new weapon = GetPlayerWeaponSlot(client, TFWeaponSlot_Melee);
if (weapon != -1 && IsValidEntity(weapon))
{
	new index = GetEntProp(BossMeleeweapon, Prop_Send, "m_iItemDefinitionIndex");
	switch (index)
	{
		case 1:
		{
			// Do Stuff
		}
		case 2:
		{
			// Do other Stuff
		}
		default:
		{
			// Do another Stuff
		}
	}
}