@Override
    public boolean equals(Object obj) {
        if (!(obj instanceof StrokeMessage))
            return false;
        StrokeMessage other = (StrokeMessage) obj;
        if (this.id == other.id && this.drawable.equals(other.drawable) && this.whiteboardID.equals(other.whiteboardID))
            return true;
        else
            return false;
    }