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Diffstat (limited to 'java/examples/groups/H5Ex_G_Phase.java')
| -rw-r--r-- | java/examples/groups/H5Ex_G_Phase.java | 241 |
1 files changed, 241 insertions, 0 deletions
diff --git a/java/examples/groups/H5Ex_G_Phase.java b/java/examples/groups/H5Ex_G_Phase.java new file mode 100644 index 0000000..f23d6f2 --- /dev/null +++ b/java/examples/groups/H5Ex_G_Phase.java @@ -0,0 +1,241 @@ +/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * + * 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 files COPYING and Copyright.html. COPYING can be found at the root * + * of the source code distribution tree; Copyright.html can be found at the * + * root level of an installed copy of the electronic HDF5 document set and * + * is linked from the top-level documents page. It can also be found at * + * http://hdfgroup.org/HDF5/doc/Copyright.html. If you do not have * + * access to either file, you may request a copy from help@hdfgroup.org. * + * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ + +/************************************************************ + This example shows how to set the conditions for + conversion between compact and dense (indexed) groups. + ************************************************************/ +package examples.groups; + +import hdf.hdf5lib.H5; +import hdf.hdf5lib.HDF5Constants; +import hdf.hdf5lib.structs.H5G_info_t; + +import java.util.EnumSet; +import java.util.HashMap; +import java.util.Map; + +public class H5Ex_G_Phase { + private static String FILE = "H5Ex_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() { + long file_id = -1; + long group_id = -1; + long subgroup_id = -1; + long fapl_id = -1; + long 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 group access property list and set the phase change conditions. + try { + gcpl_id = H5.H5Pcreate(HDF5Constants.H5P_GROUP_CREATE); + if (gcpl_id >= 0) + H5.H5Pset_link_phase_change(gcpl_id, MAX_COMPACT, MIN_DENSE); + } + catch (Exception e) { + e.printStackTrace(); + } + + // Create a new file using the default properties. + try { + if (fapl_id >= 0) + file_id = H5.H5Fcreate(FILE, HDF5Constants.H5F_ACC_TRUNC, HDF5Constants.H5P_DEFAULT, fapl_id); + } + catch (Exception e) { + e.printStackTrace(); + } + + // Create primary group. + try { + if ((file_id >= 0) && (gcpl_id >= 0)) + group_id = H5.H5Gcreate(file_id, name, HDF5Constants.H5P_DEFAULT, gcpl_id, HDF5Constants.H5P_DEFAULT); + } + 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 { + if (group_id >= 0) { + subgroup_id = H5.H5Gcreate(group_id, name, HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT, + HDF5Constants.H5P_DEFAULT); + H5.H5Gclose(subgroup_id); + } + } + 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 + break; + case H5G_STORAGE_TYPE_UNKNOWN: + System.out.println("H5G_STORAGE_TYPE_UNKNOWN"); + break; + default: + System.out.println("Storage Type Invalid"); + break; + } + } + } + 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 { + H5.H5Ldelete(group_id, name, HDF5Constants.H5P_DEFAULT); + } + 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 + break; + case H5G_STORAGE_TYPE_UNKNOWN: + System.out.println("H5G_STORAGE_TYPE_UNKNOWN"); + break; + default: + System.out.println("Storage Type Invalid"); + break; + } + } + } + catch (Exception e) { + e.printStackTrace(); + } + } + + // Close and release resources + try { + if (fapl_id >= 0) + H5.H5Pclose(fapl_id); + } + catch (Exception e) { + e.printStackTrace(); + } + + try { + if (gcpl_id >= 0) + H5.H5Pclose(gcpl_id); + } + catch (Exception e) { + e.printStackTrace(); + } + + // Close the group + try { + if (group_id >= 0) + H5.H5Gclose(group_id); + } + 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_Phase.CreateGroup(); + } + +} |