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/*
* Copyright (C) 2012 Google Inc. All Rights Reserved.
* Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple 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:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 APPLE INC. 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 V8DependentRetained_h
#define V8DependentRetained_h
#include "ScopedPersistent.h"
#include "V8HiddenPropertyName.h"
#include "V8PerIsolateData.h"
#include <v8.h>
#include <wtf/Forward.h>
#include <wtf/UnusedParam.h>
#include <wtf/dtoa.h>
#include <wtf/text/StringBuilder.h>
namespace WebCore {
class V8DependentRetained {
public:
V8DependentRetained(v8::Handle<v8::Object> owner, v8::Handle<v8::Object> value)
: m_value(value)
, m_propertyName(createPropertyName())
{
ASSERT(!m_value.isEmpty());
m_value.get().MakeWeak(this, &V8DependentRetained::weakCallback);
if (!owner.IsEmpty())
retain(owner);
}
~V8DependentRetained()
{
release();
}
v8::Handle<v8::Object> get() const
{
return m_value.get();
}
bool isEmpty() const
{
return m_owner.isEmpty() || m_value.isEmpty();
}
void retain(v8::Handle<v8::Object> owner)
{
ASSERT(m_owner.isEmpty() && !owner.IsEmpty());
ASSERT(!m_value.isEmpty());
owner->SetHiddenValue(m_propertyName.get(), get());
m_owner.set(owner);
m_owner.get().MakeWeak(this, &V8DependentRetained::weakCallback);
}
private:
static v8::Handle<v8::String> createPropertyName()
{
StringBuilder name;
name.appendLiteral("V8DependentRetained");
name.append(String::numberToStringECMAScript(V8PerIsolateData::current()->nextDependentRetainedId()));
return V8HiddenPropertyName::hiddenReferenceName(reinterpret_cast<const char*>(name.characters8()), name.length(), NewString);
}
static void weakCallback(v8::Persistent<v8::Value> object, void* parameter)
{
V8DependentRetained* value = static_cast<V8DependentRetained*>(parameter);
value->release();
}
void release()
{
if (!m_owner.isEmpty())
m_owner->DeleteHiddenValue(m_propertyName.get());
m_value.clear();
m_owner.clear();
m_propertyName.clear();
}
ScopedPersistent<v8::Object> m_owner;
ScopedPersistent<v8::Object> m_value;
ScopedPersistent<v8::String> m_propertyName;
};
} // namespace WebCore
#endif // V8DependentRetained_h
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