path: root/c++/src/H5Object.cpp

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  * Copyright by the Board of Trustees of the University of Illinois.         *
  * All rights reserved.                                                      *
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  * root level of an installed copy of the electronic HDF5 document set and   *
  * is linked from the top-level documents page.  It can also be found at     *
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#include <string>

#include "H5Include.h"
#include "H5RefCounter.h"
#include "H5Exception.h"
#include "H5IdComponent.h"
#include "H5Idtemplates.h"
#include "H5PropList.h"
#include "H5Object.h"
#include "H5DataType.h"
#include "H5DataSpace.h"
#include "H5AbstractDs.h"
#include "H5Attribute.h"

#ifndef H5_NO_NAMESPACE
namespace H5 {
#endif

// userAttrOpWrpr simply interfaces between the user's function and the
// C library function H5Aiterate; used to resolve the different prototype 
// problem.  May be moved to Iterator later.
extern "C" herr_t userAttrOpWrpr( hid_t loc_id, const char* attr_name, void* op_data )
{
   string s_attr_name = string( attr_name );
#ifdef NO_STATIC_CAST
   UserData4Aiterate* myData = (UserData4Aiterate *) op_data;
#else
   UserData4Aiterate* myData = static_cast <UserData4Aiterate *> (op_data);
#endif
   myData->op( *myData->object, s_attr_name, myData->opData );
   return 0;
}

//--------------------------------------------------------------------------
// Function:	H5Object default constructor (protected)
// Description
//		The id is set to 0 here but subclass constructor will set
//		it to a valid HDF5 id.
// Programmer	Binh-Minh Ribler - 2000
//--------------------------------------------------------------------------
H5Object::H5Object() : IdComponent() {}

//--------------------------------------------------------------------------
// Function:	H5Object overloaded constructor (protected)
// Purpose	Creates an H5Object object using the id of an existing H5 
// 		object.
// Parameters	object_id - IN: Id of an existing H5 object
// Programmer	Binh-Minh Ribler - 2000
//--------------------------------------------------------------------------
H5Object::H5Object( const hid_t object_id ) : IdComponent( object_id ) {}

//--------------------------------------------------------------------------
// Function:	H5Object copy constructor
///\brief	Copy constructor: makes a copy of the original H5Object 
///		instance.
///\param	original - IN: H5Object instance to copy
// Programmer	Binh-Minh Ribler - 2000
//--------------------------------------------------------------------------
H5Object::H5Object( const H5Object& original ) : IdComponent( original ) {}

//--------------------------------------------------------------------------
// Function:	H5Object::createAttribute
///\brief	Creates an attribute for a group, dataset, or named datatype.
///\param	name - IN: Name of the attribute
///\param	data_type - IN: Datatype for the attribute
///\param	data_space - IN: Dataspace for the attribute - only simple 
///		dataspaces are allowed at this time
///\param	create_plist - IN: Creation property list - default to 
///		PropList::DEFAULT
///\return	Attribute instance
///\exception	H5::AttributeIException
///\par Description
///		The attribute name specified in \a name must be unique. 
///		Attempting to create an attribute with the same name as an 
///		existing attribute will raise an exception, leaving the 
///		pre-existing attribute intact. To overwrite an existing 
///		attribute with a new attribute of the same name, first 
///		delete the existing one with \c H5Object::removeAttr, then
///		recreate it with this function.
// Programmer	Binh-Minh Ribler - 2000
//--------------------------------------------------------------------------
Attribute H5Object::createAttribute( const char* name, const DataType& data_type, const DataSpace& data_space, const PropList& create_plist ) const
{
   hid_t type_id = data_type.getId();
   hid_t space_id = data_space.getId();
   hid_t plist_id = create_plist.getId();
   hid_t attr_id = H5Acreate( id, name, type_id, space_id, plist_id );

   // If the attribute id is valid, create and return the Attribute object
   if( attr_id > 0 )
   {
      Attribute attr( attr_id );
      return( attr );
   }
   else
   {
      throw AttributeIException("H5Object::createAttribute", "H5Acreate failed");
   }
}

