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-/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
- * Copyright by The HDF Group. *
- * 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 COPYING 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. *
- * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
-
-/************************************************************
- This example shows how to read and write data to a
- dataset by hyberslabs. The program first writes integers
- in a hyperslab selection to a dataset with dataspace
- dimensions of DIM_XxDIM_Y, then closes the file. Next, it
- reopens the file, reads back the data, and outputs it to
- the screen. Finally it reads the data again using a
- different hyperslab selection, and outputs the result to
- the screen.
- ************************************************************/
-package examples.datasets;
-
-import hdf.hdf5lib.H5;
-import hdf.hdf5lib.HDF5Constants;
-
-public class H5Ex_D_Hyperslab {
- private static String FILENAME = "H5Ex_D_Hyperslab.h5";
- private static String DATASETNAME = "DS1";
- private static final int DIM_X = 6;
- private static final int DIM_Y = 8;
- private static final int RANK = 2;
-
- private static void writeHyperslab()
- {
- long file_id = HDF5Constants.H5I_INVALID_HID;
- long filespace_id = HDF5Constants.H5I_INVALID_HID;
- long dataset_id = HDF5Constants.H5I_INVALID_HID;
- long[] dims = {DIM_X, DIM_Y};
- int[][] dset_data = new int[DIM_X][DIM_Y];
-
- // Initialize data to "1", to make it easier to see the selections.
- for (int indx = 0; indx < DIM_X; indx++)
- for (int jndx = 0; jndx < DIM_Y; jndx++)
- dset_data[indx][jndx] = 1;
-
- // Print the data to the screen.
- System.out.println("Original Data:");
- for (int indx = 0; indx < DIM_X; indx++) {
- System.out.print(" [ ");
- for (int jndx = 0; jndx < DIM_Y; jndx++)
- System.out.print(dset_data[indx][jndx] + " ");
- System.out.println("]");
- }
- System.out.println();
-
- // Create a new file using default properties.
- try {
- file_id = H5.H5Fcreate(FILENAME, HDF5Constants.H5F_ACC_TRUNC, HDF5Constants.H5P_DEFAULT,
- HDF5Constants.H5P_DEFAULT);
- }
- catch (Exception e) {
- e.printStackTrace();
- }
-
- // Create dataspace. Setting maximum size to NULL sets the maximum
- // size to be the current size.
- try {
- filespace_id = H5.H5Screate_simple(RANK, dims, null);
- }
- catch (Exception e) {
- e.printStackTrace();
- }
-
- // Create the dataset. We will use all default properties for this example.
- try {
- if ((file_id >= 0) && (filespace_id >= 0))
- dataset_id = H5.H5Dcreate(file_id, DATASETNAME, HDF5Constants.H5T_STD_I32LE, filespace_id,
- HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT,
- HDF5Constants.H5P_DEFAULT);
- }
- catch (Exception e) {
- e.printStackTrace();
- }
-
- // Define and select the first part of the hyperslab selection.
- long[] start = {0, 0};
- long[] stride = {3, 3};
- long[] count = {2, 3};
- long[] block = {2, 2};
- try {
- if ((filespace_id >= 0))
- H5.H5Sselect_hyperslab(filespace_id, HDF5Constants.H5S_SELECT_SET, start, stride, count,
- block);
- }
- catch (Exception e) {
- e.printStackTrace();
- }
- // Define and select the second part of the hyperslab selection,
- // which is subtracted from the first selection by the use of
- // H5S_SELECT_NOTB
- block[0] = 1;
- block[1] = 1;
- try {
- if ((filespace_id >= 0)) {
- H5.H5Sselect_hyperslab(filespace_id, HDF5Constants.H5S_SELECT_NOTB, start, stride, count,
- block);
-
- // Write the data to the dataset.
- if (dataset_id >= 0)
- H5.H5Dwrite(dataset_id, HDF5Constants.H5T_NATIVE_INT, HDF5Constants.H5S_ALL, filespace_id,
- HDF5Constants.H5P_DEFAULT, dset_data);
- }
- }
- catch (Exception e) {
- e.printStackTrace();
- }
-
- // End access to the dataset and release resources used by it.
