diff options
Diffstat (limited to 'java/examples/datasets/H5Ex_D_FillValue.java')
| -rw-r--r-- | java/examples/datasets/H5Ex_D_FillValue.java | 246 |
1 files changed, 246 insertions, 0 deletions
diff --git a/java/examples/datasets/H5Ex_D_FillValue.java b/java/examples/datasets/H5Ex_D_FillValue.java new file mode 100644 index 0000000..982d2cb --- /dev/null +++ b/java/examples/datasets/H5Ex_D_FillValue.java @@ -0,0 +1,246 @@ +/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * + * Copyright by The HDF Group. * + * Copyright by the Board of Trustees of the University of Illinois. * + * 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 files COPYING and Copyright.html. COPYING can be found at the root * + * of the source code distribution tree; Copyright.html can be found at the * + * root level of an installed copy of the electronic HDF5 document set and * + * is linked from the top-level documents page. It can also be found at * + * http://hdfgroup.org/HDF5/doc/Copyright.html. If you do not have * + * access to either file, you may request a copy from help@hdfgroup.org. * + * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ + +/************************************************************ + This example shows how to set the fill value for a + dataset. The program first sets the fill value to + FILLVAL, creates a dataset with dimensions of DIM_XxDIM_Y, + reads from the uninitialized dataset, and outputs the + contents to the screen. Next, it writes integers to the + dataset, reads the data back, and outputs it to the + screen. Finally it extends the dataset, reads from it, + and outputs the result to the screen. + ************************************************************/ +package examples.datasets; + +import hdf.hdf5lib.H5; +import hdf.hdf5lib.HDF5Constants; + +public class H5Ex_D_FillValue { + private static String FILENAME = "H5Ex_D_FillValue.h5"; + private static String DATASETNAME = "ExtendibleArray"; + private static final int DIM_X = 4; + private static final int DIM_Y = 7; + private static final int EDIM_X = 6; + private static final int EDIM_Y = 10; + 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; + private static final int FILLVAL = 99; + + private static void fillValue() { + long file_id = -1; + long dcpl_id = -1; + long dataspace_id = -1; + long dataset_id = -1; + long[] dims = { DIM_X, DIM_Y }; + long[] extdims = { EDIM_X, EDIM_Y }; + long[] chunk_dims = { CHUNK_X, CHUNK_Y }; + long[] maxdims = { HDF5Constants.H5S_UNLIMITED, HDF5Constants.H5S_UNLIMITED }; + int[][] write_dset_data = new int[DIM_X][DIM_Y]; + int[][] read_dset_data = new int[DIM_X][DIM_Y]; + int[][] extend_dset_data = new int[EDIM_X][EDIM_Y]; + + // Initialize the dataset. + for (int indx = 0; indx < DIM_X; indx++) + for (int jndx = 0; jndx < DIM_Y; jndx++) + write_dset_data[indx][jndx] = indx * jndx - jndx; + + // 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 with unlimited dimensions. + try { + dataspace_id = H5.H5Screate_simple(RANK, dims, maxdims); + } + 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(); + } + + // Set the fill value for the dataset + try { + int[] fill_value = { FILLVAL }; + if (dcpl_id >= 0) + H5.H5Pset_fill_value(dcpl_id, HDF5Constants.H5T_NATIVE_INT, fill_value); + } + catch (Exception e) { + e.printStackTrace(); + } + + // Set the allocation time to "early". This way we can be sure + // that reading from the dataset immediately after creation will + // return the fill value. + try { + if (dcpl_id >= 0) + H5.H5Pset_alloc_time(dcpl_id, HDF5Constants.H5D_ALLOC_TIME_EARLY); + } + catch (Exception e) { + e.printStackTrace(); + } + + // Create the dataset using the dataset creation property list. + try { + if ((file_id >= 0) && (dataspace_id >= 0) && (dcpl_id >= 0)) + dataset_id = H5.H5Dcreate(file_id, DATASETNAME, HDF5Constants.H5T_STD_I32LE, dataspace_id, + HDF5Constants.H5P_DEFAULT, dcpl_id, HDF5Constants.H5P_DEFAULT); + } + catch (Exception e) { + e.printStackTrace(); + } + + // Read values from the dataset, which has not been written to yet. + try { + if (dataset_id >= 0) + H5.H5Dread(dataset_id, HDF5Constants.H5T_NATIVE_INT, HDF5Constants.H5S_ALL, HDF5Constants.H5S_ALL, + HDF5Constants.H5P_DEFAULT, read_dset_data); + } + catch (Exception e) { + e.printStackTrace(); + } + + // Output the data to the screen. + System.out.println("Dataset before being written to:"); + for (int indx = 0; indx < DIM_X; indx++) { + System.out.print(" [ "); + for (int jndx = 0; jndx < DIM_Y; jndx++) + System.out.print(read_dset_data[indx][jndx] + " "); + System.out.println("]"); + } + System.out.println(); + + // Write the data to the dataset. + try { + if (dataset_id >= 0) + H5.H5Dwrite(dataset_id, HDF5Constants.H5T_NATIVE_INT, HDF5Constants.H5S_ALL, HDF5Constants.H5S_ALL, + HDF5Constants.H5P_DEFAULT, write_dset_data); + } + catch (Exception e) { + e.printStackTrace(); + } + + // Read the data back. + try { + if (dataset_id >= 0) + H5.H5Dread(dataset_id, HDF5Constants.H5T_NATIVE_INT, HDF5Constants.H5S_ALL, HDF5Constants.H5S_ALL, + HDF5Constants.H5P_DEFAULT, read_dset_data); + } + catch (Exception e) { + e.printStackTrace(); + } + + // Output the data to the screen. + System.out.println("Dataset after being written to:"); + for (int indx = 0; indx < DIM_X; indx++) { + System.out.print(" [ "); + for (int jndx = 0; jndx < DIM_Y; jndx++) + System.out.print(read_dset_data[indx][jndx] + " "); + System.out.println("]"); + } + System.out.println(); + + // Extend the dataset. + try { + if (dataset_id >= 0) + H5.H5Dset_extent(dataset_id, extdims); + } + catch (Exception e) { + e.printStackTrace(); + } + + // Read from the extended dataset. + try { + if (dataset_id >= 0) + H5.H5Dread(dataset_id, HDF5Constants.H5T_NATIVE_INT, HDF5Constants.H5S_ALL, HDF5Constants.H5S_ALL, + HDF5Constants.H5P_DEFAULT, extend_dset_data); + } + catch (Exception e) { + e.printStackTrace(); + } + + // Output the data to the screen. + System.out.println("Dataset after extension:"); + for (int indx = 0; indx < EDIM_X; indx++) { + System.out.print(" [ "); + for (int jndx = 0; jndx < EDIM_Y; jndx++) + System.out.print(extend_dset_data[indx][jndx] + " "); + System.out.println("]"); + } + System.out.println(); + + // 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 (dataspace_id >= 0) + H5.H5Sclose(dataspace_id); + } + catch (Exception e) { + e.printStackTrace(); + } + + try { + if (dcpl_id >= 0) + H5.H5Pclose(dcpl_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_FillValue.fillValue(); + } + +} |