Source/WebCore/Modules/indexeddb/IDBGetResult.h

/*
 * 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 "IDBKeyData.h"
#include "IDBKeyPath.h"
#include "IDBValue.h"
#include "SharedBuffer.h"

namespace WebCore {

class IDBGetResult {
    WTF_MAKE_FAST_ALLOCATED;
public:
    IDBGetResult()
        : m_isDefined(false)
    {
    }

    IDBGetResult(const IDBKeyData& keyData)
        : m_keyData(keyData)
    {
    }

    IDBGetResult(const IDBKeyData& keyData, const IDBKeyData& primaryKeyData)
        : m_keyData(keyData)
        , m_primaryKeyData(primaryKeyData)
    {
    }

    IDBGetResult(const IDBKeyData& keyData, const ThreadSafeDataBuffer& buffer, const Optional<IDBKeyPath>& keyPath)
        : m_value(buffer)
        , m_keyData(keyData)
        , m_keyPath(keyPath)
    {
    }

    IDBGetResult(const IDBKeyData& keyData, IDBValue&& value, const Optional<IDBKeyPath>& keyPath)
        : m_value(WTFMove(value))
        , m_keyData(keyData)
        , m_keyPath(keyPath)
    {
    }

    IDBGetResult(const IDBKeyData& keyData, const IDBKeyData& primaryKeyData, IDBValue&& value, const Optional<IDBKeyPath>& keyPath)
        : m_value(WTFMove(value))
        , m_keyData(keyData)
        , m_primaryKeyData(primaryKeyData)
        , m_keyPath(keyPath)
    {
    }

    enum IsolatedCopyTag { IsolatedCopy };
    IDBGetResult(const IDBGetResult&, IsolatedCopyTag);

    IDBGetResult isolatedCopy() const;

    void setValue(IDBValue&&);

    const IDBValue& value() const { return m_value; }
    const IDBKeyData& keyData() const { return m_keyData; }
    const IDBKeyData& primaryKeyData() const { return m_primaryKeyData; }
    const Optional<IDBKeyPath>& keyPath() const { return m_keyPath; }
    bool isDefined() const { return m_isDefined; }

    template<class Encoder> void encode(Encoder&) const;
    template<class Decoder> static bool decode(Decoder&, IDBGetResult&);

private:
    void dataFromBuffer(SharedBuffer&);

    static void isolatedCopy(const IDBGetResult& source, IDBGetResult& destination);

    IDBValue m_value;
    IDBKeyData m_keyData;
    IDBKeyData m_primaryKeyData;
    Optional<IDBKeyPath> m_keyPath;
    bool m_isDefined { true };
};

template<class Encoder>
void IDBGetResult::encode(Encoder& encoder) const
{
    encoder << m_keyData << m_primaryKeyData << m_keyPath << m_isDefined << m_value;
}

template<class Decoder>
bool IDBGetResult::decode(Decoder& decoder, IDBGetResult& result)
{
    Optional<IDBKeyData> keyData;
    decoder >> keyData;
    if (!keyData)
        return false;
    result.m_keyData = WTFMove(*keyData);

    Optional<IDBKeyData> primaryKeyData;
    decoder >> primaryKeyData;
    if (!primaryKeyData)
        return false;
    result.m_primaryKeyData = WTFMove(*primaryKeyData);

    if (!decoder.decode(result.m_keyPath))
        return false;

    if (!decoder.decode(result.m_isDefined))
        return false;

    Optional<IDBValue> value;
    decoder >> value;
    if (!value)
        return false;
    result.m_value = WTFMove(*value);

    return true;
}

} // namespace WebCore

#endif // ENABLE(INDEXED_DATABASE)