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H5Ex_T_ObjectReference.java
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H5Ex_T_ObjectReference.java
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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* 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 *
* [email protected]. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/************************************************************
This example shows how to read and write object references
to a dataset. The program first creates objects in the
file and writes references to those objects to a dataset
with a dataspace of DIM0, then closes the file. Next, it
reopens the file, dereferences the references, and outputs
the names of their targets to the screen.
************************************************************/
import java.util.EnumSet;
import java.util.HashMap;
import java.util.Map;
import hdf.hdf5lib.H5;
import hdf.hdf5lib.HDF5Constants;
public class H5Ex_T_ObjectReference {
private static String FILENAME = "H5Ex_T_ObjectReference.h5";
private static String DATASETNAME = "DS1";
private static String DATASETNAME2 = "DS2";
private static String GROUPNAME = "G1";
private static final int DIM0 = 2;
private static final int RANK = 1;
// Values for the status of space allocation
enum H5G_obj {
H5G_UNKNOWN(HDF5Constants.H5O_TYPE_UNKNOWN), /* Unknown object type */
H5G_GROUP(HDF5Constants.H5O_TYPE_GROUP), /* Object is a group */
H5G_DATASET(HDF5Constants.H5O_TYPE_DATASET), /* Object is a dataset */
H5G_TYPE(HDF5Constants.H5O_TYPE_NAMED_DATATYPE); /* Object is a named data type */
private static final Map<Integer, H5G_obj> lookup = new HashMap<Integer, H5G_obj>();
static
{
for (H5G_obj s : EnumSet.allOf(H5G_obj.class))
lookup.put(s.getCode(), s);
}
private int code;
H5G_obj(int layout_type) { this.code = layout_type; }
public int getCode() { return this.code; }
public static H5G_obj get(int code) { return lookup.get(code); }
}
private static void writeObjRef()
{
long file_id = HDF5Constants.H5I_INVALID_HID;
long dataspace_id = HDF5Constants.H5I_INVALID_HID;
long filespace_id = HDF5Constants.H5I_INVALID_HID;
long group_id = HDF5Constants.H5I_INVALID_HID;
long dataset_id = HDF5Constants.H5I_INVALID_HID;
long[] dims = {DIM0};
byte[][] dset_data = new byte[DIM0][HDF5Constants.H5R_REF_BUF_SIZE];
// 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 dataset with a scalar dataspace.
try {
dataspace_id = H5.H5Screate(HDF5Constants.H5S_SCALAR);
if ((file_id >= 0) && (dataspace_id >= 0)) {
dataset_id = H5.H5Dcreate(file_id, DATASETNAME2, HDF5Constants.H5T_STD_I32LE, dataspace_id,
HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT,
HDF5Constants.H5P_DEFAULT);
if (dataset_id >= 0)
H5.H5Dclose(dataset_id);
dataset_id = HDF5Constants.H5I_INVALID_HID;
H5.H5Sclose(dataspace_id);
dataspace_id = HDF5Constants.H5I_INVALID_HID;
}
}
catch (Exception e) {
e.printStackTrace();
}
// Create a group in the file.
try {
if (file_id >= 0)
group_id = H5.H5Gcreate(file_id, GROUPNAME, HDF5Constants.H5P_DEFAULT,
HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT);
if (group_id >= 0)
H5.H5Gclose(group_id);
group_id = HDF5Constants.H5I_INVALID_HID;
}
catch (Exception e) {
e.printStackTrace();
}
try {
if (file_id >= 0) {
try {
dset_data[0] = H5.H5Rcreate_object(file_id, GROUPNAME, HDF5Constants.H5P_DEFAULT);
}
catch (Throwable err) {
err.printStackTrace();
}
try {
dset_data[1] = H5.H5Rcreate_object(file_id, DATASETNAME2, HDF5Constants.H5P_DEFAULT);
}
catch (Throwable err) {
err.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.
try {
if ((file_id >= 0) && (filespace_id >= 0))
dataset_id = H5.H5Dcreate(file_id, DATASETNAME, HDF5Constants.H5T_STD_REF, filespace_id,
HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT,
HDF5Constants.H5P_DEFAULT);
}
catch (Exception e) {
e.printStackTrace();
}
// Write the object references to it.
