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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Copyright by The HDF Group. *
* 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://hdfgroup.org/HDF5/doc/Copyright.html. If you do not have *
* access to either file, you may request a copy from help@hdfgroup.org. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
#ifdef OLD_HEADER_FILENAME
#include <iostream.h>
#else
#include <iostream>
#endif
#include <string>
#include "H5Include.h"
#include "H5Exception.h"
#include "H5IdComponent.h"
#include "H5PropList.h"
#include "H5Object.h"
#include "H5AbstractDs.h"
#include "H5FaccProp.h"
#include "H5FcreatProp.h"
#include "H5DcreatProp.h"
#include "H5CommonFG.h"
#include "H5DataType.h"
#include "H5DataSpace.h"
#include "H5File.h"
#include "H5Attribute.h"
#include "H5private.h" // for HDfree
#ifndef H5_NO_NAMESPACE
namespace H5 {
#ifndef H5_NO_STD
using std::cerr;
using std::endl;
#endif // H5_NO_STD
#endif
//--------------------------------------------------------------------------
// Function: Attribute default constructor
///\brief Default constructor: Creates a stub attribute
// Programmer Binh-Minh Ribler - May, 2004
//--------------------------------------------------------------------------
Attribute::Attribute() : AbstractDs(), IdComponent(), id(0) {}
//--------------------------------------------------------------------------
// Function: Attribute copy constructor
///\brief Copy constructor: makes a copy of the original Attribute object.
///\param original - IN: Original Attribute object to copy
// Programmer Binh-Minh Ribler - 2000
//--------------------------------------------------------------------------
Attribute::Attribute(const Attribute& original) : AbstractDs(), IdComponent()
{
id = original.getId();
incRefCount(); // increment number of references to this id
}
//--------------------------------------------------------------------------
// Function: Attribute overloaded constructor
///\brief Creates an Attribute object using the id of an existing
/// attribute.
///\param existing_id - IN: Id of an existing attribute
///\exception H5::AttributeIException
// Programmer Binh-Minh Ribler - 2000
//--------------------------------------------------------------------------
Attribute::Attribute(const hid_t existing_id) : AbstractDs(), IdComponent()
{
id = existing_id;
}
//--------------------------------------------------------------------------
// Function: Attribute::write
///\brief Writes data to this attribute.
///\param mem_type - IN: Attribute datatype (in memory)
///\param buf - IN: Data to be written
///\exception H5::AttributeIException
// Programmer Binh-Minh Ribler - 2000
//--------------------------------------------------------------------------
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");
}
}
//--------------------------------------------------------------------------
// Function: Attribute::write
///\brief This is an overloaded member function, provided for convenience.
/// It writes a \a H5std_string to this attribute.
///\param mem_type - IN: Attribute datatype (in memory)
///\param strg - IN: Data to be written
///\exception H5::AttributeIException
// Programmer Binh-Minh Ribler - Apr, 2003
//--------------------------------------------------------------------------
void Attribute::write(const DataType& mem_type, const H5std_string& strg) const
{
// Check if this attribute has variable-len string or fixed-len string and
// proceed appropriately.
htri_t is_variable_len = H5Tis_variable_str(mem_type.getId());
if (is_variable_len < 0)
{
throw AttributeIException("Attribute::write", "H5Tis_variable_str failed");
}
// Convert string to C-string
const char* strg_C;
strg_C = strg.c_str(); // strg_C refers to the contents of strg as a C-str
herr_t ret_value = 0;
// Pass string in differently depends on variable or fixed length
if (!is_variable_len)
{
ret_value = H5Awrite(id, mem_type.getId(), strg_C);
}
else
{
// passing third argument by address
ret_value = H5Awrite(id, mem_type.getId(), &strg_C);
}
if (ret_value < 0)
{
throw AttributeIException("Attribute::write", "H5Awrite failed");
}
}
//--------------------------------------------------------------------------
// Function: Attribute::read
///\brief Reads data from this attribute.
///\param mem_type - IN: Attribute datatype (in memory)
///\param buf - OUT: Buffer for read data
///\exception H5::AttributeIException
// Programmer Binh-Minh Ribler - 2000
//--------------------------------------------------------------------------
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");
}
}
//--------------------------------------------------------------------------
// Function: Attribute::read
///\brief This is an overloaded member function, provided for convenience.
