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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 object references
+ to a dataset. The program first creates objects in the
+ file and writes references to those objects to a dataset
+ with a dataspace of DIM0, then closes the file. Next, it
+ reopens the file, dereferences the references, and outputs
+ the names of their targets to the screen.
+ ************************************************************/
+
+import java.util.EnumSet;
+import java.util.HashMap;
+import java.util.Map;
+
+import hdf.hdf5lib.H5;
+import hdf.hdf5lib.HDF5Constants;
+
+public class H5Ex_T_RegionReference {
+ private static String FILENAME = "H5Ex_T_RegionReference.h5";
+ private static String DATASETNAME = "DS1";
+ private static String DATASETNAME2 = "DS2";
+ private static String GROUPNAME = "G1";
+ private static final int DIM0 = 2;
+ private static final int DS2DIM0 = 3;
+ private static final int DS2DIM1 = 16;
+ private static final int RANK = 1;
+
+ private static void writeRegRef()
+ {
+ long file_id = HDF5Constants.H5I_INVALID_HID;
+ long dataspace_id = HDF5Constants.H5I_INVALID_HID;
+ long filespace_id = HDF5Constants.H5I_INVALID_HID;
+ long group_id = HDF5Constants.H5I_INVALID_HID;
+ long dataset_id = HDF5Constants.H5I_INVALID_HID;
+ long[] dims = {DIM0};
+ long[] dims2 = {DS2DIM0, DS2DIM1};
+ // data buffer for writing region reference
+ byte[][] dset_data = new byte[DIM0][HDF5Constants.H5R_REF_BUF_SIZE];
+ // data buffer for writing dataset
+ byte[][] write_data = new byte[DS2DIM0][DS2DIM1];
+ StringBuffer[] str_data = {new StringBuffer("The quick brown"), new StringBuffer("fox jumps over "),
+ new StringBuffer("the 5 lazy dogs")};
+
+ // 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 character data.
+ try {
+ dataspace_id = H5.H5Screate_simple(2, dims2, null);
+ if ((file_id >= 0) && (dataspace_id >= 0)) {
+ dataset_id = H5.H5Dcreate(file_id, DATASETNAME2, HDF5Constants.H5T_STD_I8LE, dataspace_id,
+ HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT,
+ HDF5Constants.H5P_DEFAULT);
+ for (int indx = 0; indx < DS2DIM0; indx++) {
+ for (int jndx = 0; jndx < DS2DIM1; jndx++) {
+ if (jndx < str_data[indx].length())
+ write_data[indx][jndx] = (byte)str_data[indx].charAt(jndx);
+ else
+ write_data[indx][jndx] = 0;
+ }
+ }
+ H5.H5Dwrite(dataset_id, HDF5Constants.H5T_NATIVE_CHAR, HDF5Constants.H5S_ALL,
+ HDF5Constants.H5S_ALL, HDF5Constants.H5P_DEFAULT, write_data);
+ }
+ }
+ catch (Exception e) {
+ e.printStackTrace();
+ }
+
+ // Create reference to a list of elements in dset2.
+ try {
+ long[][] coords = {{0, 1}, {2, 11}, {1, 0}, {2, 4}};
+
+ H5.H5Sselect_elements(dataspace_id, HDF5Constants.H5S_SELECT_SET, 4, coords);
+ if (file_id >= 0)
+ dset_data[0] =
+ H5.H5Rcreate_region(file_id, DATASETNAME2, dataspace_id, HDF5Constants.H5P_DEFAULT);
+ }
+ catch (Exception ex) {
+ ex.printStackTrace();
+ }
+
+ // Create reference to a hyperslab in dset2.
+ try {
+ long[] start = {0, 0}; // Starting location of hyperslab
+ long[] stride = {2, 11}; // Stride of hyperslab
+ long[] count = {2, 2}; // Element count of hyperslab
+ long[] block = {1, 3}; // Block size of hyperslab
+
+ H5.H5Sselect_hyperslab(dataspace_id, HDF5Constants.H5S_SELECT_SET, start, stride, count, block);
+ if (file_id >= 0)
+ dset_data[1] =
+ H5.H5Rcreate_region(file_id, DATASETNAME2, dataspace_id, HDF5Constants.H5P_DEFAULT);
+ ;
+ }
+ catch (Exception e) {
+ e.printStackTrace();
+ }
+
+ try {
+ H5.H5Sclose(dataspace_id);
+ }
+ catch (Exception e) {
+ }
+
+ // Create the dataset and write the region references to it.
+ try {
+ dataspace_id = H5.H5Screate_simple(1, dims, null);
+ if ((file_id >= 0) && (dataspace_id >= 0)) {
+ dataset_id = H5.H5Dcreate(file_id, DATASETNAME, HDF5Constants.H5T_STD_REF, dataspace_id,
+ HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT,
+ HDF5Constants.H5P_DEFAULT);
+ H5.H5Dwrite(dataset_id, HDF5Constants.H5T_STD_REF, HDF5Constants.H5S_ALL,
+ HDF5Constants.H5S_ALL, HDF5Constants.H5P_DEFAULT, dset_data);
+ }
+ }
+ catch (Exception e) {
+ e.printStackTrace();
+ }
+
+ try {
+ H5.H5Rdestroy(dset_data[0]);
+ }
+ catch (Exception ex) {
+ }
+
+ try {
+ H5.H5Rdestroy(dset_data[1]);
+ }
+ catch (Exception ex) {
+ }
+
+ // End access to the dataset and release resources used by it.
