content: package act.db.meta;
  
  /*-
   * #%L
   * ACT Framework
   * %%
   * Copyright (C) 2014 - 2018 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.app.event.SysEventId;
  import act.asm.Type;
  import act.db.DB;
  import act.job.JobManager;
  import act.util.ClassInfoRepository;
  import org.osgl.util.C;
  import org.osgl.util.E;
  
  import java.lang.annotation.Annotation;
  import java.util.*;
  import javax.inject.Inject;
  import javax.inject.Singleton;
  import javax.persistence.*;
  
  @Singleton
  public class MasterEntityMetaInfoRepo extends EntityMetaInfoRepo {
  
      private static EntityMetaInfoRepo EMPTY;
  
      // map entity meta info repo to db id
      private Map<String, EntityMetaInfoRepo> regions = new HashMap<>();
  
      private Set<String> entityAnnotations = new HashSet<>();
      private Set<String> mappedSuperClassAnnotations = new HashSet<>();
      private Set<String> entityListenerAnnotations = new HashSet<>();
      private String defaultAlias;
  
      @Inject
      public MasterEntityMetaInfoRepo(final App app) {
          super(app);
          EMPTY = new EntityMetaInfoRepo(app){
              @Override
              public void registerEntityOrMappedSuperClass(String className) {
                  E.unsupport();
              }
  
              @Override
              public void registerEntityName(String className, String entityName) {
                  E.unsupport();
              }
  
              @Override
              public void markEntityListenersFound(String className) {
                  E.unsupport();
              }
  
              @Override
              public void registerCreatedAtField(String className, String fieldName) {
                  E.unsupport();
              }
  
              @Override
              public void registerLastModifiedAtField(String className, String fieldName) {
                  E.unsupport();
              }
  
              @Override
              public void registerIdField(String className, String fieldName) {
                  E.unsupport();
              }
  
              @Override
              public void registerColumnName(String className, String fieldName, String columnName) {
                  E.unsupport();
              }
  
              @Override
              public boolean isRegistered(String className) {
                  return false;
              }
  
              @Override
              public Set<Class> entityClasses() {
                  return C.Set();
              }
  
              @Override
              public EntityClassMetaInfo classMetaInfo(Class<?> entityClass) {
                  return null;
              }
  
              @Override
              public EntityClassMetaInfo classMetaInfo(String className) {
                  return null;
              }
  
              @Override
              protected void releaseResources() {
              }
  
              @Override
              void register(Class<?> entityClass, EntityClassMetaInfo info) {
                  E.unsupport();
              }
          };
          registerEntityAnnotation(Entity.class);
          registerMappedSuperClassAnnotation(MappedSuperclass.class);
          registerEntityListenerAnnotation(EntityListeners.class);
          final MasterEntityMetaInfoRepo me = this;
          JobManager jobManager = app.jobManager();
          jobManager.on(SysEventId.CLASS_LOADED, "MasterEntityMetaInfoRepo:findAndRegisterEntityClasses", new Runnable() {
              @Override
              public void run() {
                  final ClassInfoRepository classRepo = app.classLoader().classInfoRepository();
                  for (Map.Entry<String, EntityClassMetaInfo> entry : lookup.entrySet()) {
                      Class<?> entityClass = app.classForName(entry.getKey());
                      EntityClassMetaInfo info = entry.getValue();
                      info.mergeFromMappedSuperClasses(classRepo, me);
                      register(entityClass, info);
                      DB db = entityClass.getAnnotation(DB.class);
                      String dbId = (null == db ? DB.DEFAULT : db.value()).toUpperCase();
                      EntityMetaInfoRepo repo = regions.get(dbId);
                      if (null == repo) {
                          repo = new EntityMetaInfoRepo(app);
                          regions.put(dbId, repo);
                      }
                      repo.register(entityClass, info);
                  }
              }
          });
          jobManager.on(SysEventId.DEPENDENCY_INJECTOR_PROVISIONED, "MasterEntityMetaInfoRepo:registerEntityMetaInfoRepo.Provider", new Runnable() {
              @Override
              public void run() {
                  app.injector().registerNamedProvider(EntityMetaInfoRepo.class, app.getInstance(EntityMetaInfoRepo.Provider.class));
              }
          });
      }
  
      public void registerEntityAnnotation(Class<? extends Annotation> annoType) {
          entityAnnotations.add(Type.getType(annoType).getDescriptor());
      }
  
      public void registerMappedSuperClassAnnotation(Class<? extends Annotation> annoType) {
          mappedSuperClassAnnotations.add(Type.getType(annoType).getDescriptor());
      }
  
      public void registerEntityListenerAnnotation(Class<? extends Annotation> annoType) {
          entityListenerAnnotations.add(Type.getType(annoType).getDescriptor());
      }
  
      public void setDefaultAlias(String defaultAlias) {
          this.defaultAlias = defaultAlias;
      }
  
  
      public boolean isEntity(String descriptor) {
          return entityAnnotations.contains(descriptor);
      }
  
      public boolean isMappedSuperClass(String descriptor) {
          return mappedSuperClassAnnotations.contains(descriptor);
      }
  
      public boolean isEntityListener(String descriptor) {
          return entityListenerAnnotations.contains(descriptor);
      }
  
      public EntityMetaInfoRepo forDefaultDb() {
          return forDb(DB.DEFAULT);
      }
  
      public EntityMetaInfoRepo forDb(String dbId) {
          final String DEF = DB.DEFAULT.toUpperCase();
          if (null == dbId) {
              dbId = DEF;
          } else {
              dbId = dbId.toUpperCase();
          }
          EntityMetaInfoRepo repo = regions.get(dbId);
          if (null == repo && null != defaultAlias) {
              final String DEF_ALIAS = defaultAlias.toUpperCase();
              if (DEF.equals(dbId)) {
                  dbId = DEF_ALIAS;
              } else if (DEF_ALIAS.equals(dbId)) {
                  dbId = DEF;
              }
              repo = regions.get(dbId);
          }
          return null != repo ? repo : EMPTY;
      }
  
      public Iterable<EntityMetaInfoRepo> allRepos() {
          return regions.values();
      }
  
      public static EntityMetaInfoRepo EMPTY() {
          return EMPTY;
      }
  }
  