//
//  Create two datasets within groups.

package examples.intro;

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;
import ncsa.hdf.object.h5.H5Group;

public class H5Object_CreateGroupDataset {
	private static String FILENAME = "H5Object_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 final int DATATYPE_SIZE = 4;

	private static void h5_crtgrpd() {
        H5File file = null;
        H5Group grp = null;
        Dataset dset = null;
		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 };
        final H5Datatype typeInt = new H5Datatype(Datatype.CLASS_INTEGER,
                DATATYPE_SIZE, Datatype.ORDER_BE, -1);

		// 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;

		// Open an existing file or create a new file.
		try {
            file = new H5File(FILENAME, FileFormat.CREATE);
            file.open();
		}
		catch (Exception e) {
			e.printStackTrace();
		}

		// Create the group for the first dataset.
		try {
            grp = (H5Group)file.createGroup("/" + GROUPNAME, null);
		}
		catch (Exception e) {
			e.printStackTrace();
		}

		// Create the dataset in group "MyGroup".
		// Write the first dataset.
		try {
            dset = file.createScalarDS("/" + GROUPNAME + "/" + DATASETNAME1, grp, typeInt,
                    dims1, null, null, 0,
                    dset1_data);
		}
		catch (Exception e) {
			e.printStackTrace();
		}

		// Create the second dataset in group "Group_A".
		try {
            dset = file.createScalarDS("/" + GROUPNAME + "/" + DATASETNAME2, grp, typeInt,
                    dims2, null, null, 0,
                    dset2_data);
		}
		catch (Exception e) {
			e.printStackTrace();
		}

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

	public static void main(String[] args) {
		H5Object_CreateGroupDataset.h5_crtgrpd();
	}

}