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// C++ informative line for the emacs editor: -*- C++ -*-
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* 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 COPYING file, which can be found at the root of the source code *
* distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases. *
* If you do not have access to either file, you may request a copy from *
* help@hdfgroup.org. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
#ifndef __H5Attribute_H
#define __H5Attribute_H
namespace H5 {
/*! \class Attribute
\brief Class Attribute operates on HDF5 attributes.
An attribute has many characteristics similar to a dataset, thus both
Attribute and DataSet are derivatives of AbstractDs. Attribute also
inherits from H5Location because an attribute can be used to specify
a location.
*/
// Inheritance: multiple H5Location/AbstractDs -> IdComponent
class H5_DLLCPP Attribute : public AbstractDs, public H5Location {
public:
// Copy constructor: same as the original Attribute.
Attribute(const Attribute& original);
// Default constructor
Attribute();
// Creates a copy of an existing attribute using the attribute id
Attribute(const hid_t attr_id);
// Closes this attribute.
virtual void close();
// Gets the name of this attribute.
ssize_t getName(char* attr_name, size_t buf_size = 0) const;
H5std_string getName(size_t len) const;
H5std_string getName() const;
ssize_t getName(H5std_string& attr_name, size_t len = 0) const;
// The overloaded function below is replaced by the one above and it
// is kept for backward compatibility purpose.
ssize_t getName(size_t buf_size, H5std_string& attr_name) const;
// Gets a copy of the dataspace for this attribute.
virtual DataSpace getSpace() const;
// Returns the amount of storage size required for this attribute.
virtual hsize_t getStorageSize() const;
// Returns the in memory size of this attribute's data.
virtual size_t getInMemDataSize() const;
// Reads data from this attribute.
void read(const DataType& mem_type, void *buf) const;
void read(const DataType& mem_type, H5std_string& strg) const;
// Writes data to this attribute.
void write(const DataType& mem_type, const void *buf) const;
void write(const DataType& mem_type, const H5std_string& strg) const;
///\brief Returns this class name.
virtual H5std_string fromClass () const { return("Attribute"); }
// Gets the attribute id.
virtual hid_t getId() const;
// Destructor: properly terminates access to this attribute.
virtual ~Attribute();
#ifndef DOXYGEN_SHOULD_SKIP_THIS
protected:
// Sets the attribute id.
virtual void p_setId(const hid_t new_id);
#endif // DOXYGEN_SHOULD_SKIP_THIS
private:
hid_t id; // HDF5 attribute id
// This function contains the common code that is used by
// getTypeClass and various API functions getXxxType
// defined in AbstractDs for generic datatype and specific
// sub-types
virtual hid_t p_get_type() const;
// Reads variable or fixed len strings from this attribute.
void p_read_variable_len(const DataType& mem_type, H5std_string& strg) const;
void p_read_fixed_len(const DataType& mem_type, H5std_string& strg) const;
// Friend function to set Attribute id. For library use only.
friend void f_Attribute_setId(Attribute* attr, hid_t new_id);
}; // end of Attribute
} // namespace H5
#endif // __H5Attribute_H