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   1 /**
   2  * Copyright (c) 2010-2021 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.util.Collections;
  22 import java.util.Hashtable;
  23 import java.util.Set;
  24
  25 import org.eclipse.jdt.annotation.NonNullByDefault;
  26 import org.eclipse.jdt.annotation.Nullable;
  27 import org.openhab.binding.synopanalyser.internal.discovery.SynopAnalyzerDiscoveryService;
  28 import org.openhab.binding.synopanalyser.internal.synop.StationDB;
  29 import org.openhab.binding.synopanalyzer.internal.handler.SynopAnalyzerHandler;
  30 import org.openhab.core.config.discovery.DiscoveryService;
  31 import org.openhab.core.i18n.LocationProvider;
  32 import org.openhab.core.thing.Thing;
  33 import org.openhab.core.thing.ThingTypeUID;
  34 import org.openhab.core.thing.binding.BaseThingHandlerFactory;
  35 import org.openhab.core.thing.binding.ThingHandler;
  36 import org.openhab.core.thing.binding.ThingHandlerFactory;
  37 import org.osgi.framework.ServiceRegistration;
  38 import org.osgi.service.component.ComponentContext;
  39 import org.osgi.service.component.annotations.Activate;
  40 import org.osgi.service.component.annotations.Component;
  41 import org.osgi.service.component.annotations.Reference;
  42 import org.slf4j.Logger;
  43 import org.slf4j.LoggerFactory;
  44
  45 import com.google.gson.Gson;
  46
  47 /**
  48  * The {@link SynopAnalyzerHandlerFactory} is responsible for creating things and thing
  49  * handlers.
  50  *
  51  * @author Gaël L'hopital - Initial contribution
  52  */
  53
  54 @Component(service = ThingHandlerFactory.class, configurationPid = "binding.synopanalyzer")
  55 @NonNullByDefault
  56 public class SynopAnalyzerHandlerFactory extends BaseThingHandlerFactory {
  57     private final Logger logger = LoggerFactory.getLogger(SynopAnalyzerHandlerFactory.class);
  58     private static final Set<ThingTypeUID> SUPPORTED_THING_TYPES_UIDS = Collections.singleton(THING_SYNOP);
  59     private final LocationProvider locationProvider;
  60     private final Gson gson;
  61     private @NonNullByDefault({}) StationDB stationDB;
  62     private @Nullable ServiceRegistration<?> serviceReg;
  63
  64     @Activate
  65     public SynopAnalyzerHandlerFactory(@Reference LocationProvider locationProvider) {
  66         this.locationProvider = locationProvider;
  67         this.gson = new Gson();
  68     }
  69
  70     @Override
  71     public boolean supportsThingType(ThingTypeUID thingTypeUID) {
  72         return SUPPORTED_THING_TYPES_UIDS.contains(thingTypeUID);
  73     }
  74
  75     @Override
  76     protected @Nullable ThingHandler createHandler(Thing thing) {
  77         ThingTypeUID thingTypeUID = thing.getThingTypeUID();
  78
  79         return thingTypeUID.equals(THING_SYNOP) ? new SynopAnalyzerHandler(thing, locationProvider, stationDB) : null;
  80     }
  81
  82     @Override
  83     protected void activate(ComponentContext componentContext) {
  84         super.activate(componentContext);
  85
  86         try (InputStream is = Thread.currentThread().getContextClassLoader().getResourceAsStream("/db/stations.json");
  87                 Reader reader = new InputStreamReader(is, "UTF-8");) {
  88
  89             stationDB = gson.fromJson(reader, StationDB.class);
  90             registerDiscoveryService();
  91             logger.debug("Discovery service for Synop Stations registered.");
  92         } catch (IOException e) {
  93             logger.warn("Unable to read synop stations database");
  94             stationDB = new StationDB();
  95         }
  96     }
  97
  98     @Override
  99     protected void deactivate(ComponentContext componentContext) {
 100         unregisterDiscoveryService();
 101         super.deactivate(componentContext);
 102     }
 103
 104     private void registerDiscoveryService() {
 105         SynopAnalyzerDiscoveryService discoveryService = new SynopAnalyzerDiscoveryService(stationDB, locationProvider);
 106
 107         serviceReg = bundleContext.registerService(DiscoveryService.class.getName(), discoveryService,
 108                 new Hashtable<>());
 109     }
 110
 111     private void unregisterDiscoveryService() {
 112         if (serviceReg != null) {
 113             serviceReg.unregister();
 114             serviceReg = null;
 115         }
 116     }
 117 }