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Capability implemented in tile entity but returning null

HarryTechReviews

By HarryTechReviews
in Modder Support

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HarryTechReviews Stone Miner

HarryTechReviews

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I am using the item handler capability to create a custom furnace but although I have it implemented correctly (I think), the container reference to it returns null. Here's the code:

 

Tile Entity 

package harry.mods.tutorialmod.blocks.tileentity;

import harry.mods.tutorialmod.blocks.BlockElectricSinteringFurnace;
import harry.mods.tutorialmod.blocks.recipes.SinteringFurnaceRecipes;
import harry.mods.tutorialmod.energy.CustomEnergyStorage;
import harry.mods.tutorialmod.handlers.NBTHandler;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.item.ItemStack;
import net.minecraft.nbt.NBTTagCompound;
import net.minecraft.tileentity.TileEntity;
import net.minecraft.util.EnumFacing;
import net.minecraft.util.ITickable;
import net.minecraft.util.text.ITextComponent;
import net.minecraft.util.text.TextComponentString;
import net.minecraft.util.text.TextComponentTranslation;
import net.minecraftforge.common.capabilities.Capability;
import net.minecraftforge.common.capabilities.CapabilityInject;
import net.minecraftforge.energy.CapabilityEnergy;
import net.minecraftforge.energy.IEnergyStorage;
import net.minecraftforge.items.CapabilityItemHandler;
import net.minecraftforge.items.IItemHandler;
import net.minecraftforge.items.ItemStackHandler;

public class TileEntityElectricSinteringFurnace extends TileEntity implements ITickable
{	
	public CustomEnergyStorage storage;
	public ItemStackHandler handler;
	public int smeltingTime = 0, itemSmeltTime = 100;
	private ItemStack smelting;
	private String customName;
	
	public TileEntityElectricSinteringFurnace() 
	{
		this.storage = new CustomEnergyStorage(75000);
		this.handler = new ItemStackHandler(3);
	}
	
	@Override
	public ITextComponent getDisplayName() 
	{
		return hasCustomName() ? new TextComponentString(customName) : new TextComponentTranslation("container.electric_sintering_furnace");
	}
	
	public boolean hasCustomName()
	{
		return !this.customName.isEmpty() && this.customName != null;
	}
	
	
	private EnumFacing getFacing()
	{
		return world.getBlockState(pos).getValue(BlockElectricSinteringFurnace.FACING);
	}
	
	@Override
	public boolean hasCapability(Capability<?> capability, EnumFacing facing) 
	{
		if(capability == CapabilityItemHandler.ITEM_HANDLER_CAPABILITY) return true;
		if(capability == CapabilityEnergy.ENERGY) return true;
		return super.hasCapability(capability, facing);
	}
	
	@Override
	public <T> T getCapability(Capability<T> capability, EnumFacing facing) 
	{
		if(capability == CapabilityItemHandler.ITEM_HANDLER_CAPABILITY) return (T)this.handler;
		if(capability == CapabilityEnergy.ENERGY) return (T)this.storage;
		return super.getCapability(capability, facing);
	}
	
	@Override
	public void readFromNBT(NBTTagCompound compound)
	{
		compound.getInteger("smeltingTime");
		this.handler.deserializeNBT(compound.getCompoundTag("handler"));
		this.storage.readFromNBT(compound);
		smelting = NBTHandler.stackFromNBT((NBTTagCompound) compound.getTag("smelting"));
		super.readFromNBT(compound);
	}
	
	@Override
	public NBTTagCompound writeToNBT(NBTTagCompound compound) 
	{
		compound.setTag("handler", this.handler.serializeNBT());
		compound.setTag("smelting", NBTHandler.stackToNBT(smelting));
		compound.setInteger("smeltingTime", smeltingTime);
		this.storage.writeToNBT(compound);
		super.writeToNBT(compound);
		return compound;
	}
	
