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
|
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Copyright by The HDF Group. *
* 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://www.hdfgroup.org/licenses. *
* If you do not have access to either file, you may request a copy from *
* help@hdfgroup.org. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/************************************************************
This example shows how to read and write opaque datatypes
to an attribute. The program first writes opaque data to
an attribute with a dataspace of DIM0, then closes the
file. Next, it reopens the file, reads back the data, and
outputs it to the screen.
************************************************************/
import hdf.hdf5lib.H5;
import hdf.hdf5lib.HDF5Constants;
public class H5Ex_T_OpaqueAttribute {
private static String FILENAME = "H5Ex_T_OpaqueAttribute.h5";
private static String DATASETNAME = "DS1";
private static String ATTRIBUTENAME = "A1";
private static final int DIM0 = 4;
private static final int LEN = 7;
private static final int RANK = 1;
private static void CreateDataset()
{
long file_id = HDF5Constants.H5I_INVALID_HID;
long dataspace_id = HDF5Constants.H5I_INVALID_HID;
long datatype_id = HDF5Constants.H5I_INVALID_HID;
long dataset_id = HDF5Constants.H5I_INVALID_HID;
long attribute_id = HDF5Constants.H5I_INVALID_HID;
long[] dims = {DIM0};
byte[] dset_data = new byte[DIM0 * LEN];
byte[] str_data = {'O', 'P', 'A', 'Q', 'U', 'E'};
// Initialize data.
for (int indx = 0; indx < DIM0; indx++) {
for (int jndx = 0; jndx < LEN - 1; jndx++)
dset_data[jndx + indx * LEN] = str_data[jndx];
dset_data[LEN - 1 + indx * LEN] = (byte)(indx + '0');
}
// 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 dataset with a scalar dataspace.
try {
dataspace_id = H5.H5Screate(HDF5Constants.H5S_SCALAR);
if (dataspace_id >= 0) {
dataset_id = H5.H5Dcreate(file_id, DATASETNAME, HDF5Constants.H5T_STD_I32LE, dataspace_id,
HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT,
HDF5Constants.H5P_DEFAULT);
H5.H5Sclose(dataspace_id);
dataspace_id = HDF5Constants.H5I_INVALID_HID;
}
}
catch (Exception e) {
e.printStackTrace();
}
// Create opaque datatype and set the tag to something appropriate.
// For this example we will write and view the data as a character
// array.
try {
datatype_id = H5.H5Tcreate(HDF5Constants.H5T_OPAQUE, (long)LEN);
if (datatype_id >= 0)
H5.H5Tset_tag(datatype_id, "Character array");
}
catch (Exception e) {
e.printStackTrace();
}
// Create dataspace. Setting maximum size to NULL sets the maximum
// size to be the current size.
try {
dataspace_id = H5.H5Screate_simple(RANK, dims, null);
}
catch (Exception e) {
e.printStackTrace();
}
// Create the attribute and write the array data to it.
try {
if ((dataset_id >= 0) && (datatype_id >= 0) && (dataspace_id >= 0))
attribute_id = H5.H5Acreate(dataset_id, ATTRIBUTENAME, datatype_id, dataspace_id,
HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT);
}
catch (Exception e) {
e.printStackTrace();
}
// Write the dataset.
try {
if ((attribute_id >= 0) && (datatype_id >= 0))
H5.H5Awrite(attribute_id, datatype_id, dset_data);
}
catch (Exception e) {
e.printStackTrace();
}
// End access to the dataset and release resources used by it.
try {
if (attribute_id >= 0)
H5.H5Aclose(attribute_id);
}
catch (Exception e) {
e.printStackTrace();
}
try {
if (dataset_id >= 0)
H5.H5Dclose(dataset_id);
}
catch (Exception e) {
e.printStackTrace();
}
// Terminate access to the data space.
try {
if (dataspace_id >= 0)
H5.H5Sclose(dataspace_id);
}
catch (Exception e) {
e.printStackTrace();
}
try {
if (datatype_id >= 0)
H5.H5Tclose(datatype_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 ReadDataset()
{
long file_id = HDF5Constants.H5I_INVALID_HID;
long datatype_id = HDF5Constants.H5I_INVALID_HID;
long dataspace_id = HDF5Constants.H5I_INVALID_HID;
long dataset_id = HDF5Constants.H5I_INVALID_HID;
long attribute_id = HDF5Constants.H5I_INVALID_HID;
long type_len = -1;
long[] dims = {DIM0};
byte[] dset_data;
String tag_name = null;
// 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();
}
try {
if (dataset_id >= 0)
attribute_id = H5.H5Aopen_by_name(dataset_id, ".", ATTRIBUTENAME, HDF5Constants.H5P_DEFAULT,
HDF5Constants.H5P_DEFAULT);
}
catch (Exception e) {
e.printStackTrace();
}
// Get datatype and properties for the datatype.
try {
if (attribute_id >= 0)
datatype_id = H5.H5Aget_type(attribute_id);
if (datatype_id >= 0) {
type_len = H5.H5Tget_size(datatype_id);
tag_name = H5.H5Tget_tag(datatype_id);
}
}
catch (Exception e) {
e.printStackTrace();
}
// Get dataspace and allocate memory for read buffer.
try {
if (attribute_id >= 0)
dataspace_id = H5.H5Aget_space(attribute_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 buffer.
dset_data = new byte[(int)(dims[0] * type_len)];
// Read data.
try {
if ((attribute_id >= 0) && (datatype_id >= 0))
H5.H5Aread(attribute_id, datatype_id, dset_data);
}
catch (Exception e) {
e.printStackTrace();
}
// Output the data to the screen.
System.out.println("Datatype tag for " + ATTRIBUTENAME + " is: \"" + tag_name + "\"");
for (int indx = 0; indx < dims[0]; indx++) {
System.out.print(ATTRIBUTENAME + "[" + indx + "]: ");
for (int jndx = 0; jndx < type_len; jndx++) {
char temp = (char)dset_data[jndx + indx * (int)type_len];
System.out.print(temp);
}
System.out.println("");
}
System.out.println();
// End access to the dataset and release resources used by it.
try {
if (attribute_id >= 0)
H5.H5Aclose(attribute_id);
}
catch (Exception e) {
e.printStackTrace();
}
try {
if (dataset_id >= 0)
H5.H5Dclose(dataset_id);
}
catch (Exception e) {
e.printStackTrace();
}
// Terminate access to the data space.
try {
if (dataspace_id >= 0)
H5.H5Sclose(dataspace_id);
}
catch (Exception e) {
e.printStackTrace();
}
try {
if (datatype_id >= 0)
H5.H5Tclose(datatype_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_T_OpaqueAttribute.CreateDataset();
// Now we begin the read section of this example. Here we assume
// the dataset and array have the same name and rank, but can have
// any size. Therefore we must allocate a new array to read in
// data using malloc().
H5Ex_T_OpaqueAttribute.ReadDataset();
}
}
|
