private Header readHeader()

in protonj2/src/main/java/org/apache/qpid/protonj2/codec/decoders/messaging/HeaderTypeDecoder.java [146:195]
40 lines of code
11 McCabe index (conditional complexity)

    private Header readHeader(InputStream stream, StreamDecoderState state, ListTypeDecoder listDecoder) throws DecodeException {
        final Header header = new Header();

        @SuppressWarnings("unused")
        final int size = listDecoder.readSize(stream, state);
        final int count = listDecoder.readCount(stream, state);

        // Don't decode anything if things already look wrong.
        if (count < MIN_HEADER_LIST_ENTRIES) {
            throw new DecodeException("Not enough entries in Header list encoding: " + count);
        }

        if (count > MAX_HEADER_LIST_ENTRIES) {
            throw new DecodeException("To many entries in Header list encoding: " + count);
        }

        for (int index = 0; index < count; ++index) {
            // If the stream allows we peek ahead and see if there is a null in the next slot,
            // if so we don't call the setter for that entry to ensure the returned type reflects
            // the encoded state in the modification entry.
            if (stream.markSupported()) {
                stream.mark(1);
                if (ProtonStreamUtils.readByte(stream) == EncodingCodes.NULL) {
                    continue;
                } else {
                    ProtonStreamUtils.reset(stream);
                }
            }

            switch (index) {
                case 0:
                    header.setDurable(state.getDecoder().readBoolean(stream, state, false));
                    break;
                case 1:
                    header.setPriority(state.getDecoder().readUnsignedByte(stream, state, Header.DEFAULT_PRIORITY));
                    break;
                case 2:
                    header.setTimeToLive(state.getDecoder().readUnsignedInteger(stream, state, 0l));
                    break;
                case 3:
                    header.setFirstAcquirer(state.getDecoder().readBoolean(stream, state, false));
                    break;
                case 4:
                    header.setDeliveryCount(state.getDecoder().readUnsignedInteger(stream, state, 0l));
                    break;
            }
        }

        return header;
    }