granicus.if.org Git - icinga2/blob - lib/base/type.hpp

   1 /******************************************************************************
   2  * Icinga 2                                                                   *
   3  * Copyright (C) 2012-2014 Icinga Development Team (http://www.icinga.org)    *
   4  *                                                                            *
   5  * This program is free software; you can redistribute it and/or              *
   6  * modify it under the terms of the GNU General Public License                *
   7  * as published by the Free Software Foundation; either version 2             *
   8  * of the License, or (at your option) any later version.                     *
   9  *                                                                            *
  10  * This program is distributed in the hope that it will be useful,            *
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of             *
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the              *
  13  * GNU General Public License for more details.                               *
  14  *                                                                            *
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  16  * along with this program; if not, write to the Free Software Foundation     *
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.             *
  18  ******************************************************************************/
  19
  20 #ifndef TYPE_H
  21 #define TYPE_H
  22
  23 #include "base/i2-base.hpp"
  24 #include "base/qstring.hpp"
  25 #include "base/object.hpp"
  26 #include "base/initialize.hpp"
  27 #include <boost/function.hpp>
  28
  29 namespace icinga
  30 {
  31
  32 struct Field
  33 {
  34         int ID;
  35         const char *Name;
  36         int Attributes;
  37
  38         Field(int id, const char *name, int attributes)
  39                 : ID(id), Name(name), Attributes(attributes)
  40         { }
  41 };
  42
  43 enum TypeAttribute
  44 {
  45         TAAbstract = 1,
  46         TASafe = 2
  47 };
  48
  49 class I2_BASE_API Type
  50 {
  51 public:
  52         typedef boost::function<Object::Ptr (void)> Factory;
  53
  54         virtual String GetName(void) const = 0;
  55         virtual const Type *GetBaseType(void) const = 0;
  56         virtual int GetAttributes(void) const = 0;
  57         virtual int GetFieldId(const String& name) const = 0;
  58         virtual Field GetFieldInfo(int id) const = 0;
  59         virtual int GetFieldCount(void) const = 0;
  60
  61         Object::Ptr Instantiate(void) const;
  62
  63         bool IsAssignableFrom(const Type *other) const;
  64
  65         bool IsAbstract(void) const;
  66         bool IsSafe(void) const;
  67
  68         static void Register(const Type *type);
  69         static const Type *GetByName(const String& name);
  70
  71         void SetFactory(const Factory& factory);
  72
  73 private:
  74         typedef std::map<String, const Type *> TypeMap;
  75
  76         static TypeMap& GetTypes(void);
  77
  78         Factory m_Factory;
  79 };
  80
  81 template<typename T>
  82 class TypeImpl
  83 {
  84 };
  85
  86 template<typename T>
  87 shared_ptr<T> ObjectFactory(void)
  88 {
  89         return make_shared<T>();
  90 }
  91
  92 template<typename T>
  93 struct FactoryHelper
  94 {
  95         Type::Factory GetFactory(void)
  96         {
  97                 return ObjectFactory<T>;
  98         }
  99 };
 100
 101 #define REGISTER_TYPE(type) \
 102         namespace { \
 103                 void RegisterType(void) \
 104                 { \
 105                         icinga::Type *t = new TypeImpl<type>(); \
 106                         t->SetFactory(FactoryHelper<type>().GetFactory()); \
 107                         icinga::Type::Register(t); \
 108                 } \
 109                 \
 110                 INITIALIZE_ONCE(RegisterType); \
 111         }
 112
 113 }
 114
 115 #endif /* TYPE_H */