/// It reads a \a H5std_string from this attribute.
///\param mem_type - IN: Attribute datatype (in memory)
///\param strg - IN: Buffer for read string
///\exception H5::AttributeIException
// Programmer Binh-Minh Ribler - Apr, 2003
// Modification
// Mar 2008
// Corrected a misunderstanding that H5Aread would allocate
// space for the buffer. Obtained the attribute size and
// allocated memory properly. - BMR
//--------------------------------------------------------------------------
void Attribute::read( const DataType& mem_type, H5std_string& strg ) const
{
// Get the size of the attribute data.
hsize_t attr_size = H5Aget_storage_size(id);
if (attr_size <= 0)
{
throw AttributeIException("Attribute::read", "Unable to get attribute size before reading");
}
// Check if this attribute has variable-len string or fixed-len string and
// proceed appropriately.
htri_t is_variable_len = H5Tis_variable_str(mem_type.getId());
if (is_variable_len < 0)
{
throw AttributeIException("Attribute::write", "H5Tis_variable_str failed");
}
// Prepare and call C API to read attribute.
char *strg_C;
herr_t ret_value = 0;
if (!is_variable_len) // only allocate for fixed-len string
{
strg_C = new char [(size_t)attr_size+1];
if (strg_C == NULL)
{
throw AttributeIException("Attribute::read", "Unable to allocate buffer to read the attribute");
}
ret_value = H5Aread(id, mem_type.getId(), strg_C);
}
else
{
// no allocation for variable-len string; C library will
ret_value = H5Aread(id, mem_type.getId(), &strg_C);
}
if( ret_value < 0 )
{
if (!is_variable_len) // only de-allocate for fixed-len string
delete []strg_C;
throw AttributeIException("Attribute::read", "H5Aread failed");
}
// Get string from the C char* and release resource allocated locally
if (!is_variable_len)
{
strg_C[attr_size] = '\0';
strg = strg_C;
delete []strg_C;
}
// Get string from the C char* and release resource allocated by C API
else
{
strg = strg_C;
HDfree(strg_C);
}
}
//--------------------------------------------------------------------------
// Function: Attribute::getSpace
///\brief Gets a copy of the dataspace for this attribute.
///\return Dataspace instance
///\exception H5::AttributeIException
// Programmer Binh-Minh Ribler - 2000
//--------------------------------------------------------------------------
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");
}
}
//--------------------------------------------------------------------------
// Function: Attribute::p_get_type (private)
// Purpose Gets the datatype of this attribute.
// Return Id of the datatype
// Exception H5::AttributeIException
// Description
// This private function is used in AbstractDs.
// Programmer Binh-Minh Ribler - 2000
//--------------------------------------------------------------------------
hid_t Attribute::p_get_type() const
{
hid_t type_id = H5Aget_type( id );
if( type_id > 0 )
return( type_id );
else
{
throw AttributeIException("", "H5Aget_type failed");
}
}
//--------------------------------------------------------------------------
// Function: Attribute::getFileName
///\brief Gets the name of the file, in which this attribute belongs.
///\return File name
///\exception H5::IdComponentException
// Programmer Binh-Minh Ribler - Jul, 2004
//--------------------------------------------------------------------------
H5std_string Attribute::getFileName() const
{
try {
return(p_get_file_name());
}
catch (IdComponentException E) {
throw FileIException("Attribute::getFileName", E.getDetailMsg());
}
}
//--------------------------------------------------------------------------
// Function: Attribute::getName
///\brief Gets the name of this attribute, returning its length.
///\param buf_size - IN: Desired length of the name
///\param attr_name - OUT: Buffer for the name string
///\return Length of the attribute name
///\exception H5::AttributeIException
// Programmer Binh-Minh Ribler - Nov, 2001
//--------------------------------------------------------------------------
ssize_t Attribute::getName( size_t buf_size, H5std_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 attribute name and return
attr_name = name_C;
delete []name_C;
return( name_size );
}
//--------------------------------------------------------------------------
// Function: Attribute::getName
///\brief This is an overloaded member function, provided for convenience.
/// It differs from the above function in that it returns the
/// attribute's name, not the length.
