content: /*
   * Created on Aug 6, 2009
   * 
   * 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.
   * 
   * Copyright @2009-2013 the original author or authors.
   */
  package org.fest.swing.driver;
  
  import static org.fest.util.Lists.newArrayList;
  
  import java.util.List;
  
  import javax.annotation.Nonnull;
  import javax.swing.JTree;
  import javax.swing.tree.TreePath;
  
  import org.fest.swing.annotation.RunsInCurrentThread;
  
  /**
   * <p>
   * Adds the root node of a {@code JTree} to a given path if such root is invisible.
   * </p>
   * 
   * <p>
   * <b>Note:</b> Methods in this class are accessed in the current executing thread. Such thread may or may not be the
   * event dispatch thread (EDT.) Client code must call methods in this class from the EDT.
   * </p>
   *
   * @author Alex Ruiz
   */
  final class JTreeAddRootIfInvisibleTask {
    /*
     * Adds the root node to the path, only if the JTree has an invisible root. If this is not done, a path missing the
     * root node cannot be expanded (issue 293.)
     */
    @RunsInCurrentThread
    static @Nonnull TreePath addRootIfInvisible(@Nonnull JTree tree, @Nonnull TreePath path) {
      Object root = tree.getModel().getRoot();
      if (tree.isRootVisible() || root == null) {
        return path;
      }
      // root is invisible but path already contains root
      if (path.getPathCount() > 0 && root == path.getPathComponent(0)) {
        return path;
      }
      Object[] pathAsArray = path.getPath();
      if (pathAsArray == null) {
        return new TreePath(newArrayList(root));
      }
      List<Object> newPath = newArrayList(pathAsArray);
      newPath.add(0, root);
      return new TreePath(newPath.toArray());
    }
  
    private JTreeAddRootIfInvisibleTask() {}
  }
  