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/*
* Copyright (C) 2012 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 DOMWrapperMap_h
#define DOMWrapperMap_h
#include "bindings/v8/UnsafePersistent.h"
#include "bindings/v8/V8Utilities.h"
#include "bindings/v8/WrapperTypeInfo.h"
#include <v8.h>
#include "wtf/HashMap.h"
namespace WebCore {
template<class KeyType>
class DOMWrapperMap {
public:
typedef HashMap<KeyType*, UnsafePersistent<v8::Object> > MapType;
explicit DOMWrapperMap(v8::Isolate* isolate)
: m_isolate(isolate)
{
}
v8::Handle<v8::Object> newLocal(KeyType* key, v8::Isolate* isolate)
{
return m_map.get(key).newLocal(isolate);
}
bool setReturnValueFrom(v8::ReturnValue<v8::Value> returnValue, KeyType* key)
{
typename MapType::iterator it = m_map.find(key);
if (it == m_map.end())
return false;
returnValue.Set(*(it->value.persistent()));
return true;
}
bool containsKey(KeyType* key)
{
return m_map.find(key) != m_map.end();
}
bool containsKeyAndValue(KeyType* key, const v8::Persistent<v8::Object>& value)
{
typename MapType::iterator it = m_map.find(key);
if (it == m_map.end())
return false;
return *(it->value.persistent()) == value;
}
void set(KeyType* key, v8::Handle<v8::Object> wrapper, const WrapperConfiguration& configuration)
{
ASSERT(static_cast<KeyType*>(toNative(wrapper)) == key);
v8::Persistent<v8::Object> persistent(m_isolate, wrapper);
configuration.configureWrapper(&persistent);
persistent.MakeWeak(this, &makeWeakCallback);
typename MapType::AddResult result = m_map.add(key, UnsafePersistent<v8::Object>());
ASSERT(result.isNewEntry);
// FIXME: Stop handling this case once duplicate wrappers are guaranteed not to be created.
if (!result.isNewEntry)
result.iterator->value.dispose();
result.iterator->value = UnsafePersistent<v8::Object>(persistent);
}
void clear()
{
while (!m_map.isEmpty()) {
// Swap out m_map on each iteration to ensure any wrappers added due to side effects of the loop are cleared.
MapType map;
map.swap(m_map);
for (typename MapType::iterator it = map.begin(); it != map.end(); ++it) {
toWrapperTypeInfo(*(it->value.persistent()))->derefObject(it->key);
it->value.dispose();
}
}
}
void removeAndDispose(KeyType* key)
{
typename MapType::iterator it = m_map.find(key);
ASSERT(it != m_map.end());
it->value.dispose();
m_map.remove(it);
}
private:
static void makeWeakCallback(v8::Isolate*, v8::Persistent<v8::Object>* wrapper, DOMWrapperMap<KeyType>*);
v8::Isolate* m_isolate;
MapType m_map;
};
template<>
inline void DOMWrapperMap<void>::makeWeakCallback(v8::Isolate* isolate, v8::Persistent<v8::Object>* wrapper, DOMWrapperMap<void>* map)
{
const WrapperTypeInfo* type = toWrapperTypeInfo(*wrapper);
ASSERT(type->derefObjectFunction);
void* key = static_cast<void*>(toNative(*wrapper));
ASSERT(*(map->m_map.get(key).persistent()) == *wrapper);
map->removeAndDispose(key);
type->derefObject(key);
}
} // namespace WebCore
#endif // DOMWrapperMap_h