1/*
2 * Copyright (C) 2009 Google Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are
6 * met:
7 *
8 *     * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 *     * Redistributions in binary form must reproduce the above
11 * copyright notice, this list of conditions and the following disclaimer
12 * in the documentation and/or other materials provided with the
13 * distribution.
14 *     * Neither the name of Google Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#ifndef SharedPersistent_h
32#define SharedPersistent_h
33
34#include "bindings/core/v8/ScopedPersistent.h"
35#include "wtf/PassRefPtr.h"
36#include "wtf/RefCounted.h"
37#include <v8.h>
38
39namespace blink {
40
41template <typename T>
42class SharedPersistent : public RefCounted<SharedPersistent<T> > {
43WTF_MAKE_NONCOPYABLE(SharedPersistent);
44public:
45    static PassRefPtr<SharedPersistent<T> > create(v8::Handle<T> value, v8::Isolate* isolate)
46    {
47        return adoptRef(new SharedPersistent<T>(value, isolate));
48    }
49
50    v8::Local<T> newLocal(v8::Isolate* isolate) const
51    {
52        return m_value.newLocal(isolate);
53    }
54
55    bool isEmpty() { return m_value.isEmpty(); }
56
57    bool operator==(const SharedPersistent<T>& other)
58    {
59        return m_value == other.m_value;
60    }
61
62private:
63    explicit SharedPersistent(v8::Handle<T> value, v8::Isolate* isolate) : m_value(isolate, value) { }
64    ScopedPersistent<T> m_value;
65};
66
67} // namespace blink
68
69#endif // SharedPersistent_h
70