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* commit '54957d37f5aa73912763dbb6e308555e863c43f4': Commit copyright header change for src/H5PLpkg.c which was added after running script to make changes. Add new files in release_docs to MANIFEST. Cimmit changes to Makefile.in(s) and H5PL.c that resulted from running autogen.sh. Merge pull request #407 in HDFFV/hdf5 from ~LRKNOX/hdf5_lrk:hdf5_1_10_1 to hdf5_1_10_1 Change copyright headers to replace url referring to file to be removed and replace it with new url for COPYING file.
249 lines
8.3 KiB
Java
249 lines
8.3 KiB
Java
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
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* Copyright by The HDF Group. *
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* Copyright by the Board of Trustees of the University of Illinois. *
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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://support.hdfgroup.org/ftp/HDF5/releases. *
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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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long file_id = -1;
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long filespace_id = -1;
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long dataset_id = -1;
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long dxpl_id = -1;
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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, 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, HDF5Constants.H5S_ALL,
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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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long file_id = -1;
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long dataset_id = -1;
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long dxpl_id = -1;
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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, HDF5Constants.H5S_ALL,
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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, HDF5Constants.H5S_ALL,
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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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H5Ex_D_Transform.writeData();
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H5Ex_D_Transform.readData();
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}
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}
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