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/************************************************************
This example shows how to set the conditions for
conversion between compact and dense (indexed) groups.
This file is intended for use with HDF5 Library version 1.8
************************************************************/
package examples.groups;
import java.util.EnumSet;
import java.util.HashMap;
import java.util.Map;
import ncsa.hdf.hdf5lib.H5;
import ncsa.hdf.hdf5lib.HDF5Constants;
import ncsa.hdf.hdf5lib.exceptions.HDF5Exception;
import ncsa.hdf.hdf5lib.structs.H5G_info_t;
import ncsa.hdf.object.FileFormat;
import ncsa.hdf.object.Group;
import ncsa.hdf.object.h5.H5File;
import ncsa.hdf.object.h5.H5Group;
public class H5ObjectEx_G_Phase {
private static String FILE = "H5ObjectEx_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() {
H5File file = null;
H5Group grp = null;
int group_id = -1;
int fapl_id = -1;
int gcpl_id = -1;
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 a new file using the default properties.
try {
if(fapl_id >= 0) {
file = new H5File(FILE, FileFormat.CREATE);
file.open(fapl_id);
}
}
catch (Exception e) {
e.printStackTrace();
}
//Create primary group.
try {
//Create group creation property list and set the phase change conditions.
gcpl_id = file.createGcpl(0, MAX_COMPACT, MIN_DENSE);
if(gcpl_id >= 0) {
grp = (H5Group) file.createGroup(name, null, HDF5Constants.H5P_DEFAULT, gcpl_id);
gcpl_id = -1; //Create closes the group creation property list
group_id = grp.open();
}
}
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 {
file.createGroup(name, grp);
}
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
}
}
}
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 {
Group subgrp = (Group) file.get("/G0/" + name);
if(subgrp == null)
throw new HDF5Exception(
"The subgroup - "+name+" - object could not be found.");
file.delete(subgrp);
}
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
}
}
}
catch(Exception e) {
e.printStackTrace();
}
}
//Close and release resources
try {
if(fapl_id >= 0)
H5.H5Pclose (fapl_id);
}
catch(Exception e) {
e.printStackTrace();
}
//Close the group
try {
if(group_id >= 0)
grp.close (group_id);
}
catch(Exception e) {
e.printStackTrace();
}
//Close the file
try {
file.close();
}
catch(Exception e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
H5ObjectEx_G_Phase.CreateGroup();
}
}
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