gt:         if(rootPane != null) {
context: /*
   * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this
   * particular file as subject to the "Classpath" exception as provided
   * by Oracle in the LICENSE file that accompanied this code.
   *
   * This code is distributed in the hope that it will be useful, but WITHOUT
   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
   * version 2 for more details (a copy is included in the LICENSE file that
   * accompanied this code).
   *
   * You should have received a copy of the GNU General Public License version
   * 2 along with this work; if not, write to the Free Software Foundation,
   * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
   * or visit www.oracle.com if you need additional information or have any
   * questions.
   */
  package javax.swing;
  
  import java.awt.AWTEvent;
  import java.awt.BorderLayout;
  import java.awt.Component;
  import java.awt.Container;
  import java.awt.Frame;
  import java.awt.Graphics;
  import java.awt.GraphicsConfiguration;
  import java.awt.HeadlessException;
  import java.awt.Image;
  import java.awt.LayoutManager;
  import java.awt.event.WindowEvent;
  
  import javax.accessibility.Accessible;
  import javax.accessibility.AccessibleContext;
  import javax.accessibility.AccessibleState;
  import javax.accessibility.AccessibleStateSet;
  
  
  /**
   * An extended version of <code>java.awt.Frame</code> that adds support for
   * the JFC/Swing component architecture.
   * You can find task-oriented documentation about using <code>JFrame</code>
   * in <em>The Java Tutorial</em>, in the section
   * <a
   href="http://docs.oracle.com/javase/tutorial/uiswing/components/frame.html">How to Make Frames</a>.
   *
   * <p>
   * The <code>JFrame</code> class is slightly incompatible with <code>Frame</code>.
   * Like all other JFC/Swing top-level containers,
   * a <code>JFrame</code> contains a <code>JRootPane</code> as its only child.
   * The <b>content pane</b> provided by the root pane should,
   * as a rule, contain
   * all the non-menu components displayed by the <code>JFrame</code>.
   * This is different from the AWT <code>Frame</code> case.
   * As a convenience, the {@code add}, {@code remove}, and {@code setLayout}
   * methods of this class are overridden, so that they delegate calls
   * to the corresponding methods of the {@code ContentPane}.
   * For example, you can add a child component to a frame as follows:
   * <pre>
   *       frame.add(child);
   * </pre>
   * And the child will be added to the contentPane.
   * The content pane will
   * always be non-null. Attempting to set it to null will cause the JFrame
   * to throw an exception. The default content pane will have a BorderLayout
   * manager set on it.
   * Refer to {@link javax.swing.RootPaneContainer}
   * for details on adding, removing and setting the <code>LayoutManager</code>
   * of a <code>JFrame</code>.
   * <p>
   * Unlike a <code>Frame</code>, a <code>JFrame</code> has some notion of how to
   * respond when the user attempts to close the window. The default behavior
   * is to simply hide the JFrame when the user closes the window. To change the
   * default behavior, you invoke the method
   * {@link #setDefaultCloseOperation}.
   * To make the <code>JFrame</code> behave the same as a <code>Frame</code>
   * instance, use
   * <code>setDefaultCloseOperation(WindowConstants.DO_NOTHING_ON_CLOSE)</code>.
   * <p>
   * For more information on content panes
   * and other features that root panes provide,
   * see <a
   href="http://docs.oracle.com/javase/tutorial/uiswing/components/toplevel.html">Using Top-Level Containers</a> in <em>The Java Tutorial</em>.
   * <p>
   * In a multi-screen environment, you can create a <code>JFrame</code>
   * on a different screen device.  See {@link java.awt.Frame} for more
   * information.
   * <p>
   * <strong>Warning:</strong> Swing is not thread safe. For more
   * information see <a
   * href="package-summary.html#threading">Swing's Threading
   * Policy</a>.
   * <p>
   * <strong>Warning:</strong>
   * Serialized objects of this class will not be compatible with
   * future Swing releases. The current serialization support is
   * appropriate for short term storage or RMI between applications running
   * the same version of Swing.  As of 1.4, support for long term storage
   * of all JavaBeans&trade;
   * has been added to the <code>java.beans</code> package.
   * Please see {@link java.beans.XMLEncoder}.
   *
   * @see JRootPane
   * @see #setDefaultCloseOperation
   * @see java.awt.event.WindowListener#windowClosing
   * @see javax.swing.RootPaneContainer
   *
   * @beaninfo
   *      attribute: isContainer true
   *      attribute: containerDelegate getContentPane
   *    description: A toplevel window which can be minimized to an icon.
   *
   * @author Jeff Dinkins
   * @author Georges Saab
   * @author David Kloba
   * @since 1.2
   */
  @SuppressWarnings("serial") // Same-version serialization only
  public class JFrame  extends Frame implements WindowConstants,
                                                Accessible,
                                                RootPaneContainer,
                                TransferHandler.HasGetTransferHandler
  {
      /**
       * Key into the AppContext, used to check if should provide decorations
       * by default.
       */
      private static final Object defaultLookAndFeelDecoratedKey =
              new StringBuffer("JFrame.defaultLookAndFeelDecorated");
  
