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 "bindings/v8/V8EventListener.h" 35#include "bindings/v8/V8HiddenPropertyName.h" 36 37#include <v8.h> 38#include "wtf/PassRefPtr.h" 39 40namespace WebCore { 41 42class Frame; 43 44enum ListenerLookupType { 45 ListenerFindOnly, 46 ListenerFindOrCreate, 47}; 48 49// This is a container for V8EventListener objects that uses hidden properties of v8::Object to speed up lookups. 50class V8EventListenerList { 51public: 52 static PassRefPtr<V8EventListener> findWrapper(v8::Local<v8::Value> value, bool isAttribute) 53 { 54 ASSERT(v8::Context::InContext()); 55 if (!value->IsObject()) 56 return 0; 57 58 v8::Handle<v8::String> wrapperProperty = getHiddenProperty(isAttribute); 59 return doFindWrapper(v8::Local<v8::Object>::Cast(value), wrapperProperty); 60 } 61 62 template<typename WrapperType> 63 static PassRefPtr<V8EventListener> findOrCreateWrapper(v8::Local<v8::Value>, bool isAttribute); 64 65 static void clearWrapper(v8::Handle<v8::Object> listenerObject, bool isAttribute) 66 { 67 v8::Handle<v8::String> wrapperProperty = getHiddenProperty(isAttribute); 68 listenerObject->DeleteHiddenValue(wrapperProperty); 69 } 70 71 static PassRefPtr<EventListener> getEventListener(v8::Local<v8::Value>, bool isAttribute, ListenerLookupType); 72 73private: 74 static V8EventListener* doFindWrapper(v8::Local<v8::Object> object, v8::Handle<v8::String> wrapperProperty) 75 { 76 ASSERT(v8::Context::InContext()); 77 v8::HandleScope scope; 78 v8::Local<v8::Value> listener = object->GetHiddenValue(wrapperProperty); 79 if (listener.IsEmpty()) 80 return 0; 81 return static_cast<V8EventListener*>(v8::External::Cast(*listener)->Value()); 82 } 83 84 static inline v8::Handle<v8::String> getHiddenProperty(bool isAttribute) 85 { 86 return isAttribute ? V8HiddenPropertyName::attributeListener() : V8HiddenPropertyName::listener(); 87 } 88}; 89 90template<typename WrapperType> 91PassRefPtr<V8EventListener> V8EventListenerList::findOrCreateWrapper(v8::Local<v8::Value> value, bool isAttribute) 92{ 93 ASSERT(v8::Context::InContext()); 94 if (!value->IsObject()) 95 return 0; 96 97 v8::Local<v8::Object> object = v8::Local<v8::Object>::Cast(value); 98 v8::Handle<v8::String> wrapperProperty = getHiddenProperty(isAttribute); 99 100 V8EventListener* wrapper = doFindWrapper(object, wrapperProperty); 101 if (wrapper) 102 return wrapper; 103 104 RefPtr<V8EventListener> wrapperPtr = WrapperType::create(object, isAttribute); 105 if (wrapperPtr) 106 object->SetHiddenValue(wrapperProperty, v8::External::New(wrapperPtr.get())); 107 108 return wrapperPtr; 109} 110 111} // namespace WebCore 112 113#endif // V8EventListenerList_h 114