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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/CustomElementObserver.h"
     33 
     34 #include "core/dom/Element.h"
     35 
     36 namespace blink {
     37 
     38 // Maps elements to the observer watching them. At most one per
     39 // element at a time.
     40 typedef WillBeHeapHashMap<RawPtrWillBeWeakMember<Element>, RawPtrWillBeMember<CustomElementObserver> > ElementObserverMap;
     41 
     42 static ElementObserverMap& elementObservers()
     43 {
     44     DEFINE_STATIC_LOCAL(OwnPtrWillBePersistent<ElementObserverMap>, map, (adoptPtrWillBeNoop(new ElementObserverMap())));
     45     return *map;
     46 }
     47 
     48 void CustomElementObserver::notifyElementDidFinishParsingChildren(Element* element)
     49 {
     50     ElementObserverMap::iterator it = elementObservers().find(element);
     51     if (it == elementObservers().end())
     52         return;
     53     it->value->elementDidFinishParsingChildren(element);
     54 }
     55 
     56 void CustomElementObserver::notifyElementWasDestroyed(Element* element)
     57 {
     58     ElementObserverMap::iterator it = elementObservers().find(element);
     59     if (it == elementObservers().end())
     60         return;
     61     it->value->elementWasDestroyed(element);
     62 }
     63 
     64 void CustomElementObserver::observe(Element* element)
     65 {
     66     ElementObserverMap::AddResult result = elementObservers().add(element, this);
     67     ASSERT_UNUSED(result, result.isNewEntry);
     68 }
     69 
     70 void CustomElementObserver::unobserve(Element* element)
     71 {
     72     CustomElementObserver* observer = elementObservers().take(element);
     73     ASSERT_UNUSED(observer, observer == this);
     74 }
     75 
     76 } // namespace blink
     77