    001package net.minecraft.inventory;
    002
    003import net.minecraft.entity.IMerchant;
    004import net.minecraft.entity.player.EntityPlayer;
    005import net.minecraft.item.ItemStack;
    006import net.minecraft.village.MerchantRecipe;
    007import net.minecraft.village.MerchantRecipeList;
    008
    009public class InventoryMerchant implements IInventory
    010{
    011    private final IMerchant theMerchant;
    012    private ItemStack[] theInventory = new ItemStack[3];
    013    private final EntityPlayer thePlayer;
    014    private MerchantRecipe currentRecipe;
    015    private int currentRecipeIndex;
    016
    017    public InventoryMerchant(EntityPlayer par1EntityPlayer, IMerchant par2IMerchant)
    018    {
    019        this.thePlayer = par1EntityPlayer;
    020        this.theMerchant = par2IMerchant;
    021    }
    022
    023    /**
    024     * Returns the number of slots in the inventory.
    025     */
    026    public int getSizeInventory()
    027    {
    028        return this.theInventory.length;
    029    }
    030
    031    /**
    032     * Returns the stack in slot i
    033     */
    034    public ItemStack getStackInSlot(int par1)
    035    {
    036        return this.theInventory[par1];
    037    }
    038
    039    /**
    040     * Removes from an inventory slot (first arg) up to a specified number (second arg) of items and returns them in a
    041     * new stack.
    042     */
    043    public ItemStack decrStackSize(int par1, int par2)
    044    {
    045        if (this.theInventory[par1] != null)
    046        {
    047            ItemStack itemstack;
    048
    049            if (par1 == 2)
    050            {
    051                itemstack = this.theInventory[par1];
    052                this.theInventory[par1] = null;
    053                return itemstack;
    054            }
    055            else if (this.theInventory[par1].stackSize <= par2)
    056            {
    057                itemstack = this.theInventory[par1];
    058                this.theInventory[par1] = null;
    059
    060                if (this.inventoryResetNeededOnSlotChange(par1))
    061                {
    062                    this.resetRecipeAndSlots();
    063                }
    064
    065                return itemstack;
    066            }
    067            else
    068            {
    069                itemstack = this.theInventory[par1].splitStack(par2);
    070
    071                if (this.theInventory[par1].stackSize == 0)
    072                {
    073                    this.theInventory[par1] = null;
    074                }
    075
    076                if (this.inventoryResetNeededOnSlotChange(par1))
    077                {
    078                    this.resetRecipeAndSlots();
    079                }
    080
    081                return itemstack;
    082            }
    083        }
    084        else
    085        {
    086            return null;
    087        }
    088    }
    089
    090    /**
    091     * if par1 slot has changed, does resetRecipeAndSlots need to be called?
    092     */
    093    private boolean inventoryResetNeededOnSlotChange(int par1)
    094    {
    095        return par1 == 0 || par1 == 1;
    096    }
    097
    098    /**
    099     * When some containers are closed they call this on each slot, then drop whatever it returns as an EntityItem -
    100     * like when you close a workbench GUI.
    101     */
    102    public ItemStack getStackInSlotOnClosing(int par1)
    103    {
    104        if (this.theInventory[par1] != null)
    105        {
    106            ItemStack itemstack = this.theInventory[par1];
    107            this.theInventory[par1] = null;
    108            return itemstack;
    109        }
    110        else
    111        {
    112            return null;
    113        }
    114    }
    115
    116    /**
    117     * Sets the given item stack to the specified slot in the inventory (can be crafting or armor sections).
    118     */
    119    public void setInventorySlotContents(int par1, ItemStack par2ItemStack)
    120    {
    121        this.theInventory[par1] = par2ItemStack;
    122
    123        if (par2ItemStack != null && par2ItemStack.stackSize > this.getInventoryStackLimit())
    124        {
    125            par2ItemStack.stackSize = this.getInventoryStackLimit();
    126        }
    127
    128        if (this.inventoryResetNeededOnSlotChange(par1))
    129        {
    130            this.resetRecipeAndSlots();
    131        }
    132    }
    133
    134    /**
    135     * Returns the name of the inventory.
    136     */
    137    public String getInvName()
    138    {
    139        return "mob.villager";
    140    }
    141
    142    public boolean func_94042_c()
    143    {
    144        return false;
    145    }
    146
    147    /**
    148     * Returns the maximum stack size for a inventory slot. Seems to always be 64, possibly will be extended. *Isn't
    149     * this more of a set than a get?*
    150     */
    151    public int getInventoryStackLimit()
    152    {
    153        return 64;
    154    }
    155
    156    /**
    157     * Do not make give this method the name canInteractWith because it clashes with Container
    158     */
    159    public boolean isUseableByPlayer(EntityPlayer par1EntityPlayer)
    160    {
    161        return this.theMerchant.getCustomer() == par1EntityPlayer;
    162    }
    163
    164    public void openChest() {}
    165
    166    public void closeChest() {}
    167
    168    public boolean func_94041_b(int par1, ItemStack par2ItemStack)
    169    {
    170        return true;
    171    }
    172
    173    /**
    174     * Called when an the contents of an Inventory change, usually
    175     */
    176    public void onInventoryChanged()
    177    {
    178        this.resetRecipeAndSlots();
    179    }
    180
    181    public void resetRecipeAndSlots()
    182    {
    183        this.currentRecipe = null;
    184        ItemStack itemstack = this.theInventory[0];
    185        ItemStack itemstack1 = this.theInventory[1];
    186
    187        if (itemstack == null)
    188        {
    189            itemstack = itemstack1;
    190            itemstack1 = null;
    191        }
    192
    193        if (itemstack == null)
    194        {
    195            this.setInventorySlotContents(2, (ItemStack)null);
    196        }
    197        else
    198        {
    199            MerchantRecipeList merchantrecipelist = this.theMerchant.getRecipes(this.thePlayer);
    200
    201            if (merchantrecipelist != null)
    202            {
    203                MerchantRecipe merchantrecipe = merchantrecipelist.canRecipeBeUsed(itemstack, itemstack1, this.currentRecipeIndex);
    204
    205                if (merchantrecipe != null && !merchantrecipe.func_82784_g())
    206                {
    207                    this.currentRecipe = merchantrecipe;
    208                    this.setInventorySlotContents(2, merchantrecipe.getItemToSell().copy());
    209                }
    210                else if (itemstack1 != null)
    211                {
    212                    merchantrecipe = merchantrecipelist.canRecipeBeUsed(itemstack1, itemstack, this.currentRecipeIndex);
    213
    214                    if (merchantrecipe != null && !merchantrecipe.func_82784_g())
    215                    {
    216                        this.currentRecipe = merchantrecipe;
    217                        this.setInventorySlotContents(2, merchantrecipe.getItemToSell().copy());
    218                    }
    219                    else
    220                    {
    221                        this.setInventorySlotContents(2, (ItemStack)null);
    222                    }
    223                }
    224                else
    225                {
    226                    this.setInventorySlotContents(2, (ItemStack)null);
    227                }
    228            }
    229        }
    230    }
    231
    232    public MerchantRecipe getCurrentRecipe()
    233    {
    234        return this.currentRecipe;
    235    }
    236
    237    public void setCurrentRecipeIndex(int par1)
    238    {
    239        this.currentRecipeIndex = par1;
    240        this.resetRecipeAndSlots();
    241    }
    242}