      private int defaultCloseOperation = HIDE_ON_CLOSE;
  
      /**
       * The <code>TransferHandler</code> for this frame.
       */
      private TransferHandler transferHandler;
  
      /**
       * The <code>JRootPane</code> instance that manages the
       * <code>contentPane</code>
       * and optional <code>menuBar</code> for this frame, as well as the
       * <code>glassPane</code>.
       *
       * @see JRootPane
       * @see RootPaneContainer
       */
      protected JRootPane rootPane;
  
      /**
       * If true then calls to <code>add</code> and <code>setLayout</code>
       * will be forwarded to the <code>contentPane</code>. This is initially
       * false, but is set to true when the <code>JFrame</code> is constructed.
       *
       * @see #isRootPaneCheckingEnabled
       * @see #setRootPaneCheckingEnabled
       * @see javax.swing.RootPaneContainer
       */
      protected boolean rootPaneCheckingEnabled = false;
  
  
      /**
       * Constructs a new frame that is initially invisible.
       * <p>
       * This constructor sets the component's locale property to the value
       * returned by <code>JComponent.getDefaultLocale</code>.
       *
       * @exception HeadlessException if GraphicsEnvironment.isHeadless()
       * returns true.
       * @see java.awt.GraphicsEnvironment#isHeadless
       * @see Component#setSize
       * @see Component#setVisible
       * @see JComponent#getDefaultLocale
       */
      public JFrame() throws HeadlessException {
          super();
          frameInit();
      }
  
      /**
       * Creates a <code>Frame</code> in the specified
       * <code>GraphicsConfiguration</code> of
       * a screen device and a blank title.
       * <p>
       * This constructor sets the component's locale property to the value
       * returned by <code>JComponent.getDefaultLocale</code>.
       *
       * @param gc the <code>GraphicsConfiguration</code> that is used
       *          to construct the new <code>Frame</code>;
       *          if <code>gc</code> is <code>null</code>, the system
       *          default <code>GraphicsConfiguration</code> is assumed
       * @exception IllegalArgumentException if <code>gc</code> is not from
       *          a screen device.  This exception is always thrown when
       *      GraphicsEnvironment.isHeadless() returns true.
       * @see java.awt.GraphicsEnvironment#isHeadless
       * @see JComponent#getDefaultLocale
       * @since     1.3
       */
      public JFrame(GraphicsConfiguration gc) {
          super(gc);
          frameInit();
      }
  
      /**
       * Creates a new, initially invisible <code>Frame</code> with the
       * specified title.
       * <p>
       * This constructor sets the component's locale property to the value
       * returned by <code>JComponent.getDefaultLocale</code>.
       *
       * @param title the title for the frame
       * @exception HeadlessException if GraphicsEnvironment.isHeadless()
       * returns true.
       * @see java.awt.GraphicsEnvironment#isHeadless
       * @see Component#setSize
       * @see Component#setVisible
       * @see JComponent#getDefaultLocale
       */
      public JFrame(String title) throws HeadlessException {
          super(title);
          frameInit();
      }
  
      /**
       * Creates a <code>JFrame</code> with the specified title and the
       * specified <code>GraphicsConfiguration</code> of a screen device.
       * <p>
       * This constructor sets the component's locale property to the value
       * returned by <code>JComponent.getDefaultLocale</code>.
       *
       * @param title the title to be displayed in the
       *          frame's border. A <code>null</code> value is treated as
       *          an empty string, "".
       * @param gc the <code>GraphicsConfiguration</code> that is used
       *          to construct the new <code>JFrame</code> with;
       *          if <code>gc</code> is <code>null</code>, the system
       *          default <code>GraphicsConfiguration</code> is assumed
       * @exception IllegalArgumentException if <code>gc</code> is not from
       *          a screen device.  This exception is always thrown when
       *      GraphicsEnvironment.isHeadless() returns true.
       * @see java.awt.GraphicsEnvironment#isHeadless
       * @see JComponent#getDefaultLocale
       * @since     1.3
       */
      public JFrame(String title, GraphicsConfiguration gc) {
          super(title, gc);
          frameInit();
      }
  
