mirror of
https://github.com/HDFGroup/hdf5.git
synced 2026-09-25 04:09:44 +03:00
Allen Byrne
b754dcb8f2
FFM build requires Java 25, Jextract 25. Generates FFM bindings during configure. JNI is default when the requirements are not met or can be forced. Presets added for maven and FFM - JNI is default selection. Enhanced Maven options will work with either JNI or FFM New Workflows for testing and maven uploads. Extensive documentation changes for java.
250 lines
8.6 KiB
Java
250 lines
8.6 KiB
Java
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
|
|
* 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 LICENSE 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.
|
|
************************************************************/
|
|
|
|
import hdf.hdf5lib.H5;
|
|
import hdf.hdf5lib.HDF5Constants;
|
|
|
|
public class H5Ex_D_Transform {
|
|
|
|
private static String FILENAME = "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(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 {
|
|
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(FILENAME, 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();
|
|
}
|
|
}
|