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.inject.param.NoBind;
  import act.util.LogSupport;
  import act.util.Stateless;
  import org.osgl.$;
  import org.osgl.util.C;
  import org.osgl.util.Generics;
  
  import java.lang.annotation.Annotation;
  import java.lang.reflect.Type;
  import java.util.List;
  import javax.enterprise.context.ApplicationScoped;
  
  @NoBind
  @Stateless
  public abstract class DaoBase<ID_TYPE, MODEL_TYPE, QUERY_TYPE extends Dao.Query<MODEL_TYPE, QUERY_TYPE>>
          extends LogSupport
          implements Dao<ID_TYPE, MODEL_TYPE, QUERY_TYPE> {
  
      private boolean destroyed;
      protected Type modelType;
      protected Class<MODEL_TYPE> modelClass;
      protected Type idType;
      protected Class<ID_TYPE> idClass;
      protected Type queryType;
      protected Class<QUERY_TYPE> queryClass;
  
      public DaoBase() {
          exploreTypes();
      }
  
      public DaoBase(Class<ID_TYPE> idType, Class<MODEL_TYPE> modelType) {
          this.idType = $.requireNotNull(idType);
          this.idClass = Generics.classOf(idType);
          this.modelType = $.requireNotNull(modelType);
          this.modelClass = Generics.classOf(modelType);
      }
  
      @Override
      public void destroy() {
          if (destroyed) return;
          destroyed = true;
          releaseResources();
      }
  
      @Override
      public Class<ID_TYPE> idType() {
          return idClass;
      }
  
      @Override
      public Class<MODEL_TYPE> modelType() {
          return modelClass;
      }
  
      @Override
      public Class<QUERY_TYPE> queryType() {
          return queryClass;
      }
  
      @Override
      public boolean isDestroyed() {
          return destroyed;
      }
  
      protected void releaseResources() {}
  
      @Override
      public Class<? extends Annotation> scope() {
          return ApplicationScoped.class;
      }
  
      @Override
      public Iterable<MODEL_TYPE> findBy(String fields, Object... values) throws IllegalArgumentException {
          return q(fields, values).fetch();
      }
  
      @Override
      public MODEL_TYPE findOneBy(String fields, Object... values) throws IllegalArgumentException {
          return q(fields, values).first();
      }
  
      @Override
      public Iterable<MODEL_TYPE> findAll() {
          return q().fetch();
      }
  
      @Override
      public List<MODEL_TYPE> findAllAsList() {
          return C.newList(findAll());
      }
  
      @Override
      public long count() {
          return q().count();
      }
  
      @Override
      public long countBy(String fields, Object... values) throws IllegalArgumentException {
          return q(fields, values).count();
      }
  
      private void exploreTypes() {
          List<Type> types = Generics.typeParamImplementations(getClass(), DaoBase.class);
          int sz = types.size();
          if (sz < 1) {
              return;
          }
          if (sz > 2) {
              queryType = types.get(2);
              queryClass = Generics.classOf(queryType);
          }
          if (sz > 1) {
              modelType = types.get(1);
              modelClass = Generics.classOf(modelType);
          }
          idType = types.get(0);
          idClass = Generics.classOf(idType);
      }
  
  }
  