summaryrefslogtreecommitdiffstats
path: root/c++/src/H5Location.h
blob: 9e4ec0569d437b8c27e6aa4fa834ad74db7df31d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
// 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 __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*/);

//! User data for attribute iteration
class UserData4Aiterate {
   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, const PropList& plist = PropList::DEFAULT);
	void dereference(const Attribute& attr, const void* ref, H5R_type_t ref_type = H5R_OBJECT, const PropList& plist = PropList::DEFAULT);

	// 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:
	// Default constructor
	H5Location();

#ifndef DOXYGEN_SHOULD_SKIP_THIS

	// *** 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 PropList& plist, 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