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   *  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
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  package org.apache.cayenne.modeler.util.state;
  
  import org.apache.cayenne.configuration.DataChannelDescriptor;
  import org.apache.cayenne.map.DataMap;
  import org.apache.cayenne.map.Embeddable;
  import org.apache.cayenne.map.EmbeddableAttribute;
  import org.apache.cayenne.modeler.ProjectController;
  import org.apache.cayenne.modeler.event.EmbeddableAttributeDisplayEvent;
  import org.apache.cayenne.modeler.event.EmbeddableDisplayEvent;
  
  import java.util.ArrayList;
  import java.util.List;
  
  class EmbeddableAttributeDisplayEventType extends EmbeddableDisplayEventType {
  
      public EmbeddableAttributeDisplayEventType(ProjectController controller) {
          super(controller);
      }
  
      @Override
      public void fireLastDisplayEvent() {
          DataChannelDescriptor dataChannel = (DataChannelDescriptor) controller.getProject().getRootNode();
          if (!dataChannel.getName().equals(preferences.getDomain())) {
              return;
          }
  
          DataMap dataMap = dataChannel.getDataMap(preferences.getDataMap());
          if (dataMap == null) {
              return;
          }
  
          Embeddable embeddable = dataMap.getEmbeddable(preferences.getEmbeddable());
          if (embeddable == null) {
              return;
          }
  
          EmbeddableDisplayEvent embeddableDisplayEvent = new EmbeddableDisplayEvent(this, embeddable, dataMap, dataChannel);
          controller.fireEmbeddableDisplayEvent(embeddableDisplayEvent);
  
          EmbeddableAttribute[] embeddableAttributes = getLastEmbeddableAttributes(embeddable);
          EmbeddableAttributeDisplayEvent attributeDisplayEvent = new EmbeddableAttributeDisplayEvent(this, embeddable, embeddableAttributes, dataMap, dataChannel);
          controller.fireEmbeddableAttributeDisplayEvent(attributeDisplayEvent);
      }
  
      @Override
      public void saveLastDisplayEvent() {
          preferences.setEvent(EmbeddableAttributeDisplayEvent.class.getSimpleName());
          preferences.setDomain(controller.getCurrentDataChanel().getName());
          preferences.setDataMap(controller.getCurrentDataMap().getName());
          preferences.setEmbeddable(controller.getCurrentEmbeddable().getClassName());
  
          EmbeddableAttribute[] currentEmbAttributes = controller.getCurrentEmbAttributes();
          if (currentEmbAttributes == null) {
              preferences.setEmbAttrs("");
          } else {
              StringBuilder sb = new StringBuilder();
              for (EmbeddableAttribute embeddableAttribute : currentEmbAttributes) {
                  sb.append(embeddableAttribute.getName()).append(",");
              }
              preferences.setEmbAttrs(sb.toString());
          }
      }
  
      protected EmbeddableAttribute[] getLastEmbeddableAttributes(Embeddable embeddable) {
          List<EmbeddableAttribute> embeddableAttributeList = new ArrayList<EmbeddableAttribute>();
          EmbeddableAttribute[] attributes = new EmbeddableAttribute[0];
  
          String embAttrs = preferences.getEmbAttrs();
          if (embAttrs.isEmpty()) {
              return embeddableAttributeList.toArray(attributes);
          }
  
          for (String embAttrName : embAttrs.split(",")) {
              embeddableAttributeList.add(embeddable.getAttribute(embAttrName));
          }
  
          return embeddableAttributeList.toArray(attributes);
      }
  }