DummyCraftingGrid.java

package crazypants.enderio.machine.crafter;

import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.inventory.IInventory;
import net.minecraft.item.ItemStack;
import net.minecraft.nbt.NBTTagCompound;
import net.minecraft.nbt.NBTTagList;

public class DummyCraftingGrid implements IInventory {

  ItemStack[] inv = new ItemStack[10];

  public boolean hasValidRecipe() {
    return getOutput() != null;
  }
  
  public ItemStack getOutput() {
    return inv[9];    
  }

  @Override
  public int getSizeInventory() {
    return inv.length;
  }

  @Override
  public ItemStack getStackInSlot(int var1) {
    if(var1 < 0 || var1 >= inv.length) {
      return null;
    }
    return inv[var1];
  }

  @Override
  public ItemStack decrStackSize(int fromSlot, int amount) {
    ItemStack item = inv[fromSlot];
    inv[fromSlot] = null;
    if(item == null) {
      return null;
    }
    item.stackSize = 0;
    return item;
  }

  @Override
  public ItemStack getStackInSlotOnClosing(int var1) {
    return null;
  }

  @Override
  public void setInventorySlotContents(int i, ItemStack itemstack) {
    if(itemstack != null) {
      inv[i] = itemstack.copy();
      if(i < 9) {
        inv[i].stackSize = 0;
      }
    } else {
      inv[i] = null;
    }

  }

  @Override
  public String getInventoryName() {
    return "CraftingGrid";
  }

  @Override
  public boolean hasCustomInventoryName() {
    return false;
  }

  @Override
  public int getInventoryStackLimit() {
    return 0;
  }

  @Override
  public void markDirty() {
  }

  @Override
  public boolean isUseableByPlayer(EntityPlayer var1) {
    return true;
  }

  @Override
  public void openInventory() {
  }

  @Override
  public void closeInventory() {
  }

  @Override
  public boolean isItemValidForSlot(int var1, ItemStack var2) {
    return var1 < 9;
  }

  public void readFromNBT(NBTTagCompound nbtRoot) {
    NBTTagList itemList = (NBTTagList) nbtRoot.getTag("Items");
    if(itemList == null) {
      for (int i = 0; i < inv.length; i++) {
        inv[i] = null;
      }
      return;
    }
    for (int i = 0; i < itemList.tagCount(); i++) {
      NBTTagCompound itemStack = itemList.getCompoundTagAt(i);
      byte slot = itemStack.getByte("Slot");
      if(slot >= 0 && slot < inv.length) {
        inv[slot] = ItemStack.loadItemStackFromNBT(itemStack);
      }
    }
  }

  public void writeToNBT(NBTTagCompound nbtRoot) {
    NBTTagList itemList = new NBTTagList();
    for (int i = 0; i < inv.length; i++) {
      if(inv[i] != null) {
        NBTTagCompound itemStackNBT = new NBTTagCompound();
        itemStackNBT.setByte("Slot", (byte) i);
        inv[i].writeToNBT(itemStackNBT);
        itemList.appendTag(itemStackNBT);
      }
    }
    nbtRoot.setTag("Items", itemList);
  }

}