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   1 /**
   2  * Copyright (c) 2010-2020 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.synopanalyser.internal.discovery;
  14
  15 import static org.openhab.binding.synopanalyzer.internal.SynopAnalyzerBindingConstants.THING_SYNOP;
  16
  17 import java.util.Collections;
  18 import java.util.Comparator;
  19 import java.util.HashMap;
  20 import java.util.LinkedHashMap;
  21 import java.util.Map;
  22 import java.util.Optional;
  23 import java.util.stream.Collectors;
  24
  25 import org.eclipse.jdt.annotation.NonNullByDefault;
  26 import org.openhab.binding.synopanalyser.internal.synop.StationDB;
  27 import org.openhab.binding.synopanalyser.internal.synop.StationDB.Station;
  28 import org.openhab.binding.synopanalyzer.internal.config.SynopAnalyzerConfiguration;
  29 import org.openhab.core.config.discovery.AbstractDiscoveryService;
  30 import org.openhab.core.config.discovery.DiscoveryResultBuilder;
  31 import org.openhab.core.i18n.LocationProvider;
  32 import org.openhab.core.library.types.DecimalType;
  33 import org.openhab.core.library.types.PointType;
  34 import org.openhab.core.thing.ThingUID;
  35 import org.slf4j.Logger;
  36 import org.slf4j.LoggerFactory;
  37
  38 /**
  39  * The {@link SynopAnalyzerDiscoveryService} creates things based on the configured location.
  40  *
  41  * @author Gaël L'hopital - Initial Contribution
  42  */
  43 @NonNullByDefault
  44 public class SynopAnalyzerDiscoveryService extends AbstractDiscoveryService {
  45     private final Logger logger = LoggerFactory.getLogger(SynopAnalyzerDiscoveryService.class);
  46     private static final int DISCOVER_TIMEOUT_SECONDS = 5;
  47     private LocationProvider locationProvider;
  48     private final StationDB stationDB;
  49     private final Map<Integer, Double> distances = new HashMap<>();
  50
  51     /**
  52      * Creates a SynopAnalyzerDiscoveryService with enabled autostart.
  53      *
  54      */
  55     public SynopAnalyzerDiscoveryService(StationDB stationDB, LocationProvider locationProvider) {
  56         super(Collections.singleton(THING_SYNOP), DISCOVER_TIMEOUT_SECONDS);
  57         this.locationProvider = locationProvider;
  58         this.stationDB = stationDB;
  59     }
  60
  61     @Override
  62     public void startScan() {
  63         logger.debug("Starting Synop Analyzer discovery scan");
  64         PointType location = locationProvider.getLocation();
  65         if (location == null) {
  66             logger.debug("LocationProvider.getLocation() is not set -> Will not provide any discovery results");
  67             return;
  68         }
  69         createResults(location);
  70     }
  71
  72     public void createResults(PointType serverLocation) {
  73         distances.clear();
  74
  75         stationDB.stations.forEach(s -> {
  76             PointType stationLocation = new PointType(s.getLocation());
  77             DecimalType distance = serverLocation.distanceFrom(stationLocation);
  78             distances.put(s.idOmm, distance.doubleValue());
  79         });
  80
  81         Map<Integer, Double> result = distances.entrySet().stream()
  82                 .sorted(Map.Entry.comparingByValue(Comparator.naturalOrder())).collect(Collectors.toMap(
  83                         Map.Entry::getKey, Map.Entry::getValue, (oldValue, newValue) -> oldValue, LinkedHashMap::new));
  84
  85         Integer nearestId = result.entrySet().iterator().next().getKey();
  86         Optional<Station> station = stationDB.stations.stream().filter(s -> s.idOmm == nearestId).findFirst();
  87         thingDiscovered(DiscoveryResultBuilder.create(new ThingUID(THING_SYNOP, Integer.toString(nearestId)))
  88                 .withLabel("Synop : " + station.get().usualName)
  89                 .withProperty(SynopAnalyzerConfiguration.STATION_ID, nearestId)
  90                 .withRepresentationProperty(SynopAnalyzerConfiguration.STATION_ID).build());
  91     }
  92 }