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251 lines
8.6 KiB
251 lines
8.6 KiB
2 years ago
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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
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* Copyright by The HDF Group. *
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* All rights reserved. *
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* *
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* This file is part of HDF5. The full HDF5 copyright notice, including *
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* terms governing use, modification, and redistribution, is contained in *
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* the COPYING file, which can be found at the root of the source code *
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* distribution tree, or in https://www.hdfgroup.org/licenses. *
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* If you do not have access to either file, you may request a copy from *
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* help@hdfgroup.org. *
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* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
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/************************************************************
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This example shows how to read and write data to a dataset
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using a data transform expression. The program first
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writes integers to a dataset using the transform
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expression TRANSFORM, then closes the file. Next, it
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reopens the file, reads back the data without a transform,
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and outputs the data to the screen. Finally it reads the
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data using the transform expression RTRANSFORM and outputs
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the results to the screen.
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************************************************************/
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package examples.datasets;
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import hdf.hdf5lib.H5;
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import hdf.hdf5lib.HDF5Constants;
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public class H5Ex_D_Transform {
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private static String FILE = "H5Ex_D_Transform.h5";
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private static String DATASET = "DS1";
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private static final int DIM_X = 4;
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private static final int DIM_Y = 7;
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private static String TRANSFORM = "x+1";
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private static String RTRANSFORM = "x-1";
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private static void writeData()
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{
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long file_id = HDF5Constants.H5I_INVALID_HID;
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long filespace_id = HDF5Constants.H5I_INVALID_HID;
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long dataset_id = HDF5Constants.H5I_INVALID_HID;
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long dxpl_id = HDF5Constants.H5I_INVALID_HID;
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long[] dims = {DIM_X, DIM_Y};
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int[][] dset_data = new int[DIM_X][DIM_Y];
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// Initialize data.
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for (int i = 0; i < DIM_X; i++)
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for (int j = 0; j < DIM_Y; j++)
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dset_data[i][j] = i * j - j;
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// Output the data to the screen.
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System.out.println("Original Data:");
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for (int i = 0; i < DIM_X; i++) {
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System.out.print(" [");
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for (int j = 0; j < DIM_Y; j++)
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System.out.print(" " + dset_data[i][j] + " ");
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System.out.println("]");
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}
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// Create a new file using the default properties.
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try {
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file_id = H5.H5Fcreate(FILE, HDF5Constants.H5F_ACC_TRUNC, HDF5Constants.H5P_DEFAULT,
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HDF5Constants.H5P_DEFAULT);
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}
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catch (Exception e) {
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e.printStackTrace();
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}
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// Create dataspace. Setting maximum size to NULL sets the maximum
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// size to be the current size.
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try {
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filespace_id = H5.H5Screate_simple(2, dims, null);
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}
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catch (Exception e) {
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e.printStackTrace();
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}
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// Create the dataset transfer property list and define the transform expression.
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try {
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dxpl_id = H5.H5Pcreate(HDF5Constants.H5P_DATASET_XFER);
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if (dxpl_id >= 0)
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H5.H5Pset_data_transform(dxpl_id, TRANSFORM);
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}
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catch (Exception e) {
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e.printStackTrace();
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}
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// Create the dataset using the default properties. Unfortunately we must save as
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// a native type or the transform operation will fail.
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try {
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if ((file_id >= 0) && (filespace_id >= 0))
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dataset_id = H5.H5Dcreate(file_id, DATASET, HDF5Constants.H5T_NATIVE_INT, filespace_id,
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HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT,
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HDF5Constants.H5P_DEFAULT);
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}
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catch (Exception e) {
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e.printStackTrace();
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}
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// Write the data to the dataset using the dataset transfer property list.
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try {
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if ((dataset_id >= 0) && (dxpl_id >= 0))
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H5.H5Dwrite(dataset_id, HDF5Constants.H5T_NATIVE_INT, HDF5Constants.H5S_ALL,
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HDF5Constants.H5S_ALL, dxpl_id, dset_data);
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}
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catch (Exception e) {
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e.printStackTrace();
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}
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// End access to the dataset and release resources used by it.
