All about workflow manipulation

autoApproveWF

public void autoApproveWF(Common _common, str _user)
    {
        WorkflowWorkItemTable WorkflowWorkItemTable;

        select WorkflowWorkItemTable
            where  workflowWorkItemTable.Type   == WorkflowWorkItemType::WorkItem
            &&  workflowWorkItemTable.Status    == WorkflowWorkItemStatus::Pending
            &&  WorkflowWorkItemTable.RefTableId== _common.TableId
            &&  WorkflowWorkItemTable.RefRecId  ==  _common.RecId;

        WorkflowWorkItemActionManager::dispatchWorkItemAction(
                                WorkflowWorkItemTable,
                                "Auto Approve by system",
                                _user,
                                WorkflowWorkItemActionType::Complete,
                                menuitemDisplayStr(PurchReqTable)); 
    }

currentWFUser

public WorkflowUser currentWFUser(Common _common)
    {
        WorkflowTrackingStatusTable workflowTrackingStatusTable;
        WorkflowTrackingTable       workflowTrackingTable; 
        
        select firstonly RecId from workflowTrackingStatusTable
            join User from workflowTrackingTable
            order by WorkflowTrackingTable.CreatedDateTime desc
            where workflowTrackingTable.WorkflowTrackingStatusTable == workflowTrackingStatusTable.RecId
            && workflowTrackingStatusTable.ContextRecId             == _common.RecId
            && workflowTrackingStatusTable.ContextTableId           == _common.TableId
            && workflowTrackingTable.TrackingContext                == WorkflowTrackingContext::WorkItem;

        return workflowTrackingTable.User;
    }