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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 *
* help@hdfgroup.org. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/************************************************************
This example shows how to set the conditions for
conversion between compact and dense (indexed) groups.
************************************************************/
package examples.groups;
import hdf.hdf5lib.H5;
import hdf.hdf5lib.HDF5Constants;
import hdf.hdf5lib.structs.H5G_info_t;
import java.util.EnumSet;
import java.util.HashMap;
import java.util.Map;
public class H5Ex_G_Phase {
private static String FILE = "H5Ex_G_Phase.h5";
private static int MAX_GROUPS = 7;
private static int MAX_COMPACT = 5;
private static int MIN_DENSE = 3;
enum H5G_storage {
H5G_STORAGE_TYPE_UNKNOWN(-1),
H5G_STORAGE_TYPE_SYMBOL_TABLE(0),
H5G_STORAGE_TYPE_COMPACT(1),
H5G_STORAGE_TYPE_DENSE(2);
private static final Map<Integer, H5G_storage> lookup = new HashMap<Integer, H5G_storage>();
static {
for (H5G_storage s : EnumSet.allOf(H5G_storage.class))
lookup.put(s.getCode(), s);
}
private int code;
H5G_storage(int layout_type) {
this.code = layout_type;
}
public int getCode() {
return this.code;
}
public static H5G_storage get(int code) {
return lookup.get(code);
}
}
private static void CreateGroup() {
long file_id = HDF5Constants.H5I_INVALID_HID;
long group_id = HDF5Constants.H5I_INVALID_HID;
long subgroup_id = HDF5Constants.H5I_INVALID_HID;
long fapl_id = HDF5Constants.H5I_INVALID_HID;
long gcpl_id = HDF5Constants.H5I_INVALID_HID;
H5G_info_t ginfo;
String name = "G0"; // Name of subgroup_id
int i;
// Set file access property list to allow the latest file format.This will allow the library to create new
// format groups.
try {
fapl_id = H5.H5Pcreate(HDF5Constants.H5P_FILE_ACCESS);
if (fapl_id >= 0)
H5.H5Pset_libver_bounds(fapl_id, HDF5Constants.H5F_LIBVER_LATEST, HDF5Constants.H5F_LIBVER_LATEST);
}
catch (Exception e) {
e.printStackTrace();
}
// Create group access property list and set the phase change conditions.
try {
gcpl_id = H5.H5Pcreate(HDF5Constants.H5P_GROUP_CREATE);
if (gcpl_id >= 0)
H5.H5Pset_link_phase_change(gcpl_id, MAX_COMPACT, MIN_DENSE);
}
catch (Exception e) {
e.printStackTrace();
}
// Create a new file using the default properties.
try {
if (fapl_id >= 0)
file_id = H5.H5Fcreate(FILE, HDF5Constants.H5F_ACC_TRUNC, HDF5Constants.H5P_DEFAULT, fapl_id);
}
catch (Exception e) {
e.printStackTrace();
}
// Create primary group.
try {
if ((file_id >= 0) && (gcpl_id >= 0))
group_id = H5.H5Gcreate(file_id, name, HDF5Constants.H5P_DEFAULT, gcpl_id, HDF5Constants.H5P_DEFAULT);
}
catch (Exception e) {
e.printStackTrace();
}
// Add subgroups to "group" one at a time, print the storage type for "group" after each subgroup is created.
for (i = 1; i <= MAX_GROUPS; i++) {
// Define the subgroup name and create the subgroup.
char append = (char) (((char) i) + '0');
name = name + append; /* G1, G2, G3 etc. */
try {
if (group_id >= 0) {
subgroup_id = H5.H5Gcreate(group_id, name, HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT,
HDF5Constants.H5P_DEFAULT);
H5.H5Gclose(subgroup_id);
}
}
catch (Exception e) {
e.printStackTrace();
}
// Obtain the group info and print the group storage type
try {
if (group_id >= 0) {
ginfo = H5.H5Gget_info(group_id);
System.out.print(ginfo.nlinks + " Group" + (ginfo.nlinks == 1 ? " " : "s") + ": Storage type is ");
switch (H5G_storage.get(ginfo.storage_type)) {
case H5G_STORAGE_TYPE_COMPACT:
System.out.println("H5G_STORAGE_TYPE_COMPACT"); // New compact format
break;
case H5G_STORAGE_TYPE_DENSE:
System.out.println("H5G_STORAGE_TYPE_DENSE"); // New dense (indexed) format
break;
case H5G_STORAGE_TYPE_SYMBOL_TABLE:
System.out.println("H5G_STORAGE_TYPE_SYMBOL_TABLE"); // Original format
break;
case H5G_STORAGE_TYPE_UNKNOWN:
System.out.println("H5G_STORAGE_TYPE_UNKNOWN");
break;
default:
System.out.println("Storage Type Invalid");
break;
}
}
}
catch (Exception e) {
e.printStackTrace();
}
}
System.out.println();
// Delete subgroups one at a time, print the storage type for "group" after each subgroup is deleted.
for (i = MAX_GROUPS; i >= 1; i--) {
// Define the subgroup name and delete the subgroup.
try {
H5.H5Ldelete(group_id, name, HDF5Constants.H5P_DEFAULT);
}
catch (Exception e) {
e.printStackTrace();
}
name = name.substring(0, i + 1);
// Obtain the group info and print the group storage type
try {
if (group_id >= 0) {
ginfo = H5.H5Gget_info(group_id);
System.out.print(ginfo.nlinks + " Group" + (ginfo.nlinks == 1 ? " " : "s") + ": Storage type is ");
switch (H5G_storage.get(ginfo.storage_type)) {
case H5G_STORAGE_TYPE_COMPACT:
System.out.println("H5G_STORAGE_TYPE_COMPACT"); // New compact format
break;
case H5G_STORAGE_TYPE_DENSE:
System.out.println("H5G_STORAGE_TYPE_DENSE"); // New dense (indexed) format
break;
case H5G_STORAGE_TYPE_SYMBOL_TABLE:
System.out.println("H5G_STORAGE_TYPE_SYMBOL_TABLE"); // Original format
break;
case H5G_STORAGE_TYPE_UNKNOWN:
System.out.println("H5G_STORAGE_TYPE_UNKNOWN");
break;
default:
System.out.println("Storage Type Invalid");
break;
}
}
}
catch (Exception e) {
e.printStackTrace();
}
}
// Close and release resources
try {
if (fapl_id >= 0)
H5.H5Pclose(fapl_id);
}
catch (Exception e) {
e.printStackTrace();
}
try {
if (gcpl_id >= 0)
H5.H5Pclose(gcpl_id);
}
catch (Exception e) {
e.printStackTrace();
}
// Close the group
try {
if (group_id >= 0)
H5.H5Gclose(group_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_G_Phase.CreateGroup();
}
}
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