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try {
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if (dxpl_id >= 0)
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H5.H5Pclose(dxpl_id);
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}
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catch (Exception e) {
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e.printStackTrace();
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}
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try {
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if (dataset_id >= 0)
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H5.H5Dclose(dataset_id);
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}
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catch (Exception e) {
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e.printStackTrace();
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}
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try {
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if (filespace_id >= 0)
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H5.H5Sclose(filespace_id);
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}
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catch (Exception e) {
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e.printStackTrace();
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}
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// Close the file.
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try {
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if (file_id >= 0)
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H5.H5Fclose(file_id);
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}
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catch (Exception e) {
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e.printStackTrace();
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}
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}
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private static void readData()
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{
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long file_id = HDF5Constants.H5I_INVALID_HID;
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long dataset_id = HDF5Constants.H5I_INVALID_HID;
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long dxpl_id = HDF5Constants.H5I_INVALID_HID;
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int[][] dset_data = new int[DIM_X][DIM_Y];
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// Open an existing file using the default properties.
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try {
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file_id = H5.H5Fopen(FILE, HDF5Constants.H5F_ACC_RDONLY, HDF5Constants.H5P_DEFAULT);
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}
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catch (Exception e) {
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e.printStackTrace();
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}
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// Open an existing dataset using the default properties.
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try {
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if (file_id >= 0)
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dataset_id = H5.H5Dopen(file_id, DATASET, HDF5Constants.H5P_DEFAULT);
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}
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catch (Exception e) {
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e.printStackTrace();
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}
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// Read the data using the default properties.
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try {
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if (dataset_id >= 0)
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H5.H5Dread(dataset_id, HDF5Constants.H5T_NATIVE_INT, HDF5Constants.H5S_ALL,
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HDF5Constants.H5S_ALL, HDF5Constants.H5P_DEFAULT, dset_data);
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}
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catch (Exception e) {
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e.printStackTrace();
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}
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// Output the data to the screen.
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System.out.println("Data as written with transform '" + TRANSFORM + "'");
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for (int i = 0; i < DIM_X; i++) {
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System.out.print(" [");
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for (int j = 0; j < DIM_Y; j++)
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System.out.print(" " + dset_data[i][j] + " ");
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System.out.println("]");
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}
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// Create the dataset transfer property list and define the transform expression.
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try {
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dxpl_id = H5.H5Pcreate(HDF5Constants.H5P_DATASET_XFER);
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if (dxpl_id >= 0)
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H5.H5Pset_data_transform(dxpl_id, RTRANSFORM);
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}
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catch (Exception e) {
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e.printStackTrace();
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}
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// Read the data using the dataset transfer property list.
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try {
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if ((dataset_id >= 0) && (dxpl_id >= 0))
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H5.H5Dread(dataset_id, HDF5Constants.H5T_NATIVE_INT, HDF5Constants.H5S_ALL,
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HDF5Constants.H5S_ALL, dxpl_id, dset_data);
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}
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catch (Exception e) {
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e.printStackTrace();
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}
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// Output the data to the screen.
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System.out.println("Data as written with transform '" + TRANSFORM + "' and read with transform '" +
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RTRANSFORM + "'");
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for (int i = 0; i < DIM_X; i++) {
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System.out.print(" [");
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for (int j = 0; j < DIM_Y; j++)
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System.out.print(" " + dset_data[i][j] + " ");
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System.out.println("]");
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}
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// Close and release resources.
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try {
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if (dxpl_id >= 0)
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H5.H5Pclose(dxpl_id);
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}
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catch (Exception e) {
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e.printStackTrace();
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}
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try {
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if (dataset_id >= 0)
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H5.H5Dclose(dataset_id);
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}
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catch (Exception e) {
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e.printStackTrace();
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}
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try {
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if (file_id >= 0)
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H5.H5Fclose(file_id);
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}
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catch (Exception e) {
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e.printStackTrace();
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}
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}
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public static void main(String[] args)
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{
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H5Ex_D_Transform.writeData();
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H5Ex_D_Transform.readData();
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}
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}
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