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
|
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* 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 COPYING file, which can be found at the root of the source code *
* distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases. *
* If you do not have access to either file, you may request a copy from *
* help@hdfgroup.org. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/************************************************************
This example shows how to create and extend an unlimited
dataset. The program first writes integers to a dataset
with dataspace dimensions of DIM_XxDIM_Y, then closes the
file. Next, it reopens the file, reads back the data,
outputs it to the screen, extends the dataset, and writes
new data to the entire extended dataset. Finally it
reopens the file again, reads back the data, and utputs it
to the screen.
************************************************************/
package examples.datasets;
import hdf.hdf5lib.H5;
import hdf.hdf5lib.HDF5Constants;
public class H5Ex_D_UnlimitedMod {
private static String FILENAME = "H5Ex_D_UnlimitedMod.h5";
private static String DATASETNAME = "DS1";
private static final int DIM_X = 4;
private static final int DIM_Y = 7;
private static final int EDIM_X = 6;
private static final int EDIM_Y = 10;
private static final int CHUNK_X = 4;
private static final int CHUNK_Y = 4;
private static final int RANK = 2;
private static final int NDIMS = 2;
private static void writeUnlimited() {
long file_id = -1;
long dcpl_id = -1;
long dataspace_id = -1;
long dataset_id = -1;
long[] dims = { DIM_X, DIM_Y };
long[] chunk_dims = { CHUNK_X, CHUNK_Y };
long[] maxdims = { HDF5Constants.H5S_UNLIMITED, HDF5Constants.H5S_UNLIMITED };
int[][] dset_data = new int[DIM_X][DIM_Y];
// Initialize the dataset.
for (int indx = 0; indx < DIM_X; indx++)
for (int jndx = 0; jndx < DIM_Y; jndx++)
dset_data[indx][jndx] = indx * jndx - jndx;
// Create a new file using default properties.
try {
file_id = H5.H5Fcreate(FILENAME, HDF5Constants.H5F_ACC_TRUNC, HDF5Constants.H5P_DEFAULT,
HDF5Constants.H5P_DEFAULT);
}
catch (Exception e) {
e.printStackTrace();
}
// Create dataspace with unlimited dimensions.
try {
dataspace_id = H5.H5Screate_simple(RANK, dims, maxdims);
}
catch (Exception e) {
e.printStackTrace();
}
// Create the dataset creation property list.
try {
dcpl_id = H5.H5Pcreate(HDF5Constants.H5P_DATASET_CREATE);
}
catch (Exception e) {
e.printStackTrace();
}
// Set the chunk size.
try {
if (dcpl_id >= 0)
H5.H5Pset_chunk(dcpl_id, NDIMS, chunk_dims);
}
catch (Exception e) {
e.printStackTrace();
}
// Create the unlimited dataset.
try {
if ((file_id >= 0) && (dataspace_id >= 0) && (dcpl_id >= 0))
dataset_id = H5.H5Dcreate(file_id, DATASETNAME, HDF5Constants.H5T_STD_I32LE, dataspace_id,
HDF5Constants.H5P_DEFAULT, dcpl_id, HDF5Constants.H5P_DEFAULT);
}
catch (Exception e) {
e.printStackTrace();
}
// Write the data to the dataset.
try {
if (dataset_id >= 0)
H5.H5Dwrite(dataset_id, HDF5Constants.H5T_NATIVE_INT, HDF5Constants.H5S_ALL, HDF5Constants.H5S_ALL,
HDF5Constants.H5P_DEFAULT, dset_data);
}
catch (Exception e) {
e.printStackTrace();
}
// End access to the dataset and release resources used by it.
try {
if (dataset_id >= 0)
H5.H5Dclose(dataset_id);
}
catch (Exception e) {
e.printStackTrace();
}
try {
if (dataspace_id >= 0)
H5.H5Sclose(dataspace_id);
}
catch (Exception e) {
e.printStackTrace();
}
try {
if (dcpl_id >= 0)
H5.H5Pclose(dcpl_id);
}
catch (Exception e) {
e.printStackTrace();
}
// Close the file.
try {
if (file_id >= 0)
H5.H5Fclose(file_id);
}
catch (Exception e) {
e.printStackTrace();
}
}
private static void extendUnlimited() {
long file_id = -1;
long dataspace_id = -1;
long dataset_id = -1;
long[] dims = { DIM_X, DIM_Y };
long[] extdims = { EDIM_X, EDIM_Y };
int[][] dset_data;
int[][] extend_dset_data = new int[EDIM_X][EDIM_Y];
// Open an existing file.
try {
file_id = H5.H5Fopen(FILENAME, HDF5Constants.H5F_ACC_RDWR, HDF5Constants.H5P_DEFAULT);
}
catch (Exception e) {
e.printStackTrace();
}
// Open an existing dataset.
try {
if (file_id >= 0)
dataset_id = H5.H5Dopen(file_id, DATASETNAME, HDF5Constants.H5P_DEFAULT);
}
catch (Exception e) {
e.printStackTrace();
}
// Get dataspace and allocate memory for read buffer. This is a
// two dimensional dataset so the dynamic allocation must be done
// in steps.
try {
if (dataset_id >= 0)
dataspace_id = H5.H5Dget_space(dataset_id);
}
catch (Exception e) {
e.printStackTrace();
}
try {
if (dataspace_id >= 0)
H5.H5Sget_simple_extent_dims(dataspace_id, dims, null);
}
catch (Exception e) {
e.printStackTrace();
}
// Allocate array of pointers to rows.
dset_data = new int[(int) dims[0]][(int) dims[1]];
// Read the data using the default properties.
try {
if (dataset_id >= 0)
H5.H5Dread(dataset_id, HDF5Constants.H5T_NATIVE_INT, HDF5Constants.H5S_ALL, HDF5Constants.H5S_ALL,
HDF5Constants.H5P_DEFAULT, dset_data);
}
catch (Exception e) {
e.printStackTrace();
}
// Output the data to the screen.
