summaryrefslogtreecommitdiffstats
path: root/c++/src/H5IdComponent.cpp
blob: 03c7809dcc77fe839010859e50fbbe80899a58d5 (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
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * 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://hdf.ncsa.uiuc.edu/HDF5/doc/Copyright.html.  If you do not have     *
 * access to either file, you may request a copy from hdfhelp@ncsa.uiuc.edu. *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
#ifdef H5_VMS
#include <iostream>
#endif /*H5_VMS*/

#include <string>

#include "H5Include.h"
#include "H5Exception.h"
#include "H5Library.h"
#include "H5IdComponent.h"

#ifndef H5_NO_NAMESPACE
namespace H5 {
#endif

//--------------------------------------------------------------------------
// Function:	IdComponent overloaded constructor
///\brief	Creates an IdComponent object using the id of an existing object.
///\param	h5_id - IN: Id of an existing object
///\exception	H5::DataTypeIException
// Programmer	Binh-Minh Ribler - 2000
//--------------------------------------------------------------------------
IdComponent::IdComponent(const hid_t h5_id) : id(h5_id) {}

//--------------------------------------------------------------------------
// Function:	IdComponent copy constructor
///\brief	Copy constructor: makes a copy of the original IdComponent object.
///\param	original - IN: IdComponent instance to copy
// Programmer	Binh-Minh Ribler - 2000
//--------------------------------------------------------------------------
IdComponent::IdComponent( const IdComponent& original )
{
    id = original.id;
    incRefCount(); // increment number of references to this id
}

//--------------------------------------------------------------------------
// Function:	IdComponent::incRefCount
///\brief	Increment reference counter for a given id.
// Programmer	Binh-Minh Ribler - May 2005
//--------------------------------------------------------------------------
void IdComponent::incRefCount(const hid_t obj_id) const
{
    if (p_valid_id(obj_id))
	if (H5Iinc_ref(obj_id) < 0)
	    throw IdComponentException(inMemFunc("incRefCount"), "incrementing object ref count failed");
}

//--------------------------------------------------------------------------
// Function:	IdComponent::incRefCount
///\brief	Increment reference counter for the id of this object.
// Programmer	Binh-Minh Ribler - 2000
//--------------------------------------------------------------------------
void IdComponent::incRefCount() const
{
    incRefCount(id);
}

//--------------------------------------------------------------------------
// Function:	IdComponent::decRefCount
///\brief	Decrement reference counter for a given id.
// Programmer	Binh-Minh Ribler - May 2005
// Modification:
//		Added the check for ref counter to give a little more info
//		on why H5Idec_ref fails in some cases - BMR 5/19/2005
//--------------------------------------------------------------------------
void IdComponent::decRefCount(const hid_t obj_id) const
{
    if (p_valid_id(obj_id))
	if (H5Idec_ref(obj_id) < 0)
	    if (H5Iget_ref(obj_id) <= 0)
		throw IdComponentException(inMemFunc("decRefCount"),
					"object ref count is 0 or negative");
	    else
		throw IdComponentException(inMemFunc("decRefCount"),
					"decrementing object ref count failed");
}

//--------------------------------------------------------------------------
// Function:	IdComponent::decRefCount
///\brief	Decrement reference counter for the id of this object.
// Programmer	Binh-Minh Ribler - 2000
//--------------------------------------------------------------------------
void IdComponent::decRefCount() const
{
    decRefCount(id);
}

//--------------------------------------------------------------------------
// Function:	IdComponent::getCounter
///\brief	Returns the reference counter for a given id.
///\return	Reference count
// Programmer	Binh-Minh Ribler - May 2005
//--------------------------------------------------------------------------
int IdComponent::getCounter(const hid_t obj_id) const
{
    int counter = 0;
    if (p_valid_id(obj_id))
    {
	counter = H5Iget_ref(obj_id);
	if (counter < 0)
	    throw IdComponentException(inMemFunc("incRefCount"), "getting object ref count failed - negative");
    }
    return (counter);
}

//--------------------------------------------------------------------------
// Function:	IdComponent::getCounter
///\brief	Returns the reference counter for the id of this object.
///\return	Reference count
// Programmer	Binh-Minh Ribler - 2000
//--------------------------------------------------------------------------
int IdComponent::getCounter() const
{
    return (getCounter(id));
}

