icinga2/lib/base/type.hpp

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/******************************************************************************
* Icinga 2 *
* Copyright (C) 2012-2014 Icinga Development Team (http://www.icinga.org) *
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* *
* This program is free software; you can redistribute it and/or *
* modify it under the terms of the GNU General Public License *
* as published by the Free Software Foundation; either version 2 *
* of the License, or (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the Free Software Foundation *
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. *
******************************************************************************/
#ifndef TYPE_H
#define TYPE_H
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#include "base/i2-base.hpp"
#include "base/qstring.hpp"
#include "base/object.hpp"
#include "base/initialize.hpp"
#include <boost/function.hpp>
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namespace icinga
{
struct Field
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{
int ID;
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const char *Name;
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int Attributes;
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Field(int id, const char *name, int attributes)
: ID(id), Name(name), Attributes(attributes)
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{ }
};
enum TypeAttribute
{
TAAbstract = 1,
TASafe = 2
};
class I2_BASE_API Type
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{
public:
typedef boost::function<Object::Ptr (void)> Factory;
virtual String GetName(void) const = 0;
virtual const Type *GetBaseType(void) const = 0;
virtual int GetAttributes(void) const = 0;
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virtual int GetFieldId(const String& name) const = 0;
virtual Field GetFieldInfo(int id) const = 0;
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virtual int GetFieldCount(void) const = 0;
Object::Ptr Instantiate(void) const;
bool IsAssignableFrom(const Type *other) const;
bool IsAbstract(void) const;
bool IsSafe(void) const;
static void Register(const Type *type);
static const Type *GetByName(const String& name);
void SetFactory(const Factory& factory);
private:
typedef std::map<String, const Type *> TypeMap;
static TypeMap& GetTypes(void);
Factory m_Factory;
};
template<typename T>
class TypeImpl
{
};
template<typename T>
shared_ptr<T> ObjectFactory(void)
{
return make_shared<T>();
}
template<typename T>
struct FactoryHelper
{
Type::Factory GetFactory(void)
{
return ObjectFactory<T>;
}
};
#define REGISTER_TYPE(type) \
namespace { \
void RegisterType(void) \
{ \
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icinga::Type *t = new TypeImpl<type>(); \
t->SetFactory(FactoryHelper<type>().GetFactory()); \
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icinga::Type::Register(t); \
} \
\
INITIALIZE_ONCE(RegisterType); \
}
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}
#endif /* TYPE_H */