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/string.hpp"
  25 #include "base/object.hpp"
  26 #include "base/initialize.hpp"
  27 #include "base/utility.hpp"
  28 #include <boost/function.hpp>
  29
  30 namespace icinga
  31 {
  32
  33 enum FieldAttribute
  34 {
  35         FAConfig = 1,
  36         FAState = 2
  37 };
  38
  39 class Type;
  40
  41 struct Field
  42 {
  43         int ID;
  44         const Type *FType;
  45         const char *Name;
  46         int Attributes;
  47
  48         Field(int id, const Type *type, const char *name, int attributes)
  49                 : ID(id), FType(type), Name(name), Attributes(attributes)
  50         { }
  51 };
  52
  53 enum TypeAttribute
  54 {
  55         TAAbstract = 1
  56 };
  57
  58 class I2_BASE_API Type
  59 {
  60 public:
  61         typedef boost::function<Object::Ptr (void)> Factory;
  62
  63         virtual String GetName(void) const = 0;
  64         virtual const Type *GetBaseType(void) const = 0;
  65         virtual int GetAttributes(void) const = 0;
  66         virtual int GetFieldId(const String& name) const = 0;
  67         virtual Field GetFieldInfo(int id) const = 0;
  68         virtual int GetFieldCount(void) const = 0;
  69
  70         Object::Ptr Instantiate(void) const;
  71
  72         bool IsAssignableFrom(const Type *other) const;
  73
  74         bool IsAbstract(void) const;
  75
  76         static void Register(const Type *type);
  77         static const Type *GetByName(const String& name);
  78
  79         void SetFactory(const Factory& factory);
  80
  81 private:
  82         typedef std::map<String, const Type *> TypeMap;
  83
  84         static TypeMap& GetTypes(void);
  85
  86         Factory m_Factory;
  87 };
  88
  89 template<typename T>
  90 class TypeImpl
  91 {
  92 };
  93
  94 template<typename T>
  95 shared_ptr<T> ObjectFactory(void)
  96 {
  97         return make_shared<T>();
  98 }
  99
 100 template<typename T>
 101 struct FactoryHelper
 102 {
 103         Type::Factory GetFactory(void)
 104         {
 105                 return ObjectFactory<T>;
 106         }
 107 };
 108
 109 #define REGISTER_TYPE(type) \
 110         namespace { namespace UNIQUE_NAME(rt) { \
 111                 void RegisterType ## type(void) \
 112                 { \
 113                         icinga::Type *t = new TypeImpl<type>(); \
 114                         t->SetFactory(FactoryHelper<type>().GetFactory()); \
 115                         icinga::Type::Register(t); \
 116                 } \
 117                 \
 118                 INITIALIZE_ONCE(RegisterType ## type); \
 119         } }
 120
 121 }
 122
 123 #endif /* TYPE_H */