private String getOtherGroup(Tile tile, Tile neighbor)
    {
        final String group = mapGroup.getGroup(tile);
        for (final Tile shared : getSharedNeigbors(tile, neighbor))
        {
            final String sharedNeighborGroup = mapGroup.getGroup(shared);
            if (!group.equals(sharedNeighborGroup) && !isTransition(shared))
            {
                return sharedNeighborGroup;
            }
        }
        return null;
    }
private String getOtherGroup ( Tile tile , Tile neighbor ) { final String group = mapGroup . getGroup ( tile ) ; for ( final Tile shared : getSharedNeigbors ( tile , neighbor ) ) { final String sharedNeighborGroup = mapGroup . getGroup ( shared ) ; if ( ! group . equals ( sharedNeighborGroup ) && ! isTransition ( shared ) ) { return sharedNeighborGroup ; } } return null ; }
Get the other transition group, excluding the current group and transition itself.

@param tile The tile reference.
@param neighbor The neighbor reference.
@return The third group, excluding transition group and tile reference group, <code>null</code> if none.