Migration of ADF table selection code to Trinidad code problem with RowKeySet

we found a conversion problem as described below in one of the java files related to Manual UI.

    public void setPsdTable(CoreTable psdTable) {

        this.psdTable = psdTable;

        if (globalBean.isResetCreateRequestPsdQuarters()){

   ADF -code         this.psdTable.setSelectionState(new RowKeySet());

   Trinidad code     this.psdTable.setSelectedRowKeys(new RowKeySet());

            globalBean.setResetCreateRequestPsdQuarters(false);

        }

    }

In Trinidad RowKeySet is abstract class whereas in ADF the same is normal class. Hence I found the below error message.

• Error(364,45): org.apache.myfaces.trinidad.model.RowKeySet is abstract; cannot be instantiated

Please guide me if you have an idea on how to change the adf statement to Trinidad code statement “this.psdTable.setSelectionState(new RowKeySet());”