      /** Called by the constructors to init the <code>JFrame</code> properly. */
      protected void frameInit() {
          enableEvents(AWTEvent.KEY_EVENT_MASK | AWTEvent.WINDOW_EVENT_MASK);
          setLocale( JComponent.getDefaultLocale() );
          setRootPane(createRootPane());
          setBackground(UIManager.getColor("control"));
          setRootPaneCheckingEnabled(true);
          if (JFrame.isDefaultLookAndFeelDecorated()) {
              boolean supportsWindowDecorations =
              UIManager.getLookAndFeel().getSupportsWindowDecorations();
              if (supportsWindowDecorations) {
                  setUndecorated(true);
                  getRootPane().setWindowDecorationStyle(JRootPane.FRAME);
              }
          }
          sun.awt.SunToolkit.checkAndSetPolicy(this);
      }
  
      /**
       * Called by the constructor methods to create the default
       * <code>rootPane</code>.
       *
       * @return a new {@code JRootPane}
       */
      protected JRootPane createRootPane() {
          JRootPane rp = new JRootPane();
          // NOTE: this uses setOpaque vs LookAndFeel.installProperty as there
          // is NO reason for the RootPane not to be opaque. For painting to
          // work the contentPane must be opaque, therefor the RootPane can
          // also be opaque.
          rp.setOpaque(true);
          return rp;
      }
  
      /**
       * Processes window events occurring on this component.
       * Hides the window or disposes of it, as specified by the setting
       * of the <code>defaultCloseOperation</code> property.
       *
       * @param  e  the window event
       * @see    #setDefaultCloseOperation
       * @see    java.awt.Window#processWindowEvent
       */
      protected void processWindowEvent(final WindowEvent e) {
          super.processWindowEvent(e);
  
          if (e.getID() == WindowEvent.WINDOW_CLOSING) {
              switch (defaultCloseOperation) {
                  case HIDE_ON_CLOSE:
                      setVisible(false);
                      break;
                  case DISPOSE_ON_CLOSE:
                      dispose();
                      break;
                  case EXIT_ON_CLOSE:
                      // This needs to match the checkExit call in
                      // setDefaultCloseOperation
                      System.exit(0);
                      break;
                  case DO_NOTHING_ON_CLOSE:
                  default:
              }
          }
      }
  
      /**
       * Sets the operation that will happen by default when
       * the user initiates a "close" on this frame.
       * You must specify one of the following choices:
       * <br><br>
       * <ul>
       * <li><code>DO_NOTHING_ON_CLOSE</code>
       * (defined in <code>WindowConstants</code>):
       * Don't do anything; require the
       * program to handle the operation in the <code>windowClosing</code>
       * method of a registered <code>WindowListener</code> object.
       *
       * <li><code>HIDE_ON_CLOSE</code>
       * (defined in <code>WindowConstants</code>):
       * Automatically hide the frame after
       * invoking any registered <code>WindowListener</code>
       * objects.
       *
       * <li><code>DISPOSE_ON_CLOSE</code>
       * (defined in <code>WindowConstants</code>):
       * Automatically hide and dispose the
       * frame after invoking any registered <code>WindowListener</code>
       * objects.
       *
       * <li><code>EXIT_ON_CLOSE</code>
       * (defined in <code>WindowConstants</code>):
       * Exit the application using the <code>System</code>
       * <code>exit</code> method.  Use this only in applications.
       * </ul>
       * <p>
       * The value is set to <code>HIDE_ON_CLOSE</code> by default. Changes
       * to the value of this property cause the firing of a property
       * change event, with property name "defaultCloseOperation".
       * <p>
       * <b>Note</b>: When the last displayable window within the
       * Java virtual machine (VM) is disposed of, the VM may
       * terminate.  See <a href="../../java/awt/doc-files/AWTThreadIssues.html">
       * AWT Threading Issues</a> for more information.
       *
       * @param operation the operation which should be performed when the
       *        user closes the frame
       * @exception IllegalArgumentException if defaultCloseOperation value
       *             isn't one of the above valid values
       * @see #addWindowListener
       * @see #getDefaultCloseOperation
       * @see WindowConstants
       * @throws  SecurityException
       *        if <code>EXIT_ON_CLOSE</code> has been specified and the
       *        <code>SecurityManager</code> will
       *        not allow the caller to invoke <code>System.exit</code>
       * @see        java.lang.Runtime#exit(int)
       *
       * @beaninfo
       *   preferred: true
       *       bound: true
       *        enum: DO_NOTHING_ON_CLOSE WindowConstants.DO_NOTHING_ON_CLOSE
       *              HIDE_ON_CLOSE       WindowConstants.HIDE_ON_CLOSE
       *              DISPOSE_ON_CLOSE    WindowConstants.DISPOSE_ON_CLOSE
       *              EXIT_ON_CLOSE       WindowConstants.EXIT_ON_CLOSE
       * description: The frame's default close operation.
       */
      public void setDefaultCloseOperation(int operation) {
          if (operation != DO_NOTHING_ON_CLOSE &&
              operation != HIDE_ON_CLOSE &&
              operation != DISPOSE_ON_CLOSE &&
              operation != EXIT_ON_CLOSE) {
              throw new IllegalArgumentException("defaultCloseOperation must be"
                      + " one of: DO_NOTHING_ON_CLOSE, HIDE_ON_CLOSE,"
                      + " DISPOSE_ON_CLOSE, or EXIT_ON_CLOSE");
          }
  
