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/*
* Copyright (C) 2013 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 IDBIdentifier_h
#define IDBIdentifier_h
#if ENABLE(INDEXED_DATABASE) && ENABLE(DATABASE_PROCESS)
#include <wtf/HashTraits.h>
#include <wtf/StringHasher.h>
namespace WebKit {
class DatabaseProcessIDBConnection;
class IDBIdentifier {
public:
IDBIdentifier()
: m_connection(nullptr)
, m_identifier(0)
{
}
IDBIdentifier(DatabaseProcessIDBConnection& connection, int64_t identifier)
: m_connection(&connection)
, m_identifier(identifier)
{
}
IDBIdentifier isolatedCopy() const
{
return *this;
}
bool isEmpty() const
{
return !m_connection && !m_identifier;
}
unsigned hash() const
{
uint64_t hashCodes[2] = { reinterpret_cast<uint64_t>(m_connection), static_cast<uint64_t>(m_identifier) };
return StringHasher::hashMemory<sizeof(hashCodes)>(hashCodes);
}
bool operator==(const IDBIdentifier& other) const
{
return m_connection == other.m_connection && m_identifier == other.m_identifier;
}
IDBIdentifier(WTF::HashTableDeletedValueType)
: m_connection(nullptr)
, m_identifier(-1)
{
}
bool isHashTableDeletedValue() const
{
return !m_connection && m_identifier == -1;
}
DatabaseProcessIDBConnection& connection() const
{
ASSERT(m_connection);
return *m_connection;
}
int64_t id() const { return m_identifier; }
private:
// If any members are added that cannot be safely copied across threads, isolatedCopy() must be updated.
DatabaseProcessIDBConnection* m_connection;
int64_t m_identifier;
};
struct IDBIdentifierHash {
static unsigned hash(const IDBIdentifier& a) { return a.hash(); }
static bool equal(const IDBIdentifier& a, const IDBIdentifier& b) { return a == b; }
static const bool safeToCompareToEmptyOrDeleted = false;
};
struct IDBIdentifierHashTraits : WTF::SimpleClassHashTraits<IDBIdentifier> {
static const bool hasIsEmptyValueFunction = true;
static bool isEmptyValue(const IDBIdentifier& info) { return info.isEmpty(); }
};
} // namespace WebKit
namespace WTF {
template<> struct HashTraits<WebKit::IDBIdentifier> : WebKit::IDBIdentifierHashTraits { };
template<> struct DefaultHash<WebKit::IDBIdentifier> {
typedef WebKit::IDBIdentifierHash Hash;
};
} // namespace WTF
#endif // ENABLE(INDEXED_DATABASE) && ENABLE(DATABASE_PROCESS)
#endif // IDBIdentifier_h
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