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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.jeelink.internal.lacrosse;
  14
  15 import org.openhab.binding.jeelink.internal.ReadingPublisher;
  16 import org.slf4j.Logger;
  17 import org.slf4j.LoggerFactory;
  18
  19 /**
  20  * Checks that the given temperature does not differ too much from the last temperature
  21  * before passing it on to the next publisher.
  22  *
  23  * @author Volker Bier - Initial contribution
  24  */
  25 public class DifferenceCheckingPublisher implements ReadingPublisher<LaCrosseTemperatureReading> {
  26     private final Logger logger = LoggerFactory.getLogger(DifferenceCheckingPublisher.class);
  27
  28     private final ReadingPublisher<LaCrosseTemperatureReading> publisher;
  29     private final float allowedDifference;
  30
  31     private LaCrosseTemperatureReading lastReading;
  32
  33     public DifferenceCheckingPublisher(float difference, ReadingPublisher<LaCrosseTemperatureReading> p) {
  34         allowedDifference = difference;
  35         publisher = p;
  36     }
  37
  38     @Override
  39     public void publish(LaCrosseTemperatureReading reading) {
  40         if (lastReading == null
  41                 || Math.abs(reading.getTemperature() - lastReading.getTemperature()) < allowedDifference) {
  42             publisher.publish(reading);
  43         } else {
  44             logger.debug("Ignoring reading {} differing too much from previous value", reading.getTemperature());
  45         }
  46
  47         lastReading = reading;
  48     }
  49
  50     @Override
  51     public void dispose() {
  52         publisher.dispose();
  53     }
  54 }