!!$
!!$ 
!!$                           MLD2P4  version 2.0
!!$  MultiLevel Domain Decomposition Parallel Preconditioners Package
!!$             based on PSBLAS (Parallel Sparse BLAS version 3.3)
!!$  
!!$  (C) Copyright 2008, 2010, 2012, 2015
!!$
!!$                      Salvatore Filippone  University of Rome Tor Vergata
!!$                      Alfredo Buttari      CNRS-IRIT, Toulouse
!!$                      Pasqua D'Ambra       ICAR-CNR, Naples
!!$                      Daniela di Serafino  Second University of Naples
!!$ 
!!$  Redistribution and use in source and binary forms, with or without
!!$  modification, are permitted provided that the following conditions
!!$  are met:
!!$    1. Redistributions of source code must retain the above copyright
!!$       notice, this list of conditions and the following disclaimer.
!!$    2. Redistributions in binary form must reproduce the above copyright
!!$       notice, this list of conditions, and the following disclaimer in the
!!$       documentation and/or other materials provided with the distribution.
!!$    3. The name of the MLD2P4 group or the names of its contributors may
!!$       not be used to endorse or promote products derived from this
!!$       software without specific written permission.
!!$ 
!!$  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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!!$  TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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!!$  POSSIBILITY OF SUCH DAMAGE.
!!$ 
!!$
!
module mld_d_base_aggregator_mod

  use mld_base_prec_type
  use psb_base_mod, only : psb_dspmat_type, psb_d_vect_type, &
       & psb_d_base_vect_type, psb_dlinmap_type, psb_dpk_, &
       & psb_ipk_, psb_long_int_k_, psb_desc_type, psb_i_base_vect_type, &
       & psb_erractionsave, psb_error_handler
  !
  !   sm           -  class(mld_T_base_smoother_type), allocatable
  !                   The current level preconditioner (aka smoother).
  !   parms        -  type(mld_RTml_parms)
  !                   The parameters defining the multilevel strategy.
  !   ac           -  The local part of the current-level matrix, built by
  !                   coarsening the previous-level matrix.
  !   desc_ac      -  type(psb_desc_type).
  !                   The communication descriptor associated to the matrix
  !                   stored in ac.
  !   base_a       -  type(psb_Tspmat_type), pointer.
  !                   Pointer (really a pointer!) to the local part of the current 
  !                   matrix (so we have a unified treatment of residuals).
  !                   We need this to avoid passing explicitly the current matrix
  !                   to the routine which applies the preconditioner.
  !   base_desc    -  type(psb_desc_type), pointer.
  !                   Pointer to the communication descriptor associated to the
  !                   matrix pointed by base_a.
  !   map          -  Stores the maps (restriction and prolongation) between the
  !                   vector spaces associated to the index spaces of the previous
  !                   and current levels.
  !
  !   Methods:  
  !     Most methods follow the encapsulation hierarchy: they take whatever action
  !     is appropriate for the current object, then call the corresponding method for
  !     the contained object.
  !     As an example: the descr() method prints out a description of the
  !     level. It starts by invoking the descr() method of the parms object,
  !     then calls the descr() method of the smoother object. 
  !
  !    descr      -   Prints a description of the object.
  !    default    -   Set default values
  !    dump       -   Dump to file object contents
  !    set        -   Sets various parameters; when a request is unknown
  !                   it is passed to the smoother object for further processing.
  !    check      -   Sanity checks.
  !    sizeof     -   Total memory occupation in bytes
  !    get_nzeros -   Number of nonzeros 
  !
  !
  type mld_d_base_aggregator_type
    type(mld_dml_parms)              :: parms 
  contains
    procedure, pass(ag) :: bld     => mld_d_base_aggregation_build
  end type mld_d_onelev_type


  private :: d_base_onelev_default, d_base_onelev_sizeof, &
       & d_base_onelev_nullify, d_base_onelev_get_nzeros, &
       & d_base_onelev_clone, d_base_onelev_move_alloc



  interface
    subroutine mld_d_base_aggregation_build(ag,info,amold,vmold,imold)
      import :: psb_d_base_sparse_mat, psb_d_base_vect_type, &
           & psb_i_base_vect_type, psb_dpk_, mld_d_onelev_type, &
           & psb_ipk_, psb_long_int_k_, psb_desc_type
      implicit none
      class(mld_d_onelev_type), target, intent(inout) :: lv
      integer(psb_ipk_), intent(out) :: info
      class(psb_d_base_sparse_mat), intent(in), optional :: amold
      class(psb_d_base_vect_type), intent(in), optional  :: vmold
      class(psb_i_base_vect_type), intent(in), optional  :: imold
    end subroutine mld_d_base_aggregation_build
  end interface

  
contains

end module mld_d_base_aggregator_mod