	@Override
	public void update()
	{
		ItemStack input1 = handler.getStackInSlot(0);
		ItemStack input2 = handler.getStackInSlot(1);
		
		if(world.isBlockPowered(pos)) storage.receiveEnergy(100, false);
		
		if(storage.getEnergyStored() >= 20)
		{
			if(smeltingTime > 0)
			{
				storage.extractEnergy(20, false);
				smeltingTime++;
				
				if(smeltingTime == itemSmeltTime)
				{
					handler.insertItem(2, smelting, false);
					smelting = null;
					smeltingTime = 0;
					return;
				}
			}
			else
			{
				if(!input1.isEmpty() && !input2.isEmpty())
				{
					SinteringFurnaceRecipes recipes = SinteringFurnaceRecipes.getInstance();
					ItemStack output = recipes.getSinteringResult(input1, input2);
					
					if(!output.isEmpty())
					{
						smelting = output;
						smeltingTime ++;
						input1.shrink(1);
						input2.shrink(1);
						handler.setStackInSlot(0, input1);
						handler.setStackInSlot(1, input2);
						storage.extractEnergy(20, false);
					}
				}
			}
		}	
	}
	
	public boolean isUsableByPlayer(EntityPlayer player) 
	{
		return this.world.getTileEntity(this.pos) != this ? false : player.getDistanceSq((double)this.pos.getX() + 0.5D, (double)this.pos.getY() + 0.5D, (double)this.pos.getZ() + 0.5D) <= 64.0D;
	}
}

 

Container 

public class ContainerElectricSinteringFurnace extends Container
{
	private final TileEntityElectricSinteringFurnace tileentity;
	
	public ContainerElectricSinteringFurnace(InventoryPlayer player, TileEntityElectricSinteringFurnace tileentity) 
	{
		this.tileentity = tileentity;
		IItemHandler handler = tileentity.getCapability(CapabilityItemHandler.ITEM_HANDLER_CAPABILITY, null);
		
		this.addSlotToContainer(new SlotItemHandler(handler, 0, 26, 11));
		this.addSlotToContainer(new SlotItemHandler(handler, 1, 26, 59));
		this.addSlotToContainer(new SlotElectricSinteringFurnaceOutput(handler, 3, 81, 36));
		
		for(int y = 0; y < 3; y++)
		{
			for(int x = 0; x < 9; x++)
			{
				this.addSlotToContainer(new Slot(player, x + y*9 + 9, 8 + x*18, 84 + y*18));
			}
		}
		
		for(int x = 0; x < 9; x++)
		{
			this.addSlotToContainer(new Slot(player, x, 8 + x * 18, 142));
		}
	}

 

Error log 

Caused by: java.lang.NullPointerException
	at harry.mods.tutorialmod.blocks.container.ContainerElectricSinteringFurnace.<init>(ContainerElectricSinteringFurnace.java:26) ~[ContainerElectricSinteringFurnace.class:?]
	at harry.mods.tutorialmod.handlers.GuiHandler.getServerGuiElement(GuiHandler.java:25) ~[GuiHandler.class:?]
	at net.minecraftforge.fml.common.network.NetworkRegistry.getRemoteGuiContainer(NetworkRegistry.java:253) ~[NetworkRegistry.class:?]
	at net.minecraftforge.fml.common.network.internal.FMLNetworkHandler.openGui(FMLNetworkHandler.java:88) ~[FMLNetworkHandler.class:?]
	at net.minecraft.entity.player.EntityPlayer.openGui(EntityPlayer.java:2809) ~[EntityPlayer.class:?]
	at harry.mods.tutorialmod.blocks.BlockElectricSinteringFurnace.onBlockActivated(BlockElectricSinteringFurnace.java:58) ~[BlockElectricSinteringFurnace.class:?]
	at net.minecraft.server.management.PlayerInteractionManager.processRightClickBlock(PlayerInteractionManager.java:472) ~[PlayerInteractionManager.class:?]
	at net.minecraft.network.NetHandlerPlayServer.processTryUseItemOnBlock(NetHandlerPlayServer.java:767) ~[NetHandlerPlayServer.class:?]
	at net.minecraft.network.play.client.CPacketPlayerTryUseItemOnBlock.processPacket(CPacketPlayerTryUseItemOnBlock.java:68) ~[CPacketPlayerTryUseItemOnBlock.class:?]
	at net.minecraft.network.play.client.CPacketPlayerTryUseItemOnBlock.processPacket(CPacketPlayerTryUseItemOnBlock.java:13) ~[CPacketPlayerTryUseItemOnBlock.class:?]
	at net.minecraft.network.PacketThreadUtil$1.run(PacketThreadUtil.java:21) ~[PacketThreadUtil$1.class:?]
	at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) ~[?:1.8.0_172]
	at java.util.concurrent.FutureTask.run(Unknown Source) ~[?:1.8.0_172]
	at net.minecraft.util.Util.runTask(Util.java:53) ~[Util.class:?]
	... 5 more

