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   *   Licensed to the Apache Software Foundation (ASF) under one
   *  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
   *
   *  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.
   ****************************************************************/
  package org.apache.cayenne.modeler;
  
  import org.apache.cayenne.configuration.DataNodeDescriptor;
  import org.apache.cayenne.map.DataMap;
  import org.apache.cayenne.modeler.action.LinkDataMapAction;
  
  import javax.swing.JTree;
  import javax.swing.tree.DefaultMutableTreeNode;
  import javax.swing.tree.TreePath;
  import java.awt.Point;
  import java.awt.datatransfer.DataFlavor;
  import java.awt.datatransfer.Transferable;
  import java.awt.datatransfer.UnsupportedFlavorException;
  import java.awt.dnd.DropTarget;
  import java.awt.dnd.DropTargetDragEvent;
  import java.awt.dnd.DropTargetDropEvent;
  import java.awt.dnd.DropTargetEvent;
  import java.awt.dnd.DropTargetListener;
  import java.io.IOException;
  
  public class TreeDropTarget implements DropTargetListener, Transferable {
  
      private DropTarget target;
      private JTree targetTree;
      private ProjectController eventController;
      private TreePath parentPath;
      private TreePath targetPath;
  
      public TreeDropTarget(JTree tree, ProjectController eventController, TreePath parentPath) {
          targetTree = tree;
          this.eventController = eventController;
          this.parentPath = parentPath;
          target = new DropTarget(targetTree, this);
      }
  
  
      public void dragEnter(DropTargetDragEvent dtde) {
      }
  
      public void dragOver(DropTargetDragEvent dtde) {
          Point p = dtde.getLocation();
          targetPath = targetTree.getPathForLocation(p.x, p.y);
      }
  
      public void dragExit(DropTargetEvent dte) {
      }
  
      public void dropActionChanged(DropTargetDragEvent dtde) {
      }
  
      public void drop(DropTargetDropEvent dtde) {
          if (targetPath != null) {
              try {
                  dtde.acceptDrop(dtde.getDropAction());
                  DefaultMutableTreeNode target = (DefaultMutableTreeNode) targetPath.getLastPathComponent();
                  DefaultMutableTreeNode parent = (DefaultMutableTreeNode) parentPath.getLastPathComponent();
  
                  if (target.getUserObject() instanceof DataNodeDescriptor && parent.getUserObject() instanceof DataMap) {
                      DataNodeDescriptor currentDataNode = (DataNodeDescriptor) target.getUserObject();
                      DataMap currentDataMap = (DataMap) parent.getUserObject();
  
                      LinkDataMapAction action = eventController.getApplication().getActionManager().getAction(LinkDataMapAction.class);
                      action.linkDataMap(currentDataMap, currentDataNode);
  
                      targetTree.makeVisible(targetPath.pathByAddingChild(target));
                      dtde.dropComplete(true);
                  }
              } catch (Exception e) {
                  e.printStackTrace();
                  dtde.rejectDrop();
              }
          }
  
      }
  
      public TreePath getPath() {
          return this.targetPath;
      }
  
      public Object getTransferData(DataFlavor arg0) throws UnsupportedFlavorException, IOException {
          return null;
      }
  
      public DataFlavor[] getTransferDataFlavors() {
          return null;
      }
  
      public boolean isDataFlavorSupported(DataFlavor arg0) {
          return false;
      }
  }