code: public static int isTetrahedral(IAtomContainer container, IAtom atom, boolean strict) {
          List<IAtom> atoms = container.getConnectedAtomsList(atom);
          if (atoms.size() != 4) {
              return (0);
          }
          List<IBond> bonds = container.getConnectedBondsList(atom);
          int up = 0;
          int down = 0;
          for (IBond bond : bonds) {
              if (bond.getStereo() == IBond.Stereo.NONE || bond.getStereo() == CDKConstants.UNSET) {
              } else if (bond.getStereo() == IBond.Stereo.UP) {
                  up++;
              } else if (bond.getStereo() == IBond.Stereo.DOWN) {
                  down++;
              }
          }
          if (up == 1 && down == 1) {
              return 1;
          }
          if (up == 2 && down == 2) {
              if (stereosAreOpposite(container, atom)) {
                  return 2;
              }
              return 0;
          }
          if (up == 1 && down == 0 && !strict) {
              return 3;
          }
          if (down == 1 && up == 0 && !strict) {
              return 4;
          }
          if (down == 2 && up == 1 && !strict) {
              return 5;
          }
          if (down == 1 && up == 2 && !strict) {
              return 6;
          }
          return 0;
      }
docs: Says if an atom as a center of a tetrahedral chirality.
  This method uses wedge bonds. 3D coordinates are not taken into account. If there
  are no wedge bonds around a potential stereo center, it will not be found.
  
  @param  atom          The atom which is the center
  @param  container  The atomContainer the atom is in
  @return            0=is not tetrahedral; &gt;1 is a certain depiction of
  tetrahedrality (evaluated in parse chain)