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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 JSDependentRetained_h
#define JSDependentRetained_h
#include "JSDOMGlobalObject.h"
#include <heap/Weak.h>
#include <runtime/JSObject.h>
#include <runtime/PrivateName.h>
#include <wtf/Forward.h>
namespace WebCore {
class JSDependentRetained {
public:
JSDependentRetained(JSC::JSObject* owner, JSC::JSObject* value, JSDOMGlobalObject* globalObject)
: m_value(value)
, m_globalObject(globalObject)
{
ASSERT(value);
if (owner)
retain(owner);
}
~JSDependentRetained()
{
release();
}
JSC::JSObject* get() const
{
return m_value.get();
}
bool isEmpty() const
{
return !m_owner || !m_value;
}
void retain(JSC::JSObject* owner)
{
ASSERT(!m_owner && owner);
ASSERT(m_value);
m_owner = JSC::PassWeak<JSC::JSObject>(owner);
m_owner->putDirect(m_globalObject->globalData(), m_propertyName, get());
}
private:
void release()
{
if (m_owner)
m_owner->removeDirect(m_globalObject->globalData(), m_propertyName);
m_value.clear();
m_owner.clear();
}
JSC::Weak<JSC::JSObject> m_owner;
JSC::Weak<JSC::JSObject> m_value;
JSC::PrivateName m_propertyName;
JSC::Weak<JSDOMGlobalObject> m_globalObject;
};
} // namespace WebCore
#endif // JSDependentRetained_h
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