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107 lines
4.0 KiB
C++
107 lines
4.0 KiB
C++
// C++ informative line for the emacs editor: -*- C++ -*-
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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
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* Copyright by The HDF Group. *
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* All rights reserved. *
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* *
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* This file is part of HDF5. The full HDF5 copyright notice, including *
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* terms governing use, modification, and redistribution, is contained in *
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* the COPYING file, which can be found at the root of the source code *
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* distribution tree, or in https://www.hdfgroup.org/licenses. *
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* If you do not have access to either file, you may request a copy from *
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* help@hdfgroup.org. *
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* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
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#ifndef H5Attribute_H
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#define H5Attribute_H
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namespace H5 {
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/*! \class Attribute
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\brief Class Attribute operates on HDF5 attributes.
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An attribute has many characteristics similar to a dataset, thus both
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Attribute and DataSet are derivatives of AbstractDs. Attribute also
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inherits from H5Location because an attribute can be used to specify
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a location.
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*/
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// Inheritance: multiple H5Location/AbstractDs -> IdComponent
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class H5_DLLCPP Attribute : public AbstractDs, public H5Location {
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public:
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// Copy constructor: same as the original Attribute.
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Attribute(const Attribute &original);
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// Default constructor
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Attribute();
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// Creates a copy of an existing attribute using the attribute id
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Attribute(const hid_t attr_id);
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// Closes this attribute.
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virtual void close() override;
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// Gets the name of this attribute.
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ssize_t getName(char *attr_name, size_t buf_size = 0) const;
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H5std_string getName(size_t len) const;
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H5std_string getName() const;
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ssize_t getName(H5std_string &attr_name, size_t len = 0) const;
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// The overloaded function below is replaced by the one above and it
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// is kept for backward compatibility purpose.
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ssize_t getName(size_t buf_size, H5std_string &attr_name) const;
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// Gets a copy of the dataspace for this attribute.
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virtual DataSpace getSpace() const override;
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// Returns the amount of storage size required for this attribute.
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virtual hsize_t getStorageSize() const override;
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// Returns the in memory size of this attribute's data.
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virtual size_t getInMemDataSize() const override;
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// Reads data from this attribute.
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void read(const DataType &mem_type, void *buf) const;
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void read(const DataType &mem_type, H5std_string &strg) const;
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// Writes data to this attribute.
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void write(const DataType &mem_type, const void *buf) const;
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void write(const DataType &mem_type, const H5std_string &strg) const;
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///\brief Returns this class name.
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virtual H5std_string
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fromClass() const override
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{
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return ("Attribute");
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}
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// Gets the attribute id.
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virtual hid_t getId() const override;
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// Destructor: properly terminates access to this attribute.
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virtual ~Attribute() override;
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#ifndef DOXYGEN_SHOULD_SKIP_THIS
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protected:
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// Sets the attribute id.
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virtual void p_setId(const hid_t new_id) override;
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#endif // DOXYGEN_SHOULD_SKIP_THIS
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private:
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hid_t id; // HDF5 attribute id
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// This function contains the common code that is used by
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// getTypeClass and various API functions getXxxType
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// defined in AbstractDs for generic datatype and specific
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// sub-types
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virtual hid_t p_get_type() const override;
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// Reads variable or fixed len strings from this attribute.
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void p_read_variable_len(const DataType &mem_type, H5std_string &strg) const;
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void p_read_fixed_len(const DataType &mem_type, H5std_string &strg) const;
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// Friend function to set Attribute id. For library use only.
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friend void f_Attribute_setId(Attribute *attr, hid_t new_id);
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}; // end of Attribute
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} // namespace H5
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#endif // H5Attribute_H
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