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      1 /*
      2  * Copyright (C) 2013 Google 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  *
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer
     12  *    in the documentation and/or other materials provided with the
     13  *    distribution.
     14  * 3. Neither the name of Google Inc. nor the names of its contributors
     15  *    may be used to endorse or promote products derived from this
     16  *    software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #include "config.h"
     32 #include "core/dom/custom/CustomElementCallbackQueue.h"
     33 
     34 namespace WebCore {
     35 
     36 PassOwnPtrWillBeRawPtr<CustomElementCallbackQueue> CustomElementCallbackQueue::create(PassRefPtrWillBeRawPtr<Element> element)
     37 {
     38     return adoptPtrWillBeNoop(new CustomElementCallbackQueue(element));
     39 }
     40 
     41 CustomElementCallbackQueue::CustomElementCallbackQueue(PassRefPtrWillBeRawPtr<Element> element)
     42     : m_element(element)
     43     , m_owner(-1)
     44     , m_index(0)
     45     , m_inCreatedCallback(false)
     46 {
     47 }
     48 
     49 bool CustomElementCallbackQueue::processInElementQueue(ElementQueueId caller)
     50 {
     51     ASSERT(!m_inCreatedCallback);
     52     bool didWork = false;
     53 
     54     while (m_index < m_queue.size() && owner() == caller) {
     55         m_inCreatedCallback = m_queue[m_index]->isCreated();
     56 
     57         // dispatch() may cause recursion which steals this callback
     58         // queue and reenters processInQueue. owner() == caller
     59         // detects this recursion and cedes processing.
     60         m_queue[m_index++]->dispatch(m_element.get());
     61         m_inCreatedCallback = false;
     62         didWork = true;
     63     }
     64 
     65     if (owner() == caller && m_index == m_queue.size()) {
     66         // This processInQueue exhausted the queue; shrink it.
     67         m_index = 0;
     68         m_queue.resize(0);
     69         m_owner = -1;
     70     }
     71 
     72     return didWork;
     73 }
     74 
     75 void CustomElementCallbackQueue::trace(Visitor* visitor)
     76 {
     77     visitor->trace(m_element);
     78 }
     79 
     80 } // namespace WebCore
     81