/
IDBKeyData.h
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/
IDBKeyData.h
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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
#if ENABLE(INDEXED_DATABASE)
#include "IDBKey.h"
#include <set>
#include <wtf/Variant.h>
#include <wtf/text/StringHash.h>
namespace WebCore {
class KeyedDecoder;
class KeyedEncoder;
class IDBKeyData {
public:
IDBKeyData()
: m_type(KeyType::Invalid)
, m_isNull(true)
{
}
WEBCORE_EXPORT IDBKeyData(const IDBKey*);
enum IsolatedCopyTag { IsolatedCopy };
IDBKeyData(const IDBKeyData&, IsolatedCopyTag);
static IDBKeyData minimum()
{
IDBKeyData result;
result.m_type = KeyType::Min;
result.m_isNull = false;
return result;
}
static IDBKeyData maximum()
{
IDBKeyData result;
result.m_type = KeyType::Max;
result.m_isNull = false;
return result;
}
WEBCORE_EXPORT RefPtr<IDBKey> maybeCreateIDBKey() const;
IDBKeyData isolatedCopy() const;
WEBCORE_EXPORT void encode(KeyedEncoder&) const;
WEBCORE_EXPORT static 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);
template<class Encoder> void encode(Encoder&) const;
template<class Decoder> static std::optional<IDBKeyData> decode(Decoder&);
#if !LOG_DISABLED
WEBCORE_EXPORT String loggingString() const;
#endif
bool isNull() const { return m_isNull; }
bool isValid() const { return m_type != KeyType::Invalid; }
KeyType type() const { return m_type; }
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;
bool operator!=(const IDBKeyData& other) const
{
return !(*this == other);
}
unsigned hash() const
{
Vector<unsigned> hashCodes;
hashCodes.append(static_cast<unsigned>(m_type));
hashCodes.append(m_isNull ? 1 : 0);
hashCodes.append(m_isDeletedValue ? 1 : 0);
switch (m_type) {
case KeyType::Invalid:
case KeyType::Max:
case KeyType::Min:
break;
case KeyType::Number:
case KeyType::Date:
hashCodes.append(StringHasher::hashMemory<sizeof(double)>(&WTF::get<double>(m_value)));
break;
case KeyType::String:
hashCodes.append(StringHash::hash(WTF::get<String>(m_value)));
break;
case KeyType::Binary: {
auto* data = WTF::get<ThreadSafeDataBuffer>(m_value).data();
if (!data)
hashCodes.append(0);
else
hashCodes.append(StringHasher::hashMemory(data->data(), data->size()));
break;
}
case KeyType::Array:
for (auto& key : WTF::get<Vector<IDBKeyData>>(m_value))
hashCodes.append(key.hash());
break;
}
return StringHasher::hashMemory(hashCodes.data(), hashCodes.size() * sizeof(unsigned));
}
static IDBKeyData deletedValue();
bool isDeletedValue() const { return m_isDeletedValue; }
String string() const
{
ASSERT(m_type == KeyType::String);
return WTF::get<String>(m_value);
}
double date() const
{
ASSERT(m_type == KeyType::Date);
return WTF::get<double>(m_value);
}
double number() const
{
ASSERT(m_type == KeyType::Number);
return WTF::get<double>(m_value);
}
const ThreadSafeDataBuffer& binary() const
{
ASSERT(m_type == KeyType::Binary);
return WTF::get<ThreadSafeDataBuffer>(m_value);
}
const Vector<IDBKeyData>& array() const
{
ASSERT(m_type == KeyType::Array);
return WTF::get<Vector<IDBKeyData>>(m_value);
}
private:
static void isolatedCopy(const IDBKeyData& source, IDBKeyData& destination);
KeyType m_type;
Variant<Vector<IDBKeyData>, String, double, ThreadSafeDataBuffer> m_value;
bool m_isNull { false };
bool m_isDeletedValue { false };
};
struct IDBKeyDataHash {
static unsigned hash(const IDBKeyData& a) { return a.hash(); }
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)
{
new (&key) IDBKeyData;
key = IDBKeyData::deletedValue();
}
static bool isDeletedValue(const IDBKeyData& key)
{
return key.isDeletedValue();
}
static IDBKeyData emptyValue()
{
return IDBKeyData();
}
static bool isEmptyValue(const IDBKeyData& key)
{
return key.isNull();
}
};
template<class Encoder>
void IDBKeyData::encode(Encoder& encoder) const
{
encoder << m_isNull;
if (m_isNull)
return;
encoder.encodeEnum(m_type);
switch (m_type) {
case KeyType::Invalid:
case KeyType::Max:
case KeyType::Min:
break;
case KeyType::Array:
encoder << WTF::get<Vector<IDBKeyData>>(m_value);
break;
case KeyType::Binary:
encoder << WTF::get<ThreadSafeDataBuffer>(m_value);
break;
case KeyType::String:
encoder << WTF::get<String>(m_value);
break;
case KeyType::Date:
case KeyType::Number:
encoder << WTF::get<double>(m_value);
break;
}
}
template<class Decoder>
std::optional<IDBKeyData> IDBKeyData::decode(Decoder& decoder)
{
IDBKeyData keyData;
if (!decoder.decode(keyData.m_isNull))
return std::nullopt;
if (keyData.m_isNull)
return WTFMove(keyData);
if (!decoder.decodeEnum(keyData.m_type))
return std::nullopt;
switch (keyData.m_type) {
case KeyType::Invalid:
case KeyType::Max:
case KeyType::Min:
break;
case KeyType::Array:
keyData.m_value = Vector<IDBKeyData>();
if (!decoder.decode(WTF::get<Vector<IDBKeyData>>(keyData.m_value)))
return std::nullopt;
break;
case KeyType::Binary:
keyData.m_value = ThreadSafeDataBuffer();
if (!decoder.decode(WTF::get<ThreadSafeDataBuffer>(keyData.m_value)))
return std::nullopt;
break;
case KeyType::String:
keyData.m_value = String();
if (!decoder.decode(WTF::get<String>(keyData.m_value)))
return std::nullopt;
break;
case KeyType::Date:
case KeyType::Number:
keyData.m_value = 0.0;
if (!decoder.decode(WTF::get<double>(keyData.m_value)))
return std::nullopt;
break;
}
return WTFMove(keyData);
}
using IDBKeyDataSet = std::set<IDBKeyData, std::less<IDBKeyData>, FastAllocator<IDBKeyData>>;
} // namespace WebCore
#endif // ENABLE(INDEXED_DATABASE)