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/*
* Copyright (C) 2014 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 "IDBKey.h"
#include <variant>
#include <wtf/Hasher.h>
#include <wtf/StdSet.h>
#include <wtf/text/StringHash.h>
namespace WebCore {
class KeyedDecoder;
class KeyedEncoder;
class IDBKeyData {
WTF_MAKE_FAST_ALLOCATED;
public:
struct Date {
double value { 0.0 };
Date isolatedCopy() const { return { value }; }
};
struct Min { Min isolatedCopy() const { return { }; } };
struct Max { Max isolatedCopy() const { return { }; } };
struct Invalid { Invalid isolatedCopy() const { return { }; } };
using ValueVariant = std::variant<std::nullptr_t, Invalid, Vector<IDBKeyData>, String, double, Date, ThreadSafeDataBuffer, Min, Max>;
enum IsolatedCopyTag { IsolatedCopy };
IDBKeyData() = default;
IDBKeyData(ValueVariant&& value)
: m_value(WTFMove(value)) { }
IDBKeyData(const IDBKeyData&, IsolatedCopyTag);
WEBCORE_EXPORT IDBKeyData(const IDBKey*);
static IDBKeyData minimum()
{
IDBKeyData result;
result.m_value = Min { };
return result;
}
static IDBKeyData maximum()
{
IDBKeyData result;
result.m_value = Max { };
return result;
}
WEBCORE_EXPORT RefPtr<IDBKey> maybeCreateIDBKey() const;
WEBCORE_EXPORT IDBKeyData isolatedCopy() const;
WEBCORE_EXPORT void encode(KeyedEncoder&) const;
WEBCORE_EXPORT static WARN_UNUSED_RETURN bool decode(KeyedDecoder&, IDBKeyData&);
// compare() has the same semantics as strcmp().
// - Returns negative if this IDBKeyData is less than other.
// - Returns positive if this IDBKeyData is greater than other.
// - Returns zero if this IDBKeyData is equal to other.
WEBCORE_EXPORT int compare(const IDBKeyData& other) const;
void setArrayValue(const Vector<IDBKeyData>&);
void setBinaryValue(const ThreadSafeDataBuffer&);
void setStringValue(const String&);
void setDateValue(double);
WEBCORE_EXPORT void setNumberValue(double);
#if !LOG_DISABLED
WEBCORE_EXPORT String loggingString() const;
#endif
bool isNull() const { return std::holds_alternative<std::nullptr_t>(m_value); }
bool isValid() const;
IndexedDB::KeyType type() const;
bool operator<(const IDBKeyData&) const;
bool operator>(const IDBKeyData& other) const
{
return !(*this < other) && !(*this == other);
}
bool operator<=(const IDBKeyData& other) const
{
return !(*this > other);
}
bool operator>=(const IDBKeyData& other) const
{
return !(*this < other);
}
bool operator==(const IDBKeyData& other) const;
String string() const
{
return std::get<String>(m_value);
}
double date() const
{
return std::get<Date>(m_value).value;
}
double number() const
{
return std::get<double>(m_value);
}
const ThreadSafeDataBuffer& binary() const
{
return std::get<ThreadSafeDataBuffer>(m_value);
}
const Vector<IDBKeyData>& array() const
{
return std::get<Vector<IDBKeyData>>(m_value);
}
size_t size() const;
const ValueVariant& value() const { return m_value; };
private:
friend struct IDBKeyDataHashTraits;
bool m_isDeletedValue { false };
ValueVariant m_value;
};
inline void add(Hasher& hasher, const IDBKeyData& keyData)
{
add(hasher, keyData.type());
add(hasher, keyData.isNull());
switch (keyData.type()) {
case IndexedDB::KeyType::Invalid:
case IndexedDB::KeyType::Max:
case IndexedDB::KeyType::Min:
break;
case IndexedDB::KeyType::Number:
add(hasher, keyData.number());
break;
case IndexedDB::KeyType::Date:
add(hasher, keyData.date());
break;
case IndexedDB::KeyType::String:
add(hasher, keyData.string());
break;
case IndexedDB::KeyType::Binary:
add(hasher, keyData.binary());
break;
case IndexedDB::KeyType::Array:
add(hasher, keyData.array());
break;
}
}
struct IDBKeyDataHash {
static unsigned hash(const IDBKeyData& a) { return computeHash(a); }
static bool equal(const IDBKeyData& a, const IDBKeyData& b) { return a == b; }
static const bool safeToCompareToEmptyOrDeleted = false;
};
struct IDBKeyDataHashTraits : public WTF::CustomHashTraits<IDBKeyData> {
static const bool emptyValueIsZero = false;
static const bool hasIsEmptyValueFunction = true;
static void constructDeletedValue(IDBKeyData& key) { key.m_isDeletedValue = true; }
static bool isDeletedValue(const IDBKeyData& key) { return key.m_isDeletedValue; }
static IDBKeyData emptyValue()
{
return IDBKeyData();
}
static bool isEmptyValue(const IDBKeyData& key)
{
return key.isNull();
}
};
using IDBKeyDataSet = StdSet<IDBKeyData>;
} // namespace WebCore
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