H5Attribute.h

// C++ informative line for the emacs editor: -*- C++ -*-
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 * Copyright by The HDF Group.                                               *
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#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(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;

    // Flushes all buffers associated with the file specified by this
    // attribute to disk.
    void flush( H5F_scope_t scope ) 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 // __H5Attribute_H