Add TransactionPartnerTelegramApi transaction partner, rewrite Transa…

…ctionPartnerTypeAdapter to kotlin

library/src/main/java/com/pengrad/telegrambot/model/stars/partner/TransactionPartnerTelegramApi.java

@@ -0,0 +1,39 @@
+package com.pengrad.telegrambot.model.stars.partner;
+
+import java.util.Objects;
+
+public class TransactionPartnerTelegramApi extends TransactionPartner {
+
+    public final static String TYPE = "telegram_api";
+
+    private Integer request_count;
+
+    public TransactionPartnerTelegramApi() {
+        super(TYPE);
+    }
+
+    public Integer requestCount() {
+        return request_count;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (!(o instanceof TransactionPartnerTelegramApi)) return false;
+        if (!super.equals(o)) return false;
+        TransactionPartnerTelegramApi that = (TransactionPartnerTelegramApi) o;
+        return Objects.equals(request_count, that.request_count);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(super.hashCode(), request_count);
+    }
+
+    @Override
+    public String toString() {
+        return "TransactionPartnerTelegramApi{" +
+            "request_count=" + request_count +
+            '}';
+    }
+}

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

@@ -36,7 +36,7 @@ private BotUtils() {}
             .registerTypeAdapter(BackgroundType.class, new BackgroundTypeAdapter())
             .registerTypeAdapter(BackgroundFill.class, new BackgroundFillAdapter())
             .registerTypeAdapter(RevenueWithdrawalState.class, new RevenueWithdrawalStateTypeAdapter())
-            .registerTypeAdapter(TransactionPartner.class, new TransactionPartnerTypeAdapter())
+            .registerTypeAdapter(TransactionPartner.class, TransactionPartnerTypeAdapter.INSTANCE)
             .registerTypeAdapter(PaidMedia.class, new PaidMediaTypeAdapter())
             .setFieldNamingPolicy(FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES)
             .create();

library/src/main/java/com/pengrad/telegrambot/utility/gson/TransactionPartnerTypeAdapter.kt

@@ -0,0 +1,31 @@
+package com.pengrad.telegrambot.utility.gson
+
+import com.google.gson.*
+import com.pengrad.telegrambot.model.stars.partner.*
+import java.lang.reflect.Type
+
+object TransactionPartnerTypeAdapter : JsonDeserializer<TransactionPartner> {
+
+    private val typeMapping = mapOf(
+        TransactionPartnerUser.TYPE to TransactionPartnerUser::class,
+        TransactionPartnerFragment.TYPE to TransactionPartnerFragment::class,
+        TransactionPartnerTelegramAds.TYPE to TransactionPartnerTelegramAds::class,
+        TransactionPartnerTelegramApi.TYPE to TransactionPartnerTelegramApi::class,
+        TransactionPartnerOther.TYPE to TransactionPartnerOther::class
+    )
+
+    @Throws(JsonParseException::class)
+    override fun deserialize(
+        element: JsonElement,
+        type: Type,
+        context: JsonDeserializationContext
+    ): TransactionPartner {
+        val obj = element.asJsonObject
+        val discriminator = obj.getAsJsonPrimitive("type")?.asString ?: "unknown"
+
+        return typeMapping[discriminator]?.let {
+            context.deserialize(obj, it.java)
+        } ?: TransactionPartner(discriminator)
+    }
+
+}