trigger StockItemTrigger on Stock_Item__c (before insert, before delete) {

	//Instantiate StockItemHandler


	//Before Insert Handling
	if(Trigger.isInsert && Trigger.isBefore) {
		//call the class in your handler for before insert
		StockItemHandler.onBeforeInsert(Trigger.new);
	}

	//Before Delete Handling
	else if(Trigger.isDelete && Trigger.isBefore) {
		//call the class in your handler for before delete
		StockItemHandler.onBeforeDelete(Trigger.old, Trigger.oldMap);
	}


}