Cast a Map <Id, sObject> to Map <Id, Opportunity>

Question

I'm trying to implement the trigger framework outlined here:

The triggerhandler methods take lists or maps of sObjects as their inputs. In his example he casts list <sObject> as list <Account> by doing:

public void BeforeInsert(List<SObject> newItems) 
    {
        for (Account acc : (List<Account>)newItems)

What is the equivalent for:

public void AfterInsert(Map<Id, SObject> newItems) {
for (opporutnity opp: (........).values()

Answer 1

The .values() method will return a list of sObjects, which means that you can simply follow the same scenario and cast the list to a concrete sObject type:

for (Opportunity opp : (List <Opportunity>)newItems.values())

As long as all the values are of type "Opportunity" and you know that for sure.

The alternative way is to work with generic sObjects the whole time:

for (sObject opp : newItems.values())

Read more about dynamic apex

Answer 2

I know this is old, but still pulls up as the result via a google search. So I'm going to post something I have had luck with.

If you know what sObject you are converting into, I've had success doing this:

objList //we'll say this is a Map<Id, sObject> where the sObject is an Opportunity
 List<Opportunity> oppList = objList.values();

Or looping:

   for(Opportunity o : objList.values())
   {
    //operations
   }

It's a little different than the previous answer given, so I hope someone finds it useful.

Edit: Apologies, realized this is for Map to Map. However I'll leave this because in some situations converting to a list from a Map will be beneficial as it should have already removed dups from being in a map, and then you can iterate through the list or perform DML on it.

Answer 3

You can iterate over a hash map using:

public void AfterInsert(Map<Id, SObject> newItems) {
    for (Id key: newItems.keySet())
    {
        Opportunity opp = (Opportunity)newItems.get(key);
        //do something with your opp
    }
}

So basically what you are doing here is:

• using the keySet() method on the Map to get an iterator (so you're looping on the keys)
• Then using that key, you get that particular SObject from your map (using the get() method)
• Then you are type casting from SObject directly to an Opportunity class

There's an example here: Iterating over a map (Apex)