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+/******************************************************************
+ * CreateAttribute.java (for HDF5 tutorial lesson 7)
+ *
+ * -- Creating and Writing a dataset attribute
+ * (a java conversion from h5_crtatt.c)
+ *
+ ******************************************************************/
+
+import ncsa.hdf.hdf5lib.*;
+import ncsa.hdf.hdf5lib.exceptions.*;
+
+public class CreateAttribute
+{
+ public static void main(String []argv)
+ {
+ final String FILE = "dset.h5";
+ int file_id = -1; // file identifier
+ int dataset_id = -1; // dataset identifier
+ int attribute_id = -1;
+ int dataspace_id = -1; // dataspace identifier
+ long[] dims = new long[1];
+ int[] attr_data = new int[2];
+ int status = -1;
+
+ // Initialize the attribute data.
+ attr_data[0] = 100;
+ attr_data[1] = 200;
+
+ // 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");
+
+ // Create the data space for the attribute.
+ dims[0] = 2;
+ dataspace_id = H5Screate_simple_wrap (1, dims, null);
+
+ // Create a dataset attribute.
+ attribute_id = H5Acreate_wrap
+ (dataset_id, "attr",
+ H5.J2C (HDF5CDataTypes.JH5T_STD_I32BE),
+ dataspace_id, HDF5Constants.H5P_DEFAULT);
+
+ // Write the attribute data.
+ status = H5Awrite_wrap
+ (attribute_id,
+ H5.J2C (HDF5CDataTypes.JH5T_NATIVE_INT),
+ attr_data);
+
+ // Close the attribute.
+ status = H5Aclose_wrap (attribute_id);
+
+ // Close the dataspace.
+ status = H5Sclose_wrap (dataspace_id);
+
+ // Close to 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
+ ("CreateAttribute.H5Fopen_wrap() with HDF5Exception: "
+ + hdf5e.getMessage());
+ }
+ catch (Exception e)
+ {
+ System.out.println
+ ("CreateAttribute.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
+ ("CreateAttribute.H5Dopen_wrap() with HDF5Exception: "
+ + hdf5e.getMessage());
+ }
+ catch (Exception e)
+ {
+ System.out.println
+ ("CreateAttribute.H5Dopen_wrap() with other Exception: "
+ + e.getMessage());
+ }
+ return dataset_id;
+ }
+
+
+ // Create the data space for the attribute.
+ public static int H5Screate_simple_wrap (int rank, long dims[],
+ long maxdims[])
+ {
+ int dataspace_id = -1; // dataspace identifier
+
+ try
+ {
+ // Create the data space for the dataset.
+ dataspace_id = H5.H5Screate_simple (rank, dims, maxdims);
+ }
+ catch (HDF5Exception hdf5e)
+ {
+ System.out.println
+ ("CreateAttribute.H5Screate_simple_wrap() with HDF5Exception: "
+ + hdf5e.getMessage());
+
+ }
+ catch (Exception e)
+ {
+ System.out.println
+ ("CreateAttribute.H5Screate_simple_wrap() with other Exception: "
+ + e.getMessage());
+ }
+ return dataspace_id;
+ }
+
+
+ // Help function for creating a dataset attribute.
+ public static int H5Acreate_wrap (int loc_id, String name, int type_id,
+ int space_id, int create_plist)
+ {
+ int attribute_id = -1; // attribute identifier
+
+ try
+ {
+ // Create the dataset
+ attribute_id = H5.H5Acreate (loc_id, name, type_id, space_id,
+ create_plist);
+ }
+ catch (HDF5Exception hdf5e)
+ {
+ System.out.println
+ ("CreateAttribute.H5Acreate_wrap() with HDF5Exception: "
+ + hdf5e.getMessage());
+ }
+ catch (Exception e)
+ {
+ System.out.println
+ ("CreateAttribute.H5Acreate_wrap() with other Exception: "
+ + e.getMessage());
+ }
+ return attribute_id;
+ }
+
+
+ // Help function for writing the attribute data.
+ public static int H5Awrite_wrap (int attr_id, int mem_type_id,
+ Object buf)
+ {
+ int status = -1;
+
+ try
+ {
+ // Write the attribute data.
+ status = H5.H5Awrite (attr_id, mem_type_id, buf);
+ }
+ catch (HDF5Exception hdf5e)
+ {
+ System.out.println
+ ("CreateAttribute.H5Awrite_wrap() with HDF5Exception: "
+ + hdf5e.getMessage());
+ }
+ catch (Exception e)
+ {
+ System.out.println
+ ("CreateAttribute.H5Awrite_wrap() with other exception: "
+ + e.getMessage());
+ }
+ return status;
+ }
+
+
+ // Help function for closing the attribute
+ public static int H5Aclose_wrap (int attribute_id)
+ {
+ int status = -1;
+
+ try
+ {
+ // Close the dataset
+ status = H5.H5Aclose (attribute_id);
+ }
+ catch (HDF5Exception hdf5e)
+ {
+ System.out.println
+ ("CreateAttribute.H5Aclose_wrap() with HDF5Exception: "
+ + hdf5e.getMessage());
+ }
+ catch (Exception e)
+ {
+ System.out.println
+ ("CreateAttribute.H5Aclose_wrap() with other exception: "
+ + e.getMessage());
+ }
+ return status;
+ }
+
+
+ // Help function for closing the dataset
+ public static int H5Dclose_wrap (int dataset_id)
+ {
+ int status = -1;
+
+ try
+ {
+ // Close the dataset
+ status = H5.H5Dclose (dataset_id);
+ }
+ catch (HDF5Exception hdf5e)
+ {
+ System.out.println
+ ("CreateAttribute.H5Dclose_wrap() with HDF5Exception: "
+ + hdf5e.getMessage());
+ }
+ catch (Exception e)
+ {
+ System.out.println
+ ("CreateAttribute.H5Dclose_wrap() with other exception: "
+ + e.getMessage());
+ }
+ return status;
+ }
+
+
+ // Help function for closing the dataspace
+ public static int H5Sclose_wrap (int dataspace_id)
+ {
+ int status = -1;
+
+ try
+ {
+ // Terminate access to the data space.
+ status = H5.H5Sclose (dataspace_id);
+ }
+ catch (HDF5Exception hdf5e)
+ {
+ System.out.println
+ ("CreateAttribute.H5Sclose_wrap() with HDF5Exception: "
+ + hdf5e.getMessage());
+ }
+ catch (Exception e)
+ {
+ System.out.println
+ ("CreateAttribute.H5Sclose_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
+ ("CreateAttribute.H5Fclose_wrap() with HDF5Exception: "
+ + hdf5e.getMessage());
+ }
+ catch (Exception e)
+ {
+ System.out.println
+ ("CreateAttribute.H5Fclose_wrap() with other exception: "
+ + e.getMessage());
+ }
+ return status;
+ }
+}