H5Attribute.h

// 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 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.     *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

#ifndef _H5Attribute_H
#define _H5Attribute_H

#ifndef H5_NO_NAMESPACE
namespace H5 {
#endif

class H5_DLLCPP Attribute : public AbstractDs, public IdComponent {
   public:
        // Closes this attribute.
        virtual void close();

        // Gets the name of the file, in which this attribute belongs.
        H5std_string getFileName() const;

        // Gets the name of this attribute.
        ssize_t getName( size_t buf_size, H5std_string& attr_name ) const;
        H5std_string getName( size_t buf_size ) const; // returns name, not its length
        H5std_string getName() const; // returns name, no argument

        // 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;

        virtual H5std_string fromClass () const { return("Attribute"); }

        // Creates a copy of an existing attribute using the attribute id
        Attribute( const hid_t attr_id );

        // Copy constructor: makes a copy of an existing Attribute object.
        Attribute( const Attribute& original );

        // Default constructor
        Attribute();

        // Gets the attribute id.
        virtual hid_t getId() const;

        // Destructor: properly terminates access to this attribute.
        virtual ~Attribute();

   protected:
        // Sets the attribute id.
        virtual void p_setId(const hid_t new_id);

   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;

        // do not inherit H5Object::iterateAttrs
        int iterateAttrs() { return 0; }

        // do not inherit H5Object::renameAttr
        void renameAttr() {}
};
#ifndef H5_NO_NAMESPACE
}
#endif
#endif