//--------------------------------------------------------------------------
// Function:	hdfObjectType
///\brief	Given an id, returns the type of the object.
///return	a valid HDF object type, which may be one of the following:
///		\li \c H5I_FILE
///		\li \c H5I_GROUP
///		\li \c H5I_DATATYPE
///		\li \c H5I_DATASPACE
///		\li \c H5I_DATASET
///		\li \c H5I_ATTR
///		\li or \c H5I_BADID, if no valid type can be determined or the
///				input object id is invalid.
// Programmer   Binh-Minh Ribler - Jul, 2005
//--------------------------------------------------------------------------
H5I_type_t IdComponent::getHDFObjType(const hid_t obj_id)
{
    H5I_type_t id_type = H5Iget_type(obj_id);
    if (id_type <= H5I_BADID || id_type >= H5I_NTYPES)
	return H5I_BADID; // invalid
    else
	return id_type; // valid type
}

//--------------------------------------------------------------------------
// Function:	IdComponent::operator=
///\brief	Assignment operator.
///\param	rhs - IN: Reference to the existing object
///\return	Reference to IdComponent instance
///\exception	H5::IdComponentException when attempt to close the HDF5
///		object fails
// Description
//		First, close the current valid id of this object.  Then
//		copy the id from rhs to this object, and increment the
//		reference counter of the id to indicate that another object
//		is referencing that id.
// Programmer	Binh-Minh Ribler - 2000
//--------------------------------------------------------------------------
IdComponent& IdComponent::operator=( const IdComponent& rhs )
{
    if (this != &rhs)
    {
	// handling references to this id
	try {
	    close();
	}
	catch (Exception close_error) {
	    throw FileIException(inMemFunc("operator="), close_error.getDetailMsg());
	}

	// copy the data members from the rhs object
	id = rhs.id;

	// increment the reference counter
	incRefCount();
    }
    return *this;
}

//--------------------------------------------------------------------------
// Function:	IdComponent::setId
///\brief	Sets the identifier of this object to a new value.
///
///\exception	H5::IdComponentException when the attempt to close the HDF5
///		object fails
// Description:
// 		The underlaying reference counting in the C library ensures
// 		that the current valid id of this object is properly closed.
// 		Then the object's id is reset to the new id.
// Programmer	Binh-Minh Ribler - 2000
//--------------------------------------------------------------------------
void IdComponent::setId(const hid_t new_id)
{
    // handling references to this old id
    try {
	close();
    }
    catch (Exception close_error) {
	throw IdComponentException(inMemFunc("copy"), close_error.getDetailMsg());
    }

   // reset object's id to the given id
   id = new_id;

   // increment the reference counter of the new id
   incRefCount();
}

//--------------------------------------------------------------------------
// Function:	IdComponent::getId
///\brief	Returns the id of this object
///\return	HDF5 id
// Programmer	Binh-Minh Ribler - 2000
//--------------------------------------------------------------------------
hid_t IdComponent::getId () const
{
   return(id);
}

//--------------------------------------------------------------------------
// Function:	IdComponent destructor
///\brief	Noop destructor.
// Programmer	Binh-Minh Ribler - 2000
//--------------------------------------------------------------------------
IdComponent::~IdComponent() {}

//
// Implementation of protected functions for HDF5 Reference Interface
// and miscelaneous helpers.
//

#ifndef DOXYGEN_SHOULD_SKIP_THIS
//--------------------------------------------------------------------------
// Function:	IdComponent::inMemFunc
///\brief	Makes and returns string "<class-name>::<func_name>"
///\param	func_name - Name of the function where failure occurs
// Description
///		Concatenates the class name of this object with the
///		passed-in function name to create a string that indicates
///		where the failure occurs.  The class-name is provided by
///		fromClass().  This string will be used by a base class when
///		an exception is thrown.
// Programmer	Binh-Minh Ribler - Aug 6, 2005
//--------------------------------------------------------------------------
H5std_string IdComponent::inMemFunc(const char* func_name) const
{
#ifdef H5_VMS
   H5std_string full_name = fromClass();
   full_name.append("::");
   full_name.append(func_name);
#else
   H5std_string full_name = func_name;
   full_name.insert(0, "::");
   full_name.insert(0, fromClass());
#endif /*H5_VMS*/
   return (full_name);
}

//--------------------------------------------------------------------------
// Function:	IdComponent default constructor - private
///\brief	Default constructor.
// Programmer	Binh-Minh Ribler - 2000
//--------------------------------------------------------------------------
IdComponent::IdComponent() : id(-1) {}

