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270 lines
9.3 KiB
Java
270 lines
9.3 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 files COPYING and Copyright.html. COPYING can be found at the root *
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* of the source code distribution tree; Copyright.html can be found at the *
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* root level of an installed copy of the electronic HDF5 document set and *
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* is linked from the top-level documents page. It can also be found at *
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* http://hdfgroup.org/HDF5/doc/Copyright.html. If you do not have *
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* access to either file, you may request a copy from 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
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dataset by hyberslabs. The program first writes integers
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in a hyperslab selection to a dataset with dataspace
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dimensions of DIM_XxDIM_Y, then closes the file. Next, it
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reopens the file, reads back the data, and outputs it to
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the screen. Finally it reads the data again using a
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different hyperslab selection, and outputs the result to
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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_Hyperslab {
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private static String FILENAME = "H5Ex_D_Hyperslab.h5";
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private static String DATASETNAME = "DS1";
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private static final int DIM_X = 6;
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private static final int DIM_Y = 8;
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private static final int RANK = 2;
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private static void writeHyperslab() {
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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[] dims = { DIM_X, DIM_Y };
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int[][] dset_data = new int[DIM_X][DIM_Y];
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// Initialize data to "1", to make it easier to see the selections.
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for (int indx = 0; indx < DIM_X; indx++)
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for (int jndx = 0; jndx < DIM_Y; jndx++)
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dset_data[indx][jndx] = 1;
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// Print the data to the screen.
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System.out.println("Original Data:");
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for (int indx = 0; indx < DIM_X; indx++) {
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System.out.print(" [ ");
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for (int jndx = 0; jndx < DIM_Y; jndx++)
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System.out.print(dset_data[indx][jndx] + " ");
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System.out.println("]");
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}
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System.out.println();
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// Create a new file using default properties.
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try {
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file_id = H5.H5Fcreate(FILENAME, 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(RANK, 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. We will use all default properties for this example.
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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, DATASETNAME, HDF5Constants.H5T_STD_I32LE, 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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// Define and select the first part of the hyperslab selection.
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long[] start = { 0, 0 };
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long[] stride = { 3, 3 };
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long[] count = { 2, 3 };
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long[] block = { 2, 2 };
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try {
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if ((filespace_id >= 0))
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H5.H5Sselect_hyperslab(filespace_id, HDF5Constants.H5S_SELECT_SET, start, stride, count, block);
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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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// Define and select the second part of the hyperslab selection,
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// which is subtracted from the first selection by the use of
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// H5S_SELECT_NOTB
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block[0] = 1;
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block[1] = 1;
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try {
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if ((filespace_id >= 0)) {
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H5.H5Sselect_hyperslab(filespace_id, HDF5Constants.H5S_SELECT_NOTB, start, stride, count, block);
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// Write the data to the dataset.
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if (dataset_id >= 0)
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H5.H5Dwrite(dataset_id, HDF5Constants.H5T_NATIVE_INT, HDF5Constants.H5S_ALL, filespace_id,
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HDF5Constants.H5P_DEFAULT, dset_data);
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}
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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 (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 readHyperslab() {
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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 dcpl_id = -1;
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int[][] dset_data = new int[DIM_X][DIM_Y];
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// Open an existing file.
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try {
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file_id = H5.H5Fopen(FILENAME, 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.
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try {
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if (file_id >= 0)
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dataset_id = H5.H5Dopen(file_id, DATASETNAME, 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 to disk by hyberslabs:");
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for (int indx = 0; indx < DIM_X; indx++) {
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System.out.print(" [ ");
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for (int jndx = 0; jndx < DIM_Y; jndx++)
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System.out.print(dset_data[indx][jndx] + " ");
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System.out.println("]");
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}
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System.out.println();
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// Initialize the read array.
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for (int indx = 0; indx < DIM_X; indx++)
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for (int jndx = 0; jndx < DIM_Y; jndx++)
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dset_data[indx][jndx] = 0;
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// Define and select the hyperslab to use for reading.
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try {
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if (dataset_id >= 0) {
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filespace_id = H5.H5Dget_space(dataset_id);
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long[] start = { 0, 1 };
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long[] stride = { 4, 4 };
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long[] count = { 2, 2 };
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long[] block = { 2, 3 };
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if (filespace_id >= 0) {
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H5.H5Sselect_hyperslab(filespace_id, HDF5Constants.H5S_SELECT_SET, start, stride, count, block);
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// Read the data using the previously defined hyperslab.
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if ((dataset_id >= 0) && (filespace_id >= 0))
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H5.H5Dread(dataset_id, HDF5Constants.H5T_NATIVE_INT, HDF5Constants.H5S_ALL, filespace_id,
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HDF5Constants.H5P_DEFAULT, dset_data);
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}
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}
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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 read from disk by hyberslab:");
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for (int indx = 0; indx < DIM_X; indx++) {
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System.out.print(" [ ");
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for (int jndx = 0; jndx < DIM_Y; jndx++)
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System.out.print(dset_data[indx][jndx] + " ");
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System.out.println("]");
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}
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System.out.println();
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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 (dcpl_id >= 0)
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H5.H5Pclose(dcpl_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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public static void main(String[] args) {
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H5Ex_D_Hyperslab.writeHyperslab();
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H5Ex_D_Hyperslab.readHyperslab();
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}
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}
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