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!************************************************************
!
! This example shows how to track links in a group by
! creation order. The program creates a series of groups,
! then reads back their names: first in alphabetical order,
! then in creation order.
!
! This file is intended for use with HDF5 Library version 1.8
!
!************************************************************
PROGRAM main
USE HDF5
IMPLICIT NONE
CHARACTER(LEN=16), PARAMETER :: filename = "h5ex_g_corder.h5"
INTEGER(HID_T) :: file, group, subgroup, gcpl ! handles
INTEGER :: hdferr
INTEGER :: storage_type ! Type of storage for links in group:
! H5G_STORAGE_TYPE_COMPACT: Compact storage
! H5G_STORAGE_TYPE_DENSE: Indexed storage
! H5G_STORAGE_TYPE_SYMBOL_TABLE: Symbol tables
INTEGER :: nlinks ! Number of links in group
INTEGER :: max_corder ! Current maximum creation order value for group
INTEGER(SIZE_T) :: size ! Size of name
INTEGER(HSIZE_T) :: i ! Index
CHARACTER(LEN=80) :: name ! Output buffer
!
! Initialize FORTRAN interface.
!
CALL h5open_f(hdferr)
!
! Create a new file using the default properties.
!
CALL h5fcreate_f(filename, H5F_ACC_TRUNC_F, file, hdferr)
!
! Create group creation property list and enable link creation
! order tracking. Attempting to track by creation order in a
! group that does not have this property set will result in an
! error.
!
CALL h5pcreate_f(H5P_GROUP_CREATE_F, gcpl, hdferr)
CALL h5pset_link_creation_order_f( gcpl, IOR(H5P_CRT_ORDER_TRACKED_F,H5P_CRT_ORDER_INDEXED_F),hdferr)
!
! Create primary group using the property list.
!
CALL h5gcreate_f(file, "index_group", group, hdferr, gcpl_id=gcpl)
!
! 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.
!
CALL h5gcreate_f(group, "H", subgroup, hdferr)
CALL h5gclose_f(subgroup,hdferr)
CALL h5gcreate_f(group, "D", subgroup, hdferr)
CALL h5gclose_f(subgroup,hdferr)
CALL h5gcreate_f(group, "F", subgroup, hdferr)
CALL h5gclose_f(subgroup,hdferr)
CALL h5gcreate_f(group, "5", subgroup, hdferr)
CALL h5gclose_f(subgroup,hdferr)
!
! Get group info.
!
CALL H5Gget_info_f(group, storage_type, nlinks, max_corder, hdferr)
!
! Traverse links in the primary group using alphabetical indices
! (H5_INDEX_NAME).
!
WRITE(*,'("Traversing group using alphabetical indices:")')
DO i = 0, nlinks-1
!
! Get name and size of name
!
CALL H5Lget_name_by_idx_f(group, ".", H5_INDEX_NAME_F, H5_ITER_INC_F, i, name, hdferr, size)
WRITE(*,'("Index ",i2,": ",A)') INT(i), TRIM(name)
ENDDO
!
!Traverse links in the primary group by creation order
! (H5_INDEX_CRT_ORDER).
!
WRITE(*,'(/,"Traversing group using creation order indices:")')
DO i = 0, nlinks-1
!
! Get name and size of name
!
CALL H5Lget_name_by_idx_f(group, ".", H5_INDEX_CRT_ORDER_F, H5_ITER_INC_F, i, name, hdferr, size)
WRITE(*,'("Index ",i2,": ",A)') INT(i), TRIM(name)
ENDDO
!
! Close and release resources.
!
CALL h5pclose_f(gcpl, hdferr)
CALL h5gclose_f(group, hdferr)
CALL h5fclose_f(file, hdferr)
END PROGRAM main
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