object.h

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 
#ifndef _LOG4CXX_HELPERS_OBJECT_H
#define _LOG4CXX_HELPERS_OBJECT_H
 
#include <log4cxx/logstring.h>
#include <log4cxx/helpers/class.h>
#include <log4cxx/helpers/classregistration.h>
#include <log4cxx/helpers/widelife.h>
 
 
#define DECLARE_LOG4CXX_CLAZZ_OBJECT(object)\
    public:\
    class Clazz##object : public LOG4CXX_NS::helpers::Class\
    {\
        public:\
            LogString getName() const override { return LOG4CXX_STR(#object); }\
    };\
    static const helpers::Class& getStaticClass();\
    static const helpers::ClassRegistration& registerClass();
 
#define DECLARE_ABSTRACT_LOG4CXX_OBJECT(object)\
    DECLARE_LOG4CXX_CLAZZ_OBJECT(object)\
    const helpers::Class& getClass() const override;
 
#define DECLARE_LOG4CXX_OBJECT(object)\
    public:\
    class Clazz##object : public LOG4CXX_NS::helpers::Class\
    {\
        public:\
            LogString getName() const override { return LOG4CXX_STR(#object); }\
            object* newInstance() const override\
            {\
                return new object();\
            }\
    };\
    const helpers::Class& getClass() const override;\
    static const helpers::Class& getStaticClass(); \
    static const helpers::ClassRegistration& registerClass();
 
#define DECLARE_LOG4CXX_OBJECT_WITH_CUSTOM_CLASS(object, class)\
    public:\
    const helpers::Class& getClass() const override;\
    static const helpers::Class& getStaticClass();\
    static const helpers::ClassRegistration& registerClass();
 
#define IMPLEMENT_LOG4CXX_OBJECT(object)\
    const ::LOG4CXX_NS::helpers::Class& object::getClass() const { return getStaticClass(); }\
    const ::LOG4CXX_NS::helpers::Class& object::getStaticClass() { \
        static ::LOG4CXX_NS::helpers::WideLife<Clazz##object> theClass; \
        return theClass;                                       \
    }                                                                      \
    const LOG4CXX_NS::helpers::ClassRegistration& object::registerClass() {   \
        static ::LOG4CXX_NS::helpers::WideLife<::LOG4CXX_NS::helpers::ClassRegistration> classReg(object::getStaticClass); \
        return classReg; \
    }\
    namespace LOG4CXX_NS { namespace classes { \
    const helpers::ClassRegistration& object##Registration = object::registerClass(); \
    } }
 
 
#define IMPLEMENT_LOG4CXX_OBJECT_WITH_CUSTOM_CLASS(object, class)\
    const LOG4CXX_NS::helpers::Class& object::getClass() const { return getStaticClass(); }\
    const LOG4CXX_NS::helpers::Class& object::getStaticClass() { \
        static LOG4CXX_NS::helpers::WideLife<class> theClass; \
        return theClass;                                       \
    }                                                         \
    const LOG4CXX_NS::helpers::ClassRegistration& object::registerClass() {   \
        static LOG4CXX_NS::helpers::WideLife<LOG4CXX_NS::helpers::ClassRegistration> classReg(object::getStaticClass); \
        return classReg; \
    }\
    namespace LOG4CXX_NS { namespace classes { \
    const helpers::ClassRegistration& object##Registration = object::registerClass(); \
    } }
 
namespace LOG4CXX_NS
{
class AppenderSkeleton;
class Logger;
 
namespace helpers
{
class Pool;

class LOG4CXX_EXPORT Object
{
    public:
        virtual ~Object() {}
        virtual const helpers::Class& getClass() const = 0;
        virtual bool instanceof(const Class& clazz) const = 0;
        virtual const void* cast(const Class& clazz) const = 0;
        DECLARE_LOG4CXX_CLAZZ_OBJECT(Object)
};
LOG4CXX_PTR_DEF(Object);
}

template<typename Ret,
    typename Type,
    bool = std::is_base_of<Ret, helpers::Object>::value,
    bool = std::is_base_of<Type, helpers::Object>::value>
std::shared_ptr<Ret> cast(const std::shared_ptr<Type>& incoming)
{
    if(!incoming)
    {
        return std::shared_ptr<Ret>();
    }
 
    Ret* casted = reinterpret_cast<Ret*>(const_cast<void*>(incoming->cast(Ret::getStaticClass())));
 
    if ( casted )
    {
        return std::shared_ptr<Ret>( incoming, casted );
    }
 
    return std::shared_ptr<Ret>();
}
 
}
 
#define BEGIN_LOG4CXX_CAST_MAP()\
    const void * cast(const helpers::Class& clazz) const override\
    {\
        const void * object = 0;\
        if (&clazz == &helpers::Object::getStaticClass()) return (const helpers::Object *)this;
 
#define END_LOG4CXX_CAST_MAP()\
    return object;\
    }\
    bool instanceof(const helpers::Class& clazz) const override\
    { return cast(clazz) != 0; }
 
#define LOG4CXX_CAST_ENTRY(Interface)\
    if (&clazz == &Interface::getStaticClass()) return (const Interface *)this;
 
#define LOG4CXX_CAST_ENTRY2(Interface, interface2)\
    if (&clazz == &Interface::getStaticClass()) return (Interface *)(interface2 *)this;
 
#define LOG4CXX_CAST_ENTRY_CHAIN(Interface)\
    object = Interface::cast(clazz);\
    if (object != 0) return object;
 
#endif //_LOG4CXX_HELPERS_OBJECT_H