 

If you have any idea why this may return null, I would love to know. Thanks!

HarryTechReviews Stone Miner

HarryTechReviews

Posted
  • Author
Posted (edited)
  On 8/16/2018 at 3:49 PM, diesieben07 said:

From the code it is more likely that you are passing in null for the tileentity parameter of ContainerElectricSinteringFurnace.

Expand  

Oh my god ffs. You were right, I was using the local te instead of the global te variable. So frustrating. Thanks

Still doesn't work

Edited by HarryTechReviews
I hate my life
Draco18s Reality Controller

Draco18s

Posted
Posted
  On 8/16/2018 at 4:35 PM, HarryTechReviews said:

global te variable

Expand  

What.

Why do you have a global variable?

Apparently I'm a complete and utter jerk and come to this forum just like to make fun of people, be confrontational, and make your personal life miserable.  If you think this is the case, JUST REPORT ME.  Otherwise you're just going to get reported when you reply to my posts and point it out, because odds are, I was trying to be nice.

 

Exception: If you do not understand Java, I WILL NOT HELP YOU and your thread will get locked.

 

DO NOT PM ME WITH PROBLEMS. No help will be given.

Animefan8888 Reality Controller

Animefan8888

Posted
Posted
  On 8/16/2018 at 5:18 PM, HarryTechReviews said:

Might be wrong phrasing I don't know. Didnt work anyway

Expand  

Well post updated code, the new error report and which line it is crashing on.

VANILLA MINECRAFT CLASSES ARE THE BEST RESOURCES WHEN MODDING

I will be posting 1.15.2 modding tutorials on this channel. If you want to be notified of it do the normal YouTube stuff like subscribing, ect.

Forge and vanilla BlockState generator.

Draco18s Reality Controller

Draco18s

Posted
Posted

 

  On 8/16/2018 at 4:35 PM, HarryTechReviews said:
  On 8/16/2018 at 3:49 PM, diesieben07 said:

From the code it is more likely that you are passing in null for the tileentity parameter of ContainerElectricSinteringFurnace.

Expand  

Oh my god ffs. You were right, I was using the local te instead of the global te variable. So frustrating. Thanks

Expand  

You realize the thing you did doesn't fucking matter because you passed null to the constructor, right?

  On 8/16/2018 at 2:58 PM, HarryTechReviews said:

this.tileentity = tileentity;

IItemHandler handler = tileentity.getCapability(CapabilityItemHandler.ITEM_HANDLER_CAPABILITY, null);

Expand  

both this.tileentity and tileentity are null. Changing tileentity to this.tileentity on the second line doesn't change that fact.

Apparently I'm a complete and utter jerk and come to this forum just like to make fun of people, be confrontational, and make your personal life miserable.  If you think this is the case, JUST REPORT ME.  Otherwise you're just going to get reported when you reply to my posts and point it out, because odds are, I was trying to be nice.

 

Exception: If you do not understand Java, I WILL NOT HELP YOU and your thread will get locked.

 

DO NOT PM ME WITH PROBLEMS. No help will be given.

Animefan8888 Reality Controller

Animefan8888

Posted
Posted
  On 8/16/2018 at 2:58 PM, HarryTechReviews said:

IItemHandler handler = tileentity.getCapability(CapabilityItemHandler.ITEM_HANDLER_CAPABILITY, null);

Expand  

The only thing that could be causing a null pointer crash here would be "tileentity" you have to be passing null to the constructor.

