/*

 * 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

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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

#ifndef SharedPersistent_h

#define SharedPersistent_h

#include <v8.h>

#include <wtf/PassRefPtr.h>

#include <wtf/RefCounted.h>

namespace WebCore {

    // A shareable reference to a v8 persistent handle.  Using a shared

    // persistent any number of objects can share a reference to a v8

    // object and when it should no longer be accessible the object's

    // owner can clear it.

    template <typename T>

    class SharedPersistent : public RefCounted<SharedPersistent<T> > {

    public:

        void set(v8::Persistent<T> value)

        {

            m_value = value;

        }

        v8::Persistent<T> get()

        {

            return m_value;

        }

        void disposeHandle()

        {

            if (!m_value.IsEmpty()) {

              m_value.Dispose();

              m_value.Clear();

            }

        }

        static PassRefPtr<SharedPersistent<T> > create(v8::Persistent<T> value)

        {

            return adoptRef(new SharedPersistent<T>(value));

        }

        static PassRefPtr<SharedPersistent<T> > create()

        {

            return create(v8::Persistent<T>());

        }

    private:

        explicit SharedPersistent(v8::Persistent<T> value) : m_value(value) { }

        v8::Persistent<T> m_value;

    };

} // namespace WebCore

#endif // SharedPersistent_h