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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.synopanalyzer.internal;
  14
  15 import static org.openhab.binding.synopanalyzer.internal.SynopAnalyzerBindingConstants.THING_SYNOP;
  16
  17 import java.io.IOException;
  18 import java.io.InputStream;
  19 import java.io.InputStreamReader;
  20 import java.io.Reader;
  21 import java.nio.charset.StandardCharsets;
  22 import java.util.Hashtable;
  23
  24 import org.eclipse.jdt.annotation.NonNullByDefault;
  25 import org.eclipse.jdt.annotation.Nullable;
  26 import org.openhab.binding.synopanalyzer.internal.discovery.SynopAnalyzerDiscoveryService;
  27 import org.openhab.binding.synopanalyzer.internal.handler.SynopAnalyzerHandler;
  28 import org.openhab.binding.synopanalyzer.internal.synop.StationDB;
  29 import org.openhab.core.config.discovery.DiscoveryService;
  30 import org.openhab.core.i18n.LocationProvider;
  31 import org.openhab.core.thing.Thing;
  32 import org.openhab.core.thing.ThingTypeUID;
  33 import org.openhab.core.thing.binding.BaseThingHandlerFactory;
  34 import org.openhab.core.thing.binding.ThingHandler;
  35 import org.openhab.core.thing.binding.ThingHandlerFactory;
  36 import org.osgi.framework.ServiceRegistration;
  37 import org.osgi.service.component.ComponentContext;
  38 import org.osgi.service.component.annotations.Activate;
  39 import org.osgi.service.component.annotations.Component;
  40 import org.osgi.service.component.annotations.Reference;
  41 import org.slf4j.Logger;
  42 import org.slf4j.LoggerFactory;
  43
  44 import com.google.gson.Gson;
  45
  46 /**
  47  * The {@link SynopAnalyzerHandlerFactory} is responsible for creating things and thing
  48  * handlers.
  49  *
  50  * @author Gaël L'hopital - Initial contribution
  51  */
  52
  53 @Component(service = ThingHandlerFactory.class, configurationPid = "binding.synopanalyzer")
  54 @NonNullByDefault
  55 public class SynopAnalyzerHandlerFactory extends BaseThingHandlerFactory {
  56     private final Logger logger = LoggerFactory.getLogger(SynopAnalyzerHandlerFactory.class);
  57     private final LocationProvider locationProvider;
  58     private final Gson gson = new Gson();
  59     private @Nullable StationDB stationDB;
  60     private @Nullable ServiceRegistration<?> serviceReg;
  61
  62     @Activate
  63     public SynopAnalyzerHandlerFactory(@Reference LocationProvider locationProvider) {
  64         this.locationProvider = locationProvider;
  65     }
  66
  67     @Override
  68     public boolean supportsThingType(ThingTypeUID thingTypeUID) {
  69         return THING_SYNOP.equals(thingTypeUID);
  70     }
  71
  72     @Override
  73     protected @Nullable ThingHandler createHandler(Thing thing) {
  74         return supportsThingType(thing.getThingTypeUID()) ? new SynopAnalyzerHandler(thing, locationProvider, stationDB)
  75                 : null;
  76     }
  77
  78     @Override
  79     protected void activate(ComponentContext componentContext) {
  80         super.activate(componentContext);
  81
  82         try (InputStream is = Thread.currentThread().getContextClassLoader().getResourceAsStream("/db/stations.json");
  83                 Reader reader = new InputStreamReader(is, StandardCharsets.UTF_8);) {
  84
  85             StationDB stations = gson.fromJson(reader, StationDB.class);
  86             registerDiscoveryService(stations);
  87             this.stationDB = stations;
  88             logger.debug("Discovery service for Synop Stations registered.");
  89         } catch (IOException e) {
  90             logger.warn("Unable to read synop stations database");
  91         }
  92     }
  93
  94     @Override
  95     protected void deactivate(ComponentContext componentContext) {
  96         unregisterDiscoveryService();
  97         super.deactivate(componentContext);
  98     }
  99
 100     private void registerDiscoveryService(StationDB stations) {
 101         SynopAnalyzerDiscoveryService discoveryService = new SynopAnalyzerDiscoveryService(stations, locationProvider);
 102
 103         serviceReg = bundleContext.registerService(DiscoveryService.class.getName(), discoveryService,
 104                 new Hashtable<>());
 105     }
 106
 107     private void unregisterDiscoveryService() {
 108         if (serviceReg != null) {
 109             serviceReg.unregister();
 110             serviceReg = null;
 111         }
 112     }
 113 }