libhdf5-dev 1.8.16+docs-4ubuntu1 / usr / include / hdf5 / serial / H5Location.h

// C++ informative line for the emacs editor: -*- C++ -*-
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 * Copyright by The HDF Group.                                               *
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#ifndef __H5Location_H
#define __H5Location_H

#include "H5Classes.h"		// constains forward class declarations

#ifndef H5_NO_NAMESPACE
namespace H5 {
#endif

class H5_DLLCPP H5Location;  // forward declaration for UserData4Aiterate

// Define the operator function pointer for H5Aiterate().
typedef void (*attr_operator_t)( H5Location& loc/*in*/,
                                 const H5std_string attr_name/*in*/,
                                 void *operator_data/*in,out*/);

class UserData4Aiterate { // user data for attribute iteration
   public:
	attr_operator_t op;
	void* opData;
	H5Location* location;
};

/*! \class H5Location
    \brief H5Location is an abstract base class, added in version 1.8.12.

    It provides a collection of wrappers for the C functions that take a
    location identifier to specify the HDF5 object.  The location identifier
    can be either file, group, dataset, or named datatype.
*/
// Most of these methods were in H5Object but are now moved here because
// a location can be a file, group, dataset, or named datatype. -BMR, 2013-10-1
class H5_DLLCPP H5Location : public IdComponent {
   public:
	// Creates an attribute for the specified object at this location
	// PropList is currently not used, so always be default.
	Attribute createAttribute( const char* name, const DataType& type, const DataSpace& space, const PropList& create_plist = PropList::DEFAULT ) const;
	Attribute createAttribute( const H5std_string& name, const DataType& type, const DataSpace& space, const PropList& create_plist = PropList::DEFAULT ) const;

	// Given its name, opens the attribute that belongs to an object at
	// this location.
	Attribute openAttribute( const char* name ) const;
	Attribute openAttribute( const H5std_string& name ) const;

	// Given its index, opens the attribute that belongs to an object at
	// this location.
	Attribute openAttribute( const unsigned int idx ) const;

	// Flushes all buffers associated with this location to disk.
	void flush( H5F_scope_t scope ) const;

	// Gets the name of the file, specified by this location.
	H5std_string getFileName() const;

	// Determines the number of attributes at this location.
	int getNumAttrs() const;

#ifndef H5_NO_DEPRECATED_SYMBOLS
	// Retrieves the type of object that an object reference points to.
	H5G_obj_t getObjType(void *ref, H5R_type_t ref_type = H5R_OBJECT) const;
#endif /* H5_NO_DEPRECATED_SYMBOLS */

	// Retrieves the type of object that an object reference points to.
	H5O_type_t getRefObjType(void *ref, H5R_type_t ref_type = H5R_OBJECT) const;
	// Note: getRefObjType deprecates getObjType, but getObjType's name is
	// misleading, so getRefObjType is used in the new function instead.

	// Iterate user's function over the attributes at this location.
	int iterateAttrs(attr_operator_t user_op, unsigned* idx = NULL, void* op_data = NULL);

	// Checks whether the named attribute exists at this location.
	bool attrExists(const char* name) const;
	bool attrExists(const H5std_string& name) const;

	// Renames the named attribute to a new name.
	void renameAttr(const char* oldname, const char* newname) const;
	void renameAttr(const H5std_string& oldname, const H5std_string& newname) const;

	// Removes the named attribute from this location.
	void removeAttr(const char* name) const;
	void removeAttr(const H5std_string& name) const;

	// Sets the comment for an HDF5 object specified by its name.
	void setComment(const char* name, const char* comment) const;
	void setComment(const H5std_string& name, const H5std_string& comment) const;
	void setComment(const char* comment) const;
	void setComment(const H5std_string& comment) const;

	// Retrieves comment for the HDF5 object specified by its name.
	ssize_t getComment(const char* name, size_t buf_size, char* comment) const;
	H5std_string getComment(const char* name, size_t buf_size=0) const;
	H5std_string getComment(const H5std_string& name, size_t buf_size=0) const;

	// Removes the comment for the HDF5 object specified by its name.
	void removeComment(const char* name) const;
	void removeComment(const H5std_string& name) const;

	// Creates a reference to a named object or to a dataset region
	// in this object.
	void reference(void* ref, const char* name, 
			H5R_type_t ref_type = H5R_OBJECT) const;
	void reference(void* ref, const H5std_string& name, 
			H5R_type_t ref_type = H5R_OBJECT) const;
	void reference(void* ref, const char* name, const DataSpace& dataspace,
			H5R_type_t ref_type = H5R_DATASET_REGION) const;
	void reference(void* ref, const H5std_string& name, const DataSpace& dataspace,
			H5R_type_t ref_type = H5R_DATASET_REGION) const;

	// Open a referenced object whose location is specified by either
	// a file, an HDF5 object, or an attribute.
	void dereference(const H5Location& loc, const void* ref, H5R_type_t ref_type = H5R_OBJECT);
	void dereference(const Attribute& attr, const void* ref, H5R_type_t ref_type = H5R_OBJECT);

	// Retrieves a dataspace with the region pointed to selected.
	DataSpace getRegion(void *ref, H5R_type_t ref_type = H5R_DATASET_REGION) const;

	///\brief Returns an identifier. (pure virtual)
	virtual hid_t getId() const = 0;

   protected:
#ifndef DOXYGEN_SHOULD_SKIP_THIS
	// Default constructor,
	H5Location();

	// *** Deprecation warning ***
	// The following two constructors are no longer appropriate after the
	// data member "id" had been moved to the sub-classes.
	// The copy constructor is a noop and is removed in 1.8.15 and the
	// other will be removed from 1.10 release, and then from 1.8 if its
	// removal does not raise any problems in two 1.10 releases.

	// Creates a copy of an existing object giving the location id.
	H5Location(const hid_t loc_id);

	// Creates a reference to an HDF5 object or a dataset region.
	void p_reference(void* ref, const char* name, hid_t space_id, H5R_type_t ref_type) const;

	// Dereferences a ref into an HDF5 id.
	hid_t p_dereference(hid_t loc_id, const void* ref, H5R_type_t ref_type, const char* from_func);

#ifndef H5_NO_DEPRECATED_SYMBOLS
	// Retrieves the type of object that an object reference points to.
	H5G_obj_t p_get_obj_type(void *ref, H5R_type_t ref_type) const;
#endif /* H5_NO_DEPRECATED_SYMBOLS */

	// Retrieves the type of object that an object reference points to.
	H5O_type_t p_get_ref_obj_type(void *ref, H5R_type_t ref_type) const;

        // Sets the identifier of this object to a new value. - this one
        // doesn't increment reference count
        virtual void p_setId(const hid_t new_id) = 0;

#endif // DOXYGEN_SHOULD_SKIP_THIS

	// Noop destructor.
	virtual ~H5Location();

}; /* end class H5Location */

#ifndef H5_NO_NAMESPACE
}
#endif
#endif // __H5Location_H