+struct LoadingBlockModifierDef
+{
+ // Set of contents to trigger on
+ std::set<std::string> trigger_contents;
+ std::string name;
+ bool run_at_every_load;
+
+ virtual ~LoadingBlockModifierDef() {}
+ virtual void trigger(ServerEnvironment *env, v3s16 p, MapNode n){};
+};
+
+struct LBMContentMapping
+{
+ typedef std::map<content_t, std::vector<LoadingBlockModifierDef *> > container_map;
+ container_map map;
+
+ std::vector<LoadingBlockModifierDef *> lbm_list;
+
+ // Needs to be separate method (not inside destructor),
+ // because the LBMContentMapping may be copied and destructed
+ // many times during operation in the lbm_lookup_map.
+ void deleteContents();
+ void addLBM(LoadingBlockModifierDef *lbm_def, IGameDef *gamedef);
+ const std::vector<LoadingBlockModifierDef *> *lookup(content_t c) const;
+};
+
+class LBMManager
+{
+public:
+ LBMManager():
+ m_query_mode(false)
+ {}
+
+ ~LBMManager();
+
+ // Don't call this after loadIntroductionTimes() ran.
+ void addLBMDef(LoadingBlockModifierDef *lbm_def);
+
+ void loadIntroductionTimes(const std::string ×,
+ IGameDef *gamedef, u32 now);
+
+ // Don't call this before loadIntroductionTimes() ran.
+ std::string createIntroductionTimesString();
+
+ // Don't call this before loadIntroductionTimes() ran.
+ void applyLBMs(ServerEnvironment *env, MapBlock *block, u32 stamp);
+
+ // Warning: do not make this std::unordered_map, order is relevant here
+ typedef std::map<u32, LBMContentMapping> lbm_lookup_map;
+
+private:
+ // Once we set this to true, we can only query,
+ // not modify
+ bool m_query_mode;
+
+ // For m_query_mode == false:
+ // The key of the map is the LBM def's name.
+ // TODO make this std::unordered_map
+ std::map<std::string, LoadingBlockModifierDef *> m_lbm_defs;
+
+ // For m_query_mode == true:
+ // The key of the map is the LBM def's first introduction time.
+ lbm_lookup_map m_lbm_lookup;
+
+ // Returns an iterator to the LBMs that were introduced
+ // after the given time. This is guaranteed to return
+ // valid values for everything
+ lbm_lookup_map::const_iterator getLBMsIntroducedAfter(u32 time)
+ { return m_lbm_lookup.lower_bound(time); }
+};
+