diff options
Diffstat (limited to 'java/examples/datasets/H5Ex_D_Chunk.java')
| -rw-r--r-- | java/examples/datasets/H5Ex_D_Chunk.java | 371 |
1 files changed, 0 insertions, 371 deletions
diff --git a/java/examples/datasets/H5Ex_D_Chunk.java b/java/examples/datasets/H5Ex_D_Chunk.java deleted file mode 100644 index fbfc148..0000000 --- a/java/examples/datasets/H5Ex_D_Chunk.java +++ /dev/null @@ -1,371 +0,0 @@ -/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * - * 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 create a chunked dataset. The - program first writes integers in a hyperslab selection to - a chunked dataset with dataspace dimensions of DIM_XxDIM_Y - and chunk size of CHUNK_XxCHUNK_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. - ************************************************************/ -package examples.datasets; - -import java.util.EnumSet; -import java.util.HashMap; -import java.util.Map; - -import hdf.hdf5lib.H5; -import hdf.hdf5lib.HDF5Constants; - -public class H5Ex_D_Chunk { - private static String FILENAME = "H5Ex_D_Chunk.h5"; - private static String DATASETNAME = "DS1"; - private static final int DIM_X = 6; - private static final int DIM_Y = 8; - private static final int CHUNK_X = 4; - private static final int CHUNK_Y = 4; - private static final int RANK = 2; - private static final int NDIMS = 2; - - // Values for the status of space allocation - enum H5D_layout { - H5D_LAYOUT_ERROR(-1), - H5D_COMPACT(0), - H5D_CONTIGUOUS(1), - H5D_CHUNKED(2), - H5D_VIRTUAL(3), - H5D_NLAYOUTS(4); - private static final Map<Integer, H5D_layout> lookup = new HashMap<Integer, H5D_layout>(); - - static - { - for (H5D_layout s : EnumSet.allOf(H5D_layout.class)) - lookup.put(s.getCode(), s); - } - - private int code; - - H5D_layout(int layout_type) { this.code = layout_type; } - - public int getCode() { return this.code; } - - public static H5D_layout get(int code) { return lookup.get(code); } - } - - private static void writeChunk() - { - 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; - long[] dims = {DIM_X, DIM_Y}; - long[] chunk_dims = {CHUNK_X, CHUNK_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 creation property list. - try { - dcpl_id = H5.H5Pcreate(HDF5Constants.H5P_DATASET_CREATE); - } - catch (Exception e) { - e.printStackTrace(); - } - - // Set the chunk size. - try { - if (dcpl_id >= 0) - H5.H5Pset_chunk(dcpl_id, NDIMS, chunk_dims); - } - catch (Exception e) { - e.printStackTrace(); - } - - // Create the chunked dataset. - try { - if ((file_id >= 0) && (filespace_id >= 0) && (dcpl_id >= 0)) - dataset_id = H5.H5Dcreate(file_id, DATASETNAME, HDF5Constants.H5T_STD_I32LE, filespace_id, - HDF5Constants.H5P_DEFAULT, dcpl_id, 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 (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(); - } - } - - private static void readChunk() - { - 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(); - } - - // Retrieve the dataset creation property list. - try { - if (dataset_id >= 0) - dcpl_id = H5.H5Dget_create_plist(dataset_id); - } - catch (Exception e) { - e.printStackTrace(); - } - - // Print the storage layout. - try { - if (dcpl_id >= 0) { - int layout_type = H5.H5Pget_layout(dcpl_id); - System.out.print("Storage layout for " + DATASETNAME + " is: "); - switch (H5D_layout.get(layout_type)) { - case H5D_COMPACT: - System.out.println("H5D_COMPACT"); - break; - case H5D_CONTIGUOUS: - System.out.println("H5D_CONTIGUOUS"); - break; - case H5D_CHUNKED: - System.out.println("H5D_CHUNKED"); - break; - case H5D_VIRTUAL: - System.out.println("H5D_VIRTUAL"); - break; - case H5D_LAYOUT_ERROR: - break; - case H5D_NLAYOUTS: - break; - default: - break; - } - System.out.println(); - } - } - 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_Chunk.writeChunk(); - H5Ex_D_Chunk.readChunk(); - } -} |