }
        }
        else
        {
            return null;
        }
    }

    /**
     * if par1 slot has changed, does resetRecipeAndSlots need to be called?
     */
    private boolean inventoryResetNeededOnSlotChange(int p_70469_1_)
    {
        return p_70469_1_ == 0 || p_70469_1_ == 1;
    }

    /**
     * When some containers are closed they call this on each slot, then drop whatever it returns as an EntityItem -
     * like when you close a workbench GUI.
     */
    public ItemStack getStackInSlotOnClosing(int index)
    {
        if (this.theInventory[index] != null)
        {
            ItemStack itemstack = this.theInventory[index];
            this.theInventory[index] = null;
            return itemstack;
        }
        else
        {
            return null;
        }
    }

    /**
     * Sets the given item stack to the specified slot in the inventory (can be crafting or armor sections).
     */
    public void setInventorySlotContents(int index, ItemStack stack)
    {
        this.theInventory[index] = stack;

        if (stack != null && stack.stackSize > this.getInventoryStackLimit())
        {
            stack.stackSize = this.getInventoryStackLimit();
        }

        if (this.inventoryResetNeededOnSlotChange(index))
        {
            this.resetRecipeAndSlots();
        }
    }

    /**
     * Returns the name of the inventory
     */
    public String getInventoryName()
    {
        return "mob.villager";
    }

    /**
     * Returns if the inventory is named
     */
    public boolean isCustomInventoryName()
    {
        return false;
    }

    /**
     * Returns the maximum stack size for a inventory slot. Seems to always be 64, possibly will be extended. *Isn't
     * this more of a set than a get?*
     */
    public int getInventoryStackLimit()
    {
        return 64;
    }

    /**
     * Do not make give this method the name canInteractWith because it clashes with Container
     */
    public boolean isUseableByPlayer(EntityPlayer player)
    {
        return this.theMerchant.getCustomer() == player;
    }

    public void openChest() {}

    public void closeChest() {}

    /**
     * Returns true if automation is allowed to insert the given stack (ignoring stack size) into the given slot.
     */
    public boolean isItemValidForSlot(int index, ItemStack stack)
    {
        return true;
    }

    /**
     * For tile entities, ensures the chunk containing the tile entity is saved to disk later - the game won't think it
     * hasn't changed and skip it.
     */
    public void markDirty()
    {
        this.resetRecipeAndSlots();
    }

    public void resetRecipeAndSlots()
    {
        this.currentRecipe = null;
        ItemStack itemstack = this.theInventory[0];
        ItemStack itemstack1 = this.theInventory[1];

        if (itemstack == null)
        {
            itemstack = itemstack1;
            itemstack1 = null;
        }

        if (itemstack == null)
        {
            this.setInventorySlotContents(2, (ItemStack)null);
        }
        else
        {
            MerchantRecipeList merchantrecipelist = this.theMerchant.getRecipes(this.thePlayer);

            if (merchantrecipelist != null)
            {
                MerchantRecipe merchantrecipe = merchantrecipelist.canRecipeBeUsed(itemstack, itemstack1, this.currentRecipeIndex);

                if (merchantrecipe != null && !merchantrecipe.isRecipeDisabled())
                {
                    this.currentRecipe = merchantrecipe;
                    this.setInventorySlotContents(2, merchantrecipe.getItemToSell().copy());
                }
                else if (itemstack1 != null)
                {
                    merchantrecipe = merchantrecipelist.canRecipeBeUsed(itemstack1, itemstack, this.currentRecipeIndex);

                    if (merchantrecipe != null && !merchantrecipe.isRecipeDisabled())
                    {
                        this.currentRecipe = merchantrecipe;
                        this.setInventorySlotContents(2, merchantrecipe.getItemToSell().copy());
                    }
                    else
                    {
                        this.setInventorySlotContents(2, (ItemStack)null);
                    }
                }
                else
                {
                    this.setInventorySlotContents(2, (ItemStack)null);
                }
            }
        }

        this.theMerchant.verifySellingItem(this.getStackInSlot(2));
    }

    public MerchantRecipe getCurrentRecipe()
    {
        return this.currentRecipe;
    }

    public void setCurrentRecipeIndex(int p_70471_1_)
    {
        this.currentRecipeIndex = p_70471_1_;
        this.resetRecipeAndSlots();
    }
}