public void setDecoy(boolean isso) {
    if (m_Peptide == null) return;
    if (m_Peptide.isDecoy() == isso) return;

    if (isso) m_Peptide = m_Peptide.asDecoy();
  }
 public boolean isDecoy() {
   if (m_Peptide != null) return m_Peptide.isDecoy();
   else return false;
 }