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// -*- C++ -*-
//
// Package: CondCore/CondHDF5ESSource
// Class : Attribute
//
// Implementation:
// [Notes on implementation]
//
// Original Author: Christopher Jones
// Created: Fri, 30 Jun 2023 15:26:38 GMT
//
// system include files
// user include files
#include "h5_Attribute.h"
#include "FWCore/Utilities/interface/Exception.h"
//
// constants, enums and typedefs
//
namespace cms::h5 {
//
// static data member definitions
//
//
// constructors and destructor
//
Attribute::Attribute(hid_t iParentID, std::string const& iName)
: id_(H5Aopen(iParentID, iName.c_str(), H5P_DEFAULT)) {
if (id_ < 1) {
throw cms::Exception("UnknownH5Attribute") << "unknown attribute " << iName;
}
}
// Attribute::Attribute(const Attribute& rhs)
// {
// // do actual copying here;
// }
Attribute::~Attribute() { H5Aclose(id_); }
//
// assignment operators
//
// const Attribute& Attribute::operator=(const Attribute& rhs)
// {
// //An exception safe implementation is
// Attribute temp(rhs);
// swap(rhs);
//
// return *this;
// }
//
// member functions
//
//
// const member functions
//
std::string Attribute::readString() const {
// Prepare and call C API to read attribute.
char* strg_C;
hid_t attr_type = H5Tcopy(H5T_C_S1);
(void)H5Tset_size(attr_type, H5T_VARIABLE);
// Read attribute, no allocation for variable-len string; C library will
herr_t ret_value = H5Aread(id_, attr_type, &strg_C);
H5Tclose(attr_type);
if (ret_value < 0) {
throw cms::Exception("H5AttributeReadStrinFailed") << " failed to read string from attribute";
}
// Get string from the C char* and release resource allocated by C API
std::string strg = strg_C;
free(strg_C);
return strg;
}
uint32_t Attribute::readUInt32() const {
unsigned int ret;
// Read attribute, no allocation for variable-len string; C library will
herr_t ret_value = H5Aread(id_, H5T_NATIVE_UINT, &ret);
if (ret_value < 0) {
throw cms::Exception("H5AttributeReadStrinFailed") << " failed to read unsigned int from attribute";
}
return ret;
}
//
// static member functions
//
} // namespace cms::h5
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