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// -*- C++ -*-

// Copyright (C) 2005 Free Software Foundation, Inc.

//

// This file is part of the GNU ISO C++ Library.  This library is free

// software; you can redistribute it and/or modify it under the

// terms of the GNU General Public License as published by the

// Free Software Foundation; either version 2, or (at your option)

// any later version.

// This library is distributed in the hope that it will be useful,

// but WITHOUT ANY WARRANTY; without even the implied warranty of

// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License along

// with this library; see the file COPYING.  If not, write to the Free

// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,

// USA.

// As a special exception, you may use this file as part of a free software

// library without restriction.  Specifically, if other files instantiate

// templates or use macros or inline functions from this file, or you compile

// this file and link it with other files to produce an executable, this

// file does not by itself cause the resulting executable to be covered by

// the GNU General Public License.  This exception does not however

// invalidate any other reasons why the executable file might be covered by

// the GNU General Public License.

// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.

// Permission to use, copy, modify, sell, and distribute this software

// is hereby granted without fee, provided that the above copyright

// notice appears in all copies, and that both that copyright notice and

// this permission notice appear in supporting documentation. None of

// the above authors, nor IBM Haifa Research Laboratories, make any

// representation about the suitability of this software for any

// purpose. It is provided "as is" without express or implied warranty.

/*

 * @file hash_load_check_resize_trigger_imp.hpp.hpp

 * Contains an implementation of hash_load_check_resize_trigger..

 */

PB_ASSOC_CLASS_T_DEC

pb_assoc::detail::int_to_type<External_Load_Access>

PB_ASSOC_CLASS_C_DEC::s_external_load_access_ind;

PB_ASSOC_CLASS_T_DEC

PB_ASSOC_CLASS_C_DEC::

hash_load_check_resize_trigger(float load_min, float load_max) :

  m_load_min(load_min),

  m_load_max(load_max),

  m_next_shrink_size(0),

  m_next_grow_size(0),

  m_resize_needed(false)

{

  PB_ASSOC_DBG_ONLY(assert_valid();)

    }

PB_ASSOC_CLASS_T_DEC

inline void

PB_ASSOC_CLASS_C_DEC::

notify_find_search_start()

{

  PB_ASSOC_DBG_ONLY(assert_valid();)

    }

PB_ASSOC_CLASS_T_DEC

inline void

PB_ASSOC_CLASS_C_DEC::

notify_find_search_collision()

{

  PB_ASSOC_DBG_ONLY(assert_valid();)

    }

PB_ASSOC_CLASS_T_DEC

inline void

PB_ASSOC_CLASS_C_DEC::

notify_find_search_end()

{

  PB_ASSOC_DBG_ONLY(assert_valid();)

    }

PB_ASSOC_CLASS_T_DEC

inline void

PB_ASSOC_CLASS_C_DEC::

notify_insert_search_start()

{

  PB_ASSOC_DBG_ONLY(assert_valid();)

    }

PB_ASSOC_CLASS_T_DEC

inline void

PB_ASSOC_CLASS_C_DEC::

notify_insert_search_collision()

{

  PB_ASSOC_DBG_ONLY(assert_valid();)

    }

PB_ASSOC_CLASS_T_DEC

inline void

PB_ASSOC_CLASS_C_DEC::

notify_insert_search_end()

{

  PB_ASSOC_DBG_ONLY(assert_valid();)

    }

PB_ASSOC_CLASS_T_DEC

inline void

PB_ASSOC_CLASS_C_DEC::

notify_erase_search_start()

{

  PB_ASSOC_DBG_ONLY(assert_valid();)

    }

PB_ASSOC_CLASS_T_DEC

inline void

PB_ASSOC_CLASS_C_DEC::

notify_erase_search_collision()

{

  PB_ASSOC_DBG_ONLY(assert_valid();)

    }

PB_ASSOC_CLASS_T_DEC

inline void

PB_ASSOC_CLASS_C_DEC::

notify_erase_search_end()

{

  PB_ASSOC_DBG_ONLY(assert_valid();)

    }

PB_ASSOC_CLASS_T_DEC

inline void

PB_ASSOC_CLASS_C_DEC::

notify_inserted(size_type num_entries)

{

  PB_ASSOC_DBG_ASSERT(num_entries <= m_next_grow_size);

  my_size_base::set_size(num_entries);

  m_resize_needed = (num_entries == m_next_grow_size);

  PB_ASSOC_DBG_ONLY(assert_valid();)

    }

PB_ASSOC_CLASS_T_DEC

inline void

PB_ASSOC_CLASS_C_DEC::

notify_erased(size_type num_entries)

{

  PB_ASSOC_DBG_ASSERT(num_entries >= m_next_shrink_size);

  my_size_base::set_size(num_entries);

  m_resize_needed = (num_entries == m_next_shrink_size);

  PB_ASSOC_DBG_ONLY(assert_valid();)

    PB_ASSOC_DBG_ONLY(assert_valid();)

    }

PB_ASSOC_CLASS_T_DEC

inline bool

PB_ASSOC_CLASS_C_DEC::

is_resize_needed() const

{

  PB_ASSOC_DBG_ONLY(assert_valid();)

    return (m_resize_needed);

}

PB_ASSOC_CLASS_T_DEC

inline bool

PB_ASSOC_CLASS_C_DEC::

is_grow_needed(size_type /*size*/, size_type num_entries) const

{

  PB_ASSOC_DBG_ASSERT(m_resize_needed);

  return (num_entries >= m_next_grow_size);

