1/*
2 * Copyright (C) 2010 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 WrapperTypeInfo_h
32#define WrapperTypeInfo_h
33
34#include <v8.h>
35
36namespace WebCore {
37
38    class ActiveDOMObject;
39
40    static const int v8DOMWrapperTypeIndex = 0;
41    static const int v8DOMWrapperObjectIndex = 1;
42    static const int v8DOMHiddenReferenceArrayIndex = 2;
43    static const int v8DefaultWrapperInternalFieldCount = 3;
44
45    static const uint16_t v8DOMSubtreeClassId = 1;
46
47    typedef v8::Persistent<v8::FunctionTemplate> (*GetTemplateFunction)();
48    typedef void (*DerefObjectFunction)(void*);
49    typedef ActiveDOMObject* (*ToActiveDOMObjectFunction)(v8::Handle<v8::Object>);
50
51    // This struct provides a way to store a bunch of information that is helpful when unwrapping
52    // v8 objects. Each v8 bindings class has exactly one static WrapperTypeInfo member, so
53    // comparing pointers is a safe way to determine if types match.
54    struct WrapperTypeInfo {
55
56        static WrapperTypeInfo* unwrap(v8::Handle<v8::Value> typeInfoWrapper)
57        {
58            return reinterpret_cast<WrapperTypeInfo*>(v8::External::Unwrap(typeInfoWrapper));
59        }
60
61
62        bool equals(const WrapperTypeInfo* that) const
63        {
64            return this == that;
65        }
66
67        bool isSubclass(const WrapperTypeInfo* that) const
68        {
69            for (const WrapperTypeInfo* current = this; current; current = current->parentClass) {
70                if (current == that)
71                    return true;
72            }
73
74            return false;
75        }
76
77        v8::Persistent<v8::FunctionTemplate> getTemplate() { return getTemplateFunction(); }
78
79        void derefObject(void* object)
80        {
81            if (derefObjectFunction)
82                derefObjectFunction(object);
83        }
84
85        ActiveDOMObject* toActiveDOMObject(v8::Handle<v8::Object> object)
86        {
87            if (!toActiveDOMObjectFunction)
88                return 0;
89            return toActiveDOMObjectFunction(object);
90        }
91
92        const GetTemplateFunction getTemplateFunction;
93        const DerefObjectFunction derefObjectFunction;
94        const ToActiveDOMObjectFunction toActiveDOMObjectFunction;
95        const WrapperTypeInfo* parentClass;
96    };
97}
98
99#endif // WrapperTypeInfo_h
100