Tile

package com.arucraft.tileentity;

import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.init.Items;
import net.minecraft.inventory.IInventory;
import net.minecraft.item.Item;
import net.minecraft.item.ItemStack;
import net.minecraft.nbt.NBTTagCompound;
import net.minecraft.nbt.NBTTagList;
import net.minecraft.tileentity.TileEntity;

public class TileEntityAlloyOven extends TileEntity implements IInventory {

    private ItemStack slots[];

    public int triplePower;
    public int tripleCookTime;

    private String customName;

    public TileEntityAlloyOven() {
        slots = new ItemStack[5];
    }

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

    @Override
    public ItemStack getStackInSlot(int i) {
        return slots[i];
    }

    @Override
    public ItemStack decrStackSize(int i, int j) {
        if (slots[i] != null) {
            if (slots[i].stackSize <= j) {
                ItemStack itemstack = slots[i];
                slots[i] = null;
                return itemstack;
            }
            ItemStack itemstack1 = slots[i].splitStack(j);

            if (slots[i].stackSize == 0) {
                slots[i] = null;
            }

            return itemstack1;
        }else{
            return null;
        }
    }

    public void readFromNBT (NBTTagCompound nbt) {
        super.readFromNBT(nbt);
        NBTTagList list = nbt.getTagList("Items", 10);
        slots = new ItemStack[getSizeInventory()];

        for (int i = 0; i < list.tagCount(); i++) {
            NBTTagCompound nbt1 = (NBTTagCompound)list.getCompoundTagAt(i);
            byte b0 = nbt1.getByte("Slot");

            if (b0 >= 0 && b0 < slots.length) {
                slots[b0] = ItemStack.loadItemStackFromNBT(nbt1);
            }
        }

        triplePower = nbt.getShort("PowerTime");
        tripleCookTime = nbt.getShort("CookTime");
    }

    public void writeToNBT(NBTTagCompound nbt) {
        super.writeToNBT(nbt);
        nbt.setShort("PowerTime", (short)triplePower);
        nbt.setShort("CookTime", (short)tripleCookTime);
        NBTTagList list = new NBTTagList();

        for (int i = 0; i < slots.length; i++) {
            if (slots[i] != null) {
                NBTTagCompound nbt1 = new NBTTagCompound();
                nbt1.setByte("Slot", (byte)i);
                slots[i].writeToNBT(nbt1);
                list.appendTag(nbt1);
            }
        }

        nbt.setTag("Items", list);

    }



    @Override
    public ItemStack getStackInSlotOnClosing(int i) {
        if (slots[i] != null) {
            ItemStack itemstack = slots[i];
            slots[i] = null;
            return itemstack;
        }else{
            return null;
        }
    }

    @Override
    public void setInventorySlotContents(int i, ItemStack itemstack) {
        slots[i] = itemstack;
        if (itemstack != null && itemstack.stackSize > getInventoryStackLimit()) {
            itemstack.stackSize = getInventoryStackLimit();
        }
    }

    @Override
    public String getInventoryName() {
        return this.hasCustomInventoryName() ? this.customName : "container.alloyoven";
    }

    @Override
    public boolean hasCustomInventoryName() {
        return this.customName != null && this.customName.length() > 0;
    }

    @Override
    public int getInventoryStackLimit() {
        return 64;
    }

    @Override
    public boolean isUseableByPlayer(EntityPlayer player) {
        if (worldObj.getTileEntity(xCoord, yCoord, zCoord) != this) {
            return false;
        }else{
            return player.getDistanceSq((double)xCoord + 0.5D, (double)yCoord + 0.5D, (double)zCoord + 0.5D) <= 64;
        }
    }

    public void openInventory() {}
    public void closeInventory() {}

    @Override
    public boolean isItemValidForSlot(int i, ItemStack itemstack) {
        return i == 3 ? false : (i == 1 ? hasItemPower(itemstack) : true);
    }

    public boolean hasItemPower(ItemStack itemstack) {
        return getItemPower(itemstack) > 0;
    }

    private static int getItemPower (ItemStack itemstack) {
        if (itemstack == null) {
            return 0;
        }else{
            Item item = itemstack.getItem();

            if (item == Items.coal) return 50;

            return 0;
        }
    }

}