Constructor not defined for constructor that's defined

Question

Pretty new to development, so I'm probably missing something easy. From advice on this site, I'm trying to move my org's triggers into a trigger handler to be more manageable. I've started converting my triggers into classes, however when I try to call a method of one of these classes, I'm getting a Constructor not defined error.

Here is my constructor:

public class AddProductFromOfferingId { 

    Map<Id, Lead> newLeads;

    public AddProductFromOfferingId(Map<Id, Lead> newTriggerLeads)
    {
        newLeads = newTriggerLeads;
    }
}

And here's where I try to call the constructor:

public void beforeInsert(SObject so)
    {
        // Cast the SObject to an Lead
        Lead theLead = (Lead)so;

        if(theLead.Offering_ID__c != null)
        {
            AddProductFromOfferingId addProd = new AddProductFromOfferingId(Trigger.newMap);
        }

The full error is: Constructor not defined: [AddProductFromOfferingId].<Constructor>(Map<Id, SOBject>).

In the constructor, I've named it AddProductFromOfferingId, requiring one Id, Lead map to be passed in. In my TriggerHandler class (second code snippet), I'm passing in a map. Can I not use Trigger.newMap in this way?

Update:

Thanks @BrianMansfield, your comment gave me what I needed. Adding the following to the handler class fixed my issue:

Map<Id, Lead> newMapFromTrigger = (Map<Id, Lead>) Trigger.newMap;

Answer 1

A bit of a way around it but you can cast the Map<ID,sObject> to the Map<ID,Lead> as follows:

//This lines could simply be your trigger.newMap records, query is just an example
Map<ID,sObject> l = New Map<ID,sObject>([Select ID From Lead limit 1]);

//Actual conversion here
Map<ID,Lead> a = New Map<ID,Lead>((Lead[])l.values());

BUT, I would change (if it makes sense) the constructor to:

AddProductFromOfferingId(Map<ID,sObject> newTriggerLeads){
     //If null or no records, nothing to do
     if(newTriggerLeads == null || newTriggerLeads.isEmpty()) return;

     //If we have lead records cast to a list of leads and do what we need to
     if(newTriggerLeads[0].getsObjectType() == Lead.sObjectType()){
          Lead[] theLeads = (List<Leads>)newTriggerLeads.values();
     }else{ //Not leads, do nothing
        return;
     }

}

Or something like that