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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Copyright by The HDF Group. *
* Copyright by the Board of Trustees of the University of Illinois. *
* 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. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
import hdf.hdf5lib.H5;
import hdf.hdf5lib.HDF5Constants;
/**
* <p>
* Title: HDF Native Package (Java) Example
* </p>
* <p>
* Description: this example shows how to create/read/write HDF attribute using
* the "HDF Native Package (Java)". The example creates an attribute and, read
* and write the attribute value:
*
* <pre>
* "/" (root)
* 2D 32-bit integer 20x10
* (attribute: name="data range", value=[0, 10000])
* </pre>
*
* </p>
*/
public class HDF5AttributeCreate {
private static String fname = "HDF5AttributeCreate.h5";
private static String dsname = "2D 32-bit integer 20x10";
private static String attrname = "data range";
private static long[] dims2D = {20, 10};
private static void CreateDatasetAttribute()
{
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;
// create the file and add groups and dataset into the file
try {
createFile();
}
catch (Exception e) {
e.printStackTrace();
}
// Open file using the default properties.
try {
file_id = H5.H5Fopen(fname, HDF5Constants.H5F_ACC_RDWR, HDF5Constants.H5P_DEFAULT);
}
catch (Exception e) {
e.printStackTrace();
}
// Open dataset using the default properties.
try {
if (file_id >= 0)
dataset_id = H5.H5Dopen(file_id, dsname, HDF5Constants.H5P_DEFAULT);
}
catch (Exception e) {
e.printStackTrace();
}
long[] attrDims = {2}; // 1D of size two
int[] attrValue = {0, 10000}; // attribute value
// Create the data space for the attribute.
try {
dataspace_id = H5.H5Screate_simple(1, attrDims, null);
}
catch (Exception e) {
e.printStackTrace();
}
// Create a dataset attribute.
try {
if ((dataset_id >= 0) && (dataspace_id >= 0))
attribute_id = H5.H5Acreate(dataset_id, attrname, HDF5Constants.H5T_STD_I32BE, dataspace_id,
HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT);
}
catch (Exception e) {
e.printStackTrace();
}
// Write the attribute data.
try {
if (attribute_id >= 0)
H5.H5Awrite(attribute_id, HDF5Constants.H5T_NATIVE_INT, attrValue);
}
catch (Exception e) {
e.printStackTrace();
}
// Close the attribute.
try {
if (attribute_id >= 0)
H5.H5Aclose(attribute_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();
}
try {
if (dataset_id >= 0)
attribute_id = H5.H5Aopen_by_name(dataset_id, ".", attrname, 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, attrDims, null);
}
catch (Exception e) {
e.printStackTrace();
}
// Allocate array of pointers to two-dimensional arrays (the
// elements of the dataset.
int[] attrData = new int[(int)attrDims[0]];
// Read data.
try {
if (attribute_id >= 0)
H5.H5Aread(attribute_id, HDF5Constants.H5T_NATIVE_INT, attrData);
}
catch (Exception e) {
e.printStackTrace();
}
// print out attribute value
System.out.println(attrname);
System.out.println(attrData[0] + " " + attrData[1]);
// Close the dataspace.
try {
if (dataspace_id >= 0)
H5.H5Sclose(dataspace_id);
}
catch (Exception e) {
e.printStackTrace();
}
// Close to the dataset.
try {
if (dataset_id >= 0)
H5.H5Dclose(dataset_id);
}
catch (Exception e) {
e.printStackTrace();
}
// Close the file.
try {
if (file_id >= 0)
H5.H5Fclose(file_id);
}
catch (Exception e) {
e.printStackTrace();
}
}
/**
* create the file and add groups and dataset into the file, which is the
* same as javaExample.H5DatasetCreate
*
* @see javaExample.HDF5DatasetCreate
* @throws Exception
*/
private static void createFile() throws Exception
{
long file_id = HDF5Constants.H5I_INVALID_HID;
long dataspace_id = HDF5Constants.H5I_INVALID_HID;
long dataset_id = HDF5Constants.H5I_INVALID_HID;
// Create a new file using default properties.
try {
file_id = H5.H5Fcreate(fname, HDF5Constants.H5F_ACC_TRUNC, HDF5Constants.H5P_DEFAULT,
HDF5Constants.H5P_DEFAULT);
}
catch (Exception e) {
e.printStackTrace();
}
// Create the data space for the dataset.
try {
dataspace_id = H5.H5Screate_simple(2, dims2D, null);
}
catch (Exception e) {
e.printStackTrace();
}
// Create the dataset.
try {
if ((file_id >= 0) && (dataspace_id >= 0))
dataset_id = H5.H5Dcreate(file_id, dsname, HDF5Constants.H5T_STD_I32LE, dataspace_id,
HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT,
HDF5Constants.H5P_DEFAULT);
}
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();
}
// set the data values
int[] dataIn = new int[20 * 10];
for (int i = 0; i < 20; i++) {
for (int j = 0; j < 10; j++) {
dataIn[i * 10 + j] = i * 100 + j;
}
}
// Write the data to the dataset.
try {
if (dataset_id >= 0)
H5.H5Dwrite(dataset_id, HDF5Constants.H5T_NATIVE_INT, HDF5Constants.H5S_ALL,
HDF5Constants.H5S_ALL, HDF5Constants.H5P_DEFAULT, dataIn);
}
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();
}
// Close the file.
try {
if (file_id >= 0)
H5.H5Fclose(file_id);
}
catch (Exception e) {
e.printStackTrace();
}
}
public static void main(String[] args) { HDF5AttributeCreate.CreateDatasetAttribute(); }
}
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