Source/WebCore/svg/properties/SVGPointerMemberAccessor.h

/*
 * Copyright (C) 2018-2019 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. ``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
 * 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
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#pragma once

#include "SVGMemberAccessor.h"

namespace WebCore {

template<typename OwnerType, typename PropertyType>
class SVGPointerMemberAccessor : public SVGMemberAccessor<OwnerType> {
    using Base = SVGMemberAccessor<OwnerType>;

public:
    SVGPointerMemberAccessor(Ref<PropertyType> OwnerType::*property)
        : m_property(property)
    {
    }

    Ref<PropertyType>& property(OwnerType& owner) const { return owner.*m_property; }
    const Ref<PropertyType>& property(const OwnerType& owner) const { return owner.*m_property; }

    void detach(const OwnerType& owner) const override
    {
        property(owner)->detach();
    }

    Optional<String> synchronize(const OwnerType& owner) const override
    {
        return property(owner)->synchronize();
    }

protected:
    template<typename AccessorType, Ref<PropertyType> OwnerType::*property>
    static const SVGMemberAccessor<OwnerType>& singleton()
    {
        static NeverDestroyed<AccessorType> propertyAccessor { property };
        return propertyAccessor;
    }

    Ref<PropertyType> OwnerType::*m_property;
};

}