1/* 2 * Copyright (C) 2013 Apple Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' 14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS 17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 23 * THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26#ifndef IDBIdentifier_h 27#define IDBIdentifier_h 28 29#if ENABLE(INDEXED_DATABASE) && ENABLE(DATABASE_PROCESS) 30 31#include <wtf/HashTraits.h> 32#include <wtf/StringHasher.h> 33 34namespace WebKit { 35 36class DatabaseProcessIDBConnection; 37 38class IDBIdentifier { 39public: 40 IDBIdentifier() 41 : m_connection(nullptr) 42 , m_identifier(0) 43 { 44 } 45 46 IDBIdentifier(DatabaseProcessIDBConnection& connection, int64_t identifier) 47 : m_connection(&connection) 48 , m_identifier(identifier) 49 { 50 } 51 52 IDBIdentifier isolatedCopy() const 53 { 54 return *this; 55 } 56 57 bool isEmpty() const 58 { 59 return !m_connection && !m_identifier; 60 } 61 62 unsigned hash() const 63 { 64 uint64_t hashCodes[2] = { reinterpret_cast<uint64_t>(m_connection), static_cast<uint64_t>(m_identifier) }; 65 return StringHasher::hashMemory<sizeof(hashCodes)>(hashCodes); 66 } 67 68 bool operator==(const IDBIdentifier& other) const 69 { 70 return m_connection == other.m_connection && m_identifier == other.m_identifier; 71 } 72 73 IDBIdentifier(WTF::HashTableDeletedValueType) 74 : m_connection(nullptr) 75 , m_identifier(-1) 76 { 77 } 78 79 bool isHashTableDeletedValue() const 80 { 81 return !m_connection && m_identifier == -1; 82 } 83 84 DatabaseProcessIDBConnection& connection() const 85 { 86 ASSERT(m_connection); 87 return *m_connection; 88 } 89 90 int64_t id() const { return m_identifier; } 91 92private: 93 // If any members are added that cannot be safely copied across threads, isolatedCopy() must be updated. 94 DatabaseProcessIDBConnection* m_connection; 95 int64_t m_identifier; 96}; 97 98struct IDBIdentifierHash { 99 static unsigned hash(const IDBIdentifier& a) { return a.hash(); } 100 static bool equal(const IDBIdentifier& a, const IDBIdentifier& b) { return a == b; } 101 static const bool safeToCompareToEmptyOrDeleted = false; 102}; 103 104struct IDBIdentifierHashTraits : WTF::SimpleClassHashTraits<IDBIdentifier> { 105 static const bool hasIsEmptyValueFunction = true; 106 static bool isEmptyValue(const IDBIdentifier& info) { return info.isEmpty(); } 107}; 108 109} // namespace WebKit 110 111namespace WTF { 112 113template<> struct HashTraits<WebKit::IDBIdentifier> : WebKit::IDBIdentifierHashTraits { }; 114template<> struct DefaultHash<WebKit::IDBIdentifier> { 115 typedef WebKit::IDBIdentifierHash Hash; 116}; 117 118} // namespace WTF 119 120#endif // ENABLE(INDEXED_DATABASE) && ENABLE(DATABASE_PROCESS) 121#endif // IDBIdentifier_h 122