///\return Name of the attribute
///\param buf_size - IN: Desired length of the name
///\exception H5::AttributeIException
// Programmer Binh-Minh Ribler - 2000
//--------------------------------------------------------------------------
H5std_string Attribute::getName( size_t buf_size ) const
{
H5std_string attr_name;
ssize_t name_size = getName( buf_size, attr_name );
return( attr_name );
// let caller catch exception if any
}
//--------------------------------------------------------------------------
// Function: Attribute::getName
///\brief This is an overloaded member function, provided for convenience.
/// It differs from the above functions in that it doesn't take
/// any arguments and returns the attribute's name.
///\return Name of the attribute
///\exception H5::AttributeIException
// Programmer Binh-Minh Ribler - May, 2004
//--------------------------------------------------------------------------
H5std_string Attribute::getName() const
{
// Try with 256 characters for the name first, if the name's length
// returned is more than that then, read the name again with the
// appropriate space allocation
char* name_C = new char[256]; // temporary C-string for C API
ssize_t name_size = H5Aget_name(id, 255, name_C);
H5std_string attr_name;
if (name_size >= 256)
name_size = getName(name_size, attr_name);
// otherwise, convert the C attribute name and return
else
attr_name = name_C;
delete []name_C;
return( attr_name );
}
//--------------------------------------------------------------------------
// Function: Attribute::getStorageSize
///\brief Returns the amount of storage size required for this attribute.
///\return Size of the storage or 0, for no data
///\exception H5::AttributeIException
// Note: H5Dget_storage_size returns 0 when there is no data. This
// function should have no failure. (from SLU)
// Programmer Binh-Minh Ribler - Mar, 2005
//--------------------------------------------------------------------------
hsize_t Attribute::getStorageSize() const
{
hsize_t storage_size = H5Aget_storage_size(id);
return (storage_size);
}
//--------------------------------------------------------------------------
// Function: Attribute::getId
// Purpose: Get the id of this attribute
// Description:
// Class hierarchy is revised to address bugzilla 1068. Class
// AbstractDS and Attribute are moved out of H5Object. In
// addition, member IdComponent::id is moved into subclasses, and
// IdComponent::getId now becomes pure virtual function.
// Programmer Binh-Minh Ribler - May, 2008
//--------------------------------------------------------------------------
hid_t Attribute::getId() const
{
return(id);
}
//--------------------------------------------------------------------------
// Function: Attribute::p_setId
///\brief Sets the identifier of this object to a new value.
///
///\exception H5::IdComponentException when the attempt to close the HDF5
/// object fails
// Description:
// The underlaying reference counting in the C library ensures
// that the current valid id of this object is properly closed.
// Then the object's id is reset to the new id.
// Programmer Binh-Minh Ribler - 2000
//--------------------------------------------------------------------------
void Attribute::p_setId(const hid_t new_id)
{
// handling references to this old id
try {
close();
}
catch (Exception close_error) {
throw AttributeIException("Attribute::p_setId", close_error.getDetailMsg());
}
// reset object's id to the given id
id = new_id;
}
//--------------------------------------------------------------------------
// Function: Attribute::close
///\brief Closes this attribute.
///
///\exception H5::AttributeIException
// Programmer Binh-Minh Ribler - Mar 9, 2005
//--------------------------------------------------------------------------
void Attribute::close()
{
if (p_valid_id(id))
{
herr_t ret_value = H5Aclose(id);
if( ret_value < 0 )
{
throw AttributeIException("Attribute::close", "H5Aclose failed");
}
// reset the id when the attribute that it represents is no longer
// referenced
if (getCounter() == 0)
id = 0;
}
}
//--------------------------------------------------------------------------
// Function: Attribute destructor
///\brief Properly terminates access to this attribute.
// Programmer Binh-Minh Ribler - 2000
// Modification
// - Replaced resetIdComponent() with decRefCount() to use C
// library ID reference counting mechanism - BMR, Jun 1, 2004
// - Replaced decRefCount with close() to let the C library
// handle the reference counting - BMR, Jun 1, 2006
//--------------------------------------------------------------------------
Attribute::~Attribute()
{
try {
close();
}
catch (Exception close_error) {
cerr << "Attribute::~Attribute - " << close_error.getDetailMsg() << endl;
}
}
#ifndef H5_NO_NAMESPACE
} // end namespace
#endif
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