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Diffstat (limited to 'HDF5Examples/JAVA/H5D/H5Ex_D_Alloc.java')
| -rw-r--r-- | HDF5Examples/JAVA/H5D/H5Ex_D_Alloc.java | 293 |
1 files changed, 293 insertions, 0 deletions
diff --git a/HDF5Examples/JAVA/H5D/H5Ex_D_Alloc.java b/HDF5Examples/JAVA/H5D/H5Ex_D_Alloc.java new file mode 100644 index 0000000..09bb180 --- /dev/null +++ b/HDF5Examples/JAVA/H5D/H5Ex_D_Alloc.java @@ -0,0 +1,293 @@ +/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * + * 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 set the space allocation time + for a dataset. The program first creates two datasets, + one with the default allocation time (late) and one with + early allocation time, and displays whether each has been + allocated and their allocation size. Next, it writes data + to the datasets, and again displays whether each has been + allocated and their allocation size. + ************************************************************/ + +import java.util.EnumSet; +import java.util.HashMap; +import java.util.Map; + +import hdf.hdf5lib.H5; +import hdf.hdf5lib.HDF5Constants; + +public class H5Ex_D_Alloc { + private static String FILENAME = "H5Ex_D_Alloc.h5"; + private static String DATASETNAME1 = "DS1"; + private static String DATASETNAME2 = "DS2"; + private static final int DIM_X = 4; + private static final int DIM_Y = 7; + private static final int FILLVAL = 99; + private static final int RANK = 2; + + // Values for the status of space allocation + enum H5D_space_status { + H5D_SPACE_STATUS_ERROR(-1), + H5D_SPACE_STATUS_NOT_ALLOCATED(0), + H5D_SPACE_STATUS_PART_ALLOCATED(1), + H5D_SPACE_STATUS_ALLOCATED(2); + private static final Map<Integer, H5D_space_status> lookup = new HashMap<Integer, H5D_space_status>(); + + static + { + for (H5D_space_status s : EnumSet.allOf(H5D_space_status.class)) + lookup.put(s.getCode(), s); + } + + private int code; + + H5D_space_status(int space_status) { this.code = space_status; } + + public int getCode() { return this.code; } + + public static H5D_space_status get(int code) { return lookup.get(code); } + } + + private static void allocation() + { + long file_id = HDF5Constants.H5I_INVALID_HID; + long filespace_id = HDF5Constants.H5I_INVALID_HID; + long dataset_id1 = HDF5Constants.H5I_INVALID_HID; + long dataset_id2 = HDF5Constants.H5I_INVALID_HID; + long dcpl_id = HDF5Constants.H5I_INVALID_HID; + long[] dims = {DIM_X, DIM_Y}; + int[][] dset_data = new int[DIM_X][DIM_Y]; + int space_status = 0; + long storage_size = 0; + + // Initialize the dataset. + for (int indx = 0; indx < DIM_X; indx++) + for (int jndx = 0; jndx < DIM_Y; jndx++) + dset_data[indx][jndx] = FILLVAL; + + // Create a 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, and set the chunk size. + try { + dcpl_id = H5.H5Pcreate(HDF5Constants.H5P_DATASET_CREATE); + } + 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(); + } + + System.out.println("Creating datasets..."); + System.out.println(DATASETNAME1 + " has allocation time H5D_ALLOC_TIME_LATE"); + System.out.println(DATASETNAME2 + " has allocation time H5D_ALLOC_TIME_EARLY"); + System.out.println(); + + // Create the dataset using the dataset default creation property list. + try { + if ((file_id >= 0) && (filespace_id >= 0)) + dataset_id1 = H5.H5Dcreate(file_id, DATASETNAME1, HDF5Constants.H5T_NATIVE_INT, filespace_id, + HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT, + HDF5Constants.H5P_DEFAULT); + } + catch (Exception e) { + e.printStackTrace(); + } + + // Create the dataset using the dataset creation property list. + try { + if ((file_id >= 0) && (filespace_id >= 0) && (dcpl_id >= 0)) + dataset_id2 = H5.H5Dcreate(file_id, DATASETNAME2, HDF5Constants.H5T_NATIVE_INT, filespace_id, + HDF5Constants.H5P_DEFAULT, dcpl_id, HDF5Constants.H5P_DEFAULT); + } + catch (Exception e) { + e.printStackTrace(); + } + + // Retrieve and print space status and storage size for dset1. + try { + if (dataset_id1 >= 0) + space_status = H5.H5Dget_space_status(dataset_id1); + } + catch (Exception e) { + e.printStackTrace(); + } + try { + if (dataset_id1 >= 0) + storage_size = H5.H5Dget_storage_size(dataset_id1); + } + catch (Exception e) { + e.printStackTrace(); + } + String the_space = " "; + if (H5D_space_status.get(space_status) != H5D_space_status.H5D_SPACE_STATUS_ALLOCATED) + the_space += "not "; + System.out.println("Space for " + DATASETNAME1 + " has" + the_space + "been allocated."); + System.out.println("Storage size for " + DATASETNAME1 + " is: " + storage_size + " bytes."); + + // Retrieve and print space status and storage size for dset2. + try { + if (dataset_id2 >= 0) + space_status = H5.H5Dget_space_status(dataset_id2); + } + catch (Exception e) { + e.printStackTrace(); + } + try { + if (dataset_id2 >= 0) + storage_size = H5.H5Dget_storage_size(dataset_id2); + } + catch (Exception e) { + e.printStackTrace(); + } + the_space = " "; + if (H5D_space_status.get(space_status) != H5D_space_status.H5D_SPACE_STATUS_ALLOCATED) + the_space += "not "; + System.out.println("Space for " + DATASETNAME2 + " has" + the_space + "been allocated."); + System.out.println("Storage size for " + DATASETNAME2 + " is: " + storage_size + " bytes."); + System.out.println(); + + System.out.println("Writing data..."); + System.out.println(); + + // Write the data to the datasets. + try { + if (dataset_id1 >= 0) + H5.H5Dwrite(dataset_id1, HDF5Constants.H5T_NATIVE_INT, HDF5Constants.H5S_ALL, + HDF5Constants.H5S_ALL, HDF5Constants.H5P_DEFAULT, dset_data[0]); + } + catch (Exception e) { + e.printStackTrace(); + } + try { + if (dataset_id2 >= 0) + H5.H5Dwrite(dataset_id2, HDF5Constants.H5T_NATIVE_INT, HDF5Constants.H5S_ALL, + HDF5Constants.H5S_ALL, HDF5Constants.H5P_DEFAULT, dset_data[0]); + } + catch (Exception e) { + e.printStackTrace(); + } + + // Retrieve and print space status and storage size for dset1. + try { + if (dataset_id1 >= 0) + space_status = H5.H5Dget_space_status(dataset_id1); + } + catch (Exception e) { + e.printStackTrace(); + } + try { + if (dataset_id1 >= 0) + storage_size = H5.H5Dget_storage_size(dataset_id1); + } + catch (Exception e) { + e.printStackTrace(); + } + the_space = " "; + if (H5D_space_status.get(space_status) != H5D_space_status.H5D_SPACE_STATUS_ALLOCATED) + the_space += "not "; + System.out.println("Space for " + DATASETNAME1 + " has" + the_space + "been allocated."); + System.out.println("Storage size for " + DATASETNAME1 + " is: " + storage_size + " bytes."); + + // Retrieve and print space status and storage size for dset2. + try { + if (dataset_id2 >= 0) + space_status = H5.H5Dget_space_status(dataset_id2); + } + catch (Exception e) { + e.printStackTrace(); + } + try { + if (dataset_id2 >= 0) + storage_size = H5.H5Dget_storage_size(dataset_id2); + } + catch (Exception e) { + e.printStackTrace(); + } + the_space = " "; + if (H5D_space_status.get(space_status) != H5D_space_status.H5D_SPACE_STATUS_ALLOCATED) + the_space += "not "; + System.out.println("Space for " + DATASETNAME2 + " has" + the_space + "been allocated."); + System.out.println("Storage size for " + DATASETNAME2 + " is: " + storage_size + " bytes."); + 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_id1 >= 0) + H5.H5Dclose(dataset_id1); + } + catch (Exception e) { + e.printStackTrace(); + } + + try { + if (dataset_id2 >= 0) + H5.H5Dclose(dataset_id2); + } + 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_Alloc.allocation(); } +} |