          if (operation == EXIT_ON_CLOSE) {
              SecurityManager security = System.getSecurityManager();
              if (security != null) {
                  security.checkExit(0);
              }
          }
          if (this.defaultCloseOperation != operation) {
              int oldValue = this.defaultCloseOperation;
              this.defaultCloseOperation = operation;
              firePropertyChange("defaultCloseOperation", oldValue, operation);
          }
      }
  
  
     /**
      * Returns the operation that occurs when the user
      * initiates a "close" on this frame.
      *
      * @return an integer indicating the window-close operation
      * @see #setDefaultCloseOperation
      */
      public int getDefaultCloseOperation() {
          return defaultCloseOperation;
      }
  
      /**
       * Sets the {@code transferHandler} property, which is a mechanism to
       * support transfer of data into this component. Use {@code null}
       * if the component does not support data transfer operations.
       * <p>
       * If the system property {@code suppressSwingDropSupport} is {@code false}
       * (the default) and the current drop target on this component is either
       * {@code null} or not a user-set drop target, this method will change the
       * drop target as follows: If {@code newHandler} is {@code null} it will
       * clear the drop target. If not {@code null} it will install a new
       * {@code DropTarget}.
       * <p>
       * Note: When used with {@code JFrame}, {@code TransferHandler} only
       * provides data import capability, as the data export related methods
       * are currently typed to {@code JComponent}.
       * <p>
       * Please see
       * <a href="http://docs.oracle.com/javase/tutorial/uiswing/dnd/index.html">
       * How to Use Drag and Drop and Data Transfer</a>, a section in
       * <em>The Java Tutorial</em>, for more information.
       *
       * @param newHandler the new {@code TransferHandler}
       *
       * @see TransferHandler
       * @see #getTransferHandler
       * @see java.awt.Component#setDropTarget
       * @since 1.6
       *
       * @beaninfo
       *        bound: true
       *       hidden: true
       *  description: Mechanism for transfer of data into the component
       */
      public void setTransferHandler(TransferHandler newHandler) {
          TransferHandler oldHandler = transferHandler;
          transferHandler = newHandler;
          SwingUtilities.installSwingDropTargetAsNecessary(this, transferHandler);
          firePropertyChange("transferHandler", oldHandler, newHandler);
      }
  
      /**
       * Gets the <code>transferHandler</code> property.
       *
       * @return the value of the <code>transferHandler</code> property
       *
       * @see TransferHandler
       * @see #setTransferHandler
       * @since 1.6
       */
      public TransferHandler getTransferHandler() {
          return transferHandler;
      }
  
      /**
       * Just calls <code>paint(g)</code>.  This method was overridden to
       * prevent an unnecessary call to clear the background.
       *
       * @param g the Graphics context in which to paint
       */
      public void update(Graphics g) {
          paint(g);
      }
  
     /**
      * Sets the menubar for this frame.
      * @param menubar the menubar being placed in the frame
      *
      * @see #getJMenuBar
      *
      * @beaninfo
      *      hidden: true
      * description: The menubar for accessing pulldown menus from this frame.
      */
      @SuppressWarnings("deprecation")
      public void setJMenuBar(JMenuBar menubar) {
          getRootPane().setMenuBar(menubar);
      }
  
