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H5Ex_T_FloatAttribute.java
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H5Ex_T_FloatAttribute.java
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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 *
* [email protected]. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/************************************************************
This example shows how to read and write floating point
datatypes to an attribute. The program first writes
floating point numbers to an attribute with a dataspace of
DIM0xDIM1, then closes the file. Next, it reopens the
file, reads back the data, and outputs it to the screen.
************************************************************/
import java.text.DecimalFormat;
import java.text.DecimalFormatSymbols;
import java.util.Locale;
import hdf.hdf5lib.H5;
import hdf.hdf5lib.HDF5Constants;
public class H5Ex_T_FloatAttribute {
private static String FILENAME = "H5Ex_T_FloatAttribute.h5";
private static String DATASETNAME = "DS1";
private static String ATTRIBUTENAME = "A1";
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 attribute_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 dataset with a scalar dataspace.
try {
dataspace_id = H5.H5Screate(HDF5Constants.H5S_SCALAR);
if (dataspace_id >= 0) {
dataset_id = H5.H5Dcreate(file_id, DATASETNAME, HDF5Constants.H5T_STD_I32LE, dataspace_id,
HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT,
HDF5Constants.H5P_DEFAULT);
H5.H5Sclose(dataspace_id);
dataspace_id = HDF5Constants.H5I_INVALID_HID;
}
}
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 attribute and write the array data to it.
try {
if ((dataset_id >= 0) && (dataspace_id >= 0))
attribute_id =
H5.H5Acreate(dataset_id, ATTRIBUTENAME, HDF5Constants.H5T_IEEE_F64LE, dataspace_id,
HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT);
}
catch (Exception e) {
e.printStackTrace();
}
// Write the dataset.
try {
if (attribute_id >= 0)
H5.H5Awrite(attribute_id, HDF5Constants.H5T_NATIVE_DOUBLE, dset_data);
}
catch (Exception e) {
e.printStackTrace();
}
// End access to the dataset and release resources used by it.
try {
if (attribute_id >= 0)
H5.H5Aclose(attribute_id);
}
catch (Exception e) {
e.printStackTrace();
}
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 attribute_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();
}
try {
if (dataset_id >= 0)
attribute_id = H5.H5Aopen_by_name(dataset_id, ".", ATTRIBUTENAME, HDF5Constants.H5P_DEFAULT,
HDF5Constants.H5P_DEFAULT);
}
catch (Exception e) {
e.printStackTrace();
}
// Get dataspace and allocate memory for read buffer.
try {
if (attribute_id >= 0)
dataspace_id = H5.H5Aget_space(attribute_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 (attribute_id >= 0)
H5.H5Aread(attribute_id, HDF5Constants.H5T_NATIVE_DOUBLE, 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(ATTRIBUTENAME + ":");
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 (attribute_id >= 0)
H5.H5Aclose(attribute_id);
}
catch (Exception e) {
e.printStackTrace();
}
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_FloatAttribute.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_FloatAttribute.ReadDataset();
}
}