Example usage for java.io File listRoots

Introduction

In this page you can find the example usage for java.io File listRoots.

Prototype

public static File[] listRoots() 

Source Link

Document

List the available filesystem roots.

Usage

From source file:Main.java

static String getRootDirectoryPath() {
    return File.listRoots().length == 1 ? File.listRoots()[0].getPath().trim() : "";
}

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From source file:Main.java

public static File getLastDirectory() {
    if (lastDirectory == null) {
        String home = System.getProperty("user.home");
        lastDirectory = home != null && !home.isEmpty() ? new File(home) : File.listRoots()[0];
    }/*from   www  .j av a  2  s .  c o m*/
    return lastDirectory;
}

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From source file:Main.java

static String getParentPath(String path) {
    File file = new File(path);
    String parent = file.getParent();
    if (parent == null) {
        File[] roots = File.listRoots();
        for (int i = 0; i < roots.length; i++) {
            if (roots[i].equals(file)) {
                parent = getRootDirectoryPath();
                break;
            }/*from  w ww  .jav a 2  s  .  co m*/
        }
    }
    return parent;
}

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From source file:TestingNonApplication.TestMainNonApp.java

public static void testListRoots() {
    File[] drives = File.listRoots();
    for (File file : drives) {
        System.out.println(file.toString());
        /* Printed out:/*from w ww  .java2 s.co  m*/
         C:\
         D:\
         */
    }
}

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From source file:pl.otros.vfs.browser.favorit.FavoritesUtils.java

public static List<Favorite> getSystemLocations() {
    ArrayList<Favorite> list = new ArrayList<Favorite>();
    File[] listRoots = File.listRoots();
    for (File file : listRoots) {
        list.add(new Favorite(file.getAbsolutePath(), file.getAbsolutePath(), Favorite.Type.SYSTEM));
    }//  w  w w  . java 2  s . c  o  m

    list.add(new Favorite("Home", new File(System.getProperty("user.home")).getAbsolutePath(),
            Favorite.Type.SYSTEM));
    return list;
}

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From source file:TestingNonApplication.TestMainNonApp.java

/**
 * File Testing//from   ww  w  .  j  a v  a  2  s.com
 * -------------------------------------------------------------------
 */
public static void nanoTestFileScane() {
    File[] drives = File.listRoots();

    long startTime1 = System.nanoTime();
    for (File file : drives) {
        hyperAVAJAVAFileMp3Scan(file);
    }
    long estimatedTime1 = System.nanoTime() - startTime1;

    long startTime2 = System.nanoTime();
    for (File file : drives) {
        hyperStackOverflowFileMp3Scan(file);
    }
    long estimatedTime2 = System.nanoTime() - startTime2;

    System.out.println("Estimated time 1: " + estimatedTime1);
    System.out.println("Estimated time 2: " + estimatedTime2);
    long smallestTime = Math.min(estimatedTime1, estimatedTime2);
    System.out.println("Shortest Time: " + smallestTime);
}

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From source file:org.duracloud.syncui.controller.JQueryFileTreeController.java

@RequestMapping(value = { "/ajax/jqueryFileTree" })
public String get(@RequestParam(value = "dir", required = false) String dir, Model model) throws Exception {
    // if blank/*from w  ww  .  j a v a 2  s  .  co m*/
    List<File> children = new ArrayList<File>();
    model.addAttribute("children", children);

    if (StringUtils.isBlank(dir)) {
        File[] roots = File.listRoots();

        // display roots if more than one
        if (roots.length > 1) {
            // otherwise display the list of multiple roots (windows)
            children.addAll(Arrays.asList(roots));
        } else {
            loadChildren(roots[0], children);
        }
    } else {
        if (dir.charAt(dir.length() - 1) == '\\') {
            dir = dir.substring(0, dir.length() - 1) + "/";
        } else if (dir.charAt(dir.length() - 1) != '/') {
            dir += "/";
        }

        dir = java.net.URLDecoder.decode(dir, "UTF-8");
        File directory = new File(dir);
        loadChildren(directory, children);
    }

    return "jqueryFileTree";
}

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From source file:Main.java

/**
 * Does a basic calculation on the number of threads you can concuurently
 * run given the desired Cpu Usage, the Cpu wait time, and the Cpu calc
 * time. For slower threaded tasks, such as downloading large files, etc,
 * you may pass in a large number for cpuWaitTime vs. cpuCalcTime (if
 * processing the of data takes .1 X the time it takes to download for
 * example)//from www . j a  v a 2  s .com
 * 
 * @param cpuUsagePct
 *            a float between 0 and 1
 * @param cpuWaitTime
 *            a float
 * @param cpuCalcTime
 *            a float
 * @return the number of concurrent threads that can run with likely
 *         stability given the parameters.
 */
public static int getStableThreadCount(float cpuUsagePct, float cpuWaitTime, float cpuCalcTime,
        int maxThreads) {

