engine/content_mgr.js

   1 /*
   2  * content_mgr.js
   3  *
   4  * Copyright 2021 Elias Fleckenstein <eliasfleckenstein@web.de>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  19  * MA 02110-1301, USA.
  20  *
  21  *
  22  */
  23
  24 dragonblocks.ContentMgr = class
  25 {
  26         constructor(baseClass)
  27         {
  28                 this.baseClass = baseClass;
  29                 this.clear();
  30         }
  31
  32         register(name, defClass, override)
  33         {
  34                 if (! name)
  35                         throw new Error("Missing name");
  36
  37                 if (! name.search(":"))
  38                         throw new Error("Non-namespaced name");
  39
  40                 if (! defClass)
  41                         throw new Error("Missing definition class");
  42
  43                 if (! (defClass.prototype instanceof this.baseClass))
  44                         throw new Error("Definition class does not extend base class");
  45
  46                 let oldDef = this.getDef(name);
  47
  48                 if (oldDef && ! override)
  49                         throw new Error("Already registered");
  50
  51                 if (! oldDef && override)
  52                         throw new Error("Not registered");
  53
  54                 this.defs[name] = defClass;
  55         }
  56
  57         override(name, def)
  58         {
  59                 this.register(name, def, true);
  60         }
  61
  62         getDef(name)
  63         {
  64                 return this.defs[name];
  65         }
  66
  67         create(name, ...args)
  68         {
  69                 let defClass = this.getDef(name);
  70
  71                 if (! defClass)
  72                         throw new Error("Not defined");
  73
  74                 return new defClass(...args);
  75         }
  76
  77         clear()
  78         {
  79                 this.defs = {};
  80         }
  81 };