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      1 /*
      2  * Copyright (C) 2009 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 are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this 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 V8EventListenerList_h
     32 #define V8EventListenerList_h
     33 
     34 #include "V8EventListener.h"
     35 #include "V8HiddenPropertyName.h"
     36 
     37 #include <v8.h>
     38 #include <wtf/PassRefPtr.h>
     39 
     40 namespace WebCore {
     41     class Frame;
     42 
     43     // This is a container for V8EventListener objects that uses hidden properties of v8::Object to speed up lookups.
     44     class V8EventListenerList {
     45     public:
     46         static PassRefPtr<V8EventListener> findWrapper(v8::Local<v8::Value> value, bool isAttribute)
     47         {
     48             ASSERT(v8::Context::InContext());
     49             if (!value->IsObject())
     50                 return 0;
     51 
     52             v8::Handle<v8::String> wrapperProperty = getHiddenProperty(isAttribute);
     53             return doFindWrapper(v8::Local<v8::Object>::Cast(value), wrapperProperty);
     54         }
     55 
     56         template<typename WrapperType>
     57         static PassRefPtr<V8EventListener> findOrCreateWrapper(v8::Local<v8::Value>, bool isAttribute);
     58 
     59         static void clearWrapper(v8::Handle<v8::Object> listenerObject, bool isAttribute)
     60         {
     61             v8::Handle<v8::String> wrapperProperty = getHiddenProperty(isAttribute);
     62             listenerObject->DeleteHiddenValue(wrapperProperty);
     63         }
     64 
     65     private:
     66         static V8EventListener* doFindWrapper(v8::Local<v8::Object> object, v8::Handle<v8::String> wrapperProperty)
     67         {
     68             ASSERT(v8::Context::InContext());
     69             v8::HandleScope scope;
     70             v8::Local<v8::Value> listener = object->GetHiddenValue(wrapperProperty);
     71             if (listener.IsEmpty())
     72                 return 0;
     73             return static_cast<V8EventListener*>(v8::External::Unwrap(listener));
     74         }
     75 
     76         static inline v8::Handle<v8::String> getHiddenProperty(bool isAttribute)
     77         {
     78             return isAttribute ? V8HiddenPropertyName::attributeListener() : V8HiddenPropertyName::listener();
     79         }
     80     };
     81 
     82     template<typename WrapperType>
     83     PassRefPtr<V8EventListener> V8EventListenerList::findOrCreateWrapper(v8::Local<v8::Value> value, bool isAttribute)
     84     {
     85         ASSERT(v8::Context::InContext());
     86         if (!value->IsObject())
     87             return 0;
     88 
     89         v8::Local<v8::Object> object = v8::Local<v8::Object>::Cast(value);
     90         v8::Handle<v8::String> wrapperProperty = getHiddenProperty(isAttribute);
     91 
     92         V8EventListener* wrapper = doFindWrapper(object, wrapperProperty);
     93         if (wrapper)
     94             return wrapper;
     95 
     96         PassRefPtr<V8EventListener> wrapperPtr = WrapperType::create(object, isAttribute, WorldContextHandle(UseCurrentWorld));
     97         if (wrapperPtr)
     98             object->SetHiddenValue(wrapperProperty, v8::External::Wrap(wrapperPtr.get()));
     99 
    100         return wrapperPtr;
    101     }
    102 
    103 } // namespace WebCore
    104 
    105 #endif // V8EventListenerList_h
    106