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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
- using a data transform expression. The program first
- writes integers to a dataset using the transform
- expression TRANSFORM, then closes the file. Next, it
- reopens the file, reads back the data without a transform,
- and outputs the data to the screen. Finally it reads the
- data using the transform expression RTRANSFORM and outputs
- the results to the screen.
- ************************************************************/
-package examples.datasets;
-
-import hdf.hdf5lib.H5;
-import hdf.hdf5lib.HDF5Constants;
-
-public class H5Ex_D_Transform {
-
- private static String FILE = "H5Ex_D_Transform.h5";
- private static String DATASET = "DS1";
- private static final int DIM_X = 4;
- private static final int DIM_Y = 7;
- private static String TRANSFORM = "x+1";
- private static String RTRANSFORM = "x-1";
-
- private static void writeData()
- {
- long file_id = HDF5Constants.H5I_INVALID_HID;
- long filespace_id = HDF5Constants.H5I_INVALID_HID;
- long dataset_id = HDF5Constants.H5I_INVALID_HID;
- long dxpl_id = HDF5Constants.H5I_INVALID_HID;
-
- long[] dims = {DIM_X, DIM_Y};
- int[][] dset_data = new int[DIM_X][DIM_Y];
-
- // Initialize data.
- for (int i = 0; i < DIM_X; i++)
- for (int j = 0; j < DIM_Y; j++)
- dset_data[i][j] = i * j - j;
-
- // Output the data to the screen.
- System.out.println("Original Data:");
- for (int i = 0; i < DIM_X; i++) {
- System.out.print(" [");
- for (int j = 0; j < DIM_Y; j++)
- System.out.print(" " + dset_data[i][j] + " ");
- System.out.println("]");
- }
-
- // Create a new file using the default properties.
- try {
- file_id = H5.H5Fcreate(FILE, 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(2, dims, null);
- }
- catch (Exception e) {
- e.printStackTrace();
- }
-
- // Create the dataset transfer property list and define the transform expression.
- try {
- dxpl_id = H5.H5Pcreate(HDF5Constants.H5P_DATASET_XFER);
- if (dxpl_id >= 0)
- H5.H5Pset_data_transform(dxpl_id, TRANSFORM);
- }
- catch (Exception e) {
- e.printStackTrace();
- }
-
- // Create the dataset using the default properties. Unfortunately we must save as
- // a native type or the transform operation will fail.
- try {
- if ((file_id >= 0) && (filespace_id >= 0))
- dataset_id = H5.H5Dcreate(file_id, DATASET, HDF5Constants.H5T_NATIVE_INT, filespace_id,
- HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT,
- HDF5Constants.H5P_DEFAULT);
- }
- catch (Exception e) {
- e.printStackTrace();
- }
-
- // Write the data to the dataset using the dataset transfer property list.
- try {
- if ((dataset_id >= 0) && (dxpl_id >= 0))
- H5.H5Dwrite(dataset_id, HDF5Constants.H5T_NATIVE_INT, HDF5Constants.H5S_ALL,
- HDF5Constants.H5S_ALL, dxpl_id, dset_data);
- }
- catch (Exception e) {
- e.printStackTrace();
- }
-
- // End access to the dataset and release resources used by it.
- try {
- if (dxpl_id >= 0)
- H5.H5Pclose(dxpl_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();
- }
- }
-
- private static void readData()
- {
-
- long file_id = HDF5Constants.H5I_INVALID_HID;
- long dataset_id = HDF5Constants.H5I_INVALID_HID;
- long dxpl_id = HDF5Constants.H5I_INVALID_HID;
- int[][] dset_data = new int[DIM_X][DIM_Y];
-
- // Open an existing file using the default properties.
- try {
- file_id = H5.H5Fopen(FILE, HDF5Constants.H5F_ACC_RDONLY, HDF5Constants.H5P_DEFAULT);
- }
- catch (Exception e) {
- e.printStackTrace();
- }
-
- // Open an existing dataset using the default properties.
- try {
- if (file_id >= 0)
- dataset_id = H5.H5Dopen(file_id, DATASET, 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 with transform '" + TRANSFORM + "'");
- for (int i = 0; i < DIM_X; i++) {
- System.out.print(" [");
- for (int j = 0; j < DIM_Y; j++)
- System.out.print(" " + dset_data[i][j] + " ");
- System.out.println("]");
- }
-
- // Create the dataset transfer property list and define the transform expression.
- try {
- dxpl_id = H5.H5Pcreate(HDF5Constants.H5P_DATASET_XFER);
- if (dxpl_id >= 0)
- H5.H5Pset_data_transform(dxpl_id, RTRANSFORM);
- }
- catch (Exception e) {
- e.printStackTrace();
- }
-
- // Read the data using the dataset transfer property list.
- try {
- if ((dataset_id >= 0) && (dxpl_id >= 0))
- H5.H5Dread(dataset_id, HDF5Constants.H5T_NATIVE_INT, HDF5Constants.H5S_ALL,
- HDF5Constants.H5S_ALL, dxpl_id, dset_data);
- }
- catch (Exception e) {
- e.printStackTrace();
- }
-
- // Output the data to the screen.
-
- System.out.println("Data as written with transform '" + TRANSFORM + "' and read with transform '" +
- RTRANSFORM + "'");
- for (int i = 0; i < DIM_X; i++) {
- System.out.print(" [");
- for (int j = 0; j < DIM_Y; j++)
- System.out.print(" " + dset_data[i][j] + " ");
- System.out.println("]");
- }
-
- // Close and release resources.
- try {
- if (dxpl_id >= 0)
- H5.H5Pclose(dxpl_id);
- }
- catch (Exception e) {
- e.printStackTrace();
- }
- try {
- if (dataset_id >= 0)
- H5.H5Dclose(dataset_id);
- }
- catch (Exception e) {
- e.printStackTrace();
- }
- try {
- if (file_id >= 0)
- H5.H5Fclose(file_id);
- }
- catch (Exception e) {
- e.printStackTrace();
- }
- }
-
- public static void main(String[] args)
- {
- H5Ex_D_Transform.writeData();
- H5Ex_D_Transform.readData();
- }
-}
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