/*

 * Copyright (c) 2000, 2013, 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 sun.awt.shell;

import java.io.File;

import java.io.FileNotFoundException;

import java.util.concurrent.Callable;

/**

 * @author Michael Martak

 * @since 1.4

 */

class ShellFolderManager {

    /**

     * Create a shell folder from a file.

     * Override to return machine-dependent behavior.

     */

    public ShellFolder createShellFolder(File file) throws FileNotFoundException {

        return new DefaultShellFolder(null, file);

    }

    /**

     * @param key a <code>String</code>

     *  "fileChooserDefaultFolder":

     *    Returns a <code>File</code> - the default shellfolder for a new filechooser

     *  "roots":

     *    Returns a <code>File[]</code> - containing the root(s) of the displayable hierarchy

     *  "fileChooserComboBoxFolders":

     *    Returns a <code>File[]</code> - an array of shellfolders representing the list to

     *    show by default in the file chooser's combobox

     *   "fileChooserShortcutPanelFolders":

     *    Returns a <code>File[]</code> - an array of shellfolders representing well-known

     *    folders, such as Desktop, Documents, History, Network, Home, etc.

     *    This is used in the shortcut panel of the filechooser on Windows 2000

     *    and Windows Me.

     *  "fileChooserIcon <icon>":

     *    Returns an <code>Image</code> - icon can be ListView, DetailsView, UpFolder, NewFolder or

     *    ViewMenu (Windows only).

     *

     * @return An Object matching the key string.

     */

    public Object get(String key) {

        if (key.equals("fileChooserDefaultFolder")) {

            // Return the default shellfolder for a new filechooser

            File homeDir = new File(System.getProperty("user.home"));

            try {

                return createShellFolder(homeDir);

            } catch (FileNotFoundException e) {

                return homeDir;

            }

        } else if (key.equals("roots")) {

            // The root(s) of the displayable hierarchy

            return File.listRoots();

        } else if (key.equals("fileChooserComboBoxFolders")) {

            // Return an array of ShellFolders representing the list to

            // show by default in the file chooser's combobox

            return get("roots");

        } else if (key.equals("fileChooserShortcutPanelFolders")) {

            // Return an array of ShellFolders representing well-known

            // folders, such as Desktop, Documents, History, Network, Home, etc.

            // This is used in the shortcut panel of the filechooser on Windows 2000

            // and Windows Me

            return new File[] { (File)get("fileChooserDefaultFolder") };

        }

        return null;

    }

    /**

     * Does <code>dir</code> represent a "computer" such as a node on the network, or

     * "My Computer" on the desktop.

     */

    public boolean isComputerNode(File dir) {

        return false;

    }

    public boolean isFileSystemRoot(File dir) {

        if (dir instanceof ShellFolder && !((ShellFolder) dir).isFileSystem()) {

            return false;

        }

        return (dir.getParentFile() == null);

    }

    protected ShellFolder.Invoker createInvoker() {

        return new DirectInvoker();

    }

    private static class DirectInvoker implements ShellFolder.Invoker {

        public <T> T invoke(Callable<T> task) throws Exception {

            return task.call();

        }

    }

}