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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 #ifndef CustomElementObserver_h |  | 
| 32 #define CustomElementObserver_h |  | 
| 33 |  | 
| 34 #include "wtf/HashMap.h" |  | 
| 35 |  | 
| 36 namespace WebCore { |  | 
| 37 |  | 
| 38 class Element; |  | 
| 39 |  | 
| 40 class CustomElementObserver { |  | 
| 41 public: |  | 
| 42     CustomElementObserver() { } |  | 
| 43     virtual ~CustomElementObserver() { } |  | 
| 44 |  | 
| 45     // API for CustomElement to kick off notifications |  | 
| 46 |  | 
| 47     static void notifyElementDidFinishParsingChildren(Element*); |  | 
| 48     static void notifyElementWasDestroyed(Element*); |  | 
| 49 |  | 
| 50 protected: |  | 
| 51     void observe(Element*); |  | 
| 52     void unobserve(Element*); |  | 
| 53 |  | 
| 54     virtual void elementDidFinishParsingChildren(Element*) = 0; |  | 
| 55     virtual void elementWasDestroyed(Element* element) { unobserve(element); } |  | 
| 56 |  | 
| 57 private: |  | 
| 58     // Maps elements to the observer watching them. At most one per |  | 
| 59     // element at a time. |  | 
| 60     typedef HashMap<Element*, CustomElementObserver*> ElementObserverMap; |  | 
| 61     static ElementObserverMap& elementObservers(); |  | 
| 62 }; |  | 
| 63 |  | 
| 64 } |  | 
| 65 |  | 
| 66 #endif // CustomElementObserver_h |  | 
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