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/* @test
   @bug 6945316
   @summary The Win32ShellFolderManager2.isFileSystemRoot can throw NPE
   @author Pavel Porvatov
   @modules java.desktop/sun.awt
            java.desktop/sun.awt.shell
   @run main bug6945316
*/

import sun.awt.OSInfo;
import sun.awt.shell.ShellFolder;

import java.awt.*;
import java.io.File;
import java.util.concurrent.CountDownLatch;

public class bug6945316 {
    public static void main(String[] args) throws Exception {
        if (OSInfo.getOSType() != OSInfo.OSType.WINDOWS) {
            System.out.println("The test is suitable only for Windows OS. Skipped.");

            return;
        }

        // Init toolkit because it shouldn't be interrupted while initialization
        Toolkit.getDefaultToolkit();

        // Init the sun.awt.shell.Win32ShellFolderManager2.drives field
        ShellFolder.get("fileChooserComboBoxFolders");

        // To get NPE the path must obey the following rules:
        // path.length() == 3 && path.charAt(1) == ':'
        final File tempFile = new File("c:\\");

        for (int i = 0; i < 10000; i++) {
            final CountDownLatch countDownLatch = new CountDownLatch(1);

            final Thread thread = new Thread() {
                public void run() {
                    countDownLatch.countDown();

                    ShellFolder.isFileSystemRoot(tempFile);
                }
            };

            thread.start();

            countDownLatch.await();

            thread.interrupt();
        }
    }
}