}

PB_ASSOC_CLASS_T_DEC

inline bool

PB_ASSOC_CLASS_C_DEC::

is_shrink_needed(size_type /*size*/, size_type num_entries) const

{

  PB_ASSOC_DBG_ASSERT(m_resize_needed);

  return (num_entries <= m_next_shrink_size);

}

PB_ASSOC_CLASS_T_DEC

PB_ASSOC_CLASS_C_DEC::

~hash_load_check_resize_trigger()

{ }

PB_ASSOC_CLASS_T_DEC

void

PB_ASSOC_CLASS_C_DEC::

notify_resized(size_type new_size)

{

  m_resize_needed = false;

  m_next_grow_size =

    size_type(m_load_max*  new_size - 1);

  m_next_shrink_size =

    size_type(m_load_min*  new_size );

  PB_ASSOC_DBG_ONLY(assert_valid();)

    }

PB_ASSOC_CLASS_T_DEC

void

PB_ASSOC_CLASS_C_DEC::

notify_externally_resized(size_type new_size)

{

  m_resize_needed = false;

  size_type new_grow_size =

    size_type(m_load_max*  new_size - 1);

  size_type new_shrink_size =

    size_type(m_load_min*  new_size );

  if (new_grow_size >= m_next_grow_size)

    {

      PB_ASSOC_DBG_ASSERT(new_shrink_size > m_next_shrink_size);

      m_next_grow_size = new_grow_size;

      PB_ASSOC_DBG_ONLY(assert_valid();)

        return;

    }

  PB_ASSOC_DBG_ASSERT(new_shrink_size <= m_next_shrink_size);

  m_next_shrink_size = new_shrink_size;

  PB_ASSOC_DBG_ONLY(assert_valid();)

    }

PB_ASSOC_CLASS_T_DEC

void

PB_ASSOC_CLASS_C_DEC::

notify_cleared()

{

  my_size_base::set_size(0);

  m_resize_needed = (0 < m_next_shrink_size);

  PB_ASSOC_DBG_ONLY(assert_valid();)

    }

PB_ASSOC_CLASS_T_DEC

void

PB_ASSOC_CLASS_C_DEC::

swap(PB_ASSOC_CLASS_C_DEC& r_other)

{

  PB_ASSOC_DBG_ONLY(assert_valid();)

    PB_ASSOC_DBG_ONLY(r_other.assert_valid();)

    my_size_base::swap(r_other);

  std::swap(m_load_min, r_other.m_load_min);

  std::swap(m_load_max, r_other.m_load_max);

  std::swap(m_resize_needed, r_other.m_resize_needed);

  std::swap(m_next_grow_size, r_other.m_next_grow_size);

  std::swap(m_next_shrink_size, r_other.m_next_shrink_size);

  PB_ASSOC_DBG_ONLY(assert_valid();)

    PB_ASSOC_DBG_ONLY(r_other.assert_valid();)

    }

PB_ASSOC_CLASS_T_DEC

inline std::pair<float, float>

PB_ASSOC_CLASS_C_DEC::

get_loads() const

{

  return (get_loads_imp(s_external_load_access_ind));

}

PB_ASSOC_CLASS_T_DEC

void

PB_ASSOC_CLASS_C_DEC::

set_loads(std::pair<float, float> load_pair)

{

  set_loads_imp(load_pair, s_external_load_access_ind);

}

PB_ASSOC_CLASS_T_DEC

inline std::pair<float, float>

PB_ASSOC_CLASS_C_DEC::

get_loads_imp(pb_assoc::detail::int_to_type<true>) const

{

  return (std::make_pair(m_load_min, m_load_max));

}

PB_ASSOC_CLASS_T_DEC

void

PB_ASSOC_CLASS_C_DEC::

set_loads_imp(std::pair<float, float> load_pair, pb_assoc::detail::int_to_type<true>)

{

  const float old_load_min = m_load_min;

  const float old_load_max = m_load_max;

  const size_type old_next_shrink_size = m_next_shrink_size;

  const size_type old_next_grow_size = m_next_grow_size;

  const bool old_resize_needed = m_resize_needed;

  try

    {

      m_load_min = load_pair.first;

      m_load_max = load_pair.second;

      do_resize(static_cast<size_type>(

                                       my_size_base::get_size() / ((m_load_min + m_load_max) / 2)));

    }

  catch(...)

    {

      m_load_min = old_load_min;

      m_load_max = old_load_max;

      m_next_shrink_size = old_next_shrink_size;

      m_next_grow_size = old_next_grow_size;

      m_resize_needed = old_resize_needed;

      throw;

    }

}

PB_ASSOC_CLASS_T_DEC

void

PB_ASSOC_CLASS_C_DEC::

do_resize(size_type /*new_size*/)

{

  abort();

}

#ifdef PB_ASSOC_HT_LOAD_CHECK_RESIZE_TRIGGER_DEBUG

PB_ASSOC_CLASS_T_DEC

void

PB_ASSOC_CLASS_C_DEC::

assert_valid() const

{

  PB_ASSOC_DBG_ASSERT(m_load_max > m_load_min);

  PB_ASSOC_DBG_ASSERT(m_next_grow_size >= m_next_shrink_size);

}

#endif // #ifdef PB_ASSOC_HT_LOAD_CHECK_RESIZE_TRIGGER_DEBUG