point_zone_registry.f90

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! Copyright (c) 2019-2024, The Neko Authors
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! Implements a point zone registry for storing point zones.
module point_zone_registry
  use point_zone, only : point_zone_t, point_zone_wrapper_t, &
       point_zone_factory
  use combine_point_zone, only : combine_point_zone_t
  use dofmap, only : dofmap_t
  use mesh, only : mesh_t
  use space, only : space_t, gll
  use utils, only : neko_error
  use json_utils, only : json_get
  use json_module, only : json_file, json_core, json_value
  implicit none
  private
 
  type :: point_zone_registry_t
     type(point_zone_wrapper_t), allocatable :: point_zones(:)
     integer, private :: n = 0
     integer, private :: expansion_size
   contains
     procedure, private, pass(this) :: expand
     procedure, pass(this) :: init => point_zone_registry_init
     procedure, pass(this) :: free => point_zone_registry_free
     procedure, pass(this) :: add_point_zone_from_json
     procedure, pass(this) :: n_point_zones
     procedure, pass(this) :: get_point_zone_by_index
     procedure, pass(this) :: get_point_zone_by_name
     procedure, pass(this) :: get_expansion_size
     procedure, pass(this) :: get_size
     procedure, pass(this) :: point_zone_exists
     generic :: get_point_zone => get_point_zone_by_index, &
          get_point_zone_by_name
     generic :: add_point_zone => add_point_zone_from_json
  end type point_zone_registry_t
 
  type(point_zone_registry_t), public, target :: neko_point_zone_registry
 
contains
  subroutine point_zone_registry_init(this, json, msh, expansion_size)
    class(point_zone_registry_t), intent(inout) :: this
    type(json_file), intent(inout) :: json
    type(mesh_t), target, intent(inout) :: msh
    integer, optional, intent(in) :: expansion_size
 
    ! Json low-level manipulator.
    type(json_core) :: core
    ! Pointer to the source_terms JSON object and the individual sources.
    type(json_value), pointer :: source_object, source_pointer
    ! Buffer for serializing the json.
    character(len=:), allocatable :: buffer
    ! A single source term as its own json_file.
    type(json_file) :: source_subdict
    logical :: found
    integer :: n_zones, i, izone
    character(len=:), allocatable :: type_name
 
    ! Parameters used to setup the GLL space.
    integer :: order
    type(space_t), target :: Xh
    type(dofmap_t) :: dof
 
 
    call json_get(json, 'case.numerics.polynomial_order', order)
    order = order + 1 ! add 1 to get poly order
 
    if (msh%gdim .eq. 2) then
       call xh%init(gll, order, order)
    else
       call xh%init(gll, order, order, order)
    end if
    call dof%init(msh, xh)
 
    call this%free()
 
    if (present(expansion_size)) then
       this%expansion_size = expansion_size
    else
       this%expansion_size = 10
    end if
 
    this%n = 0
 
    !
    ! Count if there are any point zones defined in the json
    !
    if (json%valid_path('case.point_zones')) then
 
       call json%get_core(core)
       call json%get('case.point_zones', source_object, found)
 
       n_zones = core%count(source_object)
       this%n = n_zones
 
       allocate(this%point_zones(n_zones))
 
       ! Initialize all the primitive zones
       izone = 1
       do i = 1, n_zones
 
          ! Create a new json containing just the subdict for this source.
          call core%get_child(source_object, i, source_pointer, found)
          call core%print_to_string(source_pointer, buffer)
          call source_subdict%load_from_string(buffer)
 
          call json_get(source_subdict, "geometry", type_name)
          if (trim(type_name) .ne. "combine") then
             call point_zone_factory(this%point_zones(izone)%pz, &
                  source_subdict, dof)
             izone = izone + 1
          end if
       end do
 
       ! Now initialize the combine zones
       do i = 1, n_zones
 
          ! Create a new json containing just the subdict for this source.
          call core%get_child(source_object, i, source_pointer, found)
          call core%print_to_string(source_pointer, buffer)
          call source_subdict%load_from_string(buffer)
 
          call json_get(source_subdict, "geometry", type_name)
          if (trim(type_name) .eq. "combine") then
             call build_combine_point_zone(this%point_zones(izone)%pz, &
                  source_subdict, dof)
             izone = izone + 1
          end if
       end do
 
    end if
 
    call xh%free()
    call dof%free()
 
  end subroutine point_zone_registry_init
 
  subroutine build_combine_point_zone(object, json, dof)
    class(point_zone_t), allocatable, target, intent(inout) :: object
    type(json_file), intent(inout) :: json
    type(dofmap_t), intent(inout) :: dof
 
    type(combine_point_zone_t), pointer :: cpz
    integer :: i, i_external
 
    allocate(combine_point_zone_t::object)
 
