content: package net.minecraft.inventory;
  
  import net.minecraft.entity.IMerchant;
  import net.minecraft.entity.player.EntityPlayer;
  import net.minecraft.entity.player.InventoryPlayer;
  import net.minecraft.item.ItemStack;
  import net.minecraft.world.World;
  
  public class ContainerMerchant extends Container {
      private final IMerchant theMerchant;
      private final InventoryMerchant merchantInventory;
      private final World theWorld;
  
      public ContainerMerchant(InventoryPlayer playerInventory, IMerchant merchant, World worldIn) {
          this.theMerchant = merchant;
          this.theWorld = worldIn;
          this.merchantInventory = new InventoryMerchant(playerInventory.player, merchant);
          this.addSlotToContainer(new Slot(this.merchantInventory, 0, 36, 53));
          this.addSlotToContainer(new Slot(this.merchantInventory, 1, 62, 53));
          this.addSlotToContainer(new SlotMerchantResult(playerInventory.player, merchant, this.merchantInventory, 2, 120, 53));
  
          for (int i = 0; i < 3; ++i) {
              for (int j = 0; j < 9; ++j) {
                  this.addSlotToContainer(new Slot(playerInventory, j + i * 9 + 9, 8 + j * 18, 84 + i * 18));
              }
          }
  
          for (int k = 0; k < 9; ++k) {
              this.addSlotToContainer(new Slot(playerInventory, k, 8 + k * 18, 142));
          }
      }
  
      public InventoryMerchant getMerchantInventory() {
          return this.merchantInventory;
      }
  
      public void onCraftGuiOpened(ICrafting listener) {
          super.onCraftGuiOpened(listener);
      }
  
      public void detectAndSendChanges() {
          super.detectAndSendChanges();
      }
  
      public void onCraftMatrixChanged(IInventory inventoryIn) {
          this.merchantInventory.resetRecipeAndSlots();
          super.onCraftMatrixChanged(inventoryIn);
      }
  
      public void setCurrentRecipeIndex(int currentRecipeIndex) {
          this.merchantInventory.setCurrentRecipeIndex(currentRecipeIndex);
      }
  
      public void updateProgressBar(int id, int data) {
      }
  
      public boolean canInteractWith(EntityPlayer playerIn) {
          return this.theMerchant.getCustomer() == playerIn;
      }
  
      public ItemStack transferStackInSlot(EntityPlayer playerIn, int index) {
          ItemStack itemstack = null;
          Slot slot = this.inventorySlots.get(index);
  
          if (slot != null && slot.getHasStack()) {
              ItemStack itemstack1 = slot.getStack();
              itemstack = itemstack1.copy();
  
              if (index == 2) {
                  if (!this.mergeItemStack(itemstack1, 3, 39, true)) {
                      return null;
                  }
  
                  slot.onSlotChange(itemstack1, itemstack);
              } else if (index != 0 && index != 1) {
                  if (index >= 3 && index < 30) {
                      if (!this.mergeItemStack(itemstack1, 30, 39, false)) {
                          return null;
                      }
                  } else if (index >= 30 && index < 39 && !this.mergeItemStack(itemstack1, 3, 30, false)) {
                      return null;
                  }
              } else if (!this.mergeItemStack(itemstack1, 3, 39, false)) {
                  return null;
              }
  
              if (itemstack1.stackSize == 0) {
                  slot.putStack(null);
              } else {
                  slot.onSlotChanged();
              }
  
              if (itemstack1.stackSize == itemstack.stackSize) {
                  return null;
              }
  
              slot.onPickupFromSlot(playerIn, itemstack1);
          }
  
          return itemstack;
      }
  
      public void onContainerClosed(EntityPlayer playerIn) {
          super.onContainerClosed(playerIn);
          this.theMerchant.setCustomer(null);
          super.onContainerClosed(playerIn);
  
          if (!this.theWorld.isRemote) {
              ItemStack itemstack = this.merchantInventory.removeStackFromSlot(0);
  
              if (itemstack != null) {
                  playerIn.dropPlayerItemWithRandomChoice(itemstack, false);
              }
  
              itemstack = this.merchantInventory.removeStackFromSlot(1);
  
              if (itemstack != null) {
                  playerIn.dropPlayerItemWithRandomChoice(itemstack, false);
              }
          }
      }
  }
  