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Bybit Linear Java API

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package io.contek.invoker.bybitlinear.api.websocket;

import com.google.gson.Gson;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import io.contek.invoker.bybitlinear.api.websocket.common.WebSocketOperationResponse;
import io.contek.invoker.bybitlinear.api.websocket.common.WebSocketTopicMessage;
import io.contek.invoker.bybitlinear.api.websocket.market.OrderBookChannel;
import io.contek.invoker.commons.websocket.AnyWebSocketMessage;
import io.contek.invoker.commons.websocket.IWebSocketComponent;
import io.contek.invoker.commons.websocket.WebSocketTextMessageParser;

import javax.annotation.concurrent.ThreadSafe;
import java.util.HashMap;
import java.util.Map;

import static io.contek.invoker.bybitlinear.api.websocket.common.constants.WebSocketDataMessageTypeKeys._delta;
import static io.contek.invoker.bybitlinear.api.websocket.common.constants.WebSocketDataMessageTypeKeys._snapshot;

@ThreadSafe
final class WebSocketMessageParser extends WebSocketTextMessageParser {

  private final Gson gson = new Gson();

  private final Map> channelMessageTypes =
      new HashMap<>();

  @Override
  public void register(IWebSocketComponent component) {
    if (!(component instanceof WebSocketChannel channel)) {
      return;
    }
    synchronized (channelMessageTypes) {
      channelMessageTypes.put(channel.getId().getTopic(), channel.getMessageType());
    }
  }

  @Override
  protected AnyWebSocketMessage fromText(String text) {
    JsonElement json = gson.fromJson(text, JsonElement.class);
    if (!json.isJsonObject()) {
      throw new IllegalArgumentException(text);
    }
    JsonObject obj = json.getAsJsonObject();
    if (obj.has("request")) {
      return toOperationResponse(obj);
    }
    if (obj.has("topic")) {
      return toTopicMessage(obj);
    }
    throw new IllegalArgumentException(text);
  }

  private AnyWebSocketMessage toTopicMessage(JsonObject obj) {
    String topic = obj.get("topic").getAsString();
    synchronized (channelMessageTypes) {
      Class type = channelMessageTypes.get(topic);
      if (type == null) {
        throw new IllegalArgumentException(topic);
      }

      if (type.equals(OrderBookChannel.Message.class)) {
        return switch (obj.get("type").getAsString()) {
          case _snapshot -> gson.fromJson(obj, OrderBookChannel.SnapshotMessage.class);
          case _delta -> gson.fromJson(obj, OrderBookChannel.DeltaMessage.class);
          default -> throw new IllegalStateException();
        };
      }

      return gson.fromJson(obj, type);
    }
  }

  private WebSocketOperationResponse toOperationResponse(JsonObject obj) {
    return gson.fromJson(obj, WebSocketOperationResponse.class);
  }
}