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   1 /**
   2  * Copyright (c) 2010-2022 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.proteusecometer.internal.ecometers;
  14
  15 import java.util.Optional;
  16
  17 import org.eclipse.jdt.annotation.NonNullByDefault;
  18 import org.openhab.core.util.HexUtils;
  19 import org.slf4j.Logger;
  20 import org.slf4j.LoggerFactory;
  21
  22 /**
  23  * Parse the bytes from the device
  24  *
  25  * @author Matthias Herrmann - Initial contribution
  26  *
  27  */
  28 @NonNullByDefault
  29 class ProteusEcoMeterSParser {
  30
  31     private final Logger logger = LoggerFactory.getLogger(ProteusEcoMeterSParser.class);
  32
  33     /**
  34      * @param bytes Raw bytes send from the device
  35      * @return A structured version of the bytes, if possible
  36      */
  37     public Optional<ProteusEcoMeterSReply> parseFromBytes(final byte[] bytes) {
  38         return Optional.ofNullable(bytes).flatMap(b -> {
  39             final String hexString = HexUtils.bytesToHex(b);
  40             logger.trace("Received hex string: {}", hexString);
  41
  42             if (hexString.length() < 4) {
  43                 return Optional.empty();
  44             } else {
  45                 final String marker = hexString.substring(0, 4);
  46                 if (!"5349".equals(marker)) {
  47                     logger.trace("Marker is not {} but {}", "5349", marker);
  48                     return Optional.empty();
  49                 } else if (hexString.length() < 40) {
  50                     logger.trace("hexString is of length {}, expected >= 40", hexString.length());
  51                     return Optional.empty();
  52                 } else {
  53                     try {
  54                         return Optional
  55                                 .of(new ProteusEcoMeterSReply(parseInt(hexString.substring(26, 28), "tempInFahrenheit"),
  56                                         parseInt(hexString.substring(28, 32), "sensorLevelInCm"),
  57                                         parseInt(hexString.substring(32, 36), "usableLevelInLiter"),
  58                                         parseInt(hexString.substring(36, 40), "totalCapacityInLiter")));
  59                     } catch (final NumberFormatException e) {
  60                         logger.debug("Error while parsing numbers", e);
  61                         return Optional.empty();
  62                     }
  63                 }
  64             }
  65         });
  66     }
  67
  68     private Integer parseInt(final String toParse, final String fieldName) throws NumberFormatException {
  69         try {
  70             return Integer.parseInt(toParse, 16);
  71         } catch (final NumberFormatException e) {
  72             logger.trace("Unable to parse field {}", fieldName, e);
  73             throw e;
  74         }
  75     }
  76 }