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 * Copyright by The HDF Group.                                               *
 * Copyright by the Board of Trustees of the University of Illinois.         *
 * All rights reserved.                                                      *
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 * This file is part of HDF5.  The full HDF5 copyright notice, including     *
 * terms governing use, modification, and redistribution, is contained in    *
 * the files COPYING and Copyright.html.  COPYING can be found at the root   *
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 * is linked from the top-level documents page.  It can also be found at     *
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 * access to either file, you may request a copy from help@hdfgroup.org.     *
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/************************************************************
    Create two datasets within groups.
 ************************************************************/

package examples.intro;

import hdf.hdf5lib.H5;
import 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() {
        long file_id = -1;
        long dataspace_id = -1;
        long dataset_id = -1;
        long group_id = -1;
        long group1_id = -1;
        long 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();
    }

}