+ try {
+ H5.H5Sclose(dataspace_id);
+ }
+ catch (Exception e) {
+ }
+
+ 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 readRegRef()
+ {
+ long file_id = HDF5Constants.H5I_INVALID_HID;
+ long dataset_id = HDF5Constants.H5I_INVALID_HID;
+ long dataspace_id = HDF5Constants.H5I_INVALID_HID;
+ int object_type = -1;
+ long object_id = HDF5Constants.H5I_INVALID_HID;
+ long region_id = HDF5Constants.H5I_INVALID_HID;
+ long[] dims = {DIM0};
+ byte[][] dset_data = new byte[DIM0][HDF5Constants.H5R_REF_BUF_SIZE];
+ StringBuffer str_data;
+
+ // Open an existing file.
+ try {
+ file_id = H5.H5Fopen(FILENAME, HDF5Constants.H5F_ACC_RDONLY, HDF5Constants.H5P_DEFAULT);
+
+ // Open an existing dataset.
+ try {
+ dataset_id = H5.H5Dopen(file_id, DATASETNAME, HDF5Constants.H5P_DEFAULT);
+
+ try {
+ // Get dataspace and allocate memory for read buffer.
+ dataspace_id = H5.H5Dget_space(dataset_id);
+ H5.H5Sget_simple_extent_dims(dataspace_id, dims, null);
+
+ // Read data.
+ H5.H5Dread(dataset_id, HDF5Constants.H5T_STD_REF, HDF5Constants.H5S_ALL,
+ HDF5Constants.H5S_ALL, HDF5Constants.H5P_DEFAULT, dset_data);
+
+ // Output the data to the screen.
+ for (int indx = 0; indx < dims[0]; indx++) {
+ System.out.println(DATASETNAME + "[" + indx + "]:");
+ System.out.print(" ->");
+ // Open the referenced object.
+ try {
+ object_id = H5.H5Ropen_object(dset_data[indx], HDF5Constants.H5P_DEFAULT,
+ HDF5Constants.H5P_DEFAULT);
+ try {
+ String obj_name = H5.H5Iget_name(object_id);
+
+ region_id = H5.H5Ropen_region(dset_data[indx], HDF5Constants.H5P_DEFAULT,
+ HDF5Constants.H5P_DEFAULT);
+ if ((object_id >= 0) && (region_id >= 0)) {
+ try {
+ long reg_npoints = H5.H5Sget_select_npoints(region_id);
+ long[] dims2 = new long[1];
+ dims2[0] = (int)reg_npoints;
+ dataspace_id = H5.H5Screate_simple(1, dims2, null);
+
+ // Read data.
+ byte[] refbuf = new byte[(int)reg_npoints + 1];
+ H5.H5Dread(object_id, HDF5Constants.H5T_NATIVE_CHAR, dataspace_id,
+ region_id, HDF5Constants.H5P_DEFAULT, refbuf);
+ refbuf[(int)reg_npoints] = 0;
+ str_data = new StringBuffer(new String(refbuf).trim());
+
+ System.out.println(" " + obj_name + ": " + str_data);
+ }
+ catch (Throwable err2) {
+ err2.printStackTrace();
+ }
+ }
+ }
+ catch (Throwable err1) {
+ err1.printStackTrace();
+ }
+ finally {
+ try {
+ H5.H5Sclose(region_id);
+ }
+ catch (Exception ex) {
+ }
+ }
+ }
+ catch (Throwable err0) {
+ err0.printStackTrace();
+ }
+ finally {
+ try {
+ H5.H5Dclose(object_id);
+ }
+ catch (Exception ex) {
+ }
+ }
+ try {
+ H5.H5Rdestroy(dset_data[indx]);
+ }
+ catch (Exception e4) {
+ }
+ } // end for
+ }
+ catch (Exception e4) {
+ e4.printStackTrace();
+ }
+ finally {
+ try {
+ H5.H5Sclose(dataspace_id);
+ for (int indx = 0; indx < dims[0]; indx++)
+ H5.H5Rdestroy(dset_data[indx]);
+ }
+ catch (Exception e4) {
+ }
+ }
+ }
+ catch (Exception e3) {
+ e3.printStackTrace();
+ }
+ finally {
+ try {
+ H5.H5Dclose(dataset_id);
+ }
+ catch (Exception e3) {
+ }
+ }
+ }
+ catch (Exception e2) {
+ e2.printStackTrace();
+ }
+ finally {
+ try {
+ H5.H5Fclose(file_id);
+ }
+ catch (Exception e2) {
+ }
+ }
+ }
+
+ public static void main(String[] args)
+ {
+ H5Ex_T_RegionReference.writeRegRef();
+ H5Ex_T_RegionReference.readRegRef();
+ }
+}
generated by cgit v0.12 at 2024-06-26 03:31:45 (GMT)