     /**
      * Returns the menubar set on this frame.
      * @return the menubar for this frame
      *
      * @see #setJMenuBar
      */
      @SuppressWarnings("deprecation")
      public JMenuBar getJMenuBar() {
          return getRootPane().getMenuBar();
      }
  
      /**
       * Returns whether calls to <code>add</code> and
       * <code>setLayout</code> are forwarded to the <code>contentPane</code>.
       *
       * @return true if <code>add</code> and <code>setLayout</code>
       *         are forwarded; false otherwise
       *
       * @see #addImpl
       * @see #setLayout
       * @see #setRootPaneCheckingEnabled
       * @see javax.swing.RootPaneContainer
       */
      protected boolean isRootPaneCheckingEnabled() {
          return rootPaneCheckingEnabled;
      }
  
  
      /**
       * Sets whether calls to <code>add</code> and
       * <code>setLayout</code> are forwarded to the <code>contentPane</code>.
       *
       * @param enabled  true if <code>add</code> and <code>setLayout</code>
       *        are forwarded, false if they should operate directly on the
       *        <code>JFrame</code>.
       *
       * @see #addImpl
       * @see #setLayout
       * @see #isRootPaneCheckingEnabled
       * @see javax.swing.RootPaneContainer
       * @beaninfo
       *      hidden: true
       * description: Whether the add and setLayout methods are forwarded
       */
      protected void setRootPaneCheckingEnabled(boolean enabled) {
          rootPaneCheckingEnabled = enabled;
      }
  
  
      /**
       * Adds the specified child <code>Component</code>.
       * This method is overridden to conditionally forward calls to the
       * <code>contentPane</code>.
       * By default, children are added to the <code>contentPane</code> instead
       * of the frame, refer to {@link javax.swing.RootPaneContainer} for
       * details.
       *
       * @param comp the component to be enhanced
       * @param constraints the constraints to be respected
       * @param index the index
       * @exception IllegalArgumentException if <code>index</code> is invalid
       * @exception IllegalArgumentException if adding the container's parent
       *                  to itself
       * @exception IllegalArgumentException if adding a window to a container
       *
       * @see #setRootPaneCheckingEnabled
       * @see javax.swing.RootPaneContainer
       */
      protected void addImpl(Component comp, Object constraints, int index)
      {
          if(isRootPaneCheckingEnabled()) {
              getContentPane().add(comp, constraints, index);
          }
          else {
              super.addImpl(comp, constraints, index);
          }
      }
  
      /**
       * Removes the specified component from the container. If
       * <code>comp</code> is not the <code>rootPane</code>, this will forward
       * the call to the <code>contentPane</code>. This will do nothing if
       * <code>comp</code> is not a child of the <code>JFrame</code> or
       * <code>contentPane</code>.
       *
       * @param comp the component to be removed
       * @throws NullPointerException if <code>comp</code> is null
       * @see #add
       * @see javax.swing.RootPaneContainer
       */
      public void remove(Component comp) {
          if (comp == rootPane) {
              super.remove(comp);
          } else {
              getContentPane().remove(comp);
          }
      }
  
  
      /**
       * Sets the <code>LayoutManager</code>.
       * Overridden to conditionally forward the call to the
       * <code>contentPane</code>.
       * Refer to {@link javax.swing.RootPaneContainer} for
       * more information.
       *
       * @param manager the <code>LayoutManager</code>
       * @see #setRootPaneCheckingEnabled
       * @see javax.swing.RootPaneContainer
       */
      public void setLayout(LayoutManager manager) {
          if(isRootPaneCheckingEnabled()) {
              getContentPane().setLayout(manager);
          }
          else {
              super.setLayout(manager);
          }
      }
  
  
      /**
       * Returns the <code>rootPane</code> object for this frame.
       * @return the <code>rootPane</code> property
       *
       * @see #setRootPane
       * @see RootPaneContainer#getRootPane
       */
      public JRootPane getRootPane() {
          return rootPane;
      }
  
  
      /**
       * Sets the <code>rootPane</code> property.
       * This method is called by the constructor.
       * @param root the <code>rootPane</code> object for this frame
       *
       * @see #getRootPane
       *
       * @beaninfo
       *   hidden: true
       * description: the RootPane object for this frame.
       */
      protected void setRootPane(JRootPane root)
      {
  