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/****************************************************************************
**
** Copyright (C) 2020 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.
**
****************************************************************************/
#include "sqlitesessionchangeset.h"
#include "sqliteexception.h"
#include "sqlitesessions.h"
#include <utils/smallstringio.h>
#include <sqlite.h>
namespace Sqlite {
namespace {
void checkSessionChangeSetCreation(int resultCode)
{
switch (resultCode) {
case SQLITE_NOMEM:
throw std::bad_alloc();
}
if (resultCode != SQLITE_OK)
throw UnknowError("Unknow exception");
}
void checkIteratorCreation(int resultCode)
{
if (resultCode != SQLITE_OK)
throw Sqlite::CannotCreateChangeSetIterator{
"SessionChangeSet: Cannot create iterator from blob."};
}
void checkIteratorOperation(int resultCode)
{
if (resultCode != SQLITE_OK)
throw Sqlite::CannotGetChangeSetOperation{
"SessionChangeSet: Cannot create iterator from blob."};
}
void checkChangeSetValue(int resultCode)
{
switch (resultCode) {
case SQLITE_OK:
return;
case SQLITE_RANGE:
throw Sqlite::ChangeSetTupleIsOutOfRange{
"SessionChangeSet: You tried to access a non existing column."};
case SQLITE_MISUSE:
throw Sqlite::ChangeSetIsMisused{
"SessionChangeSet: Some misuse happened as you tried to access."};
}
throw Sqlite::UnknownError{"SessionChangeSet: Some unknown error happened."};
}
ValueView convertSqliteValue(sqlite3_value *value)
{
if (value) {
int type = sqlite3_value_type(value);
switch (type) {
case SQLITE_INTEGER:
return ValueView::create(sqlite3_value_int64(value));
case SQLITE_FLOAT:
return ValueView::create(sqlite3_value_double(value));
case SQLITE_TEXT:
return ValueView::create(
Utils::SmallStringView{reinterpret_cast<const char *>(sqlite3_value_text(value)),
static_cast<std::size_t>(sqlite3_value_bytes(value))});
case SQLITE_NULL:
return ValueView::create(NullValue{});
}
}
return ValueView::create(NullValue{});
}
} // namespace
SessionChangeSet::SessionChangeSet(BlobView blob)
: m_data(sqlite3_malloc64(blob.size()))
, m_size(int(blob.size()))
{
std::memcpy(m_data, blob.data(), blob.size());
}
SessionChangeSet::SessionChangeSet(Sessions &session)
{
int resultCode = sqlite3session_changeset(session.session.get(), &m_size, &m_data);
checkSessionChangeSetCreation(resultCode);
}
SessionChangeSet::~SessionChangeSet()
{
sqlite3_free(m_data);
}
BlobView SessionChangeSet::asBlobView() const
{
return {static_cast<const std::byte *>(m_data), static_cast<std::size_t>(m_size)};
}
SessionChangeSetInternal::ConstIterator SessionChangeSet::begin() const
{
sqlite3_changeset_iter *sessionIterator;
int resultCode = sqlite3changeset_start(&sessionIterator, m_size, m_data);
checkIteratorCreation(resultCode);
SessionChangeSetInternal::ConstIterator iterator{sessionIterator};
++iterator;
return iterator;
}
namespace SessionChangeSetInternal {
ConstIterator::~ConstIterator()
{
sqlite3changeset_finalize(m_sessionIterator);
}
namespace {
State convertState(int state)
{
switch (state) {
case SQLITE_ROW:
return State::Row;
case SQLITE_DONE:
return State::Done;
}
return State::Invalid;
}
Operation convertOperation(int operation)
{
switch (operation) {
case SQLITE_INSERT:
return Operation::Insert;
case SQLITE_UPDATE:
return Operation::Update;
case SQLITE_DELETE:
return Operation::Delete;
}
return Operation::Invalid;
}
} // namespace
ConstIterator &ConstIterator::operator++()
{
int state = sqlite3changeset_next(m_sessionIterator);
m_state = convertState(state);
return *this;
}
Tuple ConstIterator::operator*() const
{
const char *table;
int columnCount;
int operation;
int isIndirect;
int resultCode = sqlite3changeset_op(m_sessionIterator, &table, &columnCount, &operation, &isIndirect);
checkIteratorOperation(resultCode);
return {table, m_sessionIterator, columnCount, convertOperation(operation)};
}
namespace {
ValueViews fetchValues(sqlite3_changeset_iter *sessionIterator, int column, Operation operation)
{
sqlite3_value *newValue = nullptr;
if (operation == Operation::Insert || operation == Operation::Update) {
int resultCode = sqlite3changeset_new(sessionIterator, column, &newValue);
checkChangeSetValue(resultCode);
}
sqlite3_value *oldValue = nullptr;
if (operation == Operation::Delete || operation == Operation::Update) {
int resultCode = sqlite3changeset_old(sessionIterator, column, &oldValue);
checkChangeSetValue(resultCode);
}
return {convertSqliteValue(newValue), convertSqliteValue(oldValue)};
}
} // namespace
ValueViews ConstTupleIterator::operator*() const
{
return fetchValues(m_sessionIterator, m_column, m_operation);
}
ValueViews Tuple::operator[](int column) const
{
return fetchValues(sessionIterator, column, operation);
}
} // namespace SessionChangeSetInternal
} // namespace Sqlite
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