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+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * 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 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.
+ ************************************************************/
+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_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 = -1;
+ long filespace_id = -1;
+ long dataset_id1 = -1;
+ long dataset_id2 = -1;
+ long dcpl_id = -1;
+ 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();
+ }
+
+}
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