TinkersConstruct/src/main/java/tconstruct/armor/items/DiamondApple.java

package tconstruct.armor.items;

import net.minecraft.client.renderer.texture.IIconRegister;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.item.*;
import net.minecraft.potion.*;
import net.minecraft.util.IIcon;
import net.minecraft.world.World;

import cpw.mods.fml.relauncher.*;

public class DiamondApple extends ItemFood {

    public IIcon[] icons;
    public String[] textureNames = new String[] { "food/apple_diamond" };
    public String[] itemNames = new String[] { "apple.diamond" };

    public DiamondApple() {
        super(4, 2.0F, false);
        setHasSubtypes(true);
        setMaxDamage(0);
        this.setAlwaysEdible();
    }

    @Override
    protected void onFoodEaten(ItemStack stack, World world, EntityPlayer player) {
        if (!world.isRemote) {
            int duration = 0;
            PotionEffect potion;

            potion = player.getActivePotionEffect(Potion.resistance);
            if (potion != null) duration = potion.getDuration();
            player.addPotionEffect(new PotionEffect(Potion.field_76444_x.id, duration + 60 * 40, 4));

            potion = player.getActivePotionEffect(Potion.resistance);
            if (potion != null) duration = potion.getDuration();
            player.addPotionEffect(new PotionEffect(Potion.resistance.id, duration + 60 * 20, 0));

            potion = player.getActivePotionEffect(Potion.digSpeed);
            if (potion != null) duration = potion.getDuration();
            player.addPotionEffect(new PotionEffect(Potion.digSpeed.id, duration + 60 * 20, 0));

            potion = player.getActivePotionEffect(Potion.damageBoost);
            if (potion != null) duration = potion.getDuration();
            player.addPotionEffect(new PotionEffect(Potion.damageBoost.id, duration + 60 * 20, 0));
        }
    }

    @SideOnly(Side.CLIENT)
    @Override
    public IIcon getIconFromDamage(int meta) {
        return icons[meta];
    }

    @SideOnly(Side.CLIENT)
    @Override
    public void registerIcons(IIconRegister iconRegister) {
        this.icons = new IIcon[textureNames.length];

        for (int i = 0; i < this.icons.length; ++i) {
            this.icons[i] = iconRegister.registerIcon("tinker:" + textureNames[i]);
        }
    }

    /* Name override */
    @Override
    public String getUnlocalizedName(ItemStack itemstack) {
        return "item.food."
                + itemNames[(itemstack.getItemDamage() >= itemNames.length || itemstack.getItemDamage() < 0) ? (0)
                        : (itemstack.getItemDamage())];
    }
}