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