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/******************************************************************
* DatasetRdWt.java (for HDF5 tutorial lesson 6)
*
* -- Reading and Writing an existing Dataset
* (a java conversion from h5_rdwt.c)
*
******************************************************************/
import ncsa.hdf.hdf5lib.*;
import ncsa.hdf.hdf5lib.exceptions.*;
public class DatasetRdWt
{
public static void main(String []argv)
{
final String FILE = "dset.h5";
int file_id = -1; // file identifier
int dataset_id = -1; // dataset identifier
int status = -1;
int[][] dset_data = new int[4][6];
// Initialize the dataset.
for (int i = 0; i < 4; i++)
for (int j = 0; j < 6; j++)
dset_data[i][j] = i * 6 + j + 1;
// Open an existing file
file_id = H5Fopen_wrap (FILE, HDF5Constants.H5F_ACC_RDWR,
HDF5Constants.H5P_DEFAULT);
// Open an existing dataset.
dataset_id = H5Dopen_wrap (file_id, "/dset");
// Write the dataset.
status = H5Dwrite_wrap
(dataset_id, H5.J2C (HDF5CDataTypes.JH5T_NATIVE_INT),
HDF5Constants.H5S_ALL, HDF5Constants.H5S_ALL,
HDF5Constants.H5P_DEFAULT, dset_data);
status = H5Dread_wrap
(dataset_id, H5.J2C (HDF5CDataTypes.JH5T_NATIVE_INT),
HDF5Constants.H5S_ALL, HDF5Constants.H5S_ALL,
HDF5Constants.H5P_DEFAULT, dset_data);
// Close the dataset.
status = H5Dclose_wrap (dataset_id);
// Close the file.
status = H5Fclose_wrap (file_id);
}
// Help function for opening an existing file
public static int H5Fopen_wrap (String name, int flags, int access_id)
{
int file_id = -1; // file identifier
try
{
// Create a new file using default file properties.
file_id = H5.H5Fopen (name, flags, access_id);
}
catch (HDF5Exception hdf5e)
{
System.out.println
("DatasetRdWt.H5Fopen_wrap() with HDF5Exception: "
+ hdf5e.getMessage());
}
catch (Exception e)
{
System.out.println
("DatasetRdWt.H5Fopen_wrap() with other Exception: "
+ e.getMessage());
}
return file_id;
}
// Help function for opening an existing dataset
public static int H5Dopen_wrap (int loc_id, String name)
{
int dataset_id = -1; // dataset identifier
try
{
// Opening an existing dataset
dataset_id = H5.H5Dopen (loc_id, name);
}
catch (HDF5Exception hdf5e)
{
System.out.println
("DatasetRdWt.H5Dopen_wrap() with HDF5Exception: "
+ hdf5e.getMessage());
}
catch (Exception e)
{
System.out.println
("DatasetRdWt.H5Dopen_wrap() with other Exception: "
+ e.getMessage());
}
return dataset_id;
}
// Help function for writing the dataset
public static int H5Dwrite_wrap (int dataset_id, int mem_type_id,
int mem_space_id, int file_space_id,
int xfer_plist_id, Object buf)
{
int status = -1;
try
{
// Write the dataset.
status = H5.H5Dwrite (dataset_id, mem_type_id, mem_space_id,
file_space_id, xfer_plist_id, buf);
}
catch (HDF5Exception hdf5e)
{
System.out.println
("DatasetRdWt.H5Dwrite_wrap() with HDF5Exception: "
+ hdf5e.getMessage());
}
catch (Exception e)
{
System.out.println
("DatasetRdWt.H5Dwrite_wrap() with other exception: "
+ e.getMessage());
}
return status;
}
// Help function for reading the dataset
public static int H5Dread_wrap (int dataset_id, int mem_type_id,
int mem_space_id, int file_space_id,
int xfer_plist_id, Object obj)
{
int status = -1;
try
{
// Read the dataset.
status = H5.H5Dread (dataset_id, mem_type_id, mem_space_id,
file_space_id, xfer_plist_id, obj);
}
catch (HDF5Exception hdf5e)
{
System.out.println
("DatasetRdWt.H5Dread_wrap() with HDF5Exception: "
+ hdf5e.getMessage());
}
catch (Exception e)
{
System.out.println
("DatasetRdWt.H5Dread_wrap() with other exception: "
+ e.getMessage());
}
return status;
}
// Help function for ending access to the dataset and releasing
// resources used by it.
public static int H5Dclose_wrap (int dataset_id)
{
int status = -1;
try
{
// End access to the dataset and release resources used by it.
status = H5.H5Dclose (dataset_id);
}
catch (HDF5Exception hdf5e)
{
System.out.println
("DatasetRdWt.H5Dclose_wrap() with HDF5Exception: "
+ hdf5e.getMessage());
}
catch (Exception e)
{
System.out.println
("DatasetRdWt.H5Dclose_wrap() with other exception: "
+ e.getMessage());
}
return status;
}
// Help function for terminating access to the file.
public static int H5Fclose_wrap (int file_id)
{
int status = -1;
try
{
// Terminate access to the file.
status = H5.H5Fclose (file_id);
}
catch (HDF5Exception hdf5e)
{
System.out.println
("DatasetRdWt.H5Fclose_wrap() with HDF5Exception: "
+ hdf5e.getMessage());
}
catch (Exception e)
{
System.out.println
("DatasetRdWt.H5Fclose_wrap() with other exception: "
+ e.getMessage());
}
return status;
}
}
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