Method addPlaceGroup

src/main/java/mudmap2/backend/World.java:450–459

Adds a PlaceGroup @param placeGroup new PlaceGroup

(PlaceGroup placeGroup)

     * @param placeGroup new PlaceGroup
     */
    public void addPlaceGroup(PlaceGroup placeGroup) {
        if(placeGroup == null){
            throw new NullPointerException();
        }

        if(!placeGroups.contains(placeGroup)){
            placeGroups.add(placeGroup);
        }
        callListeners(placeGroup);
    }

    /**
     * Removes a PlaceGroup