content: package net.minecraft.inventory;
  
  import net.minecraft.entity.player.EntityPlayer;
  import net.minecraft.item.ItemStack;
  
  public class ContainerChest extends Container {
      private final IInventory lowerChestInventory;
      private final int numRows;
  
      public ContainerChest(IInventory playerInventory, IInventory chestInventory, EntityPlayer player) {
          this.lowerChestInventory = chestInventory;
          this.numRows = chestInventory.getSizeInventory() / 9;
          chestInventory.openInventory(player);
          int i = (this.numRows - 4) * 18;
  
          for (int j = 0; j < this.numRows; ++j) {
              for (int k = 0; k < 9; ++k) {
                  this.addSlotToContainer(new Slot(chestInventory, k + j * 9, 8 + k * 18, 18 + j * 18));
              }
          }
  
          for (int l = 0; l < 3; ++l) {
              for (int j1 = 0; j1 < 9; ++j1) {
                  this.addSlotToContainer(new Slot(playerInventory, j1 + l * 9 + 9, 8 + j1 * 18, 103 + l * 18 + i));
              }
          }
  
          for (int i1 = 0; i1 < 9; ++i1) {
              this.addSlotToContainer(new Slot(playerInventory, i1, 8 + i1 * 18, 161 + i));
          }
      }
  
      public boolean canInteractWith(EntityPlayer playerIn) {
          return this.lowerChestInventory.isUseableByPlayer(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 < this.numRows * 9) {
                  if (!this.mergeItemStack(itemstack1, this.numRows * 9, this.inventorySlots.size(), true)) {
                      return null;
                  }
              } else if (!this.mergeItemStack(itemstack1, 0, this.numRows * 9, false)) {
                  return null;
              }
  
              if (itemstack1.stackSize == 0) {
                  slot.putStack(null);
              } else {
                  slot.onSlotChanged();
              }
          }
  
          return itemstack;
      }
  
      public void onContainerClosed(EntityPlayer playerIn) {
          super.onContainerClosed(playerIn);
          this.lowerChestInventory.closeInventory(playerIn);
      }
  
      public IInventory getLowerChestInventory() {
          return this.lowerChestInventory;
      }
  }
  