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   1 /**
   2  * Copyright (c) 2010-2023 Contributors to the openHAB project
   3  *
   4  * See the NOTICE file(s) distributed with this work for additional
   5  * information.
   6  *
   7  * This program and the accompanying materials are made available under the
   8  * terms of the Eclipse Public License 2.0 which is available at
   9  * http://www.eclipse.org/legal/epl-2.0
  10  *
  11  * SPDX-License-Identifier: EPL-2.0
  12  */
  13 package org.openhab.binding.novafinedust.internal.sds011protocol;
  14
  15 import org.eclipse.jdt.annotation.NonNullByDefault;
  16 import org.eclipse.jdt.annotation.Nullable;
  17 import org.openhab.binding.novafinedust.internal.sds011protocol.messages.ModeReply;
  18 import org.openhab.binding.novafinedust.internal.sds011protocol.messages.SensorFirmwareReply;
  19 import org.openhab.binding.novafinedust.internal.sds011protocol.messages.SensorMeasuredDataReply;
  20 import org.openhab.binding.novafinedust.internal.sds011protocol.messages.SensorReply;
  21 import org.openhab.binding.novafinedust.internal.sds011protocol.messages.SleepReply;
  22 import org.openhab.binding.novafinedust.internal.sds011protocol.messages.WorkingPeriodReply;
  23
  24 /**
  25  * Factory for creating the specific reply instances for data received from the sensor
  26  *
  27  * @author Stefan Triller - Initial contribution
  28  *
  29  */
  30 @NonNullByDefault
  31 public class ReplyFactory {
  32
  33     private static final byte COMMAND_REPLY = (byte) 0xC5;
  34     private static final byte DATA_REPLY = (byte) 0xC0;
  35
  36     private ReplyFactory() {
  37     }
  38
  39     /**
  40      * Creates the specific reply message according to the commandID and first data byte
  41      *
  42      * @param bytes the received message
  43      * @return a specific instance of a sensor reply message
  44      */
  45     public static @Nullable SensorReply create(byte[] bytes) {
  46         if (bytes.length != 10) {
  47             return null;
  48         }
  49
  50         byte commandID = bytes[1];
  51         byte firstDataByte = bytes[2];
  52
  53         if (commandID == COMMAND_REPLY) {
  54             switch (firstDataByte) {
  55                 case Command.FIRMWARE:
  56                     return new SensorFirmwareReply(bytes);
  57                 case Command.WORKING_PERIOD:
  58                     return new WorkingPeriodReply(bytes);
  59                 case Command.MODE:
  60                     return new ModeReply(bytes);
  61                 case Command.SLEEP:
  62                     return new SleepReply(bytes);
  63                 default:
  64                     return new SensorReply(bytes);
  65             }
  66         } else if (commandID == DATA_REPLY) {
  67             return new SensorMeasuredDataReply(bytes);
  68         }
  69         return null;
  70     }
  71 }