H5Object_ReadWrite.java

//
//   Writing and reading an existing dataset.

package intro;

import hdf.object.Dataset;
import hdf.object.Datatype;
import hdf.object.FileFormat;
import hdf.object.h5.H5Datatype;
import hdf.object.h5.H5File;

public class H5Object_ReadWrite {
    private static String FILENAME         = "H5Object_ReadWrite.h5";
    private static String DATASETNAME      = "dset";
    private static final int DIM_X         = 4;
    private static final int DIM_Y         = 6;
    private static final int DATATYPE_SIZE = 4;

    private static void ReadWriteDataset()
    {
        H5File file          = null;
        Dataset dset         = null;
        int[][] dset_data    = new int[DIM_X][DIM_Y];
        int[] dset_data_read = new int[DIM_X * DIM_Y];
        long[] dims          = {DIM_X, DIM_Y};
        H5Datatype typeInt   = null;

        // Initialize the dataset.
        for (int indx = 0; indx < DIM_X; indx++)
            for (int jndx = 0; jndx < DIM_Y; jndx++)
                dset_data[indx][jndx] = indx * 6 + jndx + 1;

        // Create a new file using default properties.
        try {
            file = new H5File(FILENAME, FileFormat.CREATE);
            file.open();
        }
        catch (Exception e) {
            e.printStackTrace();
        }

        // Create the datatype.
        try {
            typeInt =
                new H5Datatype(Datatype.CLASS_INTEGER, DATATYPE_SIZE, Datatype.ORDER_BE, Datatype.NATIVE);
        }
        catch (Exception e) {
            e.printStackTrace();
        }

        // Create the dataset.
        try {
            dset = file.createScalarDS("/" + DATASETNAME, null, typeInt, dims, null, null, 0, dset_data);
        }
        catch (Exception e) {
            e.printStackTrace();
        }

        try {
            dset.init();
            dset_data_read = (int[])dset.getData();
        }
        catch (Exception e) {
            e.printStackTrace();
        }

        // Close the file.
        try {
            file.close();
        }
        catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) { H5Object_ReadWrite.ReadWriteDataset(); }
}