//--------------------------------------------------------------------------
// Function:	H5Object::createAttribute
///\brief	This is an overloaded member function, provided for convenience.
///		It differs from the above function in that it takes 
///		a reference to an \c std::string for \a name.
// Programmer	Binh-Minh Ribler - 2000
//--------------------------------------------------------------------------
Attribute H5Object::createAttribute( const string& name, const DataType& data_type, const DataSpace& data_space, const PropList& create_plist ) const
{
   return( createAttribute( name.c_str(), data_type, data_space, create_plist ));
}

//--------------------------------------------------------------------------
// Function:	H5Object::openAttribute
///\brief	Opens an attribute given its name.
///\param	name - IN: Name of the attribute
///\return	Attribute instance
///\exception	H5::AttributeIException
// Programmer	Binh-Minh Ribler - 2000
//--------------------------------------------------------------------------
Attribute H5Object::openAttribute( const char* name ) const
{
   hid_t attr_id = H5Aopen_name( id, name );
   if( attr_id > 0 )
   {
      Attribute attr( attr_id );
      return( attr );
   }
   else
   {
      throw AttributeIException("H5Object::openAttribute", "H5Aopen_name failed");
   }
}

//--------------------------------------------------------------------------
// Function:	H5Object::openAttribute
///\brief	This is an overloaded member function, provided for convenience.
///		It differs from the above function in that it takes 
///		a reference to an \c std::string for \a name.
// Programmer	Binh-Minh Ribler - 2000
//--------------------------------------------------------------------------
Attribute H5Object::openAttribute( const string& name ) const
{
   return( openAttribute( name.c_str()) );
}

//--------------------------------------------------------------------------
// Function:	H5Object::openAttribute
///\brief	Opens an attribute given its index.
///\param	idx - IN: Index of the attribute, a 0-based, non-negative integer
///\return	Attribute instance
///\exception	H5::AttributeIException
// Programmer	Binh-Minh Ribler - 2000
//--------------------------------------------------------------------------
Attribute H5Object::openAttribute( const unsigned int idx ) const
{
   hid_t attr_id = H5Aopen_idx( id, idx );
   if( attr_id > 0 )
   {
      Attribute attr( attr_id );
      return( attr );
   }
   else
   {
      throw AttributeIException("H5Object::openAttribute", "H5Aopen_idx failed");
   }
}

//--------------------------------------------------------------------------
// Function:	H5Object::iterateAttrs
///\brief	Iterates a user's function over all the attributes of an H5
///		object, which may be a group, dataset or named datatype.
///\param	user_op - IN: User's function to operate on each attribute
///\param	idx - IN/OUT: Starting (IN) and ending (OUT) attribute indices
///\param	op_data - IN: User's data to pass to user's operator function 
///\return	Returned value of the last operator if it was non-zero, or 
///		zero if all attributes were processed
///\exception	H5::AttributeIException
// Programmer	Binh-Minh Ribler - 2000
//--------------------------------------------------------------------------
int H5Object::iterateAttrs( attr_operator_t user_op, unsigned * idx, void *op_data )
{
   // store the user's function and data
   UserData4Aiterate* userData = new UserData4Aiterate;
   userData->opData = op_data;
   userData->idx = idx;
   userData->op = user_op;
   userData->object = this;

   // call the C library routine H5Aiterate to iterate the attributes
   int ret_value = H5Aiterate( id, idx, userAttrOpWrpr, (void *) userData );
   // release memory
   delete userData;

   if( ret_value >= 0 )
      return( ret_value );
   else  // raise exception when H5Aiterate returns a negative value
   {
      throw AttributeIException("H5Object::iterateAttrs", "H5Aiterate failed");
   }
}

//--------------------------------------------------------------------------
// Function:	H5Object::getNumAttrs
///\brief	Returns the number of attributes attached to this H5 object.
///\return	Number of attributes
///\exception	H5::AttributeIException
// Programmer	Binh-Minh Ribler - 2000
//--------------------------------------------------------------------------
int H5Object::getNumAttrs() const
{
   int num_attrs = H5Aget_num_attrs( id );
   if( num_attrs < 0 )
   {
      throw AttributeIException("H5Object::getNumAttrs", 
		"H5Aget_num_attrs failed - returned negative number of attributes");
   }
   else
      return( num_attrs );
}

