/src/logging-log4cxx/src/main/include/log4cxx/helpers/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 helpers::Class\
  {\
    public:\
      Clazz##object() : helpers::Class() {}\
      virtual ~Clazz##object() {}\
      virtual LOG4CXX_NS::LogString getName() const { return LOG4CXX_STR(#object); } \
  };\
  static const helpers::Class& getStaticClass(); \
  static const LOG4CXX_NS::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 helpers::Class\
  {\
    public:\
      Clazz##object() : helpers::Class() {}\
      virtual ~Clazz##object() {}\
      virtual LOG4CXX_NS::LogString getName() const { return LOG4CXX_STR(#object); } \
      virtual object* newInstance() const\
      {\
        return new object();\
      }\
  };\
  const helpers::Class& getClass() const override;\
  static const helpers::Class& getStaticClass(); \
  static const LOG4CXX_NS::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 LOG4CXX_NS::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 ::LOG4CXX_NS::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 LOG4CXX_NS::helpers::ClassRegistration& object##Registration = object::registerClass(); \
  } }

namespace LOG4CXX_NS
{
class AppenderSkeleton;
class Logger;

namespace helpers
{
class Pool;

/** base class for java-like objects.*/
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);
}

/**
 * Attempt to cast one Object to another kind of Object.
 *
 * On success, returns a new shared pointer that points at incoming.
 * On failure, returns an invalid shared pointer.
 */
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

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Created: 2025-08-26 06:48