Use EventGsonProvider instance from gerrit core

The version of EventGsonProvider is identical except of EventSerializer
registerTypeAdapter. Serialization java-class-instance -> JSON will
work, because the Gerrit events already have the right class instances.

Change-Id: I357033ec4c35a490b62b9ec722fe6c2958c29c26

src/main/java/com/gerritforge/gerrit/eventbroker/EventGsonProvider.java

diff --git a/src/main/java/com/gerritforge/gerrit/eventbroker/EventGsonProvider.java b/src/main/java/com/gerritforge/gerrit/eventbroker/EventGsonProvider.java
deleted file mode 100644
index be548fa..0000000
--- a/src/main/java/com/gerritforge/gerrit/eventbroker/EventGsonProvider.java
+++ /dev/null
@@ -1,84 +0,0 @@
-// Copyright (C) 2019 The Android Open Source Project
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package com.gerritforge.gerrit.eventbroker;
-
-import com.google.common.base.Supplier;
-import com.google.gerrit.entities.EntitiesAdapterFactory;
-import com.google.gerrit.entities.Project;
-import com.google.gerrit.server.events.Event;
-import com.google.gerrit.server.events.EventDeserializer;
-import com.google.gerrit.server.events.EventTypes;
-import com.google.gerrit.server.events.ProjectNameKeyAdapter;
-import com.google.gerrit.server.events.SupplierDeserializer;
-import com.google.gerrit.server.events.SupplierSerializer;
-import com.google.gson.Gson;
-import com.google.gson.GsonBuilder;
-import com.google.gson.JsonDeserializationContext;
-import com.google.gson.JsonDeserializer;
-import com.google.gson.JsonElement;
-import com.google.gson.JsonParseException;
-import com.google.gson.JsonPrimitive;
-import com.google.gson.JsonSerializationContext;
-import com.google.gson.JsonSerializer;
-import com.google.inject.Provider;
-import java.lang.reflect.Type;
-
-public class EventGsonProvider implements Provider<Gson> {
-
-  public static class EventSerializer implements JsonSerializer<Event> {
-
-    @Override
-    public JsonElement serialize(Event src, Type typeOfSrc, JsonSerializationContext context) {
-      String type = src.getType();
-
-      Class<?> cls = EventTypes.getClass(type);
-      if (cls == null) {
-        throw new JsonParseException("Unknown event type: " + type);
-      }
-
-      return context.serialize(src, cls);
-    }
-  }
-
-  public static class ProjectNameKeyDeserializer implements JsonDeserializer<Project.NameKey> {
-
-    @Override
-    public Project.NameKey deserialize(
-        JsonElement json, Type type, JsonDeserializationContext context) throws JsonParseException {
-      if (!json.isJsonPrimitive()) {
-        throw new JsonParseException("Not a primitive type");
-      }
-
-      JsonPrimitive jsonPrimitive = (JsonPrimitive) json;
-      if (!jsonPrimitive.isString()) {
-        throw new JsonParseException("Not a string");
-      }
-
-      return Project.nameKey(jsonPrimitive.getAsString());
-    }
-  }
-
-  @Override
-  public Gson get() {
-    return new GsonBuilder()
-        .registerTypeAdapter(Event.class, new EventDeserializer())
-        .registerTypeAdapter(Event.class, new EventSerializer())
-        .registerTypeAdapter(Supplier.class, new SupplierSerializer())
-        .registerTypeAdapter(Supplier.class, new SupplierDeserializer())
-        .registerTypeAdapter(Project.NameKey.class, new ProjectNameKeyAdapter())
-        .registerTypeAdapterFactory(EntitiesAdapterFactory.create())
-        .create();
-  }
-}