VANILLA MINECRAFT CLASSES ARE THE BEST RESOURCES WHEN MODDING

I will be posting 1.15.2 modding tutorials on this channel. If you want to be notified of it do the normal YouTube stuff like subscribing, ect.

Forge and vanilla BlockState generator.

HarryTechReviews Stone Miner

HarryTechReviews

Posted
  • Author
Posted
  On 8/16/2018 at 5:35 PM, Animefan8888 said:

The only thing that could be causing a null pointer crash here would be "tileentity" you have to be passing null to the constructor.

Expand  

I'm not, here it is in gui handler.

        if(ID == Reference.GUI_ELECTRIC_SINTERING_FURNACE) return new ContainerElectricSinteringFurnace(player.inventory, (TileEntityElectricSinteringFurnace)world.getTileEntity(new BlockPos(x,y,z)));
  

		if(ID == Reference.GUI_ELECTRIC_SINTERING_FURNACE) return new ContainerElectricSinteringFurnace(player.inventory, (TileEntityElectricSinteringFurnace)world.getTileEntity(new BlockPos(x,y,z)));

 

Animefan8888 Reality Controller

Animefan8888

Posted
Posted
  On 8/16/2018 at 5:41 PM, HarryTechReviews said:

world.getTileEntity(new BlockPos(x,y,z)

Expand  

This can return null.

VANILLA MINECRAFT CLASSES ARE THE BEST RESOURCES WHEN MODDING

I will be posting 1.15.2 modding tutorials on this channel. If you want to be notified of it do the normal YouTube stuff like subscribing, ect.

Forge and vanilla BlockState generator.

Animefan8888 Reality Controller

Animefan8888

Posted
Posted
  On 8/16/2018 at 5:44 PM, HarryTechReviews said:

Same code for the other two gui and containers and they dont return null

Expand  

Is the TileEntity actually being placed down where the block is? Is the TileEntity registered?

VANILLA MINECRAFT CLASSES ARE THE BEST RESOURCES WHEN MODDING

I will be posting 1.15.2 modding tutorials on this channel. If you want to be notified of it do the normal YouTube stuff like subscribing, ect.

Forge and vanilla BlockState generator.

Animefan8888 Reality Controller

Animefan8888

Posted
Posted
  On 8/16/2018 at 6:44 PM, HarryTechReviews said:

Yep, all other tile entities are the same but this one doesn't work 

Expand  

Could you post your Block class and parent classes.

VANILLA MINECRAFT CLASSES ARE THE BEST RESOURCES WHEN MODDING

I will be posting 1.15.2 modding tutorials on this channel. If you want to be notified of it do the normal YouTube stuff like subscribing, ect.

Forge and vanilla BlockState generator.

HarryTechReviews Stone Miner

HarryTechReviews

Posted
  • Author
Posted
  On 8/16/2018 at 6:59 PM, Animefan8888 said:

Could you post your Block class and parent classes.

Expand  

 

Block Class 

package harry.mods.tutorialmod.blocks;

import java.util.Random;

import harry.mods.tutorialmod.Main;
import harry.mods.tutorialmod.Reference;
import harry.mods.tutorialmod.blocks.tileentity.TileEntitySinteringFurnace;
import harry.mods.tutorialmod.init.BlockInit;
import net.minecraft.block.BlockHorizontal;
import net.minecraft.block.SoundType;
import net.minecraft.block.material.Material;
import net.minecraft.block.properties.IProperty;
import net.minecraft.block.properties.PropertyBool;
import net.minecraft.block.properties.PropertyDirection;
import net.minecraft.block.state.BlockStateContainer;
import net.minecraft.block.state.IBlockState;
import net.minecraft.entity.EntityLivingBase;
import net.minecraft.entity.item.EntityItem;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.item.Item;
import net.minecraft.item.ItemStack;
import net.minecraft.tileentity.TileEntity;
import net.minecraft.util.EnumBlockRenderType;
import net.minecraft.util.EnumFacing;
import net.minecraft.util.EnumHand;
import net.minecraft.util.Mirror;
import net.minecraft.util.Rotation;
import net.minecraft.util.math.BlockPos;
import net.minecraft.world.World;

