void MemoryObjectStoreCursor::incrementReverseIterator(std::set<IDBKeyData>& set, const IDBKeyData& key, uint32_t count)
{
// We might need to re-grab the current iterator.
// e.g. If the record it was pointed to had been deleted.
bool didResetIterator = false;
if (!m_iterator) {
if (!m_currentPositionKey.isValid())
return;
m_remainingRange.upperKey = m_currentPositionKey;
m_remainingRange.upperOpen = false;
setFirstInRemainingRange(set);
didResetIterator = true;
}
if (*m_iterator == set.end())
return;
if (key.isValid()) {
// If iterating to a key, the count passed in must be zero, as there is no way to iterate by both a count and to a key.
ASSERT(!count);
if (!m_info.range().containsKey(key))
return;
if ((*m_iterator)->compare(key) > 0) {
m_remainingRange.upperKey = key;
m_remainingRange.upperOpen = false;
setFirstInRemainingRange(set);
}
return;
}
if (!count)
count = 1;
// If the reverseIterator was reset because it's previous record had been deleted,
// we might have already advanced past the current position, eating one one of the iteration counts.
if (didResetIterator && (*m_iterator)->compare(m_currentPositionKey) < 0)
--count;
while (count) {
if (*m_iterator == set.begin()) {
m_iterator = Nullopt;
return;
}
--count;
--*m_iterator;
if (!m_info.range().containsKey(**m_iterator)) {
m_iterator = Nullopt;
return;
}
}
}
MemoryObjectStoreCursor::MemoryObjectStoreCursor(MemoryObjectStore& objectStore, const IDBCursorInfo& info)
: MemoryCursor(info)
, m_objectStore(objectStore)
{
m_remainingRange = m_info.range();
auto* orderedKeys = objectStore.orderedKeys();
if (!orderedKeys)
return;
setFirstInRemainingRange(*orderedKeys);
}
MemoryObjectStoreCursor::MemoryObjectStoreCursor(MemoryObjectStore& objectStore, const IDBCursorInfo& info)
: MemoryCursor(info)
, m_objectStore(objectStore)
, m_remainingRange(info.range())
{
LOG(IndexedDB, "MemoryObjectStoreCursor::MemoryObjectStoreCursor %s", info.range().loggingString().utf8().data());
auto* orderedKeys = objectStore.orderedKeys();
if (!orderedKeys)
return;
setFirstInRemainingRange(*orderedKeys);
}