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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Copyright by The HDF Group. *
* Copyright by the Board of Trustees of the University of Illinois. *
* 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://support.hdfgroup.org/ftp/HDF5/releases. *
* If you do not have access to either file, you may request a copy from *
* help@hdfgroup.org. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/************************************************************
Creating a file with creation properties and traverse the
groups in alpabetical and creation order.
************************************************************/
package examples.groups;
import hdf.hdf5lib.H5;
import hdf.hdf5lib.HDF5Constants;
import hdf.hdf5lib.structs.H5G_info_t;
public class H5Ex_G_Corder {
private static String FILE = "H5Ex_G_Corder.h5";
private static void CreateGroup() throws Exception {
long file_id = -1;
long group_id = -1;
long subgroup_id = -1;
long gcpl_id = -1;
int status;
H5G_info_t ginfo;
int i;
String name;
try {
// Create a new file using default properties.
file_id = H5.H5Fcreate(FILE, HDF5Constants.H5F_ACC_TRUNC, HDF5Constants.H5P_DEFAULT,
HDF5Constants.H5P_DEFAULT);
// Create group creation property list and enable link creation order tracking.
gcpl_id = H5.H5Pcreate(HDF5Constants.H5P_GROUP_CREATE);
status = H5.H5Pset_link_creation_order(gcpl_id, HDF5Constants.H5P_CRT_ORDER_TRACKED
+ HDF5Constants.H5P_CRT_ORDER_INDEXED);
// Create primary group using the property list.
if (status >= 0)
group_id = H5.H5Gcreate(file_id, "index_group", HDF5Constants.H5P_DEFAULT, gcpl_id,
HDF5Constants.H5P_DEFAULT);
try {
/*
* Create subgroups in the primary group. These will be tracked by creation order. Note that these
* groups do not have to have the creation order tracking property set.
*/
subgroup_id = H5.H5Gcreate(group_id, "H", HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT,
HDF5Constants.H5P_DEFAULT);
status = H5.H5Gclose(subgroup_id);
subgroup_id = H5.H5Gcreate(group_id, "D", HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT,
HDF5Constants.H5P_DEFAULT);
status = H5.H5Gclose(subgroup_id);
subgroup_id = H5.H5Gcreate(group_id, "F", HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT,
HDF5Constants.H5P_DEFAULT);
status = H5.H5Gclose(subgroup_id);
subgroup_id = H5.H5Gcreate(group_id, "5", HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT,
HDF5Constants.H5P_DEFAULT);
status = H5.H5Gclose(subgroup_id);
// Get group info.
ginfo = H5.H5Gget_info(group_id);
// Traverse links in the primary group using alphabetical indices (H5_INDEX_NAME).
System.out.println("Traversing group using alphabetical indices:");
for (i = 0; i < ginfo.nlinks; i++) {
// Retrieve the name of the ith link in a group
name = H5.H5Lget_name_by_idx(group_id, ".", HDF5Constants.H5_INDEX_NAME, HDF5Constants.H5_ITER_INC,
i, HDF5Constants.H5P_DEFAULT);
System.out.println("Index " + i + ": " + name);
}
// Traverse links in the primary group by creation order (H5_INDEX_CRT_ORDER).
System.out.println("Traversing group using creation order indices:");
for (i = 0; i < ginfo.nlinks; i++) {
// Retrieve the name of the ith link in a group
name = H5.H5Lget_name_by_idx(group_id, ".", HDF5Constants.H5_INDEX_CRT_ORDER,
HDF5Constants.H5_ITER_INC, i, HDF5Constants.H5P_DEFAULT);
System.out.println("Index " + i + ": " + name);
}
}
catch (Exception e) {
e.printStackTrace();
}
}
catch (Exception e) {
e.printStackTrace();
}
finally {
// Close and release resources.
if (gcpl_id >= 0)
H5.H5Pclose(gcpl_id);
if (group_id >= 0)
H5.H5Gclose(group_id);
if (file_id >= 0)
H5.H5Fclose(file_id);
}
}
public static void main(String[] args) {
try {
H5Ex_G_Corder.CreateGroup();
}
catch (Exception ex) {
ex.printStackTrace();
}
}
}
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