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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. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/************************************************************
This example shows how to create intermediate groups with
a single call to H5Gcreate.
************************************************************/
package examples.groups;
import hdf.hdf5lib.H5;
import hdf.hdf5lib.HDF5Constants;
import hdf.hdf5lib.callbacks.H5O_iterate_t;
import hdf.hdf5lib.callbacks.H5O_iterate_opdata_t;
import hdf.hdf5lib.structs.H5O_info_t;
import java.util.ArrayList;
public class H5Ex_G_Intermediate {
private static String FILE = "H5Ex_G_Intermediate.h5";
private void CreateGroup() throws Exception {
long file_id = -1;
long group_id = -1;
long gcpl_id = -1;
try {
// Create a new file_id using the default properties.
file_id = H5.H5Fcreate(FILE, HDF5Constants.H5F_ACC_TRUNC, HDF5Constants.H5P_DEFAULT,
HDF5Constants.H5P_DEFAULT);
// Create group_id creation property list and set it to allow creation of intermediate group_ids.
gcpl_id = H5.H5Pcreate(HDF5Constants.H5P_LINK_CREATE);
H5.H5Pset_create_intermediate_group(gcpl_id, true);
/*
* Create the group_id /G1/G2/G3. Note that /G1 and /G1/G2 do not exist yet. This call would cause an error
* if we did not use the previously created property list.
*/
group_id = H5
.H5Gcreate(file_id, "/G1/G2/G3", gcpl_id, HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT);
// Print all the objects in the file_ids to show that intermediate group_ids have been created.
System.out.println("Objects in the file_id:");
// H5O_iterate_opdata_t iter_data = null;
H5O_iterate_opdata_t iter_data = new H5O_iter_data();
H5O_iterate_t iter_cb = new H5O_iter_callback();
H5.H5Ovisit(file_id, HDF5Constants.H5_INDEX_NAME, HDF5Constants.H5_ITER_NATIVE, iter_cb, iter_data);
}
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 {
(new H5Ex_G_Intermediate()).CreateGroup();
}
catch (Exception ex) {
ex.printStackTrace();
}
}
private class idata {
public String link_name = null;
public int link_type = -1;
idata(String name, int type) {
this.link_name = name;
this.link_type = type;
}
}
private class H5O_iter_data implements H5O_iterate_opdata_t {
public ArrayList<idata> iterdata = new ArrayList<idata>();
}
private class H5O_iter_callback implements H5O_iterate_t {
public int callback(long group, String name, H5O_info_t info, H5O_iterate_opdata_t op_data) {
idata id = new idata(name, info.type);
((H5O_iter_data) op_data).iterdata.add(id);
System.out.print("/"); /* Print root group in object path */
// Check if the current object is the root group, and if not print the full path name and type.
if (name.charAt(0) == '.') /* Root group, do not print '.' */
System.out.println(" (Group)");
else if (info.type == HDF5Constants.H5O_TYPE_GROUP)
System.out.println(name + " (Group)");
else if (info.type == HDF5Constants.H5O_TYPE_DATASET)
System.out.println(name + " (Dataset)");
else if (info.type == HDF5Constants.H5O_TYPE_NAMED_DATATYPE)
System.out.println(name + " (Datatype)");
else
System.out.println(name + " (Unknown)");
return 0;
}
}
}
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