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   *  distributed with this work for additional information
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   *  to you under the Apache License, Version 2.0 (the
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  package org.apache.cayenne.modeler.action;
  
  import org.apache.cayenne.configuration.DataChannelDescriptor;
  import org.apache.cayenne.configuration.DataNodeDescriptor;
  import org.apache.cayenne.configuration.event.DataNodeEvent;
  import org.apache.cayenne.map.DataMap;
  import org.apache.cayenne.modeler.Application;
  import org.apache.cayenne.modeler.ProjectController;
  import org.apache.cayenne.modeler.undo.LinkDataMapUndoableEdit;
  import org.apache.cayenne.modeler.util.CayenneAction;
  
  import java.awt.event.ActionEvent;
  import java.util.ArrayList;
  import java.util.Collection;
  
  public class LinkDataMapAction extends CayenneAction {
  
      public static String getActionName() {
          return "Link DataMap";
      }
  
      /**
       * Constructor for LinkDataMapAction.
       *
       * @param application
       */
      public LinkDataMapAction(Application application) {
          super(getActionName(), application);
      }
  
      public void linkDataMap(DataMap map, DataNodeDescriptor node) {
          if (map == null) {
              return;
          }
  
          // no change?
          if (node != null && node.getDataMapNames().contains(map.getName())) {
              return;
          }
  
          ProjectController mediator = getProjectController();
          DataChannelDescriptor dataChannelDescriptor = (DataChannelDescriptor) mediator.getProject().getRootNode();
          Collection<DataNodeDescriptor> unlinkedNodes = new ArrayList<>();
  
          // unlink map from any nodes
          // Theoretically only one node may contain a datamap at each given time.
          // Being paranoid, we will still scan through all.
          for (DataNodeDescriptor nextNode : dataChannelDescriptor.getNodeDescriptors()) {
              if (nextNode.getDataMapNames().contains(map.getName())) {
                  nextNode.getDataMapNames().remove(map.getName());
                  mediator.fireDataNodeEvent(new DataNodeEvent(this, nextNode));
                  unlinkedNodes.add(nextNode);
              }
          }
  
          // link to a selected node
          if (node != null) {
              node.getDataMapNames().add(map.getName());
  
              // announce DataNode change
              mediator.fireDataNodeEvent(new DataNodeEvent(this, node));
          }
  
          application.getUndoManager().addEdit(
                  new LinkDataMapUndoableEdit(map, node, unlinkedNodes, mediator));
      }
  
      @Override
      public void performAction(ActionEvent e) {
  
      }
  }