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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.object.Dataset;
import ncsa.hdf.object.Datatype;
import ncsa.hdf.object.FileFormat;
import ncsa.hdf.object.h5.H5Datatype;
import ncsa.hdf.object.h5.H5File;
public class H5ObjectEx_D_ReadWrite {
private static String FILENAME = "H5ObjectEx_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 DATATYPE_SIZE = 4;
private static void WriteDataset() {
H5File file = null;
Dataset dset = null;
long[] dims = { DIM_X, DIM_Y };
int[][] dset_data = new int[DIM_X][DIM_Y];
final H5Datatype typeInt = new H5Datatype(Datatype.CLASS_INTEGER,
DATATYPE_SIZE, Datatype.ORDER_LE, -1);
// 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 = new H5File(FILENAME, FileFormat.CREATE);
file.open();
}
catch (Exception e) {
e.printStackTrace();
}
// Create the dataset. We will use all default properties for this example.
// And write the data to the dataset.
try {
dset = file.createScalarDS("/" + DATASETNAME, null, typeInt,
dims, null, null, 0,
dset_data);
}
catch (Exception e) {
e.printStackTrace();
}
// Close the file.
try {
file.close();
}
catch (Exception e) {
e.printStackTrace();
}
}
private static void ReadDataset() {
H5File file = null;
Dataset dset = null;
int[] dset_data = new int[DIM_X*DIM_Y];
// Open file using the default properties.
try {
file = new H5File(FILENAME, FileFormat.READ);
file.open();
}
catch (Exception e) {
e.printStackTrace();
}
// Open dataset using the default properties.
try {
dset = (Dataset) file.get(DATASETNAME);
}
catch (Exception e) {
e.printStackTrace();
}
// Read the data using the default properties.
try {
dset.init();
dset_data = (int[]) dset.getData();
}
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*DIM_Y+jndx] + " ");
System.out.println("]");
}
System.out.println();
// Close the file.
try {
file.close();
}
catch (Exception e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
H5ObjectEx_D_ReadWrite.WriteDataset();
H5ObjectEx_D_ReadWrite.ReadDataset();
}
}
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