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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.netatmo.internal.deserialization;
  14
  15 import java.time.Instant;
  16 import java.time.ZonedDateTime;
  17
  18 import org.eclipse.jdt.annotation.NonNullByDefault;
  19 import org.eclipse.jdt.annotation.Nullable;
  20 import org.openhab.binding.netatmo.internal.api.NetatmoException;
  21 import org.openhab.binding.netatmo.internal.api.data.ModuleType;
  22 import org.openhab.core.i18n.TimeZoneProvider;
  23 import org.openhab.core.library.types.OnOffType;
  24 import org.openhab.core.library.types.OpenClosedType;
  25 import org.osgi.service.component.annotations.Activate;
  26 import org.osgi.service.component.annotations.Component;
  27 import org.osgi.service.component.annotations.Reference;
  28
  29 import com.google.gson.FieldNamingPolicy;
  30 import com.google.gson.Gson;
  31 import com.google.gson.GsonBuilder;
  32 import com.google.gson.JsonDeserializer;
  33 import com.google.gson.JsonSyntaxException;
  34
  35 /**
  36  * The {@link NADeserializer} is responsible to instantiate suitable Gson (de)serializer
  37  *
  38  * @author Gaël L'hopital - Initial contribution
  39  */
  40 @NonNullByDefault
  41 @Component(service = NADeserializer.class)
  42 public class NADeserializer {
  43     private final Gson gson;
  44
  45     @Activate
  46     public NADeserializer(@Reference TimeZoneProvider timeZoneProvider) {
  47         gson = new GsonBuilder().setFieldNamingPolicy(FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES)
  48                 .registerTypeAdapterFactory(new StrictEnumTypeAdapterFactory())
  49                 .registerTypeAdapter(NAObjectMap.class, new NAObjectMapDeserializer())
  50                 .registerTypeAdapter(NAPushType.class, new NAPushTypeDeserializer())
  51                 .registerTypeAdapter(ModuleType.class, new ModuleTypeDeserializer())
  52                 .registerTypeAdapter(ZonedDateTime.class,
  53                         (JsonDeserializer<ZonedDateTime>) (json, type, jsonDeserializationContext) -> {
  54                             long netatmoTS = json.getAsJsonPrimitive().getAsLong();
  55                             Instant i = Instant.ofEpochSecond(netatmoTS);
  56                             return ZonedDateTime.ofInstant(i, timeZoneProvider.getTimeZone());
  57                         })
  58                 .registerTypeAdapter(OnOffType.class,
  59                         (JsonDeserializer<OnOffType>) (json, type, jsonDeserializationContext) -> OnOffType
  60                                 .from(json.getAsJsonPrimitive().getAsString()))
  61                 .registerTypeAdapter(OpenClosedType.class,
  62                         (JsonDeserializer<OpenClosedType>) (json, type, jsonDeserializationContext) -> {
  63                             String value = json.getAsJsonPrimitive().getAsString().toUpperCase();
  64                             return "TRUE".equals(value) || "1".equals(value) ? OpenClosedType.CLOSED
  65                                     : OpenClosedType.OPEN;
  66                         })
  67                 .create();
  68     }
  69
  70     public <T> T deserialize(Class<T> clazz, String json) throws NetatmoException {
  71         try {
  72             @Nullable
  73             T result = gson.fromJson(json, clazz);
  74             if (result != null) {
  75                 return result;
  76             }
  77             throw new NetatmoException("Deserialization of '%s' resulted in null value", json);
  78         } catch (JsonSyntaxException e) {
  79             throw new NetatmoException(e, "Unexpected error deserializing '%s'", json);
  80         }
  81     }
  82 }