btree_unique.cpp

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/*
 * Copyright 2008 Search Solution Corporation
 * Copyright 2016 CUBRID Corporation
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 */

//
// Unique b-tree definitions
//

#include "btree_unique.hpp"

#include "string_buffer.hpp"

#include <utility>

btree_unique_stats::btree_unique_stats (stat_type keys, stat_type nulls /* = 0 */)
  : m_rows (keys + nulls)
  , m_keys (keys)
  , m_nulls (nulls)
{
}

btree_unique_stats::btree_unique_stats ()
  : btree_unique_stats (0, 0)
{
}

btree_unique_stats::stat_type
btree_unique_stats::get_key_count () const
{
  return m_keys;
}

btree_unique_stats::stat_type
btree_unique_stats::get_row_count () const
{
  return m_rows;
}

btree_unique_stats::stat_type
btree_unique_stats::get_null_count () const
{
  return m_nulls;
}

void
btree_unique_stats::insert_key_and_row ()
{
  ++m_keys;
  ++m_rows;
}

void
btree_unique_stats::insert_null_and_row ()
{
  ++m_nulls;
  ++m_rows;
}

void
btree_unique_stats::add_row ()
{
  ++m_rows;
}

void
btree_unique_stats::delete_key_and_row ()
{
  --m_keys;
  --m_rows;
}

void
btree_unique_stats::delete_null_and_row ()
{
  --m_nulls;
  --m_rows;
}

void
btree_unique_stats::delete_row ()
{
  --m_rows;
}

bool
btree_unique_stats::is_zero () const
{
  return m_keys == 0 && m_nulls == 0;
}

bool
btree_unique_stats::is_unique () const
{
  return m_rows == m_keys + m_nulls;
}

btree_unique_stats &
btree_unique_stats::operator= (const btree_unique_stats &us)
{
  m_rows = us.m_rows;
  m_keys = us.m_keys;
  m_nulls = us.m_nulls;

  return *this;
}

void
btree_unique_stats::operator+= (const btree_unique_stats &us)
{
  m_rows += us.m_rows;
  m_keys += us.m_keys;
  m_nulls += us.m_nulls;
}

void
btree_unique_stats::operator-= (const btree_unique_stats &us)
{
  m_rows -= us.m_rows;
  m_keys -= us.m_keys;
  m_nulls -= us.m_nulls;
}

void
btree_unique_stats::to_string (string_buffer &strbuf) const
{
  strbuf ("oids=%d keys=%d nulls=%d", m_rows, m_keys, m_nulls);
}

void
multi_index_unique_stats::construct ()
{
  new (this) multi_index_unique_stats ();
}

void
multi_index_unique_stats::destruct ()
{
  this->~multi_index_unique_stats ();
}

void
multi_index_unique_stats::add_index_stats (const BTID &index, const btree_unique_stats &us)
{
  assert (!BTID_IS_NULL (&index));
  m_stats_map[index] += us;
}

void
multi_index_unique_stats::add_empty (const BTID &index)
{
  assert (!BTID_IS_NULL (&index));
  m_stats_map[index] = btree_unique_stats ();
}

void
multi_index_unique_stats::clear ()
{
  m_stats_map.clear ();
}

const multi_index_unique_stats::container_type &
multi_index_unique_stats::get_map () const
{
  return m_stats_map;
}

bool
multi_index_unique_stats::empty () const
{
  return m_stats_map.empty ();
}

btree_unique_stats &
multi_index_unique_stats::get_stats_of (const BTID &index)
{
  assert (!BTID_IS_NULL (&index));
  return m_stats_map[index];
}

void
multi_index_unique_stats::to_string (string_buffer &strbuf) const
{
  strbuf ("{");
  for (container_type::const_iterator it = m_stats_map.cbegin (); it != m_stats_map.cend (); ++it)
    {
      if (it != m_stats_map.cbegin ())
    {
      strbuf (", ");
    }
      strbuf ("{btid=%d|%d|%d, ", it->first.root_pageid, it->first.vfid.volid, it->first.vfid.fileid);
      it->second.to_string (strbuf);
      strbuf ("}");
    }
  strbuf ("}");
}

multi_index_unique_stats &
multi_index_unique_stats::operator= (multi_index_unique_stats &&other)
{
  m_stats_map = std::move (other.m_stats_map);
  return *this;
}

void
multi_index_unique_stats::operator+= (const multi_index_unique_stats &other)
{
  // collector all stats from other.m_stats_map
  for (const auto &it : other.m_stats_map)
    {
      m_stats_map[it.first] += it.second;
    }
}