    // number of processor cores
    int cores = Runtime.getRuntime().availableProcessors();

    // number of disks on the file system (known)
    File[] paths;

    // returns pathnames for files and directory
    paths = File.listRoots();
    int disks = paths.length;

    // c can be 0 -> N
    double c = (cpuWaitTime > 0 && cpuCalcTime > 0) ? cpuWaitTime / cpuCalcTime : 0;
    // final thread calculation
    int numThreads = (int) (2 * cores * disks * cpuUsagePct * (1 + c));
    // clamp the max threads between 1 and MAX_THREADS

    numThreads = Math.max(1, numThreads);
    if (maxThreads > 0) {
        numThreads = Math.min(maxThreads, numThreads);
    }

    System.out.println("Getting Stable thread count:" + numThreads);

    return numThreads;
}

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From source file:FileTree2.java

public FileTree2() {
    super("Directories Tree [Popup Menus]");
    setSize(400, 300);/*from w  ww  . j ava2 s .c o m*/

    DefaultMutableTreeNode top = new DefaultMutableTreeNode(new IconData(ICON_COMPUTER, null, "Computer"));

    DefaultMutableTreeNode node;
    File[] roots = File.listRoots();
    for (int k = 0; k < roots.length; k++) {
        node = new DefaultMutableTreeNode(new IconData(ICON_DISK, null, new FileNode(roots[k])));
        top.add(node);
        node.add(new DefaultMutableTreeNode(new Boolean(true)));
    }

    m_model = new DefaultTreeModel(top);
    m_tree = new JTree(m_model);

    m_tree.putClientProperty("JTree.lineStyle", "Angled");

    TreeCellRenderer renderer = new IconCellRenderer();
    m_tree.setCellRenderer(renderer);

    m_tree.addTreeExpansionListener(new DirExpansionListener());

    m_tree.addTreeSelectionListener(new DirSelectionListener());

    m_tree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
    m_tree.setShowsRootHandles(true);
    m_tree.setEditable(false);

    JScrollPane s = new JScrollPane();
    s.getViewport().add(m_tree);
    getContentPane().add(s, BorderLayout.CENTER);

    m_display = new JTextField();
    m_display.setEditable(false);
    getContentPane().add(m_display, BorderLayout.NORTH);

    // NEW
    m_popup = new JPopupMenu();
    m_action = new AbstractAction() {
        public void actionPerformed(ActionEvent e) {
            if (m_clickedPath == null)
                return;
            if (m_tree.isExpanded(m_clickedPath))
                m_tree.collapsePath(m_clickedPath);
            else
                m_tree.expandPath(m_clickedPath);
        }
    };
    m_popup.add(m_action);
    m_popup.addSeparator();

    Action a1 = new AbstractAction("Delete") {
        public void actionPerformed(ActionEvent e) {
            m_tree.repaint();
            JOptionPane.showMessageDialog(FileTree2.this, "Delete option is not implemented", "Info",
                    JOptionPane.INFORMATION_MESSAGE);
        }
    };
    m_popup.add(a1);

    Action a2 = new AbstractAction("Rename") {
        public void actionPerformed(ActionEvent e) {
            m_tree.repaint();
            JOptionPane.showMessageDialog(FileTree2.this, "Rename option is not implemented", "Info",
                    JOptionPane.INFORMATION_MESSAGE);
        }
    };
    m_popup.add(a2);
    m_tree.add(m_popup);
    m_tree.addMouseListener(new PopupTrigger());

    WindowListener wndCloser = new WindowAdapter() {
        public void windowClosing(WindowEvent e) {
            System.exit(0);
        }
    };
    addWindowListener(wndCloser);

    setVisible(true);
}

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From source file:Testing.TestMain.java

public static void testCDrive() {
    //        DirectoryStream directoryStream(directoryStream);
    File cDrive = new File("D:\\");
    File[] drives = File.listRoots();

    for (File drive : drives) {
        for (File rootDirectory : drives) {
            File directory = new File(rootDirectory.getPath());
            System.out.println("PATH: " + directory.toString());
        }/*from w w  w . j a  v  a  2  s .c  o m*/
    }
}

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