/* * Copyright (c) 2022, 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. * * 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. */ import java.awt.BorderLayout; import java.awt.Component; import java.awt.Container; import java.awt.Robot; import java.io.File; import java.util.function.Predicate; import javax.swing.JComboBox; import javax.swing.JFileChooser; import javax.swing.JFrame; import javax.swing.SwingUtilities; import javax.swing.UIManager; import javax.swing.UnsupportedLookAndFeelException; import javax.swing.WindowConstants; import javax.swing.filechooser.FileView; import javax.swing.plaf.metal.MetalLookAndFeel; /* * @test * @bug 6616245 * @key headful * @summary Test to check if NPE occurs when using custom FileView. * @run main FileViewNPETest */ public class FileViewNPETest { private static JFrame frame; private static JFileChooser jfc; private static File path; public static void main(String[] args) throws Exception { final Robot robot = new Robot(); try { SwingUtilities.invokeAndWait(FileViewNPETest::initialize); robot.waitForIdle(); SwingUtilities.invokeAndWait(() -> { jfc.setCurrentDirectory(path.getParentFile()); if (null != jfc.getCurrentDirectory()) { // The current directory to become null because // the parent directory is not traversable throw new RuntimeException("Current directory is not null"); } }); robot.waitForIdle(); SwingUtilities.invokeAndWait(() -> { JComboBox dirs = findDirectoryComboBox(jfc); // No NPE is expected dirs.setSelectedIndex(dirs.getSelectedIndex()); if (!jfc.getCurrentDirectory().equals(path)) { throw new RuntimeException("The current directory is not restored"); } }); } finally { SwingUtilities.invokeAndWait(() -> { if (frame != null) { frame.dispose(); } }); } } private static void initialize() { try { UIManager.setLookAndFeel(new MetalLookAndFeel()); } catch (UnsupportedLookAndFeelException e) { throw new RuntimeException(e); } String userHome = System.getProperty("user.home"); String docs = userHome + File.separator + "Documents"; path = new File((new File(docs).exists()) ? docs : userHome); jfc = new JFileChooser(); jfc.setCurrentDirectory(path); jfc.setFileView(new CustomFileView(path.getPath())); jfc.setControlButtonsAreShown(false); frame = new JFrame("JFileChooser FileView NPE test"); frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); frame.add(jfc, BorderLayout.CENTER); frame.pack(); frame.setLocationRelativeTo(null); frame.setVisible(true); } private static JComboBox findDirectoryComboBox(final Container container) { Component result = findComponent(container, c -> c instanceof JComboBox); return (JComboBox) result; } private static Component findComponent(final Container container, final Predicate predicate) { for (Component child : container.getComponents()) { if (predicate.test(child)) { return child; } if (child instanceof Container cont && cont.getComponentCount() > 0) { Component result = findComponent(cont, predicate); if (result != null) { return result; } } } return null; } } class CustomFileView extends FileView { private final String basePath; public CustomFileView(String path) { basePath = path; } @Override public Boolean isTraversable(File filePath) { return ((filePath != null) && (filePath.isDirectory())) && filePath.getAbsolutePath().startsWith(basePath); } }