xref: /external/chromium_org/third_party/WebKit/Source/core/dom/custom/CustomElementCallbackQueue.cpp

/*
 * Copyright (C) 2013 Google Inc. All rights reserved.
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 * 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.
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 *    may be used to endorse or promote products derived from this
 *    software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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#include "config.h"
#include "core/dom/custom/CustomElementCallbackQueue.h"

namespace blink {

PassOwnPtrWillBeRawPtr<CustomElementCallbackQueue> CustomElementCallbackQueue::create(PassRefPtrWillBeRawPtr<Element> element)
{
    return adoptPtrWillBeNoop(new CustomElementCallbackQueue(element));
}

CustomElementCallbackQueue::CustomElementCallbackQueue(PassRefPtrWillBeRawPtr<Element> element)
    : m_element(element)
    , m_owner(-1)
    , m_index(0)
    , m_inCreatedCallback(false)
{
}

bool CustomElementCallbackQueue::processInElementQueue(ElementQueueId caller)
{
    ASSERT(!m_inCreatedCallback);
    bool didWork = false;

    while (m_index < m_queue.size() && owner() == caller) {
        m_inCreatedCallback = m_queue[m_index]->isCreatedCallback();

        // dispatch() may cause recursion which steals this callback
        // queue and reenters processInQueue. owner() == caller
        // detects this recursion and cedes processing.
        m_queue[m_index++]->dispatch(m_element.get());
        m_inCreatedCallback = false;
        didWork = true;
    }

    if (owner() == caller && m_index == m_queue.size()) {
        // This processInQueue exhausted the queue; shrink it.
        m_index = 0;
        m_queue.resize(0);
        m_owner = -1;
    }

    return didWork;
}

void CustomElementCallbackQueue::trace(Visitor* visitor)
{
    visitor->trace(m_element);
}

} // namespace blink