content: /*
   * Copyright 2021-2024 Aklivity Inc.
   *
   * Aklivity licenses this file to you 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 io.aklivity.zilla.runtime.engine.config;
  
  import static java.util.function.Function.identity;
  import static java.util.stream.Collectors.toMap;
  
  import java.util.Map;
  import java.util.ServiceLoader;
  import java.util.function.Supplier;
  
  import jakarta.json.Json;
  import jakarta.json.JsonObject;
  import jakarta.json.JsonString;
  import jakarta.json.JsonValue;
  import jakarta.json.bind.adapter.JsonbAdapter;
  
  public final class ModelConfigAdapter implements JsonbAdapter<ModelConfig, JsonValue>
  {
      private static final String MODEL_NAME = "model";
  
      private final Map<String, ModelConfigAdapterSpi> delegatesByName;
      private ModelConfigAdapterSpi delegate;
  
      public ModelConfigAdapter()
      {
          delegatesByName = ServiceLoader
              .load(ModelConfigAdapterSpi.class)
              .stream()
              .map(Supplier::get)
              .collect(toMap(ModelConfigAdapterSpi::type, identity()));
      }
  
      public void adaptType(
          String type)
      {
          delegate = delegatesByName.get(type);
      }
  
      @Override
      public JsonValue adaptToJson(
          ModelConfig options)
      {
          return delegate != null ? delegate.adaptToJson(options) : null;
      }
  
      @Override
      public ModelConfig adaptFromJson(
          JsonValue value)
      {
          JsonObject object = null;
          if (value instanceof JsonString)
          {
              object = Json.createObjectBuilder()
                  .add(MODEL_NAME, ((JsonString) value).getString())
                  .build();
          }
          else if (value instanceof JsonObject)
          {
              object = (JsonObject) value;
          }
          else
          {
              assert false;
          }
  
          String type = object.containsKey(MODEL_NAME)
                  ? object.getString(MODEL_NAME)
                  : null;
  
          adaptType(type);
  
          return delegate != null ? delegate.adaptFromJson(object) : null;
      }
  }
  