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/*
* Copyright (C) 2014, 2016 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include "IDBCursorRecord.h"
#include "IDBIndexIdentifier.h"
#include "IDBIndexInfo.h"
#include "IDBKeyData.h"
#include "IDBKeyRangeData.h"
#include "IDBObjectStoreIdentifier.h"
#include "IDBResourceIdentifier.h"
#include "IDBValue.h"
#include "SQLiteStatement.h"
#include <wtf/CheckedPtr.h>
#include <wtf/Deque.h>
#include <wtf/Markable.h>
#include <wtf/Noncopyable.h>
#include <wtf/TZoneMalloc.h>
namespace WebCore {
class IDBCursorInfo;
class IDBGetResult;
namespace IDBServer {
class SQLiteIDBTransaction;
class SQLiteIDBCursor {
WTF_MAKE_TZONE_ALLOCATED(SQLiteIDBCursor);
WTF_MAKE_NONCOPYABLE(SQLiteIDBCursor);
public:
static std::unique_ptr<SQLiteIDBCursor> maybeCreate(SQLiteIDBTransaction&, const IDBCursorInfo&);
static std::unique_ptr<SQLiteIDBCursor> maybeCreateBackingStoreCursor(SQLiteIDBTransaction&, IDBObjectStoreIdentifier, std::optional<IDBIndexIdentifier>, const IDBKeyRangeData&);
SQLiteIDBCursor(SQLiteIDBTransaction&, const IDBCursorInfo&);
SQLiteIDBCursor(SQLiteIDBTransaction&, IDBObjectStoreIdentifier, std::optional<IDBIndexIdentifier>, const IDBKeyRangeData&);
~SQLiteIDBCursor();
const IDBResourceIdentifier& identifier() const { return m_cursorIdentifier; }
SQLiteIDBTransaction* transaction() const;
IDBObjectStoreIdentifier objectStoreID() const { return m_objectStoreID; }
int64_t currentRecordRowID() const;
const IDBKeyData& currentKey() const;
const IDBKeyData& currentPrimaryKey() const;
const IDBValue& currentValue() const;
bool advance(uint64_t count);
bool iterate(const IDBKeyData& targetKey, const IDBKeyData& targetPrimaryKey);
bool prefetchOneRecord();
bool prefetch();
bool didComplete() const;
bool didError() const;
void objectStoreRecordsChanged();
enum class ShouldIncludePrefetchedRecords : bool { No, Yes };
void currentData(IDBGetResult&, const std::optional<IDBKeyPath>&, ShouldIncludePrefetchedRecords = ShouldIncludePrefetchedRecords::No);
private:
bool establishStatement();
bool createSQLiteStatement(StringView sql);
bool bindArguments();
bool resetAndRebindPreIndexStatementIfNecessary();
void resetAndRebindStatement();
enum class FetchResult {
Success,
Failure,
ShouldFetchAgain
};
bool fetch();
struct SQLiteCursorRecord {
IDBCursorRecord record;
bool completed { false };
bool errored { false };
int64_t rowID { 0 };
bool isTerminalRecord() const { return completed || errored; }
};
bool fetchNextRecord(SQLiteCursorRecord&);
FetchResult internalFetchNextRecord(SQLiteCursorRecord&);
void markAsErrored(SQLiteCursorRecord&);
bool isDirectionNext() const { return m_cursorDirection == IndexedDB::CursorDirection::Next || m_cursorDirection == IndexedDB::CursorDirection::Nextunique; }
void increaseCountToPrefetch();
uint64_t boundIDValue() const;
CheckedPtr<SQLiteIDBTransaction> m_transaction;
IDBResourceIdentifier m_cursorIdentifier;
IDBObjectStoreIdentifier m_objectStoreID;
Markable<IDBIndexIdentifier> m_indexID;
IndexedDB::CursorDirection m_cursorDirection { IndexedDB::CursorDirection::Next };
IndexedDB::CursorType m_cursorType;
IDBKeyRangeData m_keyRange;
IDBKeyData m_currentLowerKey;
IDBKeyData m_currentUpperKey;
IDBKeyData m_currentIndexRecordValue;
Deque<SQLiteCursorRecord> m_fetchedRecords;
uint64_t m_fetchedRecordsSize { 0 };
IDBKeyData m_currentKeyForUniqueness;
std::unique_ptr<SQLiteStatement> m_preIndexStatement;
std::unique_ptr<SQLiteStatement> m_statement;
std::unique_ptr<SQLiteStatement> m_cachedObjectStoreStatement;
bool m_statementNeedsReset { true };
std::variant<IDBObjectStoreIdentifier, IDBIndexIdentifier> m_boundID;
bool m_backingStoreCursor { false };
unsigned m_prefetchCount { 0 };
};
} // namespace IDBServer
} // namespace WebCore
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