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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 integer datatypes
- to a dataset. The program first writes integers to a
- dataset with a dataspace of DIM0xDIM1, then closes the
- file. Next, it reopens the file, reads back the data, and
- outputs it to the screen.
- ************************************************************/
-
-package examples.datatypes;
-
-import java.text.DecimalFormat;
-import java.text.DecimalFormatSymbols;
-import java.util.Locale;
-
-import hdf.hdf5lib.H5;
-import hdf.hdf5lib.HDF5Constants;
-
-public class H5Ex_T_Float {
- private static String FILENAME = "H5Ex_T_Float.h5";
- private static String DATASETNAME = "DS1";
- private static final int DIM0 = 4;
- private static final int DIM1 = 7;
- private static final int RANK = 2;
-
- private static void CreateDataset()
- {
- long file_id = HDF5Constants.H5I_INVALID_HID;
- long dataspace_id = HDF5Constants.H5I_INVALID_HID;
- long dataset_id = HDF5Constants.H5I_INVALID_HID;
- long[] dims = {DIM0, DIM1};
- double[][] dset_data = new double[DIM0][DIM1];
-
- // Initialize data.
- for (int indx = 0; indx < DIM0; indx++)
- for (int jndx = 0; jndx < DIM1; jndx++) {
- dset_data[indx][jndx] = indx / (jndx + 0.5) + jndx;
- }
-
- // 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 {
- dataspace_id = H5.H5Screate_simple(RANK, dims, null);
- }
- catch (Exception e) {
- e.printStackTrace();
- }
-
- // Create the dataset and write the floating point data to it. In
- // this example we will save the data as 64 bit little endian IEEE
- // floating point numbers, regardless of the native type. The HDF5
- // library automatically converts between different floating point
- // types.
- try {
- if ((file_id >= 0) && (dataspace_id >= 0))
- dataset_id = H5.H5Dcreate(file_id, DATASETNAME, HDF5Constants.H5T_IEEE_F64LE, dataspace_id,
- HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT,
- HDF5Constants.H5P_DEFAULT);
- }
- catch (Exception e) {
- e.printStackTrace();
- }
-
- // Write the data to the dataset.
- try {
- if (dataset_id >= 0)
- H5.H5Dwrite(dataset_id, HDF5Constants.H5T_NATIVE_DOUBLE, HDF5Constants.H5S_ALL,
- HDF5Constants.H5S_ALL, 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();
- }
-
- // Terminate access to the data space.
- try {
- if (dataspace_id >= 0)
- H5.H5Sclose(dataspace_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 ReadDataset()
- {
- long file_id = HDF5Constants.H5I_INVALID_HID;
- long dataspace_id = HDF5Constants.H5I_INVALID_HID;
- long dataset_id = HDF5Constants.H5I_INVALID_HID;
- long[] dims = {DIM0, DIM1};
- double[][] dset_data;
-
- // 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();
- }
-
- // Get dataspace and allocate memory for read buffer.
- try {
- if (dataset_id >= 0)
- dataspace_id = H5.H5Dget_space(dataset_id);
- }
- catch (Exception e) {
- e.printStackTrace();
- }
-
- try {
- if (dataspace_id >= 0)
- H5.H5Sget_simple_extent_dims(dataspace_id, dims, null);
- }
- catch (Exception e) {
- e.printStackTrace();
- }
-
- // Allocate array of pointers to two-dimensional arrays (the
- // elements of the dataset.
- dset_data = new double[(int)dims[0]][(int)(dims[1])];
-
- // Read data.
- try {
- if (dataset_id >= 0)
- H5.H5Dread(dataset_id, HDF5Constants.H5T_NATIVE_DOUBLE, HDF5Constants.H5S_ALL,
- HDF5Constants.H5S_ALL, HDF5Constants.H5P_DEFAULT, dset_data);
- }
- catch (Exception e) {
- e.printStackTrace();
- }
-
- // Output the data to the screen.
- DecimalFormat df = new DecimalFormat("#,##0.0000", new DecimalFormatSymbols(Locale.US));
- System.out.println(DATASETNAME + ":");
- for (int indx = 0; indx < dims[0]; indx++) {
- System.out.print(" [");
- for (int jndx = 0; jndx < dims[1]; jndx++) {
- System.out.print(" " + df.format(dset_data[indx][jndx]));
- }
- System.out.println("]");
- }
- System.out.println();
-
- // 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();
- }
-
- // Terminate access to the data space.
- try {
- if (dataspace_id >= 0)
- H5.H5Sclose(dataspace_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_T_Float.CreateDataset();
- // Now we begin the read section of this example. Here we assume
- // the dataset and array have the same name and rank, but can have
- // any size. Therefore we must allocate a new array to read in
- // data using malloc().
- H5Ex_T_Float.ReadDataset();
- }
-}
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