//--------------------------------------------------------------------------
// Function:	IdComponent::p_get_file_name (protected)
// Purpose:	Gets the name of the file, in which this object belongs.
// Exception:	H5::IdComponentException
// Description:
// 		This function is protected so that the user applications can
// 		only have access to its code via allowable classes, namely,
// 		H5File and H5Object subclasses.
// Programmer	Binh-Minh Ribler - Jul, 2004
//--------------------------------------------------------------------------
H5std_string IdComponent::p_get_file_name() const
{
   // Preliminary call to H5Fget_name to get the length of the file name
   ssize_t name_size = H5Fget_name(id, NULL, 0);

   // If H5Aget_name returns a negative value, raise an exception,
   if( name_size < 0 )
   {
      throw IdComponentException("", "H5Fget_name failed");
   }

   // Call H5Fget_name again to get the actual file name
   char* name_C = new char[name_size+1];  // temporary C-string for C API
   name_size = H5Fget_name(id, name_C, name_size+1);

   // Check for failure again
   if( name_size < 0 )
   {
      throw IdComponentException("", "H5Fget_name failed");
   }

   // Convert the C file name and return
   H5std_string file_name(name_C);
   delete []name_C;
   return(file_name);
}

//--------------------------------------------------------------------------
// Function:	IdComponent::p_reference (protected)
// Purpose	Creates a reference to an HDF5 object or a dataset region.
// Parameters
//		name - IN: Name of the object to be referenced
//		dataspace - IN: Dataspace with selection
//		ref_type - IN: Type of reference; default to \c H5R_DATASET_REGION
// Return	A reference
// Exception	H5::IdComponentException
// Programmer	Binh-Minh Ribler - May, 2004
//--------------------------------------------------------------------------
void* IdComponent::p_reference(const char* name, hid_t space_id, H5R_type_t ref_type) const
{
   void *ref=NULL;
   herr_t ret_value = H5Rcreate(ref, id, name, ref_type, space_id);
   if (ret_value < 0)
   {
      throw IdComponentException("", "H5Rcreate failed");
   }
   return(ref);
}

//--------------------------------------------------------------------------
// Function:	IdComponent::p_get_obj_type (protected)
// Purpose	Retrieves the type of object that an object reference points to.
// Parameters
//		ref      - IN: Reference to query
//		ref_type - IN: Type of reference to query
// Return	An object type, which can be one of the following:
//			H5G_LINK Object is a symbolic link.
//			H5G_GROUP Object is a group.
//			H5G_DATASET   Object is a dataset.
//			H5G_TYPE Object is a named datatype
// Exception	H5::IdComponentException
// Programmer	Binh-Minh Ribler - May, 2004
//--------------------------------------------------------------------------
H5G_obj_t IdComponent::p_get_obj_type(void *ref, H5R_type_t ref_type) const
{
   H5G_obj_t obj_type = H5Rget_obj_type(id, ref_type, ref);
   if (obj_type == H5G_UNKNOWN)
   {
      throw IdComponentException("", "H5R_get_obj_type failed");
   }
   return(obj_type);
}

//--------------------------------------------------------------------------
// Function:	IdComponent::p_get_region (protected)
// Purpose	Retrieves a dataspace with the region pointed to selected.
// Parameters
//		ref_type - IN: Type of reference to get region of - default
//				to H5R_DATASET_REGION
//		ref      - IN: Reference to get region of
// Return	Dataspace id
// Exception	H5::IdComponentException
// Programmer	Binh-Minh Ribler - May, 2004
//--------------------------------------------------------------------------
hid_t IdComponent::p_get_region(void *ref, H5R_type_t ref_type) const
{
   hid_t space_id = H5Rget_region(id, ref_type, ref);
   if (space_id < 0)
   {
      throw IdComponentException("", "H5Rget_region failed");
   }
   return(space_id);
}

//
// Local functions used in this class
//

//--------------------------------------------------------------------------
// Function:	p_valid_id
// Purpose:	Verifies that the given id is a valid id so it can be passed
//		into an H5I C function.
// Return	true if id is valid, false, otherwise
// Programmer	Binh-Minh Ribler - May, 2005
//--------------------------------------------------------------------------
bool IdComponent::p_valid_id(const hid_t obj_id) const
{
    H5I_type_t id_type = H5Iget_type(obj_id);
    if (id_type <= H5I_BADID || id_type >= H5I_NTYPES)
	return false;
    else
	return true;
}
#endif // DOXYGEN_SHOULD_SKIP_THIS

#ifndef H5_NO_NAMESPACE
}
#endif