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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 split_join_fn_imps.hpp

 * Contains an implementation class for ov_tree_.

 */

PB_ASSOC_CLASS_T_DEC

void

PB_ASSOC_CLASS_C_DEC::

split(const_key_reference r_key, PB_ASSOC_CLASS_C_DEC& r_other)

{

  PB_ASSOC_DBG_ONLY(assert_valid();)

    PB_ASSOC_DBG_ONLY(r_other.assert_valid();)

    if (m_size == 0)

      {

        r_other.clear();

        PB_ASSOC_DBG_ONLY(assert_valid();)

          PB_ASSOC_DBG_ONLY(r_other.assert_valid();)

          return;

      }

  if (Cmp_Fn::operator()(r_key, PB_ASSOC_V2F(*begin())))

    {

      swap(r_other);

      PB_ASSOC_DBG_ONLY(assert_valid();)

        PB_ASSOC_DBG_ONLY(r_other.assert_valid();)

        return;

    }

  if (!Cmp_Fn::operator()(

                          r_key,

                          PB_ASSOC_V2F(*(end() - 1))))

    {

      PB_ASSOC_DBG_ONLY(assert_valid();)

        PB_ASSOC_DBG_ONLY(r_other.assert_valid();)

        return;

    }

  if (m_size == 1)

    {

      swap(r_other);

      PB_ASSOC_DBG_ONLY(assert_valid();)

        PB_ASSOC_DBG_ONLY(r_other.assert_valid();)

        return;

    }

#ifdef PB_ASSOC_BIN_SEARCH_TREE_DEBUG_

  for (const_iterator it = begin(); it != end(); ++it)

    if (Cmp_Fn::operator()(

                           r_key,

                           PB_ASSOC_V2F(*it)))

      {

        my_map_debug_base::erase_existing(PB_ASSOC_V2F(*it));

        r_other.my_map_debug_base::insert_new(PB_ASSOC_V2F(*it));

      }

#endif // PB_ASSOC_BIN_SEARCH_TREE_DEBUG_

  iterator it = upper_bound(r_key);

  PB_ASSOC_CLASS_C_DEC new_other(r_other, r_other);

  new_other.copy_from_ordered_range(it, end());

  PB_ASSOC_CLASS_C_DEC new_this(*this, * this);

  new_this.copy_from_ordered_range(begin(), it);

  // No exceptions from this point.

  r_other.update(r_other.node_begin(), (Node_Updator* )(&r_other));

  update(node_begin(), (Node_Updator* )this);

  r_other.swap(new_other);

  swap(new_this);

  PB_ASSOC_DBG_ONLY(assert_valid();)

    PB_ASSOC_DBG_ONLY(r_other.assert_valid();)

    }

PB_ASSOC_CLASS_T_DEC

void

PB_ASSOC_CLASS_C_DEC::

join(PB_ASSOC_CLASS_C_DEC& r_other)

{

  PB_ASSOC_DBG_ONLY(assert_valid();)

    PB_ASSOC_DBG_ONLY(r_other.assert_valid();)

    if (r_other.m_size == 0)

      return;

  if (m_size == 0)

    {

      swap(r_other);

      return;

    }

  const bool greater = Cmp_Fn::operator()(

                                          PB_ASSOC_V2F(*(end() - 1)),

                                          PB_ASSOC_V2F(*r_other.begin()));

  const bool lesser = Cmp_Fn::operator()(

                                         PB_ASSOC_V2F(*(r_other.end() - 1)),

                                         PB_ASSOC_V2F(*begin()));

  if (!greater&&  !lesser)

    throw cannot_join();

#ifdef PB_ASSOC_BIN_SEARCH_TREE_DEBUG_

  for (const_iterator other_it = r_other.begin(); other_it != r_other.end();

       ++other_it)

    {

      my_map_debug_base::insert_new(PB_ASSOC_V2F(*other_it));

      r_other.my_map_debug_base::erase_existing(PB_ASSOC_V2F(*other_it));

    }

#endif // PB_ASSOC_BIN_SEARCH_TREE_DEBUG_

  PB_ASSOC_CLASS_C_DEC new_this(*this, * this);

  if (greater)

    new_this.copy_from_ordered_range(

                                     begin(),

                                     end(),

                                     r_other.begin(),

                                     r_other.end());

  else

    new_this.copy_from_ordered_range(

                                     r_other.begin(),

                                     r_other.end(),

                                     begin(),

                                     end());

  // No exceptions from this point.

  swap(new_this);

  r_other.clear();

  PB_ASSOC_DBG_ONLY(assert_valid();)

    PB_ASSOC_DBG_ONLY(r_other.assert_valid();)

    }