TaskTriggerHandler

gistfile1.txt

public with sharing class TaskTriggerHandler {
    public void handleTaskCreation(){
        List<Task> allTasks =   [   SELECT
                                        TYPEOF What
                                            WHEN Case THEN Id, CaseNumber
                                            WHEN Account THEN Id, Name
                                        END
                                    FROM TASK Where Id in: Trigger.new
                                ];
        for(Task singleTask : allTasks){
            switch on (SObject) singleTask.What {
                when Case c {
                    System.Debug('Task is associated with Case: ' + c.CaseNumber);
                }
                when Account a {
                    System.Debug('Task is associated with Account: ' + a.Name);
                }
            }
        }
    }
}