109110111112113114115116
throw new IllegalArgumentException("element must not be null"); final String id = element.id; if (id != null && this.idMap.put(id, element) != null) throw new DocumentException( "Element with id '" + id + "' already registered"); }
128129130131132133134135
if (element == null) throw new IllegalArgumentException("element must not be null"); final String id = element.id; if (id != null && this.idMap.remove(id) == null) throw new DocumentException( "Element with id '" + id + "' not registered"); }