    ! Here we initialize all the names of the zones to combine
    call object%init(json, dof%size())
 
    select type (object)
    type is (combine_point_zone_t)
       cpz => object
    class default
    end select
 
    i_external = 1
    ! Load the external zones in the combine zone array
    do i = cpz%n_internal_zones + 1, cpz%n_zones
       cpz%zones(i)%pz => &
            neko_point_zone_registry%get_point_zone(cpz%names(i_external))
    end do
 
    call object%map(dof)
    call object%finalize()
 
  end subroutine build_combine_point_zone
 
  subroutine point_zone_registry_free(this)
    class(point_zone_registry_t), intent(inout) :: this
    integer :: i
 
    if (allocated(this%point_zones)) then
 
       do i = 1, this%n_point_zones()
          call this%point_zones(i)%pz%free()
       end do
 
       deallocate(this%point_zones)
 
    end if
 
    this%n = 0
    this%expansion_size = 0
  end subroutine point_zone_registry_free
 
  subroutine expand(this)
    class(point_zone_registry_t), intent(inout) :: this
    type(point_zone_wrapper_t), allocatable :: temp(:)
 
    allocate(temp(this%n + this%expansion_size))
    temp(1:this%n) = this%point_zones(1:this%n)
    call move_alloc(temp, this%point_zones)
 
  end subroutine expand
 
  subroutine add_point_zone_from_json(this, json, dof)
    class(point_zone_registry_t), intent(inout) :: this
    type(json_file), intent(inout) :: json
    type(dofmap_t), target, intent(inout) :: dof
!    type(h_cptr_t) :: key
    character(len=:), allocatable :: str_read
 
    !
    ! Allocate the point zones array as it was not necessarily done
    ! in init
    !
    if (.not. allocated(this%point_zones)) then
       allocate(this%point_zones(this%expansion_size))
    end if
 
    call json_get(json, "name", str_read)
 
    ! Check if point zone exists with the input name
    if (this%point_zone_exists(trim(str_read))) then
       call neko_error("Field with name " // trim(str_read) // &
            " is already registered")
    end if
 
    !
    ! This will always be true if point_zones was allocated in
    ! init.
    !
    if (this%n_point_zones() .eq. this%get_size()) then
       call this%expand()
    end if
 
    this%n = this%n + 1
 
    ! initialize the point_zone at the appropriate index
    call point_zone_factory(this%point_zones(this%n)%pz, json, dof)
 
    ! generate a key for the name lookup map and assign it to the index
    !    key%ptr = c_loc(fld_name)
    !    call this%name_index_map%set(key, this%n)
 
    !    write(*,*) "HTABLE DATA, ", this%name_index_map%get(key, i)
  end subroutine add_point_zone_from_json
 
  pure function n_point_zones(this) result(n)
    class(point_zone_registry_t), intent(in) :: this
    integer :: n
 
    n = this%n
  end function n_point_zones
 
  pure function get_size(this) result(n)
    class(point_zone_registry_t), intent(in) :: this
    integer :: n
 
    n = size(this%point_zones)
  end function get_size
 
  pure function get_expansion_size(this) result(n)
    class(point_zone_registry_t), intent(in) :: this
    integer :: n
 
    n = this%expansion_size
  end function get_expansion_size
 
  function get_point_zone_by_index(this, i) result(pz)
    class(point_zone_registry_t), target, intent(in) :: this
    integer, intent(in) :: i
    class(point_zone_t), pointer :: pz
 
    if (i < 1) then
       call neko_error("Field index must be > 1")
    else if (i > this%n_point_zones()) then
       call neko_error("Field index exceeds number of stored point_zones")
    end if
 
    pz => this%point_zones(i)%pz
  end function get_point_zone_by_index
 
  function get_point_zone_by_name(this, name) result(pz)
    class(point_zone_registry_t), target, intent(in) :: this
    character(len=*), intent(in) :: name
    class(point_zone_t), pointer :: pz
    logical :: found
    integer :: i
 
    found = .false.
    do i = 1, this%n_point_zones()
       if (trim(this%point_zones(i)%pz%name) .eq. trim(name)) then
          pz => this%point_zones(i)%pz
          found = .true.
          exit
       end if
    end do
 
    if (.not. found) then
       call neko_error("Point zone " // trim(name) // &
            " could not be found in the registry")
    end if
  end function get_point_zone_by_name
 
  function point_zone_exists(this, name) result(found)
    class(point_zone_registry_t), target, intent(in) :: this
    character(len=*), intent(in) :: name
    logical :: found
    integer :: i
 
    found = .false.
    do i = 1, this%n_point_zones()
       if (trim(this%point_zones(i)%pz%name) .eq. trim(name)) then
          found = .true.
          exit
       end if
    end do
  end function point_zone_exists
 
end module point_zone_registry