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Diffstat (limited to 'HDF5Examples/JAVA/H5G/H5Ex_G_Visit.java')
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diff --git a/HDF5Examples/JAVA/H5G/H5Ex_G_Visit.java b/HDF5Examples/JAVA/H5G/H5Ex_G_Visit.java new file mode 100644 index 0000000..7d37c59 --- /dev/null +++ b/HDF5Examples/JAVA/H5G/H5Ex_G_Visit.java @@ -0,0 +1,153 @@ +/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * + * 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 recursively traverse a file + using H5Ovisit and H5Lvisit. The program prints all of + the objects in the file specified in FILE, then prints all + of the links in that file. The default file used by this + example implements the structure described in the User + Guide, chapter 4, figure 26. + ************************************************************/ + +import java.util.ArrayList; + +import hdf.hdf5lib.H5; +import hdf.hdf5lib.HDF5Constants; +import hdf.hdf5lib.callbacks.H5L_iterate_opdata_t; +import hdf.hdf5lib.callbacks.H5L_iterate_t; +import hdf.hdf5lib.callbacks.H5O_iterate_opdata_t; +import hdf.hdf5lib.callbacks.H5O_iterate_t; +import hdf.hdf5lib.structs.H5L_info_t; +import hdf.hdf5lib.structs.H5O_info_t; + +public class H5Ex_G_Visit { + + private static String FILE = "groups/h5ex_g_visit.h5"; + + public static void main(String[] args) + { + try { + (new H5Ex_G_Visit()).VisitGroup(); + } + catch (Exception ex) { + ex.printStackTrace(); + } + } + + private void VisitGroup() throws Exception + { + + long file_id = HDF5Constants.H5I_INVALID_HID; + + try { + // Open file + file_id = H5.H5Fopen(FILE, HDF5Constants.H5F_ACC_RDONLY, HDF5Constants.H5P_DEFAULT); + + // Begin iteration using H5Ovisit + System.out.println("Objects in the file:"); + 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); + System.out.println(); + // Repeat the same process using H5Lvisit + H5L_iterate_opdata_t iter_data2 = new H5L_iter_data(); + H5L_iterate_t iter_cb2 = new H5L_iter_callback(); + System.out.println("Links in the file:"); + H5.H5Lvisit(file_id, HDF5Constants.H5_INDEX_NAME, HDF5Constants.H5_ITER_NATIVE, iter_cb2, + iter_data2); + } + catch (Exception e) { + e.printStackTrace(); + } + finally { + // Close and release resources. + if (file_id >= 0) + H5.H5Fclose(file_id); + } + } + + /************************************************************ + * Operator function for H5Lvisit. This function simply retrieves the info for the object the current link + *points to, and calls the operator function for H5Ovisit. + ************************************************************/ + + 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 H5L_iter_data implements H5L_iterate_opdata_t { + public ArrayList<idata> iterdata = new ArrayList<idata>(); + } + + private class H5L_iter_callback implements H5L_iterate_t { + public int callback(long group, String name, H5L_info_t info, H5L_iterate_opdata_t op_data) + { + + idata id = new idata(name, info.type); + ((H5L_iter_data)op_data).iterdata.add(id); + + H5O_info_t infobuf; + int ret = 0; + try { + // Get type of the object and display its name and type. The name of the object is passed to + // this function by the Library. + infobuf = H5.H5Oget_info_by_name(group, name, HDF5Constants.H5P_DEFAULT); + H5O_iterate_t iter_cbO = new H5O_iter_callback(); + H5O_iterate_opdata_t iter_dataO = new H5O_iter_data(); + ret = iter_cbO.callback(group, name, infobuf, iter_dataO); + } + catch (Exception e) { + e.printStackTrace(); + } + + return ret; + } + } + + 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; + } + } +} |