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    1   /*
    2    * Copyright (c) 2000, 2009, Oracle and/or its affiliates. All rights reserved.
    3    * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
    4    *
    5    * This code is free software; you can redistribute it and/or modify it
    6    * under the terms of the GNU General Public License version 2 only, as
    7    * published by the Free Software Foundation.  Oracle designates this
    8    * particular file as subject to the "Classpath" exception as provided
    9    * by Oracle in the LICENSE file that accompanied this code.
   10    *
   11    * This code is distributed in the hope that it will be useful, but WITHOUT
   12    * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   13    * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
   14    * version 2 for more details (a copy is included in the LICENSE file that
   15    * accompanied this code).
   16    *
   17    * You should have received a copy of the GNU General Public License version
   18    * 2 along with this work; if not, write to the Free Software Foundation,
   19    * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   20    *
   21    * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
   22    * or visit www.oracle.com if you need additional information or have any
   23    * questions.
   24    */
   25   
   26   package sun.awt.shell;
   27   
   28   import java.io.File;
   29   import java.io.FileNotFoundException;
   30   import java.util.concurrent.Callable;
   31   
   32   /**
   33    * @author Michael Martak
   34    * @since 1.4
   35    */
   36   
   37   class ShellFolderManager {
   38       /**
   39        * Create a shell folder from a file.
   40        * Override to return machine-dependent behavior.
   41        */
   42       public ShellFolder createShellFolder(File file) throws FileNotFoundException {
   43           return new DefaultShellFolder(null, file);
   44       }
   45   
   46       /**
   47        * @param key a <code>String</code>
   48        *  "fileChooserDefaultFolder":
   49        *    Returns a <code>File</code> - the default shellfolder for a new filechooser
   50        *  "roots":
   51        *    Returns a <code>File[]</code> - containing the root(s) of the displayable hieararchy
   52        *  "fileChooserComboBoxFolders":
   53        *    Returns a <code>File[]</code> - an array of shellfolders representing the list to
   54        *    show by default in the file chooser's combobox
   55        *   "fileChooserShortcutPanelFolders":
   56        *    Returns a <code>File[]</code> - an array of shellfolders representing well-known
   57        *    folders, such as Desktop, Documents, History, Network, Home, etc.
   58        *    This is used in the shortcut panel of the filechooser on Windows 2000
   59        *    and Windows Me.
   60        *  "fileChooserIcon <icon>":
   61        *    Returns an <code>Image</code> - icon can be ListView, DetailsView, UpFolder, NewFolder or
   62        *    ViewMenu (Windows only).
   63        *
   64        * @return An Object matching the key string.
   65        */
   66       public Object get(String key) {
   67           if (key.equals("fileChooserDefaultFolder")) {
   68               // Return the default shellfolder for a new filechooser
   69               File homeDir = new File(System.getProperty("user.home"));
   70               try {
   71                   return createShellFolder(homeDir);
   72               } catch (FileNotFoundException e) {
   73                   return homeDir;
   74               }
   75           } else if (key.equals("roots")) {
   76               // The root(s) of the displayable hieararchy
   77               return File.listRoots();
   78           } else if (key.equals("fileChooserComboBoxFolders")) {
   79               // Return an array of ShellFolders representing the list to
   80               // show by default in the file chooser's combobox
   81               return get("roots");
   82           } else if (key.equals("fileChooserShortcutPanelFolders")) {
   83               // Return an array of ShellFolders representing well-known
   84               // folders, such as Desktop, Documents, History, Network, Home, etc.
   85               // This is used in the shortcut panel of the filechooser on Windows 2000
   86               // and Windows Me
   87               return new File[] { (File)get("fileChooserDefaultFolder") };
   88           }
   89           return null;
   90       }
   91   
   92       /**
   93        * Does <code>dir</code> represent a "computer" such as a node on the network, or
   94        * "My Computer" on the desktop.
   95        */
   96       public boolean isComputerNode(File dir) {
   97           return false;
   98       }
   99   
  100       public boolean isFileSystemRoot(File dir) {
  101           if (dir instanceof ShellFolder && !((ShellFolder) dir).isFileSystem()) {
  102               return false;
  103           }
  104           return (dir.getParentFile() == null);
  105       }
  106   
  107       protected ShellFolder.Invoker createInvoker() {
  108           return new DirectInvoker();
  109       }
  110   
  111       private static class DirectInvoker implements ShellFolder.Invoker {
  112           public <T> T invoke(Callable<T> task) throws Exception {
  113               return task.call();
  114           }
  115       }
  116   }

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