Restrict Opportunity Deletion Based on Stage

This trigger restricts Opportunity deletion if the Stage is “Closed Won” or “Closed Lost.” Only System Administrators can delete such Opportunities.

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Solution:

trigger OpportunityTrigger on Opportunity (before delete) {
        if(Trigger.isDelete){ if(Trigger.isBefore){
                                                        OpportunityTriggerHandler.checkProfileForDeletion(Trigger.old);
                       }
          }
}
public class OpportunityTriggerHandler { public static void

             checkProfileForDeletion(List<Opportunity> oppList){

                                         Profile p = [SELECT Id FROM Profile WHERE Name = ‘System
                                Administrator’]; for(Opportunity opp:oppList){ if(opp.StageName == ‘Closed
                     Won’ || opp.StageName ==
                                          ‘Closed Lost’) if(UserInfo.getProfileId() != p.Id){ opp.addError(‘Only
                               System administrator can delete opportunity’);
                               }
                  }
     }
}