Adding OwnedGift type adapter

Author: mircoianese

library/src/main/java/com/pengrad/telegrambot/model/gift/owned/OwnedGiftRegular.kt

@@ -17,7 +17,11 @@ class OwnedGiftRegular private constructor(
     @get:JvmName("wasRefunded") var wasRefunded: Boolean?,
     @get:JvmName("convertStarCount") var convertStarCount: Int?,
     @get:JvmName("prepaidUpgradeStarCount") var prepaidUpgradeStarCount: Int?
-) : OwnedGift(type = "regular") {
+) : OwnedGift(type = TYPE) {
+
+    companion object {
+        const val TYPE = "regular"
+    }
 
     constructor(gift: Gift, sendDate: Long) : this(
         gift = gift,

library/src/main/java/com/pengrad/telegrambot/model/gift/owned/OwnedGiftUnique.kt

@@ -12,4 +12,10 @@ class OwnedGiftUnique(
     @get:JvmName("isSaved") var isSaved: Boolean?,
     @get:JvmName("canBeTransferred") var canBeTransferred: Boolean?,
     @get:JvmName("transferStarCount") var prepaidUpgradeStarCount: Int?
-) : OwnedGift(type = "unique")
+) : OwnedGift(type = TYPE) {
+
+    companion object {
+        const val TYPE = "unique"
+    }
+
+}

library/src/main/java/com/pengrad/telegrambot/utility/BotUtils.java

@@ -7,6 +7,7 @@
 import com.pengrad.telegrambot.model.chatbackground.BackgroundFill;
 import com.pengrad.telegrambot.model.chatbackground.BackgroundType;
 import com.pengrad.telegrambot.model.chatboost.source.ChatBoostSource;
+import com.pengrad.telegrambot.model.gift.owned.OwnedGift;
 import com.pengrad.telegrambot.model.message.MaybeInaccessibleMessage;
 import com.pengrad.telegrambot.model.message.origin.MessageOrigin;
 import com.pengrad.telegrambot.model.paidmedia.PaidMedia;
@@ -38,6 +39,7 @@ private BotUtils() {}
             .registerTypeAdapter(RevenueWithdrawalState.class, new RevenueWithdrawalStateTypeAdapter())
             .registerTypeAdapter(TransactionPartner.class, TransactionPartnerTypeAdapter.INSTANCE)
             .registerTypeAdapter(PaidMedia.class, new PaidMediaTypeAdapter())
+            .registerTypeAdapter(OwnedGift.class, new OwnedGiftTypeAdapter())
             .setFieldNamingPolicy(FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES)
             .create();
 

library/src/main/java/com/pengrad/telegrambot/utility/gson/OwnedGiftTypeAdapter.java

@@ -0,0 +1,30 @@
+package com.pengrad.telegrambot.utility.gson;
+
+import com.google.gson.*;
+import com.pengrad.telegrambot.model.gift.owned.OwnedGift;
+import com.pengrad.telegrambot.model.gift.owned.OwnedGiftRegular;
+import com.pengrad.telegrambot.model.gift.owned.OwnedGiftUnique;
+import com.pengrad.telegrambot.model.paidmedia.PaidMedia;
+import com.pengrad.telegrambot.model.paidmedia.PaidMediaPhoto;
+import com.pengrad.telegrambot.model.paidmedia.PaidMediaPreview;
+import com.pengrad.telegrambot.model.paidmedia.PaidMediaVideo;
+
+import java.lang.reflect.Type;
+
+public class OwnedGiftTypeAdapter implements JsonDeserializer<OwnedGift> {
+
+    @Override
+    public OwnedGift deserialize(JsonElement element, Type type, JsonDeserializationContext context) throws JsonParseException {
+        JsonObject object = element.getAsJsonObject();
+        JsonPrimitive primitive = object.getAsJsonPrimitive("type");
+        String discriminator = primitive != null ? primitive.getAsString() : "unknown";
+
+        if (OwnedGiftRegular.TYPE.equals(discriminator)) {
+            return context.deserialize(object, OwnedGiftRegular.class);
+        } else if (OwnedGiftUnique.TYPE.equals(discriminator)) {
+            return context.deserialize(object, OwnedGiftUnique.class);
+        }
+
+        return new OwnedGift(discriminator);
+    }
+}