Sample code change after ItemStack#setItem deprecation

NewItemTorch.java

public static boolean extinguishItemTorch(ItemStack stack, Entity owner, int itemSlot, boolean extinguishByWater)
{
    	if (extinguishByWater == true)
    		setItemHumidity(stack.getTagCompound(), SharedDefines.TORCH_HUMIDITY_THRESHOLD);

    	if (ItemTorch.isItemTorch(stack.getItem(), false))
    	{
    		ItemStack unlitTorch = new ItemStack(ResourceLibrary.TORCH_UNLIT, 1);
    		ItemTorch.createCustomItemNBTFromExisting(unlitTorch, owner.worldObj, stack.getTagCompound());
    		
    		if (owner instanceof EntityPlayer)	
    		{
    			EntityPlayer playerOwner = (EntityPlayer) owner;
    			final int mainInventorySize = playerOwner.inventory.mainInventory.length;
    			
    			if (itemSlot < 0)  // Search all player inventories to find the stack.
    			{
    				if (ItemStack.areItemStacksEqual(playerOwner.getHeldItemOffhand(), stack))
    				{
    					playerOwner.setHeldItem(EnumHand.OFF_HAND, unlitTorch);
    					return true;
    				}
    				else for (int i = 0; i < mainInventorySize; i++)
    				{
    					if (ItemStack.areItemStacksEqual(playerOwner.inventory.getStackInSlot(i), stack))
    					{
    						if (playerOwner.replaceItemInInventory(i, unlitTorch))
    							return true;
    					}
    				}
    			}
    			else if (itemSlot < mainInventorySize)  // Check for specific item slot
    			{
        			if (itemSlot == 0)   // Could be an OFF_HAND slot
        			{
        				if (ItemStack.areItemStacksEqual(playerOwner.getHeldItemOffhand(), stack))
        				{
        					playerOwner.setHeldItem(EnumHand.OFF_HAND, unlitTorch);
        					return true; 
        				}
        			}
        			
        			if (ItemStack.areItemStacksEqual(playerOwner.inventory.getStackInSlot(itemSlot), stack))
        			{
    					if (owner.replaceItemInInventory(itemSlot, unlitTorch))
    						return true;
        			}
        			else Logger.error("Failed to extinguish ItemTorch, item was not found in inventory.", new java.util.NoSuchElementException());
    			}
    			else Logger.error("Failed to extinguish ItemTorch, itemSlot value is invalid.", new java.lang.IllegalArgumentException());
    		}
    		else if (owner instanceof EntityItem)
    		{
    			((EntityItem) owner).setEntityItemStack(unlitTorch);
    			return true;
    		}
    		else Logger.error("Failed to extinguish ItemTorch, owner is not EntityPlayer or EntityItem.", new java.lang.IllegalArgumentException());
    	}
    	else Logger.error("Failed to extinguish ItemTorch, item is not a torch.", new java.lang.TypeNotPresentException("ItemTorch", null)); 

    	return false;
}

OldItemTorch.java

public static void extinguishItemTorch(ItemStack stack, boolean extinguishByWater)
{
    	if (stack != null && ItemTorch.isItemTorch(stack.getItem(), false))
    		stack.setItem(Item.getItemFromBlock(ResourceLibrary.TORCH_UNLIT));

    	else Logger.error("Failed to extinguish ItemTorch.", stack == null ? 
    			new NullPointerException("ItemStack was passed as null,") : new java.lang.TypeNotPresentException("ItemTorch", null));
    	
    	if (extinguishByWater == true)
    		setItemHumidity(stack.getTagCompound(), SharedDefines.TORCH_HUMIDITY_THRESHOLD);
}