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 "V8CustomEventListener.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: findWrapper(v8::Local<v8::Value> value,bool isAttribute)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 clearWrapper(v8::Handle<v8::Object> listenerObject,bool isAttribute)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: doFindWrapper(v8::Local<v8::Object> object,v8::Handle<v8::String> wrapperProperty)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 getHiddenProperty(bool isAttribute)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> findOrCreateWrapper(v8::Local<v8::Value> value,bool isAttribute)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