public static Interrogation fromEncodedMessage(EncodedAISMessage encodedMessage) {
if (!encodedMessage.isValid()) throw new InvalidEncodedMessage(encodedMessage);
if (!encodedMessage.getMessageType().equals(AISMessageType.Interrogation))
throw new UnsupportedMessageType(encodedMessage.getMessageType().getCode());
int messageLength = encodedMessage.getNumberOfBits();
Integer repeatIndicator = DecoderImpl.convertToUnsignedInteger(encodedMessage.getBits(6, 8));
MMSI sourceMmsi =
MMSI.valueOf(DecoderImpl.convertToUnsignedLong(encodedMessage.getBits(8, 38)));
MMSI mmsi1 = MMSI.valueOf(DecoderImpl.convertToUnsignedLong(encodedMessage.getBits(40, 70)));
Integer type1_1 = DecoderImpl.convertToUnsignedInteger(encodedMessage.getBits(70, 76));
Integer offset1_1 = DecoderImpl.convertToUnsignedInteger(encodedMessage.getBits(76, 88));
Integer type1_2 =
messageLength > 88
? DecoderImpl.convertToUnsignedInteger(encodedMessage.getBits(90, 96))
: null;
Integer offset1_2 =
messageLength > 88
? DecoderImpl.convertToUnsignedInteger(encodedMessage.getBits(96, 108))
: null;
MMSI mmsi2 =
messageLength > 160
? MMSI.valueOf(DecoderImpl.convertToUnsignedLong(encodedMessage.getBits(110, 140)))
: null;
Integer type2_1 =
messageLength > 160
? DecoderImpl.convertToUnsignedInteger(encodedMessage.getBits(140, 146))
: null;
Integer offset2_1 =
messageLength > 160
? DecoderImpl.convertToUnsignedInteger(encodedMessage.getBits(146, 158))
: null;
return new Interrogation(
repeatIndicator,
sourceMmsi,
mmsi1,
type1_1,
offset1_1,
type1_2,
offset1_2,
mmsi2,
type2_1,
offset2_1);
}
