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/*
* Copyright (C) 2015 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.
*/
#ifndef IDBResourceIdentifier_h
#define IDBResourceIdentifier_h
#if ENABLE(INDEXED_DATABASE)
#include <wtf/text/StringHash.h>
namespace WebCore {
namespace IDBClient {
class IDBConnectionToServer;
class IDBRequest;
}
namespace IDBServer {
class IDBConnectionToClient;
}
class IDBResourceIdentifier {
public:
explicit IDBResourceIdentifier(const IDBClient::IDBConnectionToServer&);
IDBResourceIdentifier(const IDBClient::IDBConnectionToServer&, const IDBClient::IDBRequest&);
explicit IDBResourceIdentifier(const IDBServer::IDBConnectionToClient&);
static IDBResourceIdentifier deletedValue();
WEBCORE_EXPORT bool isHashTableDeletedValue() const;
static IDBResourceIdentifier emptyValue();
bool isEmpty() const
{
return !m_resourceNumber && !m_idbConnectionIdentifier;
}
unsigned hash() const
{
uint64_t hashCodes[2] = { m_idbConnectionIdentifier, m_resourceNumber };
return StringHasher::hashMemory<sizeof(hashCodes)>(hashCodes);
}
bool operator==(const IDBResourceIdentifier& other) const
{
return m_idbConnectionIdentifier == other.m_idbConnectionIdentifier
&& m_resourceNumber == other.m_resourceNumber;
}
uint64_t connectionIdentifier() const { return m_idbConnectionIdentifier; }
IDBResourceIdentifier isolatedCopy() const;
#ifndef NDEBUG
String loggingString() const;
#endif
WEBCORE_EXPORT IDBResourceIdentifier();
template<class Encoder> void encode(Encoder&) const;
template<class Decoder> static bool decode(Decoder&, IDBResourceIdentifier&);
private:
IDBResourceIdentifier(uint64_t connectionIdentifier, uint64_t resourceIdentifier);
uint64_t m_idbConnectionIdentifier { 0 };
uint64_t m_resourceNumber { 0 };
};
struct IDBResourceIdentifierHash {
static unsigned hash(const IDBResourceIdentifier& a) { return a.hash(); }
static bool equal(const IDBResourceIdentifier& a, const IDBResourceIdentifier& b) { return a == b; }
static const bool safeToCompareToEmptyOrDeleted = false;
};
struct IDBResourceIdentifierHashTraits : WTF::CustomHashTraits<IDBResourceIdentifier> {
static const bool hasIsEmptyValueFunction = true;
static const bool emptyValueIsZero = false;
static IDBResourceIdentifier emptyValue()
{
return IDBResourceIdentifier::emptyValue();
}
static bool isEmptyValue(const IDBResourceIdentifier& identifier)
{
return identifier.isEmpty();
}
static void constructDeletedValue(IDBResourceIdentifier& identifier)
{
identifier = IDBResourceIdentifier::deletedValue();
}
static bool isDeletedValue(const IDBResourceIdentifier& identifier)
{
return identifier.isHashTableDeletedValue();
}
};
template<class Encoder>
void IDBResourceIdentifier::encode(Encoder& encoder) const
{
encoder << m_idbConnectionIdentifier << m_resourceNumber;
}
template<class Decoder>
bool IDBResourceIdentifier::decode(Decoder& decoder, IDBResourceIdentifier& identifier)
{
if (!decoder.decode(identifier.m_idbConnectionIdentifier))
return false;
if (!decoder.decode(identifier.m_resourceNumber))
return false;
return true;
}
} // namespace WebCore
namespace WTF {
template<> struct HashTraits<WebCore::IDBResourceIdentifier> : WebCore::IDBResourceIdentifierHashTraits { };
template<> struct DefaultHash<WebCore::IDBResourceIdentifier> {
typedef WebCore::IDBResourceIdentifierHash Hash;
};
} // namespace WTF
#endif // ENABLE(INDEXED_DATABASE)
#endif // IDBResourceIdentifier_h
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