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#include <cassert>
#include <cstdlib>
#include <sstream>
#include <string>

#include <hdf5.h>

#include "cctk.h"

#include "carpet.hh"

#include "defs.hh"

#include "meta_data_region.hh"
#include "utils.hh"



namespace CarpetIOF5 {
  
  namespace F5 {
    
    using std::ostringstream;
    
    
    
    meta_data_region_t::
    meta_data_region_t (physical_quantity_t & physical_quantity,
                        bbox<int, dim> const & region)
      : m_physical_quantity (physical_quantity),
        m_region (region),
        m_name (string ("region-") + F5::name_from_ibbox (region))
    {
      assert (not region.empty());
      
      assert (invariant());
    }
    
    
    
    meta_data_region_t::
    ~ meta_data_region_t ()
    {
    }
    
    
    
    physical_quantity_t & meta_data_region_t::
    get_physical_quantity ()
      const
    {
      return m_physical_quantity;
    }
    
    
    
    void meta_data_region_t::
    write (int const proc)
      const
    {
      DECLARE_CCTK_PARAMETERS;
      
      string filename;
      string objectname;
      get_physical_quantity().get_link_destination (proc, filename, objectname);
      
      hid_t const hdf5_physical_quantity
        = m_physical_quantity.get_hdf5_physical_quantity();
      
      bool link_exists;
      H5E_BEGIN_TRY {
        H5L_info_t linkbuf;
        herr_t const herr
          = H5Lget_info (hdf5_physical_quantity, m_name.c_str(),
                         & linkbuf, H5P_DEFAULT);
        link_exists = herr == 0;
      } H5E_END_TRY;
      if (veryverbose)
      {
        CCTK_VInfo (CCTK_THORNSTRING,
                    "Link \"%s\" %s",
                    m_name.c_str(),
                    link_exists ? "exists" : "does not exist");
      }
      
      if (not link_exists)
      {
        if (veryverbose)
        {
          CCTK_VInfo (CCTK_THORNSTRING,
                      "H5Lcreate_external "
                      "(filename=\"%s\", objectname=\"%s\", linkname=\"%s\")",
                      filename.c_str(),
                      objectname.c_str(),
                      m_name.c_str());
        }
        check (not H5Lcreate_external (filename.c_str(),
                                       objectname.c_str(),
                                       hdf5_physical_quantity,
                                       m_name.c_str(),
                                       H5P_DEFAULT, H5P_DEFAULT));
      }
    }
    
    
    
    bool meta_data_region_t::
    invariant ()
      const
    {
      return not m_region.empty();
    }
    
  } // namespace F5

} // namespace CarpetIOF5