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/************************************************************
This example shows how to read and write data to a
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, and
outputs it to the screen.
************************************************************/
package examples.datasets;
import ncsa.hdf.hdf5lib.H5;
import ncsa.hdf.hdf5lib.HDF5Constants;
public class H5Ex_D_ReadWrite {
private static String FILENAME = "H5Ex_D_ReadWrite.h5";
private static String DATASETNAME = "DS1";
private static final int DIM_X = 4;
private static final int DIM_Y = 7;
private static final int RANK = 2;
private static void WriteDataset() {
int file_id = -1;
int filespace_id = -1;
int dataset_id = -1;
long[] dims = { DIM_X, DIM_Y };
int[][] dset_data = new int[DIM_X][DIM_Y];
// Initialize data.
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. Setting maximum size to NULL sets the maximum
// size to be the current size.
try {
filespace_id = H5.H5Screate_simple(RANK, dims, null);
}
catch (Exception e) {
e.printStackTrace();
}
// Create the dataset. We will use all default properties for this example.
try {
if ((file_id >= 0) && (filespace_id >= 0))
dataset_id = H5.H5Dcreate(file_id, DATASETNAME,
HDF5Constants.H5T_STD_I32LE, filespace_id,
HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT, 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 (filespace_id >= 0)
H5.H5Sclose(filespace_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() {
int file_id = -1;
int dataset_id = -1;
int[][] dset_data = new int[DIM_X][DIM_Y];
// Open file using the default properties.
try {
file_id = H5.H5Fopen(FILENAME, HDF5Constants.H5F_ACC_RDWR, HDF5Constants.H5P_DEFAULT);
}
catch (Exception e) {
e.printStackTrace();
}
// Open dataset using the default properties.
try {
if (file_id >= 0)
dataset_id = H5.H5Dopen(file_id, DATASETNAME, HDF5Constants.H5P_DEFAULT);
}
catch (Exception e) {
e.printStackTrace();
}
// 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(DATASETNAME + ":");
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();
// Close the dataset.
try {
if (dataset_id >= 0)
H5.H5Dclose(dataset_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_ReadWrite.WriteDataset();
H5Ex_D_ReadWrite.ReadDataset();
}
}
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