1/*
2 * Copyright (C) 2013 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 ScriptPromise_h
32#define ScriptPromise_h
33
34#include "bindings/v8/ScopedPersistent.h"
35#include "bindings/v8/ScriptValue.h"
36#include "bindings/v8/V8ScriptRunner.h"
37#include <v8.h>
38
39namespace WebCore {
40
41class ExecutionContext;
42
43// ScriptPromise is the class for representing Promise values in C++ world.
44// ScriptPromise holds a Promise.
45// So holding a ScriptPromise as a member variable in DOM object causes
46// memory leaks since it has a reference from C++ to V8.
47//
48class ScriptPromise {
49public:
50    // Constructs an empty promise.
51    ScriptPromise()
52        : m_promise()
53    {
54    }
55
56    explicit ScriptPromise(const ScriptValue& promise)
57        : m_promise(promise)
58    {
59        ASSERT(!m_promise.hasNoValue());
60    }
61
62    ScriptPromise(v8::Handle<v8::Value> promise, v8::Isolate* isolate)
63        : m_promise(promise, isolate)
64    {
65        ASSERT(!m_promise.hasNoValue());
66    }
67
68    bool isObject() const
69    {
70        return m_promise.isObject();
71    }
72
73    bool isNull() const
74    {
75        return m_promise.isNull();
76    }
77
78    bool isUndefinedOrNull() const
79    {
80        return m_promise.isUndefined() || m_promise.isNull();
81    }
82
83    v8::Handle<v8::Value> v8Value() const
84    {
85        return m_promise.v8Value();
86    }
87
88    v8::Isolate* isolate() const
89    {
90        return m_promise.isolate();
91    }
92
93    bool hasNoValue() const
94    {
95        return m_promise.hasNoValue();
96    }
97
98    void clear()
99    {
100        m_promise.clear();
101    }
102
103    static ScriptPromise createPending();
104    static ScriptPromise createPending(ExecutionContext*);
105
106private:
107    ScriptValue m_promise;
108};
109
110} // namespace WebCore
111
112
113#endif // ScriptPromise_h
114