src/objdef.h

   1 /*
   2 Minetest
   3 Copyright (C) 2010-2015 kwolekr, Ryan Kwolek <kwolekr@minetest.net>
   4
   5 This program is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU Lesser General Public License as published by
   7 the Free Software Foundation; either version 2.1 of the License, or
   8 (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 Lesser General Public License for more details.
  14
  15 You should have received a copy of the GNU Lesser General Public License along
  16 with this program; if not, write to the Free Software Foundation, Inc.,
  17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 */
  19
  20 #pragma once
  21
  22 #include "util/basic_macros.h"
  23 #include "porting.h"
  24
  25 class IGameDef;
  26 class NodeDefManager;
  27
  28 #define OBJDEF_INVALID_INDEX ((u32)(-1))
  29 #define OBJDEF_INVALID_HANDLE 0
  30 #define OBJDEF_HANDLE_SALT 0x00585e6fu
  31 #define OBJDEF_MAX_ITEMS (1 << 18)
  32 #define OBJDEF_UID_MASK ((1 << 7) - 1)
  33
  34 typedef u32 ObjDefHandle;
  35
  36 enum ObjDefType {
  37         OBJDEF_GENERIC,
  38         OBJDEF_BIOME,
  39         OBJDEF_ORE,
  40         OBJDEF_DECORATION,
  41         OBJDEF_SCHEMATIC,
  42 };
  43
  44 class ObjDef {
  45 public:
  46         virtual ~ObjDef() = default;
  47
  48         // Only implemented by child classes (leafs in class hierarchy)
  49         // Should create new object of its own type, call cloneTo() of parent class
  50         // and copy its own instance variables over
  51         virtual ObjDef *clone() const = 0;
  52
  53         u32 index;
  54         u32 uid;
  55         ObjDefHandle handle;
  56         std::string name;
  57
  58 protected:
  59         // Only implemented by classes that have children themselves
  60         // by copying the defintion and changing that argument type (!!!)
  61         // Should defer to parent class cloneTo() if applicable and then copy
  62         // over its own properties
  63         void cloneTo(ObjDef *def) const;
  64 };
  65
  66 // WARNING: Ownership of ObjDefs is transferred to the ObjDefManager it is
  67 // added/set to.  Note that ObjDefs managed by ObjDefManager are NOT refcounted,
  68 // so the same ObjDef instance must not be referenced multiple
  69 // TODO: const correctness for getter methods
  70 class ObjDefManager {
  71 public:
  72         ObjDefManager(IGameDef *gamedef, ObjDefType type);
  73         virtual ~ObjDefManager();
  74         DISABLE_CLASS_COPY(ObjDefManager);
  75
  76         // T *clone() const; // implemented in child class with correct type
  77
  78         virtual const char *getObjectTitle() const { return "ObjDef"; }
  79
  80         virtual void clear();
  81         virtual ObjDef *getByName(const std::string &name) const;
  82
  83         //// Add new/get/set object definitions by handle
  84         virtual ObjDefHandle add(ObjDef *obj);
  85         virtual ObjDef *get(ObjDefHandle handle) const;
  86         virtual ObjDef *set(ObjDefHandle handle, ObjDef *obj);
  87
  88         //// Raw variants that work on indexes
  89         virtual u32 addRaw(ObjDef *obj);
  90
  91         // It is generally assumed that getRaw() will always return a valid object
  92         // This won't be true if people do odd things such as call setRaw() with NULL
  93         virtual ObjDef *getRaw(u32 index) const;
  94         virtual ObjDef *setRaw(u32 index, ObjDef *obj);
  95
  96         size_t getNumObjects() const { return m_objects.size(); }
  97         ObjDefType getType() const { return m_objtype; }
  98         const NodeDefManager *getNodeDef() const { return m_ndef; }
  99
 100         u32 validateHandle(ObjDefHandle handle) const;
 101         static ObjDefHandle createHandle(u32 index, ObjDefType type, u32 uid);
 102         static bool decodeHandle(ObjDefHandle handle, u32 *index,
 103                 ObjDefType *type, u32 *uid);
 104
 105 protected:
 106         ObjDefManager() {};
 107         // Helper for child classes to implement clone()
 108         void cloneTo(ObjDefManager *mgr) const;
 109
 110         const NodeDefManager *m_ndef;
 111         std::vector<ObjDef *> m_objects;
 112         ObjDefType m_objtype;
 113 };