public OreVein[] getWorldData(World w){
        if(data.containsKey(w))
            return data.get(w);
        else if ( conf.contains(w.getName()) ){
            data.put(w, OreVein.loadConf( conf.getMapList( w.getName() ) ) );
            return data.get(w);
        }
        else if( def!=null )
            return def;
        else if( conf.contains( "default" ) ){
            def = OreVein.loadConf( conf.getMapList("default") );
            return def;
        }
        return null;
    }