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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 data to a
+ dataset by hyberslabs. The program first writes integers
+ in a hyperslab selection to a dataset with dataspace
+ dimensions of DIM_XxDIM_Y, then closes the file. Next, it
+ reopens the file, reads back the data, and outputs it to
+ the screen. Finally it reads the data again using a
+ different hyperslab selection, and outputs the result to
+ the screen.
+ ************************************************************/
+
+import hdf.hdf5lib.H5;
+import hdf.hdf5lib.HDF5Constants;
+
+public class H5Ex_D_Hyperslab {
+ private static String FILENAME = "H5Ex_D_Hyperslab.h5";
+ private static String DATASETNAME = "DS1";
+ private static final int DIM_X = 6;
+ private static final int DIM_Y = 8;
+ private static final int RANK = 2;
+
+ private static void writeHyperslab()
+ {
+ long file_id = HDF5Constants.H5I_INVALID_HID;
+ long filespace_id = HDF5Constants.H5I_INVALID_HID;
+ long dataset_id = HDF5Constants.H5I_INVALID_HID;
+ long[] dims = {DIM_X, DIM_Y};
+ int[][] dset_data = new int[DIM_X][DIM_Y];
+
+ // Initialize data to "1", to make it easier to see the selections.
+ for (int indx = 0; indx < DIM_X; indx++)
+ for (int jndx = 0; jndx < DIM_Y; jndx++)
+ dset_data[indx][jndx] = 1;
+
+ // Print the data to the screen.
+ System.out.println("Original Data:");
+ for (int indx = 0; indx < DIM_X; indx++) {
+ System.out.print(" [ ");
+ for (int jndx = 0; jndx < DIM_Y; jndx++)
+ System.out.print(dset_data[indx][jndx] + " ");
+ System.out.println("]");
+ }
+ System.out.println();
+
+ // 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 {
+ filespace_id = H5.H5Screate_simple(RANK, dims, null);
+ }
+ catch (Exception e) {
+ e.printStackTrace();
+ }
+
+ // Create the dataset. We will use all default properties for this example.
+ try {
+ if ((file_id >= 0) && (filespace_id >= 0))
+ dataset_id = H5.H5Dcreate(file_id, DATASETNAME, HDF5Constants.H5T_STD_I32LE, filespace_id,
+ HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT,
+ HDF5Constants.H5P_DEFAULT);
+ }
+ catch (Exception e) {
+ e.printStackTrace();
+ }
+
+ // Define and select the first part of the hyperslab selection.
+ long[] start = {0, 0};
+ long[] stride = {3, 3};
+ long[] count = {2, 3};
+ long[] block = {2, 2};
+ try {
+ if ((filespace_id >= 0))
+ H5.H5Sselect_hyperslab(filespace_id, HDF5Constants.H5S_SELECT_SET, start, stride, count,
+ block);
+ }
+ catch (Exception e) {
+ e.printStackTrace();
+ }
+ // Define and select the second part of the hyperslab selection,
+ // which is subtracted from the first selection by the use of
+ // H5S_SELECT_NOTB
+ block[0] = 1;
+ block[1] = 1;
+ try {
+ if ((filespace_id >= 0)) {
+ H5.H5Sselect_hyperslab(filespace_id, HDF5Constants.H5S_SELECT_NOTB, start, stride, count,
+ block);
+
+ // Write the data to the dataset.
+ if (dataset_id >= 0)
+ H5.H5Dwrite(dataset_id, HDF5Constants.H5T_NATIVE_INT, HDF5Constants.H5S_ALL, filespace_id,
+ 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();
+ }
+
+ 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 readHyperslab()
+ {
+ long file_id = HDF5Constants.H5I_INVALID_HID;
+ long filespace_id = HDF5Constants.H5I_INVALID_HID;
+ long dataset_id = HDF5Constants.H5I_INVALID_HID;
+ long dcpl_id = HDF5Constants.H5I_INVALID_HID;
+ int[][] dset_data = new int[DIM_X][DIM_Y];
+
+ // 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();
+ }
+
+ // 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 to disk by hyberslabs:");
+ for (int indx = 0; indx < DIM_X; indx++) {
+ System.out.print(" [ ");
+ for (int jndx = 0; jndx < DIM_Y; jndx++)
+ System.out.print(dset_data[indx][jndx] + " ");
+ System.out.println("]");
+ }
+ System.out.println();
+
+ // Initialize the read array.
+ for (int indx = 0; indx < DIM_X; indx++)
+ for (int jndx = 0; jndx < DIM_Y; jndx++)
+ dset_data[indx][jndx] = 0;
+
+ // Define and select the hyperslab to use for reading.
+ try {
+ if (dataset_id >= 0) {
+ filespace_id = H5.H5Dget_space(dataset_id);
+
+ long[] start = {0, 1};
+ long[] stride = {4, 4};
+ long[] count = {2, 2};
+ long[] block = {2, 3};
+
+ if (filespace_id >= 0) {
+ H5.H5Sselect_hyperslab(filespace_id, HDF5Constants.H5S_SELECT_SET, start, stride, count,
+ block);
+
+ // Read the data using the previously defined hyperslab.
+ if ((dataset_id >= 0) && (filespace_id >= 0))
+ H5.H5Dread(dataset_id, HDF5Constants.H5T_NATIVE_INT, HDF5Constants.H5S_ALL,
+ filespace_id, HDF5Constants.H5P_DEFAULT, dset_data);
+ }
+ }
+ }
+ catch (Exception e) {
+ e.printStackTrace();
+ }
+
+ // Output the data to the screen.
+ System.out.println("Data as read from disk by hyberslab:");
+ for (int indx = 0; indx < DIM_X; indx++) {
+ System.out.print(" [ ");
+ for (int jndx = 0; jndx < DIM_Y; jndx++)
+ System.out.print(dset_data[indx][jndx] + " ");
+ System.out.println("]");
+ }
+ System.out.println();
+
+ // End access to the dataset and release resources used by it.
+ try {
+ if (dcpl_id >= 0)
+ H5.H5Pclose(dcpl_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();
+ }
+ }
+
+ public static void main(String[] args)
+ {
+ H5Ex_D_Hyperslab.writeHyperslab();
+ H5Ex_D_Hyperslab.readHyperslab();
+ }
+}
generated by cgit v0.12 at 2024-06-26 03:14:37 (GMT)