System.out.println("Dataset before extension:");
for (int indx = 0; indx < DIM_X; indx++) {
System.out.print(" [ ");
for (int jndx = 0; jndx < DIM_Y; jndx++)
System.out.print(dset_data[indx][jndx] + " ");
System.out.println("]");
}
System.out.println();
try {
if (dataspace_id >= 0)
H5.H5Sclose(dataspace_id);
}
catch (Exception e) {
e.printStackTrace();
}
// Extend the dataset.
try {
if (dataset_id >= 0)
H5.H5Dset_extent(dataset_id, extdims);
}
catch (Exception e) {
e.printStackTrace();
}
// Retrieve the dataspace for the newly extended dataset.
try {
if (dataset_id >= 0)
dataspace_id = H5.H5Dget_space(dataset_id);
}
catch (Exception e) {
e.printStackTrace();
}
// Initialize data for writing to the extended dataset.
for (int indx = 0; indx < EDIM_X; indx++)
for (int jndx = 0; jndx < EDIM_Y; jndx++)
extend_dset_data[indx][jndx] = jndx;
// Write the data tto the extended dataset.
try {
if ((dataspace_id >= 0) && (dataset_id >= 0))
H5.H5Dwrite(dataset_id, HDF5Constants.H5T_NATIVE_INT, HDF5Constants.H5S_ALL, dataspace_id,
HDF5Constants.H5P_DEFAULT, extend_dset_data);
}
catch (Exception e) {
e.printStackTrace();
}
// End access to the dataset and release resources used by it.
try {
if (dataset_id >= 0)
H5.H5Dclose(dataset_id);
}
catch (Exception e) {
e.printStackTrace();
}
try {
if (dataspace_id >= 0)
H5.H5Sclose(dataspace_id);
}
catch (Exception e) {
e.printStackTrace();
}
// Close the file.
try {
if (file_id >= 0)
H5.H5Fclose(file_id);
}
catch (Exception e) {
e.printStackTrace();
}
}
private static void readUnlimited() {
long file_id = -1;
long dataspace_id = -1;
long dataset_id = -1;
long[] dims = { DIM_X, DIM_Y };
int[][] dset_data;
// Open an existing file.
try {
file_id = H5.H5Fopen(FILENAME, HDF5Constants.H5F_ACC_RDONLY, HDF5Constants.H5P_DEFAULT);
}
catch (Exception e) {
e.printStackTrace();
}
// Open an existing dataset.
try {
if (file_id >= 0)
dataset_id = H5.H5Dopen(file_id, DATASETNAME, HDF5Constants.H5P_DEFAULT);
}
catch (Exception e) {
e.printStackTrace();
}
// Get dataspace and allocate memory for the read buffer as before.
try {
if (dataset_id >= 0)
dataspace_id = H5.H5Dget_space(dataset_id);
}
catch (Exception e) {
e.printStackTrace();
}
try {
if (dataspace_id >= 0)
H5.H5Sget_simple_extent_dims(dataspace_id, dims, null);
}
catch (Exception e) {
e.printStackTrace();
}
// Allocate array of pointers to rows.
dset_data = new int[(int) dims[0]][(int) dims[1]];
// Read the data using the default properties.
try {
if (dataset_id >= 0)
H5.H5Dread(dataset_id, HDF5Constants.H5T_NATIVE_INT, HDF5Constants.H5S_ALL, HDF5Constants.H5S_ALL,
HDF5Constants.H5P_DEFAULT, dset_data);
}
catch (Exception e) {
e.printStackTrace();
}
// Output the data to the screen.
System.out.println("Dataset after extension:");
for (int indx = 0; indx < dims[0]; indx++) {
System.out.print(" [ ");
for (int jndx = 0; jndx < dims[1]; jndx++)
System.out.print(dset_data[indx][jndx] + " ");
System.out.println("]");
}
System.out.println();
// End access to the dataset and release resources used by it.
try {
if (dataset_id >= 0)
H5.H5Dclose(dataset_id);
}
catch (Exception e) {
e.printStackTrace();
}
try {
if (dataspace_id >= 0)
H5.H5Sclose(dataspace_id);
}
catch (Exception e) {
e.printStackTrace();
}
// Close the file.
try {
if (file_id >= 0)
H5.H5Fclose(file_id);
}
catch (Exception e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
H5Ex_D_UnlimitedMod.writeUnlimited();
H5Ex_D_UnlimitedMod.extendUnlimited();
H5Ex_D_UnlimitedMod.readUnlimited();
}
}
|
