protected DBusSignal()

in dbus-java/src/main/java/org/freedesktop/dbus/messages/DBusSignal.java [240:325]
80 lines of code
12 McCabe index (conditional complexity)

    protected DBusSignal(String objectpath, Object... args) throws DBusException {
        super(DBusConnection.getEndianness(), Message.MessageType.SIGNAL, (byte) 0);

        if (!objectpath.matches(AbstractConnection.OBJECT_REGEX)) {
            throw new DBusException("Invalid object path: " + objectpath);
        }

        Class<? extends DBusSignal> tc = getClass();
        String member;
        if (tc.isAnnotationPresent(DBusMemberName.class)) {
            member = tc.getAnnotation(DBusMemberName.class).value();
        } else {
            member = tc.getSimpleName();
        }
        String iface = null;
        Class<? extends Object> enc = tc.getEnclosingClass();
        if (null == enc || !DBusInterface.class.isAssignableFrom(enc) || enc.getName().equals(enc.getSimpleName())) {
            throw new DBusException(
                    "Signals must be declared as a member of a class implementing DBusInterface which is the member of a package.");
        } else if (null != enc.getAnnotation(DBusInterfaceName.class)) {
            iface = enc.getAnnotation(DBusInterfaceName.class).value();
        } else {
            iface = AbstractConnection.DOLLAR_PATTERN.matcher(enc.getName()).replaceAll(".");
        }

        getHeaders().put(Message.HeaderField.PATH, objectpath);
        getHeaders().put(Message.HeaderField.MEMBER, member);
        getHeaders().put(Message.HeaderField.INTERFACE, iface);

        List<Object> hargs = new ArrayList<>();
        hargs.add(new Object[] {
                Message.HeaderField.PATH, new Object[] {
                        ArgumentType.OBJECT_PATH_STRING, objectpath
                }
        });
        hargs.add(new Object[] {
                Message.HeaderField.INTERFACE, new Object[] {
                        ArgumentType.STRING_STRING, iface
                }
        });
        hargs.add(new Object[] {
                Message.HeaderField.MEMBER, new Object[] {
                        ArgumentType.STRING_STRING, member
                }
        });

        String sig = null;
        if (0 < args.length) {
            try {
                Type[] types = TYPE_CACHE.get(tc);
                if (null == types) {
                    Constructor<? extends DBusSignal> con =
                            (Constructor<? extends DBusSignal>) tc.getDeclaredConstructors()[0];
                    CONSTRUCTOR_CACHE.put(tc, con);
                    Type[] ts = con.getGenericParameterTypes();
                    types = new Type[ts.length - 1];
                    for (int i = 1; i <= types.length; i++) {
                        if (ts[i] instanceof TypeVariable) {
                            types[i - 1] = ((TypeVariable<GenericDeclaration>) ts[i]).getBounds()[0];
                        } else {
                            types[i - 1] = ts[i];
                        }
                    }
                    TYPE_CACHE.put(tc, types);
                }
                sig = Marshalling.getDBusType(types);
                hargs.add(new Object[] {
                        Message.HeaderField.SIGNATURE, new Object[] {
                                ArgumentType.SIGNATURE_STRING, sig
                        }
                });
                getHeaders().put(Message.HeaderField.SIGNATURE, sig);
                setArgs(args);
            } catch (Exception e) {
                logger.debug("", e);
                throw new DBusException("Failed to add signal parameters: " + e.getMessage());
            }
        }

        blen = new byte[4];
        appendBytes(blen);
        long newSerial = getSerial() + 1;
        setSerial(newSerial);
        append("ua(yv)", newSerial, hargs.toArray());
        pad((byte) 8);
    }