public class BlockElectricSinteringFurnace extends BlockBase 
{
	public static final PropertyDirection FACING = BlockHorizontal.FACING;
	public static final PropertyBool BURNING = PropertyBool.create("burning");
	
	public BlockElectricSinteringFurnace(String name) 
	{
		super(name, Material.IRON, Main.TUTORIAL);
		this.setDefaultState(this.blockState.getBaseState().withProperty(FACING, EnumFacing.NORTH).withProperty(BURNING, false));
	}
	
	@Override
	public Item getItemDropped(IBlockState state, Random rand, int fortune) 
	{
		return Item.getItemFromBlock(BlockInit.ELECTRIC_SINTERING_FURNACE);
	}
	
	@Override
	public ItemStack getItem(World worldIn, BlockPos pos, IBlockState state)
	{
		return new ItemStack(BlockInit.ELECTRIC_SINTERING_FURNACE);
	}
	
	@Override
	public boolean onBlockActivated(World worldIn, BlockPos pos, IBlockState state, EntityPlayer playerIn, EnumHand hand, EnumFacing facing, float hitX, float hitY, float hitZ) 
	{
		if(!worldIn.isRemote)
		{
			playerIn.openGui(Main.instance, Reference.GUI_ELECTRIC_SINTERING_FURNACE, worldIn, pos.getX(), pos.getY(), pos.getZ());
		}
		
		return true;
	}
	
	@Override
	public void onBlockAdded(World worldIn, BlockPos pos, IBlockState state) 
	{
		if (!worldIn.isRemote) 
        {
            IBlockState north = worldIn.getBlockState(pos.north());
            IBlockState south = worldIn.getBlockState(pos.south());
            IBlockState west = worldIn.getBlockState(pos.west());
            IBlockState east = worldIn.getBlockState(pos.east());
            EnumFacing face = (EnumFacing)state.getValue(FACING);

            if (face == EnumFacing.NORTH && north.isFullBlock() && !south.isFullBlock()) face = EnumFacing.SOUTH;
            else if (face == EnumFacing.SOUTH && south.isFullBlock() && !north.isFullBlock()) face = EnumFacing.NORTH;
            else if (face == EnumFacing.WEST && west.isFullBlock() && !east.isFullBlock()) face = EnumFacing.EAST;
            else if (face == EnumFacing.EAST && east.isFullBlock() && !west.isFullBlock()) face = EnumFacing.WEST;
            worldIn.setBlockState(pos, state.withProperty(FACING, face), 2);
        }
	}
	
	public static void setState(boolean active, World worldIn, BlockPos pos) 
	{
		IBlockState state = worldIn.getBlockState(pos);
		TileEntity tileentity = worldIn.getTileEntity(pos);
		
		if(active) worldIn.setBlockState(pos, BlockInit.ELECTRIC_SINTERING_FURNACE.getDefaultState().withProperty(FACING, state.getValue(FACING)).withProperty(BURNING, true), 3);
		else worldIn.setBlockState(pos, BlockInit.ELECTRIC_SINTERING_FURNACE.getDefaultState().withProperty(FACING, state.getValue(FACING)).withProperty(BURNING, false), 3);
		
		if(tileentity != null) 
		{
			tileentity.validate();
			worldIn.setTileEntity(pos, tileentity);
		}
	}
	
	@Override
	public boolean hasTileEntity() 
	{
		return true;
	}
	
	@Override
	public TileEntity createTileEntity(World world, IBlockState state)
	{
		return new TileEntityElectricSinteringFurnace();
	}
	
	@Override
	public IBlockState getStateForPlacement(World world, BlockPos pos, EnumFacing facing, float hitX, float hitY, float hitZ, int meta, EntityLivingBase placer, EnumHand hand) 
	{
		return this.getDefaultState().withProperty(FACING, placer.getHorizontalFacing().getOpposite());
	}
	