//--------------------------------------------------------------------------
// Function:	H5Object::removeAttr
///\brief	Removes the named attribute from this object.
///\param	name - IN: Name of the attribute to be removed
///\exception	H5::AttributeIException
// Programmer	Binh-Minh Ribler - 2000
//--------------------------------------------------------------------------
void H5Object::removeAttr( const char* name ) const
{
   herr_t ret_value = H5Adelete( id, name );
   if( ret_value < 0 )
   {
      throw AttributeIException("H5Object::removeAttr", "H5Adelete failed");
   }
}

//--------------------------------------------------------------------------
// Function:	H5Object::removeAttr
///\brief	This is an overloaded member function, provided for convenience.
///		It differs from the above function in that it takes 
///		a reference to an \c std::string for \a name.
// Programmer	Binh-Minh Ribler - 2000
//--------------------------------------------------------------------------
void H5Object::removeAttr( const string& name ) const
{
   removeAttr( name.c_str() );
}

//--------------------------------------------------------------------------
// Function:	H5Object::flush
///\brief	Flushes all buffers associated with a file to disk.
///\param	scope - IN: Specifies the scope of the flushing action,
///		which can be either of these values:
///		\li \c H5F_SCOPE_GLOBAL - Flushes the entire virtual file
///		\li \c H5F_SCOPE_LOCAL - Flushes only the specified file
///\exception	H5::AttributeIException
///\par Description
///		This object is used to identify the file to be flushed.
// Programmer	Binh-Minh Ribler - 2000
//--------------------------------------------------------------------------
void H5Object::flush(H5F_scope_t scope ) const
{
   herr_t ret_value = H5Fflush( id, scope );
   if( ret_value < 0 )
   {
      throw FileIException("H5Object::flush", "H5Fflush failed");
   }
}

//--------------------------------------------------------------------------
// Function:	H5Object::Reference
///\brief	Creates a reference to an Hdf5 object.
///\param	name - IN: Name of the object to be referenced
///\return	A reference
///\exception	H5::ReferenceIException
///\par Description
//		This function passes H5R_OBJECT and -1 to the C API H5Rcreate
//		to create a reference to the named object.  The next function
//		will create a reference to a dataset region.
// Programmer	Binh-Minh Ribler - May, 2004
//--------------------------------------------------------------------------
void* H5Object::Reference(const char* name) const
{
   void *ref;
   herr_t ret_value = H5Rcreate(ref, id, name, H5R_OBJECT, -1);
   if (ret_value < 0)
   {
      throw AttributeIException("H5Object::Reference", 
		"H5Rcreate failed");
   }
   return(ref);
}

//--------------------------------------------------------------------------
// Function:	H5Object::Reference
///\brief	Creates a reference.
///\param	name - IN: Name of the object to be referenced
///\param	dataspace - IN: Dataspace with selection
///\param	ref_type - IN: Type of reference; default to \c H5R_DATASET_REGION
///\return	A reference
///\exception	H5::ReferenceIException
// Programmer	Binh-Minh Ribler - May, 2004
//--------------------------------------------------------------------------
void* H5Object::Reference(const char* name, DataSpace& dataspace, H5R_type_t ref_type) const
{
   void *ref;
   herr_t ret_value = H5Rcreate(ref, id, name, ref_type, dataspace.getId());
   if (ret_value < 0)
   {
      throw AttributeIException("H5Object::Reference", 
		"H5Rcreate failed");
   }
   return(ref);
}

//--------------------------------------------------------------------------
// Function:	H5Object destructor
///\brief	Noop destructor.
// Programmer	Binh-Minh Ribler - 2000
//--------------------------------------------------------------------------
H5Object::~H5Object() {}

#ifndef H5_NO_NAMESPACE
} // end namespace
#endif