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//
// Create two datasets within groups.
package examples.intro;
import ncsa.hdf.hdf5lib.H5;
import ncsa.hdf.hdf5lib.HDF5Constants;
public class H5_CreateGroupDataset {
private static String FILENAME = "H5_CreateGroupDataset.h5";
private static String GROUPNAME = "MyGroup";
private static String GROUPNAME_A = "GroupA";
private static String DATASETNAME1 = "dset1";
private static String DATASETNAME2 = "dset2";
private static final int DIM1_X = 3;
private static final int DIM1_Y = 3;
private static final int DIM2_X = 2;
private static final int DIM2_Y = 10;
private static void h5_crtgrpd() {
int file_id = -1;
int dataspace_id = -1;
int dataset_id = -1;
int group_id = -1;
int group1_id = -1;
int group2_id = -1;
int[][] dset1_data = new int[DIM1_X][DIM1_Y];
int[][] dset2_data = new int[DIM2_X][DIM2_Y];
long[] dims1 = { DIM1_X, DIM1_Y };
long[] dims2 = { DIM2_X, DIM2_Y };
// Initialize the first dataset.
for (int indx = 0; indx < DIM1_X; indx++)
for (int jndx = 0; jndx < DIM1_Y; jndx++)
dset1_data[indx][jndx] = jndx + 1;
// Initialize the second dataset.
for (int indx = 0; indx < DIM2_X; indx++)
for (int jndx = 0; jndx < DIM2_Y; jndx++)
dset2_data[indx][jndx] = jndx + 1;
// Create a file.
try {
file_id = H5.H5Fcreate(FILENAME, HDF5Constants.H5F_ACC_TRUNC,
HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT);
// Create a group named "/MyGroup" in the file.
if (file_id >= 0) {
group1_id = H5.H5Gcreate(file_id, "/" + GROUPNAME,
HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT);
// Create group "Group_A" in group "MyGroup" using absolute name.
if (group1_id >= 0) {
group2_id = H5.H5Gcreate(file_id, "/" + GROUPNAME + "/" + GROUPNAME_A,
HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT);
if (group2_id >= 0)
H5.H5Gclose(group2_id);
}
if (group1_id >= 0)
H5.H5Gclose(group1_id);
}
}
catch (Exception e) {
e.printStackTrace();
}
// Create the data space for the first dataset.
try {
dataspace_id = H5.H5Screate_simple(2, dims1, null);
}
catch (Exception e) {
e.printStackTrace();
}
// Create the dataset in group "MyGroup".
try {
if ((file_id >= 0) && (dataspace_id >= 0))
dataset_id = H5.H5Dcreate(file_id,
"/" + GROUPNAME + "/" + DATASETNAME1, HDF5Constants.H5T_STD_I32BE,
dataspace_id, HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT);
}
catch (Exception e) {
e.printStackTrace();
}
// Write the first dataset.
try {
if (dataset_id >= 0)
H5.H5Dwrite(dataset_id, HDF5Constants.H5T_NATIVE_INT,
HDF5Constants.H5S_ALL, HDF5Constants.H5S_ALL,
HDF5Constants.H5P_DEFAULT, dset1_data);
}
catch (Exception e) {
e.printStackTrace();
}
// Close the data space for the first dataset.
try {
if (dataspace_id >= 0)
H5.H5Sclose(dataspace_id);
dataspace_id = -1;
}
catch (Exception e) {
e.printStackTrace();
}
// Close the first dataset.
try {
if (dataset_id >= 0)
H5.H5Dclose(dataset_id);
dataset_id = -1;
}
catch (Exception e) {
e.printStackTrace();
}
// Open an existing group of the specified file.
try {
if (file_id >= 0)
group_id = H5.H5Gopen(file_id, "/" + GROUPNAME + "/" + GROUPNAME_A, HDF5Constants.H5P_DEFAULT);
}
catch (Exception e) {
e.printStackTrace();
}
// Create the data space for the second dataset.
try {
dataspace_id = H5.H5Screate_simple(2, dims2, null);
}
catch (Exception e) {
e.printStackTrace();
}
// Create the second dataset in group "Group_A".
try {
if ((group_id >= 0) && (dataspace_id >= 0))
dataset_id = H5.H5Dcreate(group_id, DATASETNAME2,
HDF5Constants.H5T_STD_I32BE, dataspace_id,
HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT);
}
catch (Exception e) {
e.printStackTrace();
}
// Write the second dataset.
try {
if (dataset_id >= 0)
H5.H5Dwrite(dataset_id, HDF5Constants.H5T_NATIVE_INT,
HDF5Constants.H5S_ALL, HDF5Constants.H5S_ALL,
HDF5Constants.H5P_DEFAULT, dset2_data);
}
catch (Exception e) {
e.printStackTrace();
}
// Close the data space for the second dataset.
try {
if (dataspace_id >= 0)
H5.H5Sclose(dataspace_id);
}
catch (Exception e) {
e.printStackTrace();
}
// Close the second dataset.
try {
if (dataset_id >= 0)
H5.H5Dclose(dataset_id);
}
catch (Exception e) {
e.printStackTrace();
}
// Close the group.
try {
if (group_id >= 0)
H5.H5Gclose(group_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) {
H5_CreateGroupDataset.h5_crtgrpd();
}
}
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