	@Override
	public void onBlockPlacedBy(World worldIn, BlockPos pos, IBlockState state, EntityLivingBase placer, ItemStack stack) 
	{
		worldIn.setBlockState(pos, this.getDefaultState().withProperty(FACING, placer.getHorizontalFacing().getOpposite()), 2);
	}
	
	@Override
	public void breakBlock(World worldIn, BlockPos pos, IBlockState state) 
	{
		TileEntitySinteringFurnace tileentity = (TileEntitySinteringFurnace)worldIn.getTileEntity(pos);
		worldIn.spawnEntity(new EntityItem(worldIn, pos.getX(), pos.getY(), pos.getZ(), tileentity.getStackInSlot(0)));
		worldIn.spawnEntity(new EntityItem(worldIn, pos.getX(), pos.getY(), pos.getZ(), tileentity.getStackInSlot(1)));
		worldIn.spawnEntity(new EntityItem(worldIn, pos.getX(), pos.getY(), pos.getZ(), tileentity.getStackInSlot(2)));
		worldIn.spawnEntity(new EntityItem(worldIn, pos.getX(), pos.getY(), pos.getZ(), tileentity.getStackInSlot(3)));
		super.breakBlock(worldIn, pos, state);
	}
	
	@Override
	public EnumBlockRenderType getRenderType(IBlockState state) 
	{
		return EnumBlockRenderType.MODEL;
	}
	
	@Override
	public IBlockState withRotation(IBlockState state, Rotation rot)
	{
		return state.withProperty(FACING, rot.rotate((EnumFacing)state.getValue(FACING)));
	}
	
	@Override
	public IBlockState withMirror(IBlockState state, Mirror mirrorIn) 
	{
		return state.withRotation(mirrorIn.toRotation((EnumFacing)state.getValue(FACING)));
	}
	
	@Override
	protected BlockStateContainer createBlockState() 
	{
		return new BlockStateContainer(this, new IProperty[] {BURNING,FACING});
	}
	
	@Override
	public IBlockState getStateFromMeta(int meta) 
	{
		EnumFacing facing = EnumFacing.getFront(meta);
		if(facing.getAxis() == EnumFacing.Axis.Y) facing = EnumFacing.NORTH;
		return this.getDefaultState().withProperty(FACING, facing);
	}
	
	@Override
	public int getMetaFromState(IBlockState state) 
	{
		return ((EnumFacing)state.getValue(FACING)).getIndex();
	}	
}

 

GUI Class 

package harry.mods.tutorialmod.blocks.gui;

import harry.mods.tutorialmod.Reference;
import harry.mods.tutorialmod.blocks.TileEntityElectricSinteringFurnace;
import harry.mods.tutorialmod.blocks.container.ContainerElectricSinteringFurnace;
import net.minecraft.client.gui.inventory.GuiContainer;
import net.minecraft.client.renderer.GlStateManager;
import net.minecraft.entity.player.InventoryPlayer;
import net.minecraft.util.ResourceLocation;

public class GuiElectricSinteringFurnace extends GuiContainer
{
	private static final ResourceLocation TEXTURES = new ResourceLocation(Reference.MODID + ":textures/gui/electric_sintering_furnace.png");
	private final InventoryPlayer player;
	private final TileEntityElectricSinteringFurnace tileentity;
	
	public GuiElectricSinteringFurnace(InventoryPlayer player, TileEntityElectricSinteringFurnace tileentity) 
	{
		super(new ContainerElectricSinteringFurnace(player, tileentity));
		this.player = player;
		this.tileentity = tileentity;
	}
	
	@Override
	protected void drawGuiContainerForegroundLayer(int mouseX, int mouseY) 
	{
		String tileName = this.tileentity.getDisplayName().getUnformattedText();
		this.fontRenderer.drawString(tileName, (this.xSize / 2 - this.fontRenderer.getStringWidth(tileName) / 2) -5, 6, 4210752);
		this.fontRenderer.drawString(this.player.getDisplayName().getUnformattedText(), 7, this.ySize - 96 + 2, 4210752);
		this.fontRenderer.drawString(Integer.toString(this.tileentity.getEnergyStored()), 125, 72, 4210752);
	}
	
