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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://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 iterate over group members using
H5Gget_obj_info_all.
************************************************************/
package examples.groups;
import hdf.hdf5lib.H5;
import hdf.hdf5lib.HDF5Constants;
import hdf.hdf5lib.structs.H5O_token_t;
import java.util.EnumSet;
import java.util.HashMap;
import java.util.Map;
public class H5Ex_G_Iterate {
private static String FILENAME = "groups/h5ex_g_iterate.h5";
private static String DATASETNAME = "/";
enum H5O_type {
H5O_TYPE_UNKNOWN(-1), // Unknown object type
H5O_TYPE_GROUP(0), // Object is a group
H5O_TYPE_DATASET(1), // Object is a dataset
H5O_TYPE_NAMED_DATATYPE(2), // Object is a named data type
H5O_TYPE_NTYPES(3); // Number of different object types
private static final Map<Integer, H5O_type> lookup = new HashMap<Integer, H5O_type>();
static {
for (H5O_type s : EnumSet.allOf(H5O_type.class))
lookup.put(s.getCode(), s);
}
private int code;
H5O_type(int layout_type) {
this.code = layout_type;
}
public int getCode() {
return this.code;
}
public static H5O_type get(int code) {
return lookup.get(code);
}
}
private static void do_iterate() {
long file_id = -1;
// Open a file using default properties.
try {
file_id = H5.H5Fopen(FILENAME, HDF5Constants.H5F_ACC_RDONLY, HDF5Constants.H5P_DEFAULT);
}
catch (Exception e) {
e.printStackTrace();
}
// Begin iteration.
System.out.println("Objects in root group:");
try {
if (file_id >= 0) {
int count = (int) H5.H5Gn_members(file_id, DATASETNAME);
String[] oname = new String[count];
int[] otype = new int[count];
int[] ltype = new int[count];
H5O_token_t[] otokens = new H5O_token_t[count];
H5.H5Gget_obj_info_all(file_id, DATASETNAME, oname, otype, ltype, otokens, HDF5Constants.H5_INDEX_NAME);
// Get type of the object and display its name and type.
for (int indx = 0; indx < otype.length; indx++) {
switch (H5O_type.get(otype[indx])) {
case H5O_TYPE_GROUP:
System.out.println(" Group: " + oname[indx]);
break;
case H5O_TYPE_DATASET:
System.out.println(" Dataset: " + oname[indx]);
break;
case H5O_TYPE_NAMED_DATATYPE:
System.out.println(" Datatype: " + oname[indx]);
break;
default:
System.out.println(" Unknown: " + oname[indx]);
}
}
}
}
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_Iterate.do_iterate();
}
}
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