hdf5/c++/src/H5Group.cpp

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#include <string>
#ifdef OLD_HEADER_FILENAME
#include <iostream.h>
#else
#include <iostream>
#endif

#include "H5Include.h"
#include "H5RefCounter.h"
#include "H5Exception.h"
#include "H5IdComponent.h"
#include "H5Idtemplates.h"
#include "H5PropList.h"
#include "H5Object.h"
#include "H5AbstractDs.h"
#include "H5FaccProp.h"
#include "H5FcreatProp.h"
#include "H5DcreatProp.h"
#include "H5DxferProp.h"
#include "H5DataSpace.h"
#include "H5DataSet.h"
#include "H5CommonFG.h"
#include "H5Group.h"
#include "H5File.h"
#include "H5Alltypes.h"

#ifndef H5_NO_NAMESPACE
namespace H5 {
#endif

// Default constructor
Group::Group() : H5Object() {}

// Copy constructor: makes a copy of the original Group object 
Group::Group( const Group& original ) : H5Object( original ) {}

// Get id of the location, which id the group id here; used by CommonFG
// member functions
hid_t Group::getLocId() const
{
   return( getId() );
}

// Creates a copy of an existing Group using its id
Group::Group( const hid_t group_id ) : H5Object( group_id ) {}

// Returns the number of objects in the group.
hsize_t Group::getNumObjs() const
{
   hsize_t num_objs;
   herr_t ret_value = H5Gget_num_objs(id, &num_objs);
   if(ret_value < 0)
   {
      throwException("getNumObjs", "H5Gget_num_objs failed");
   }
   return (num_objs);
}

// Retrieves the name of an object in a given group by giving index
ssize_t Group::getObjnameByIdx(hsize_t idx, string& name, size_t size) const
{
   char* name_C = new char[size];
   ssize_t name_len = H5Gget_objname_by_idx(id, idx, name_C, size);
   if(name_len < 0)
   {
      throwException("getObjnameByIdx", "H5Gget_objname_by_idx failed");
   }
   name = string( name_C );
   delete [] name_C;
   return (name_len);
}

// Returns the type of an object in a given group by giving index
int Group::getObjTypeByIdx(hsize_t idx) const
{
   int obj_type = H5Gget_objtype_by_idx(id, idx);
   if (obj_type == H5G_UNKNOWN)
   {
	   throwException("getObjTypeByIdx", "H5Gget_objtype_by_idx failed");
   }
   return (obj_type);
}
int Group::getObjTypeByIdx(hsize_t idx, string& type_name) const
{
   int obj_type = H5Gget_objtype_by_idx(id, idx);
   switch (obj_type)
   {
	case H5G_GROUP: type_name = string("group"); break;
	case H5G_DATASET: type_name = string("dataset"); break;
	case H5G_TYPE: type_name = string("datatype"); break;
	case H5G_UNKNOWN:
	default:
   	{
	   throwException("getObjTypeByIdx", "H5Gget_objtype_by_idx failed");
	}
   }
   return (obj_type);
}

// Iterates a user's function over the entries of a group.
//int Group::iterateElems( const string& name, int *idx, H5G_iterate_t op , void *op_data )
//{
   //return( iterateElems( name.c_str(), idx, op, op_data ));
//}
//int Group::iterateElems( const char* name, int *idx, H5G_iterate_t op , void *op_data )
//{
   //int ret_value = H5Giterate( id, name, idx, op, op_data );
   //if( ret_value >= 0 )
      //return( ret_value );
   //else  // raise exception when H5Aiterate returns a negative value
   //{
      //throw GroupIException("Group::iterateElems", "H5Giterate failed");
   //}
//}

// Calls the C API H5Gclose to close this group.  Used by IdComponent::reset
void Group::p_close() const
{
   herr_t ret_value = H5Gclose( id );
   if( ret_value < 0 )
   {
      throw GroupIException(0, "H5Gclose failed");
   }
}

// Throw file exception
void Group::throwException(const string func_name, const string msg) const
{
   string full_name = func_name;
   full_name.insert(0, "Group::");
   throw GroupIException(full_name, msg);
}

// The destructor of this instance calls IdComponent::reset to
// reset its identifier - no longer true
// Older compilers (baldric) don't support template member functions
// and IdComponent::reset is one; so at this time, the resetId is not
// a member function so it can be template to work around that problem.
Group::~Group()
{  
   // The group id will be closed properly
    try {
        resetIdComponent( this ); }
    catch (Exception close_error) { // thrown by p_close
        cerr << "Group::~Group - " << close_error.getDetailMsg() << endl;
    }

}  

#ifndef H5_NO_NAMESPACE
} // end namespace
#endif