private void assignPropertiesToMessage()

in iothub/device/iot-device-client/src/main/java/com/microsoft/azure/sdk/iot/device/transport/mqtt/Mqtt.java [467:522]
49 lines of code
13 McCabe index (conditional complexity)

    private void assignPropertiesToMessage(Message message, String propertiesString) throws IllegalStateException, IllegalArgumentException
    {
        for (String propertyString : propertiesString.split(String.valueOf(MESSAGE_PROPERTY_SEPARATOR)))
        {
            if (propertyString.contains("="))
            {
                //Expected format is <key>=<value> where both key and value may be encoded
                String key = propertyString.split("=")[PROPERTY_KEY_INDEX];
                String value = propertyString.split("=")[PROPERTY_VALUE_INDEX];

                try
                {
                    key = URLDecoder.decode(key, StandardCharsets.UTF_8.name());
                    value = URLDecoder.decode(value, StandardCharsets.UTF_8.name());
                }
                catch (UnsupportedEncodingException e)
                {
                    // should never happen, since the encoding is hard-coded.
                    throw new IllegalStateException(e);
                }

                //Some properties are reserved system properties and must be saved in the message differently
                //Codes_SRS_Mqtt_34_057: [This function shall parse the messageId, correlationId, outputname, content encoding and content type from the provided property string]
                switch (key)
                {
                    case TO:
                    case IOTHUB_ACK:
                    case USER_ID:
                    case ABSOLUTE_EXPIRY_TIME:
                        //do nothing
                        break;
                    case MESSAGE_ID:
                        message.setMessageId(value);
                        break;
                    case CORRELATION_ID:
                        message.setCorrelationId(value);
                        break;
                    case OUTPUT_NAME:
                        message.setOutputName(value);
                        break;
                    case CONTENT_ENCODING:
                        message.setContentEncoding(value);
                        break;
                    case CONTENT_TYPE:
                        message.setContentType(value);
                        break;
                    default:
                        message.setProperty(key, value);
                }
            }
            else
            {
                throw new IllegalArgumentException("Unexpected property string provided. Expected '=' symbol between key and value of the property in string: " + propertyString);
            }
        }
    }