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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Copyright by the Board of Trustees of the University of Illinois. *
* All rights reserved. *
* *
* This file is part of HDF5. The full HDF5 copyright notice, including *
* terms governing use, modification, and redistribution, is contained in *
* the files COPYING and Copyright.html. COPYING can be found at the root *
* of the source code distribution tree; Copyright.html can be found at the *
* 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 *
* http://hdf.ncsa.uiuc.edu/HDF5/doc/Copyright.html. If you do not have *
* access to either file, you may request a copy from hdfhelp@ncsa.uiuc.edu. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
#include <string>
#include "H5Include.h"
#include "H5Exception.h"
#include "H5RefCounter.h"
#include "H5IdComponent.h"
#include "H5Idtemplates.h"
#include "H5PropList.h"
#include "H5Object.h"
#include "H5AbstractDs.h"
#include "H5Attribute.h"
#include "H5DataType.h"
#include "H5DataSpace.h"
#ifndef H5_NO_NAMESPACE
namespace H5 {
#endif
// Copy constructor: makes a copy of the original object; simply invokes
// the base class copy constructor.
Attribute::Attribute( const Attribute& original ) : AbstractDs( original ) {}
// Creates a copy of an existing attribute using an id
Attribute::Attribute( const hid_t attr_id ) : AbstractDs( attr_id ) {}
// Writes data to this attribute.
void Attribute::write( const DataType& mem_type, const void *buf ) const
{
herr_t ret_value = H5Awrite( id, mem_type.getId(), buf );
if( ret_value < 0 )
{
throw AttributeIException("Attribute::write", "H5Awrite failed");
}
}
// Reads data from this attribute.
void Attribute::read( const DataType& mem_type, void *buf ) const
{
herr_t ret_value = H5Aread( id, mem_type.getId(), buf );
if( ret_value < 0 )
{
throw AttributeIException("Attribute::read", "H5Aread failed");
}
}
// Gets a copy of the dataspace for this attribute.
DataSpace Attribute::getSpace() const
{
// Calls C function H5Aget_space to get the id of the dataspace
hid_t dataspace_id = H5Aget_space( id );
// If the dataspace id is valid, create and return the DataSpace object
if( dataspace_id > 0 )
{
DataSpace dataspace( dataspace_id );
return( dataspace );
}
else
{
throw AttributeIException("Attribute::getSpace", "H5Aget_space failed");
}
}
// This private member function calls the C API to get the generic datatype
// of the datatype that is used by this attribute. This function is used
// by the overloaded functions getDataType defined in AbstractDs for the
// generic datatype and specific sub-types.
hid_t Attribute::p_getType() const
{
hid_t type_id = H5Aget_type( id );
if( type_id > 0 )
return( type_id );
else
{
throw AttributeIException(0, "H5Aget_type failed");
}
}
// Gets the name of this attribute, returning its length.
ssize_t Attribute::getName( size_t buf_size, string& attr_name ) const
{
char* name_C = new char[buf_size+1]; // temporary C-string for C API
// Calls C routine H5Aget_name to get the name of the attribute
ssize_t name_size = H5Aget_name( id, buf_size, name_C );
// If H5Aget_name returns a negative value, raise an exception,
if( name_size < 0 )
{
throw AttributeIException("Attribute::getName", "H5Aget_name failed");
}
// otherwise, convert the C string attribute name and return
attr_name = string( name_C );
delete name_C;
return( name_size );
}
// Gets the name of this attribute, returning the name, not the length.
string Attribute::getName( size_t buf_size ) const
{
string attr_name;
ssize_t name_size = getName( buf_size, attr_name );
return( attr_name );
// let caller catch exception if any
}
// This private function calls the C API H5Aclose to close this attribute.
// Used by the IdComponent::reset.
void Attribute::p_close() const
{
herr_t ret_value = H5Aclose( id );
if( ret_value < 0 )
{
throw AttributeIException(0, "H5Aclose failed");
}
}
// 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.
Attribute::~Attribute()
{
// The attribute id will be closed properly
try {
resetIdComponent( this ); }
catch (Exception close_error) { // thrown by p_close
throw AttributeIException("Attribute::~Attribute", close_error.getDetailMsg());
}
}
#ifndef H5_NO_NAMESPACE
} // end namespace
#endif
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