Source/WebKit/WebProcess/InjectedBundle/DOM/InjectedBundleCSSStyleDeclarationHandle.cpp

/*
 * 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.
 */

#include "config.h"
#include "InjectedBundleCSSStyleDeclarationHandle.h"

#include <WebCore/CSSStyleDeclaration.h>
#include <wtf/HashMap.h>
#include <wtf/NeverDestroyed.h>

namespace WebKit {
using namespace WebCore;

typedef HashMap<CSSStyleDeclaration*, InjectedBundleCSSStyleDeclarationHandle*> DOMStyleDeclarationHandleCache;

static DOMStyleDeclarationHandleCache& domStyleDeclarationHandleCache()
{
    static NeverDestroyed<DOMStyleDeclarationHandleCache> cache;
    return cache;
}

RefPtr<InjectedBundleCSSStyleDeclarationHandle> InjectedBundleCSSStyleDeclarationHandle::getOrCreate(CSSStyleDeclaration* styleDeclaration)
{
    if (!styleDeclaration)
        return nullptr;

    DOMStyleDeclarationHandleCache::AddResult result = domStyleDeclarationHandleCache().add(styleDeclaration, nullptr);
    if (!result.isNewEntry)
        return result.iterator->value;

    auto styleDeclarationHandle = adoptRef(*new InjectedBundleCSSStyleDeclarationHandle(*styleDeclaration));
    result.iterator->value = styleDeclarationHandle.ptr();
    return styleDeclarationHandle;
}

InjectedBundleCSSStyleDeclarationHandle::InjectedBundleCSSStyleDeclarationHandle(CSSStyleDeclaration& styleDeclaration)
    : m_styleDeclaration(styleDeclaration)
{
}

InjectedBundleCSSStyleDeclarationHandle::~InjectedBundleCSSStyleDeclarationHandle()
{
    domStyleDeclarationHandleCache().remove(m_styleDeclaration.ptr());
}

} // namespace WebKit