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   *  or more contributor license agreements.  See the NOTICE file
   *  distributed with this work for additional information
   *  regarding copyright ownership.  The ASF 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
   *
   *    https://www.apache.org/licenses/LICENSE-2.0
   *
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   *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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  package org.apache.cayenne.modeler.util.state;
  
  import org.apache.cayenne.configuration.DataChannelDescriptor;
  import org.apache.cayenne.configuration.DataNodeDescriptor;
  import org.apache.cayenne.map.DataMap;
  import org.apache.cayenne.map.DbEntity;
  import org.apache.cayenne.map.Entity;
  import org.apache.cayenne.map.ObjEntity;
  import org.apache.cayenne.modeler.ProjectController;
  import org.apache.cayenne.modeler.event.EntityDisplayEvent;
  
  class EntityDisplayEventType extends DisplayEventType {
  
      EntityDisplayEventType(ProjectController controller) {
          super(controller);
      }
  
      @Override
      public void fireLastDisplayEvent() {
          DataChannelDescriptor dataChannel = (DataChannelDescriptor) controller.getProject().getRootNode();
          if (!dataChannel.getName().equals(preferences.getDomain())) {
              return;
          }
  
          DataNodeDescriptor dataNode = dataChannel.getNodeDescriptor(preferences.getNode());
          DataMap dataMap = dataChannel.getDataMap(preferences.getDataMap());
          if (dataMap == null) {
              return;
          }
  
          Entity<?,?,?> entity = getLastEntity(dataMap);
          if (entity == null) {
              return;
          }
  
          EntityDisplayEvent entityDisplayEvent = new EntityDisplayEvent(this, entity, dataMap, dataNode, dataChannel);
          if (entity instanceof ObjEntity) {
              controller.fireObjEntityDisplayEvent(entityDisplayEvent);
          } else if (entity instanceof DbEntity) {
              controller.fireDbEntityDisplayEvent(entityDisplayEvent);
          }
      }
  
      @Override
      public void saveLastDisplayEvent() {
          preferences.setEvent(EntityDisplayEvent.class.getSimpleName());
          preferences.setDomain(controller.getCurrentDataChanel().getName());
          preferences.setNode(controller.getCurrentDataNode() != null ? controller.getCurrentDataNode().getName() : "");
          preferences.setDataMap(controller.getCurrentDataMap().getName());
  
          if (controller.getCurrentObjEntity() != null) {
              preferences.setObjEntity(controller.getCurrentObjEntity().getName());
              preferences.setDbEntity(null);
          } else if (controller.getCurrentDbEntity() != null) {
              preferences.setDbEntity(controller.getCurrentDbEntity().getName());
              preferences.setObjEntity(null);
          }
      }
  
      Entity<?,?,?> getLastEntity(DataMap dataMap) {
          return !preferences.getObjEntity().isEmpty()
                  ? dataMap.getObjEntity(preferences.getObjEntity())
                  : dataMap.getDbEntity(preferences.getDbEntity());
      }
  }
  