SlotMerchantResult.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;

public class SlotMerchantResult extends Slot
{
    /** Merchant's inventory. */
    private final InventoryMerchant theMerchantInventory;
    /** The Player whos trying to buy/sell stuff. */
    private EntityPlayer thePlayer;
    private int field_75231_g;
    /** "Instance" of the Merchant. */
    private final IMerchant theMerchant;
    private static final String __OBFID = "CL_00001758";

    public SlotMerchantResult(EntityPlayer p_i1822_1_, IMerchant p_i1822_2_, InventoryMerchant p_i1822_3_, int p_i1822_4_, int p_i1822_5_, int p_i1822_6_)
    {
        super(p_i1822_3_, p_i1822_4_, p_i1822_5_, p_i1822_6_);
        this.thePlayer = p_i1822_1_;
        this.theMerchant = p_i1822_2_;
        this.theMerchantInventory = p_i1822_3_;
    }

    /**
     * Check if the stack is a valid item for this slot. Always true beside for the armor slots.
     */
    public boolean isItemValid(ItemStack stack)
    {
        return false;
    }

    /**
     * Decrease the size of the stack in slot (first int arg) by the amount of the second int arg. Returns the new
     * stack.
     */
    public ItemStack decrStackSize(int p_75209_1_)
    {
        if (this.getHasStack())
        {
            this.field_75231_g += Math.min(p_75209_1_, this.getStack().stackSize);
        }

        return super.decrStackSize(p_75209_1_);
    }

    /**
     * the itemStack passed in is the output - ie, iron ingots, and pickaxes, not ore and wood. Typically increases an
     * internal count then calls onCrafting(item).
     */
    protected void onCrafting(ItemStack p_75210_1_, int p_75210_2_)
    {
        this.field_75231_g += p_75210_2_;
        this.onCrafting(p_75210_1_);
    }

    /**
     * the itemStack passed in is the output - ie, iron ingots, and pickaxes, not ore and wood.
     */
    protected void onCrafting(ItemStack p_75208_1_)
    {
        p_75208_1_.onCrafting(this.thePlayer.worldObj, this.thePlayer, this.field_75231_g);
        this.field_75231_g = 0;
    }

    public void onPickupFromSlot(EntityPlayer p_82870_1_, ItemStack p_82870_2_)
    {
        this.onCrafting(p_82870_2_);
        MerchantRecipe merchantrecipe = this.theMerchantInventory.getCurrentRecipe();

        if (merchantrecipe != null)
        {
            ItemStack itemstack1 = this.theMerchantInventory.getStackInSlot(0);
            ItemStack itemstack2 = this.theMerchantInventory.getStackInSlot(1);

            if (this.doTrade(merchantrecipe, itemstack1, itemstack2) || this.doTrade(merchantrecipe, itemstack2, itemstack1))
            {
                this.theMerchant.useRecipe(merchantrecipe);

                if (itemstack1 != null && itemstack1.stackSize <= 0)
                {
                    itemstack1 = null;
                }

                if (itemstack2 != null && itemstack2.stackSize <= 0)
                {
                    itemstack2 = null;
                }

                this.theMerchantInventory.setInventorySlotContents(0, itemstack1);
                this.theMerchantInventory.setInventorySlotContents(1, itemstack2);
            }
        }
    }

    private boolean doTrade(MerchantRecipe trade, ItemStack firstItem, ItemStack secondItem)
    {
        ItemStack itemstack2 = trade.getItemToBuy();
        ItemStack itemstack3 = trade.getSecondItemToBuy();

        if (firstItem != null && firstItem.getItem() == itemstack2.getItem())
        {
            if (itemstack3 != null && secondItem != null && itemstack3.getItem() == secondItem.getItem())
            {
                firstItem.stackSize -= itemstack2.stackSize;
                secondItem.stackSize -= itemstack3.stackSize;
                return true;
            }

            if (itemstack3 == null && secondItem == null)
            {
                firstItem.stackSize -= itemstack2.stackSize;
                return true;
            }
        }

        return false;
    }
}