hdf5/HDF5Examples/JAVA/TUTR/HDF5GroupCreate.java

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * Copyright by The HDF Group.                                               *
 * Copyright by the Board of Trustees of the University of Illinois.         *
 * All rights reserved.                                                      *
 *                                                                           *
 * This file is part of HDF5.  The full HDF5 copyright notice, including     *
 * terms governing use, modification, and redistribution, is contained in    *
 * the LICENSE file, which can be found at the root of the source code       *
 * distribution tree, or in https://www.hdfgroup.org/licenses.               *
 * If you do not have access to either file, you may request a copy from     *
 * help@hdfgroup.org.                                                        *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

import hdf.hdf5lib.H5;
import hdf.hdf5lib.HDF5Constants;

/**
 * <p>
 * Title: HDF Native Package (Java) Example
 * </p>
 * <p>
 * Description: this example shows how to create HDF5 groups using the
 * "HDF Native Package (Java)". The example created the group structure:
 *
 * <pre>
 *     "/" (root)
 *         g1
 *             g11
 *             g12
 *         g2
 *             g21
 *             g22
 * </pre>
 *
 * </p>
 */
public class HDF5GroupCreate {
    private static String fname = "HDF5GroupCreate.h5";

    private static void CreateGroup()
    {
        long file_id     = HDF5Constants.H5I_INVALID_HID;
        long subgroup_id = HDF5Constants.H5I_INVALID_HID;
        long group_id1   = HDF5Constants.H5I_INVALID_HID;
        long group_id2   = HDF5Constants.H5I_INVALID_HID;

        // Create a new file using default properties.
        try {
            file_id = H5.H5Fcreate(fname, HDF5Constants.H5F_ACC_TRUNC, HDF5Constants.H5P_DEFAULT,
                                   HDF5Constants.H5P_DEFAULT);
        }
        catch (Exception e) {
            e.printStackTrace();
            System.err.println("Failed to create file:" + fname);
            return;
        }

        // Create a group in the file.
        try {
            if (file_id >= 0) {
                group_id1 = H5.H5Gcreate(file_id, "g1", HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT,
                                         HDF5Constants.H5P_DEFAULT);
                if (group_id1 >= 0) {
                    subgroup_id = H5.H5Gcreate(group_id1, "g11", HDF5Constants.H5P_DEFAULT,
                                               HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT);
                    try {
                        if (subgroup_id >= 0)
                            H5.H5Gclose(subgroup_id);
                    }
                    catch (Exception e) {
                        e.printStackTrace();
                    }
                    subgroup_id = H5.H5Gcreate(group_id1, "g12", HDF5Constants.H5P_DEFAULT,
                                               HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT);
                    try {
                        if (subgroup_id >= 0)
                            H5.H5Gclose(subgroup_id);
                    }
                    catch (Exception e) {
                        e.printStackTrace();
                    }
                }
                group_id2 = H5.H5Gcreate(file_id, "g2", HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT,
                                         HDF5Constants.H5P_DEFAULT);
                if (group_id2 >= 0) {
                    subgroup_id = H5.H5Gcreate(group_id2, "g21", HDF5Constants.H5P_DEFAULT,
                                               HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT);
                    try {
                        if (subgroup_id >= 0)
                            H5.H5Gclose(subgroup_id);
                    }
                    catch (Exception e) {
                        e.printStackTrace();
                    }
                    subgroup_id = H5.H5Gcreate(group_id2, "g22", HDF5Constants.H5P_DEFAULT,
                                               HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT);
                    try {
                        if (subgroup_id >= 0)
                            H5.H5Gclose(subgroup_id);
                    }
                    catch (Exception e) {
                        e.printStackTrace();
                    }
                }
            }
        }
        catch (Exception e) {
            e.printStackTrace();
        }

        // Close the groups.
        try {
            if (group_id2 >= 0)
                H5.H5Gclose(group_id2);
        }
        catch (Exception e) {
            e.printStackTrace();
        }
        try {
            if (group_id1 >= 0)
                H5.H5Gclose(group_id1);
        }
        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) { HDF5GroupCreate.CreateGroup(); }
}