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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Copyright by The HDF Group. *
* All rights reserved. *
* *
* This file is part of HDF Products. The full HDF copyright *
* notice, including terms governing use, modification, and redistribution, *
* is contained in the file, COPYING. COPYING can be found at the root of *
* the source code distribution tree. You can also access it online at *
* https://www.hdfgroup.org/licenses. If you do not have access to the *
* file, you may request a copy from help@hdfgroup.org. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
import hdf.hdflib.HDFConstants;
import hdf.hdflib.HDFLibrary;
/**
* <p>
* Title: HDF Native Package (Java) Example
* </p>
* <p>
* Description: this example shows how to create a HDF4 vdata file using the
* "HDF Native Package (Java)".
* </p>
*/
public class VDWriteToVdata {
private static String fname = "General_Vdatas.hdf";
private static String CLASS_NAME = "Particle Data";
private static String VDATA_NAME = "Solid Particle";
private static String FIELD1_NAME = "Position"; /* contains x, y, z values */
private static String FIELD2_NAME = "Mass"; /* contains weight values */
private static String FIELD3_NAME = "Temperature"; /* contains min and max values */
private static String FIELDNAME_LIST = "Position,Mass,Temperature"; /* No spaces b/w names */
private static int N_RECORDS = 10; /* number of records the vdata contains */
private static int ORDER_1 = 3; /* order of first field */
private static int ORDER_2 = 1; /* order of second field */
private static int ORDER_3 = 2; /* order of third field */
private static int N_VALS_PER_REC = 6; /* number of values per record (ORDER_1 + ORDER_2 + ORDER_3) */
public static void main(String args[]) throws Exception
{
long file_id = -1;
long vdata_id = -1;
float data_buf[][] = new float[N_RECORDS][N_VALS_PER_REC]; /* buffer for vdata values */
// Create a new file using default properties.
try {
file_id = HDFLibrary.Hopen(fname, HDFConstants.DFACC_CREATE);
// Initialize the V interface.
if (file_id >= 0)
HDFLibrary.Vstart(file_id);
}
catch (Exception e) {
e.printStackTrace();
System.err.println("Failed to create file:" + fname);
return;
}
System.out.println("File created:" + fname);
try {
// Create the vgroup. Note that the vgroup reference number is set
// to -1 for creating and the access mode is "w" for writing.
if (file_id >= 0) {
vdata_id = HDFLibrary.VSattach(file_id, -1, "w");
if (vdata_id >= 0) {
HDFLibrary.VSsetname(vdata_id, VDATA_NAME);
HDFLibrary.VSsetclass(vdata_id, CLASS_NAME);
}
}
}
catch (Exception e) {
e.printStackTrace();
}
try {
/*
* Introduce each field's name, data type, and order. This is the first
* part in defining a field.
*/
HDFLibrary.VSfdefine(vdata_id, FIELD1_NAME, HDFConstants.DFNT_FLOAT32, ORDER_1);
HDFLibrary.VSfdefine(vdata_id, FIELD2_NAME, HDFConstants.DFNT_FLOAT32, ORDER_2);
HDFLibrary.VSfdefine(vdata_id, FIELD3_NAME, HDFConstants.DFNT_FLOAT32, ORDER_3);
}
catch (Exception e) {
e.printStackTrace();
}
try {
/*
* Finalize the definition of the fields.
*/
HDFLibrary.VSsetfields(vdata_id, FIELDNAME_LIST);
}
catch (Exception e) {
e.printStackTrace();
}
/*
* Buffer the data by the record for fully interlaced mode. Note that the
* first three elements contain the three values of the first field, the
* fourth element contains the value of the second field, and the last two
* elements contain the two values of the third field.
*/
for (int rec_num = 0; rec_num < N_RECORDS; rec_num++) {
data_buf[rec_num][0] = (float)(1.0 * rec_num);
data_buf[rec_num][1] = (float)(2.0 * rec_num);
data_buf[rec_num][2] = (float)(3.0 * rec_num);
data_buf[rec_num][3] = (float)(0.1 + rec_num);
data_buf[rec_num][4] = (float)0.0;
data_buf[rec_num][5] = (float)65.0;
}
try {
/*
* Write the data from data_buf to the vdata with full interlacing mode.
*/
HDFLibrary.VSwrite(vdata_id, data_buf, N_RECORDS, HDFConstants.FULL_INTERLACE);
}
catch (Exception e) {
e.printStackTrace();
}
// Close the groups.
try {
if (vdata_id >= 0)
HDFLibrary.VSdetach(vdata_id);
}
catch (Exception e) {
e.printStackTrace();
}
// Close the file.
try {
if (file_id >= 0) {
HDFLibrary.Vend(file_id);
HDFLibrary.Hclose(file_id);
}
}
catch (Exception e) {
e.printStackTrace();
}
}
}
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