- try {
- if (dataset_id >= 0)
- H5.H5Dclose(dataset_id);
- }
- catch (Exception e) {
- e.printStackTrace();
- }
-
- try {
- if (filespace_id >= 0)
- H5.H5Sclose(filespace_id);
- }
- catch (Exception e) {
- e.printStackTrace();
- }
-
- // Close the file.
- try {
- if (file_id >= 0)
- H5.H5Fclose(file_id);
- }
- catch (Exception e) {
- e.printStackTrace();
- }
- }
-
- private static void readHyperslab()
- {
- long file_id = HDF5Constants.H5I_INVALID_HID;
- long filespace_id = HDF5Constants.H5I_INVALID_HID;
- long dataset_id = HDF5Constants.H5I_INVALID_HID;
- long dcpl_id = HDF5Constants.H5I_INVALID_HID;
- int[][] dset_data = new int[DIM_X][DIM_Y];
-
- // Open an existing file.
- try {
- file_id = H5.H5Fopen(FILENAME, HDF5Constants.H5F_ACC_RDONLY, HDF5Constants.H5P_DEFAULT);
- }
- catch (Exception e) {
- e.printStackTrace();
- }
-
- // Open an existing dataset.
- try {
- if (file_id >= 0)
- dataset_id = H5.H5Dopen(file_id, DATASETNAME, HDF5Constants.H5P_DEFAULT);
- }
- catch (Exception e) {
- e.printStackTrace();
- }
-
- // Read the data using the default properties.
- try {
- if (dataset_id >= 0)
- H5.H5Dread(dataset_id, HDF5Constants.H5T_NATIVE_INT, HDF5Constants.H5S_ALL,
- HDF5Constants.H5S_ALL, HDF5Constants.H5P_DEFAULT, dset_data);
- }
- catch (Exception e) {
- e.printStackTrace();
- }
-
- // Output the data to the screen.
- System.out.println("Data as written to disk by hyberslabs:");
- for (int indx = 0; indx < DIM_X; indx++) {
- System.out.print(" [ ");
- for (int jndx = 0; jndx < DIM_Y; jndx++)
- System.out.print(dset_data[indx][jndx] + " ");
- System.out.println("]");
- }
- System.out.println();
-
- // Initialize the read array.
- for (int indx = 0; indx < DIM_X; indx++)
- for (int jndx = 0; jndx < DIM_Y; jndx++)
- dset_data[indx][jndx] = 0;
-
- // Define and select the hyperslab to use for reading.
- try {
- if (dataset_id >= 0) {
- filespace_id = H5.H5Dget_space(dataset_id);
-
- long[] start = {0, 1};
- long[] stride = {4, 4};
- long[] count = {2, 2};
- long[] block = {2, 3};
-
- if (filespace_id >= 0) {
- H5.H5Sselect_hyperslab(filespace_id, HDF5Constants.H5S_SELECT_SET, start, stride, count,
- block);
-
- // Read the data using the previously defined hyperslab.
- if ((dataset_id >= 0) && (filespace_id >= 0))
- H5.H5Dread(dataset_id, HDF5Constants.H5T_NATIVE_INT, HDF5Constants.H5S_ALL,
- filespace_id, HDF5Constants.H5P_DEFAULT, dset_data);
- }
- }
- }
- catch (Exception e) {
- e.printStackTrace();
- }
-
- // Output the data to the screen.
- System.out.println("Data as read from disk by hyberslab:");
- for (int indx = 0; indx < DIM_X; indx++) {
- System.out.print(" [ ");
- for (int jndx = 0; jndx < DIM_Y; jndx++)
- System.out.print(dset_data[indx][jndx] + " ");
- System.out.println("]");
- }
- System.out.println();
-
- // End access to the dataset and release resources used by it.
- try {
- if (dcpl_id >= 0)
- H5.H5Pclose(dcpl_id);
- }
- catch (Exception e) {
- e.printStackTrace();
- }
-
- try {
- if (dataset_id >= 0)
- H5.H5Dclose(dataset_id);
- }
- catch (Exception e) {
- e.printStackTrace();
- }
-
- try {
- if (filespace_id >= 0)
- H5.H5Sclose(filespace_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)
- {
- H5Ex_D_Hyperslab.writeHyperslab();
- H5Ex_D_Hyperslab.readHyperslab();
- }
-}
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