HDF5-1.14.1/java/examples/intro/H5_CreateGroupDataset.java

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 * All rights reserved.                                                      *
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 * 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       = HDF5Constants.H5I_INVALID_HID;
        long dataspace_id  = HDF5Constants.H5I_INVALID_HID;
        long dataset_id    = HDF5Constants.H5I_INVALID_HID;
        long group_id      = HDF5Constants.H5I_INVALID_HID;
        long group1_id     = HDF5Constants.H5I_INVALID_HID;
        long group2_id     = HDF5Constants.H5I_INVALID_HID;
        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 = HDF5Constants.H5I_INVALID_HID;
        }
        catch (Exception e) {
            e.printStackTrace();
        }

        // Close the first dataset.
        try {
            if (dataset_id >= 0)
                H5.H5Dclose(dataset_id);
            dataset_id = HDF5Constants.H5I_INVALID_HID;
        }
        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(); }
}