/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * 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. * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ /************************************************************ Create two datasets within groups. ************************************************************/ import static org.hdfgroup.javahdf5.hdf5_h.*; import java.lang.foreign.Arena; import java.lang.foreign.MemorySegment; import java.lang.foreign.ValueLayout; public class HDF5GroupDatasetCreate { private static String FILENAME = "HDF5GroupDatasetCreate.h5"; private static String GROUPNAME = "MyGroup"; private static String GROUPNAME_A = "GroupA"; private static String DATASETNAME1 = "dset1"; private static String DATASETNAME2 = "dset2"; private static final int DIM1_X = 3; private static final int DIM1_Y = 3; private static final int DIM2_X = 2; private static final int DIM2_Y = 10; private static void h5_crtgrpd(Arena arena) { long file_id = H5I_INVALID_HID(); long dataspace_id = H5I_INVALID_HID(); long dataset_id = H5I_INVALID_HID(); long group_id = H5I_INVALID_HID(); long group1_id = H5I_INVALID_HID(); long group2_id = H5I_INVALID_HID(); int[][] dset1_data = new int[DIM1_X][DIM1_Y]; int[][] dset2_data = new int[DIM2_X][DIM2_Y]; long[] dims1 = {DIM1_X, DIM1_Y}; long[] dims2 = {DIM2_X, DIM2_Y}; // Initialize the first dataset. for (int indx = 0; indx < DIM1_X; indx++) for (int jndx = 0; jndx < DIM1_Y; jndx++) dset1_data[indx][jndx] = jndx + 1; // Initialize the second dataset. for (int indx = 0; indx < DIM2_X; indx++) for (int jndx = 0; jndx < DIM2_Y; jndx++) dset2_data[indx][jndx] = jndx + 1; // Create a file. try { file_id = H5Fcreate(arena.allocateFrom(FILENAME), H5F_ACC_TRUNC(), H5P_DEFAULT(), H5P_DEFAULT()); // Create a group named "/MyGroup" in the file. if (file_id >= 0) { group1_id = H5Gcreate2(file_id, arena.allocateFrom("/" + GROUPNAME), H5P_DEFAULT(), H5P_DEFAULT(), H5P_DEFAULT()); // Create group "Group_A" in group "MyGroup" using absolute name. if (group1_id >= 0) { group2_id = H5Gcreate2(file_id, arena.allocateFrom("/" + GROUPNAME + "/" + GROUPNAME_A), H5P_DEFAULT(), H5P_DEFAULT(), H5P_DEFAULT()); if (group2_id >= 0) H5Gclose(group2_id); } if (group1_id >= 0) H5Gclose(group1_id); } } catch (Exception e) { e.printStackTrace(); } // Create the data space for the first dataset. try { dataspace_id = H5Screate_simple(2, arena.allocateFrom(ValueLayout.JAVA_LONG, dims1), MemorySegment.NULL); } catch (Exception e) { e.printStackTrace(); } // Create the dataset in group "MyGroup". try { if ((file_id >= 0) && (dataspace_id >= 0)) dataset_id = H5Dcreate2(file_id, arena.allocateFrom("/" + GROUPNAME + "/" + DATASETNAME1), H5T_STD_I32BE_g(), dataspace_id, H5P_DEFAULT(), H5P_DEFAULT(), H5P_DEFAULT()); } catch (Exception e) { e.printStackTrace(); } // Write the first dataset. try { if (dataset_id >= 0) { // Flatten 2D array to 1D for MemorySegment int[] flatData1 = new int[DIM1_X * DIM1_Y]; for (int i = 0; i < DIM1_X; i++) for (int j = 0; j < DIM1_Y; j++) flatData1[i * DIM1_Y + j] = dset1_data[i][j]; MemorySegment dataSeg1 = arena.allocateFrom(ValueLayout.JAVA_INT, flatData1); H5Dwrite(dataset_id, H5T_NATIVE_INT_g(), H5S_ALL(), H5S_ALL(), H5P_DEFAULT(), dataSeg1); } } catch (Exception e) { e.printStackTrace(); } // Close the data space for the first dataset. try { if (dataspace_id >= 0) H5Sclose(dataspace_id); dataspace_id = H5I_INVALID_HID(); } catch (Exception e) { e.printStackTrace(); } // Close the first dataset. try { if (dataset_id >= 0) H5Dclose(dataset_id); dataset_id = H5I_INVALID_HID(); } catch (Exception e) { e.printStackTrace(); } // Open an existing group of the specified file. try { if (file_id >= 0) group_id = H5Gopen2(file_id, arena.allocateFrom("/" + GROUPNAME + "/" + GROUPNAME_A), H5P_DEFAULT()); } catch (Exception e) { e.printStackTrace(); } // Create the data space for the second dataset. try { dataspace_id = H5Screate_simple(2, arena.allocateFrom(ValueLayout.JAVA_LONG, dims2), MemorySegment.NULL); } catch (Exception e) { e.printStackTrace(); } // Create the second dataset in group "Group_A". try { if ((group_id >= 0) && (dataspace_id >= 0)) dataset_id = H5Dcreate2(group_id, arena.allocateFrom(DATASETNAME2), H5T_STD_I32BE_g(), dataspace_id, H5P_DEFAULT(), H5P_DEFAULT(), H5P_DEFAULT()); } catch (Exception e) { e.printStackTrace(); } // Write the second dataset. try { if (dataset_id >= 0) { // Flatten 2D array to 1D for MemorySegment int[] flatData2 = new int[DIM2_X * DIM2_Y]; for (int i = 0; i < DIM2_X; i++) for (int j = 0; j < DIM2_Y; j++) flatData2[i * DIM2_Y + j] = dset2_data[i][j]; MemorySegment dataSeg2 = arena.allocateFrom(ValueLayout.JAVA_INT, flatData2); H5Dwrite(dataset_id, H5T_NATIVE_INT_g(), H5S_ALL(), H5S_ALL(), H5P_DEFAULT(), dataSeg2); } } catch (Exception e) { e.printStackTrace(); } // Close the data space for the second dataset. try { if (dataspace_id >= 0) H5Sclose(dataspace_id); } catch (Exception e) { e.printStackTrace(); } // Close the second dataset. try { if (dataset_id >= 0) H5Dclose(dataset_id); } catch (Exception e) { e.printStackTrace(); } // Close the group. try { if (group_id >= 0) H5Gclose(group_id); } catch (Exception e) { e.printStackTrace(); } // Close the file. try { if (file_id >= 0) H5Fclose(file_id); } catch (Exception e) { e.printStackTrace(); } } public static void main(String[] args) { try (Arena arena = Arena.ofConfined()) { HDF5GroupDatasetCreate.h5_crtgrpd(arena); } } }