try {
if (dataset_id >= 0)
H5.H5Dwrite(dataset_id, HDF5Constants.H5T_STD_REF, HDF5Constants.H5S_ALL,
HDF5Constants.H5S_ALL, HDF5Constants.H5P_DEFAULT, dset_data);
}
catch (Exception e) {
e.printStackTrace();
}
}
catch (Exception ex) {
ex.printStackTrace();
}
finally {
try {
H5.H5Rdestroy(dset_data[1]);
}
catch (Exception ex) {
}
try {
H5.H5Rdestroy(dset_data[0]);
}
catch (Exception ex) {
}
}
// 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 (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 readObjRef()
{
long file_id = HDF5Constants.H5I_INVALID_HID;
long dataset_id = HDF5Constants.H5I_INVALID_HID;
long dataspace_id = HDF5Constants.H5I_INVALID_HID;
int object_type = -1;
long object_id = HDF5Constants.H5I_INVALID_HID;
long[] dims = {DIM0};
byte[][] dset_data = new byte[DIM0][HDF5Constants.H5R_REF_BUF_SIZE];
// Open an existing file.
try {
file_id = H5.H5Fopen(FILENAME, HDF5Constants.H5F_ACC_RDONLY, HDF5Constants.H5P_DEFAULT);
// Open an existing dataset.
try {
dataset_id = H5.H5Dopen(file_id, DATASETNAME, HDF5Constants.H5P_DEFAULT);
try {
// Get dataspace and allocate memory for read buffer.
dataspace_id = H5.H5Dget_space(dataset_id);
H5.H5Sget_simple_extent_dims(dataspace_id, dims, null);
// Read data.
H5.H5Dread(dataset_id, HDF5Constants.H5T_STD_REF, HDF5Constants.H5S_ALL,
HDF5Constants.H5S_ALL, HDF5Constants.H5P_DEFAULT, dset_data);
// Output the data to the screen.
for (int indx = 0; indx < dims[0]; indx++) {
System.out.println(DATASETNAME + "[" + indx + "]:");
System.out.print(" ->");
// Open the referenced object, get its name and type.
try {
object_id = H5.H5Ropen_object(dset_data[indx], HDF5Constants.H5P_DEFAULT,
HDF5Constants.H5P_DEFAULT);
try {
object_type = H5.H5Rget_obj_type3(dset_data[indx], HDF5Constants.H5R_OBJECT);
String obj_name = null;
if (object_type >= 0) {
// Get the name.
obj_name = H5.H5Iget_name(object_id);
}
if ((object_id >= 0) && (object_type >= -1)) {
switch (H5G_obj.get(object_type)) {
case H5G_GROUP:
System.out.print("H5G_GROUP");
break;
case H5G_DATASET:
System.out.print("H5G_DATASET");
break;
case H5G_TYPE:
System.out.print("H5G_TYPE");
break;
default:
System.out.print("UNHANDLED");
}
}
// Print the name.
System.out.println(": " + obj_name);
}
catch (Exception e) {
e.printStackTrace();
}
finally {
try {
H5.H5Oclose(object_id);
}
catch (Exception e) {
}
}
}
catch (Exception e4) {
e4.printStackTrace();
}
finally {
try {
H5.H5Rdestroy(dset_data[indx]);
}
catch (Exception e4) {
}
}
} // end for
}
catch (Exception e3) {
e3.printStackTrace();
}
finally {
try {
H5.H5Sclose(dataspace_id);
}
catch (Exception e3) {
}
}
}
catch (Exception e2) {
e2.printStackTrace();
}
finally {
try {
H5.H5Dclose(dataset_id);
}
catch (Exception e2) {
}
}
}
catch (Exception e1) {
e1.printStackTrace();
}
finally {
try {
H5.H5Fclose(file_id);
}
catch (Exception e1) {
}
}
}
public static void main(String[] args)
{
H5Ex_T_ObjectReference.writeObjRef();
H5Ex_T_ObjectReference.readObjRef();
}
}