	@Override
	protected void drawGuiContainerBackgroundLayer(float partialTicks, int mouseX, int mouseY)
	{
		GlStateManager.color(1.0f, 1.0f, 1.0f, 1.0f);
		this.mc.getTextureManager().bindTexture(TEXTURES);
		this.drawTexturedModalRect(this.guiLeft, this.guiTop, 0, 0, this.xSize, this.ySize);
		
		int l = this.getCookProgressScaled(24);
		this.drawTexturedModalRect(this.guiLeft + 44, this.guiTop + 36, 176, 14, l + 1, 16);
		
		int k = this.getEnergyStoredScaled(75);
		this.drawTexturedModalRect(this.guiLeft + 152, this.guiTop + 7, 176, 32, 16, 75 - k);
	}
	
	private int getCookProgressScaled(int pixels)
	{
		int i = this.tileentity.cookTime;
		return i != 0 ? i * pixels / 100 : 0;
	}
	
	private int getEnergyStoredScaled(int pixels)
	{
		int i = this.tileentity.getEnergyStored();
		int j = this.tileentity.getMaxEnergyStored();
		return i != 0 && j != 0 ? i * pixels / j : 0; 
	}
}

 

GUIHandler 

package harry.mods.tutorialmod.handlers;

import harry.mods.tutorialmod.Reference;
import harry.mods.tutorialmod.blocks.TileEntityElectricSinteringFurnace;
import harry.mods.tutorialmod.blocks.container.ContainerCopperChest;
import harry.mods.tutorialmod.blocks.container.ContainerElectricSinteringFurnace;
import harry.mods.tutorialmod.blocks.container.ContainerSinteringFurnace;
import harry.mods.tutorialmod.blocks.gui.GuiCopperChest;
import harry.mods.tutorialmod.blocks.gui.GuiElectricSinteringFurnace;
import harry.mods.tutorialmod.blocks.gui.GuiSinteringFurnace;
import harry.mods.tutorialmod.blocks.tileentity.TileEntityCopperChest;
import harry.mods.tutorialmod.blocks.tileentity.TileEntitySinteringFurnace;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.util.math.BlockPos;
import net.minecraft.world.World;
import net.minecraftforge.fml.common.network.IGuiHandler;

public class GuiHandler implements IGuiHandler
{
	@Override
	public Object getServerGuiElement(int ID, EntityPlayer player, World world, int x, int y, int z) 
	{
		if(ID == Reference.GUI_SINTERING_FURNACE) return new ContainerSinteringFurnace(player.inventory, (TileEntitySinteringFurnace)world.getTileEntity(new BlockPos(x,y,z)));
		if(ID == Reference.GUI_COPPER_CHEST) return new ContainerCopperChest(player.inventory, (TileEntityCopperChest)world.getTileEntity(new BlockPos(x,y,z)), player);
		if(ID == Reference.GUI_ELECTRIC_SINTERING_FURNACE) return new ContainerElectricSinteringFurnace(player.inventory, (TileEntityElectricSinteringFurnace)world.getTileEntity(new BlockPos(x,y,z)));
		return null;
	}
	
	@Override
	public Object getClientGuiElement(int ID, EntityPlayer player, World world, int x, int y, int z) 
	{
		if(ID == Reference.GUI_SINTERING_FURNACE) return new GuiSinteringFurnace(player.inventory, (TileEntitySinteringFurnace)world.getTileEntity(new BlockPos(x,y,z)));
		if(ID == Reference.GUI_COPPER_CHEST) return new GuiCopperChest(player.inventory, (TileEntityCopperChest)world.getTileEntity(new BlockPos(x,y,z)), player);
		if(ID == Reference.GUI_ELECTRIC_SINTERING_FURNACE) return new GuiElectricSinteringFurnace(player.inventory, (TileEntityElectricSinteringFurnace)world.getTileEntity(new BlockPos(x,y,z)));
		return null;
	}
}

 

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