content: package act.db;
  
  /*-
   * #%L
   * ACT Framework
   * %%
   * Copyright (C) 2014 - 2017 ActFramework
   * %%
   * 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.
   * #L%
   */
  
  import act.app.App;
  import act.inject.param.NoBind;
  import org.osgl.$;
  import org.osgl.util.E;
  import org.osgl.util.Generics;
  import org.osgl.util.S;
  
  import java.lang.reflect.Type;
  import java.util.List;
  
  /**
   * The model base class
   * @param <MODEL_TYPE> the generic type of Model class
   * @param <ID_TYPE> the generic type of the ID (Key)
   */
  @NoBind
  public abstract class ModelBase<ID_TYPE, MODEL_TYPE extends ModelBase>
  implements Model<ID_TYPE, MODEL_TYPE> {
  
      protected transient Type idType;
      protected transient Type modelType;
  
      public ModelBase() {
          exploreTypes();
      }
  
      // for JSON deserialization
      public ID_TYPE getId() {
          return _id();
      }
  
      // for JSON deserialization
      public void setId(ID_TYPE id) {
          _id(id);
      }
  
      protected Class<ID_TYPE> idType() {
          return Generics.classOf(idType);
      }
  
      protected Class<MODEL_TYPE> modelType() {
          return Generics.classOf(modelType);
      }
  
      /**
       * Returns a {@link Dao} object that can operate on this entity of
       * the entities with the same type.
       *
       * <p>Note this method needs to be enhanced by framework to be called</p>
       *
       * @return the {@code Dao} object
       */
      public static <T extends Dao>
      T dao() {
          throw E.unsupport("Please make sure you have Entity annotation tagged on your model class");
      }
  
      /**
       * Returns a {@link Dao} object that can operate on this entity of
       * the entities with the same type.
       *
       * <p>Note this method needs to be enhanced by framework to be called</p>
       *
       * @return the {@code Dao} object
       */
      public static <T extends Dao>
      T dao(Class<T> cls) {
          throw E.unsupport("Please make sure you have Entity annotation tagged on your model class");
      }
  
      @Override
      public int hashCode() {
          return $.hc(getClass(), _id());
      }
  
      @Override
      public boolean equals(Object obj) {
          if (obj == this) {
              return true;
          }
          if ($.eq(obj.getClass(), getClass())) {
              Model that = (Model) obj;
              return $.eq(that._id(), this._id());
          }
          return false;
      }
  
      @Override
      public String toString() {
          return S.concat(getClass().getName(), "[", S.string(getId()), "]");
      }
  
  
      protected final MODEL_TYPE _me() {
          return (MODEL_TYPE)this;
      }
  
      private void exploreTypes() {
          List<Type> types = Generics.typeParamImplementations(getClass(), ModelBase.class);
          int sz = types.size();
          if (sz < 1) {
              return;
          }
          if (sz > 1) {
              modelType = types.get(1);
          }
          idType = types.get(0);
      }
  }
  