1/*
2 * Copyright (C) 2012 Intel Corporation. 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
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#ifndef ewk_object_private_h
27#define ewk_object_private_h
28
29#include <wtf/RefCounted.h>
30
31class EwkObject : public RefCounted<EwkObject> {
32public:
33    virtual ~EwkObject() { }
34    virtual const char* instanceClassName() const = 0;
35};
36
37template <class T>
38inline bool ewk_object_is_of_type(const EwkObject* object)
39{
40    return (reinterpret_cast<T>(0)->className() == object->instanceClassName());
41}
42
43template <class T>
44inline bool ewk_object_cast_check(const EwkObject* object)
45{
46    EINA_SAFETY_ON_NULL_RETURN_VAL(object, false);
47
48    if (!ewk_object_is_of_type<T>(object)) {
49        EINA_LOG_CRIT("attempt to convert object of type %s to type %s",
50            object->instanceClassName(), reinterpret_cast<T>(0)->className());
51        ASSERT_NOT_REACHED();
52        return false;
53    }
54
55    return true;
56}
57
58template <class T>
59inline const T ewk_object_cast(const EwkObject* object)
60{
61    return ewk_object_cast_check<T>(object) ? static_cast<T>(object) : 0;
62}
63
64template <class T>
65inline T ewk_object_cast(EwkObject* object)
66{
67    return ewk_object_cast_check<T>(object) ? static_cast<T>(object) : 0;
68}
69
70#define EWK_OBJ_GET_IMPL_OR_RETURN(ImplClass, object, impl, ...)           \
71    ImplClass* impl = ewk_object_cast<ImplClass*>(object);                 \
72    if (!impl)                                                             \
73        return __VA_ARGS__
74
75
76#define EWK_OBJECT_DECLARE(_className)                                     \
77static const char* className()                                             \
78{                                                                          \
79    static const char* name = #_className;                                 \
80    return name;                                                           \
81}                                                                          \
82virtual const char* instanceClassName() const                              \
83{                                                                          \
84    return className();                                                    \
85}
86
87#endif // ewk_object_private_h
88