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/*
* Copyright (C) 2009 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef V8EventListenerList_h
#define V8EventListenerList_h
#include "bindings/v8/V8EventListener.h"
#include "bindings/v8/V8HiddenPropertyName.h"
#include <v8.h>
#include "wtf/PassRefPtr.h"
namespace WebCore {
class Frame;
enum ListenerLookupType {
ListenerFindOnly,
ListenerFindOrCreate,
};
// This is a container for V8EventListener objects that uses hidden properties of v8::Object to speed up lookups.
class V8EventListenerList {
public:
static PassRefPtr<V8EventListener> findWrapper(v8::Local<v8::Value> value, v8::Isolate* isolate)
{
ASSERT(v8::Context::InContext());
if (!value->IsObject())
return 0;
v8::Handle<v8::String> wrapperProperty = getHiddenProperty(false, isolate);
return doFindWrapper(v8::Local<v8::Object>::Cast(value), wrapperProperty, isolate);
}
template<typename WrapperType>
static PassRefPtr<V8EventListener> findOrCreateWrapper(v8::Local<v8::Value>, bool isAttribute, v8::Isolate*);
static void clearWrapper(v8::Handle<v8::Object> listenerObject, bool isAttribute, v8::Isolate* isolate)
{
v8::Handle<v8::String> wrapperProperty = getHiddenProperty(isAttribute, isolate);
listenerObject->DeleteHiddenValue(wrapperProperty);
}
static PassRefPtr<EventListener> getEventListener(v8::Local<v8::Value>, bool isAttribute, ListenerLookupType);
private:
static V8EventListener* doFindWrapper(v8::Local<v8::Object> object, v8::Handle<v8::String> wrapperProperty, v8::Isolate* isolate)
{
ASSERT(v8::Context::InContext());
v8::HandleScope scope(isolate);
v8::Local<v8::Value> listener = object->GetHiddenValue(wrapperProperty);
if (listener.IsEmpty())
return 0;
return static_cast<V8EventListener*>(v8::External::Cast(*listener)->Value());
}
static inline v8::Handle<v8::String> getHiddenProperty(bool isAttribute, v8::Isolate* isolate)
{
return isAttribute ? V8HiddenPropertyName::attributeListener(isolate) : V8HiddenPropertyName::listener(isolate);
}
};
template<typename WrapperType>
PassRefPtr<V8EventListener> V8EventListenerList::findOrCreateWrapper(v8::Local<v8::Value> value, bool isAttribute, v8::Isolate* isolate)
{
ASSERT(v8::Context::InContext());
if (!value->IsObject()
// Non-callable attribute setter input is treated as null (no wrapper)
|| (isAttribute && !value->IsFunction()))
return 0;
v8::Local<v8::Object> object = v8::Local<v8::Object>::Cast(value);
v8::Handle<v8::String> wrapperProperty = getHiddenProperty(isAttribute, isolate);
V8EventListener* wrapper = doFindWrapper(object, wrapperProperty, isolate);
if (wrapper)
return wrapper;
RefPtr<V8EventListener> wrapperPtr = WrapperType::create(object, isAttribute, isolate);
if (wrapperPtr)
object->SetHiddenValue(wrapperProperty, v8::External::New(wrapperPtr.get()));
return wrapperPtr;
}
} // namespace WebCore
#endif // V8EventListenerList_h