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/****************************************************************************
**
** Copyright (C) 2021 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of Qt Creator.
**
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
****************************************************************************/
#pragma once
#include <utils/optional.h>
#include <utils/smallstringview.h>
#include <type_traits>
namespace Sqlite {
constexpr int compare(Utils::SmallStringView first, Utils::SmallStringView second) noexcept
{
return first.compare(second);
}
enum class UpdateChange { No, Update };
template<typename SqliteRange,
typename Range,
typename CompareKey,
typename InsertCallback,
typename UpdateCallback,
typename DeleteCallback>
void insertUpdateDelete(SqliteRange &&sqliteRange,
Range &&values,
CompareKey compareKey,
InsertCallback insertCallback,
UpdateCallback updateCallback,
DeleteCallback deleteCallback)
{
auto currentSqliteIterator = sqliteRange.begin();
auto endSqliteIterator = sqliteRange.end();
auto currentValueIterator = values.begin();
auto endValueIterator = values.end();
Utils::optional<std::decay_t<decltype(*currentValueIterator)>> lastValue;
while (true) {
bool hasMoreValues = currentValueIterator != endValueIterator;
bool hasMoreSqliteValues = currentSqliteIterator != endSqliteIterator;
if (hasMoreValues && hasMoreSqliteValues) {
auto &&sqliteValue = *currentSqliteIterator;
auto &&value = *currentValueIterator;
auto compare = compareKey(sqliteValue, value);
if (compare == 0) {
UpdateChange updateChange = updateCallback(sqliteValue, value);
switch (updateChange) {
case UpdateChange::Update:
lastValue = value;
break;
case UpdateChange::No:
lastValue.reset();
break;
}
++currentSqliteIterator;
++currentValueIterator;
} else if (compare > 0) {
insertCallback(value);
++currentValueIterator;
} else if (compare < 0) {
if (lastValue) {
if (compareKey(sqliteValue, *lastValue) != 0)
deleteCallback(sqliteValue);
lastValue.reset();
} else {
deleteCallback(sqliteValue);
}
++currentSqliteIterator;
}
} else if (hasMoreValues) {
insertCallback(*currentValueIterator);
++currentValueIterator;
} else if (hasMoreSqliteValues) {
auto &&sqliteValue = *currentSqliteIterator;
if (lastValue) {
if (compareKey(sqliteValue, *lastValue) != 0)
deleteCallback(sqliteValue);
lastValue.reset();
} else {
deleteCallback(sqliteValue);
}
++currentSqliteIterator;
} else {
break;
}
}
}
} // namespace Sqlite
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