1 /*
   2  * Copyright (c) 2019, 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 javax.swing.filechooser;
  27 
  28 import java.awt.Image;
  29 import javax.swing.Icon;
  30 import javax.swing.ImageIcon;
  31 import javax.swing.JFileChooser;
  32 import javax.swing.UIManager;
  33 import sun.awt.shell.ShellFolder;
  34 import java.io.File;
  35 import java.io.FileNotFoundException;
  36 
  37 /**
  38  * SystemIcon is JFileChooser's gateway to the
  39  * file system icons.
  40  *
  41  * <p>
  42  *
  43  * @author shashidhara
  44  */
  45 public class SystemIcon {
  46 
  47    /**
  48     * Icon for a file, directory, or folder as it would be displayed in
  49     * a system file browser for the requested size.
  50     *
  51     * The default implementation gets information from the ShellFolder class.
  52     *
  53     * @param f a <code>File</code> object
  54     * @param size width and height of the icon in pixels to be scaled(valid range: 1 to 256)
  55     * @return an icon as it would be displayed by a native file chooser
  56     * @see JFileChooser#getIcon
  57     * @since 12
  58     */
  59     static public Icon getSystemIcon(File f, int size) {
  60        if (f == null) {
  61            return null;
  62        }
  63 
  64        if (size > 256 || size < 1) {
  65            return null;
  66        }
  67 
  68        ShellFolder sf;
  69        try {
  70            sf = ShellFolder.getShellFolder(f);
  71        } catch (FileNotFoundException e) {
  72            return null;
  73        } catch (InternalError e) {
  74             System.err.println("FileSystemView.getShellFolder: f="+f);
  75             e.printStackTrace();
  76             return null;
  77        }
  78 
  79        Image img = sf.getIcon(size);
  80        if (img != null) {
  81            return new ImageIcon(img, sf.getFolderType());
  82        } else {
  83            return UIManager.getIcon(f.isDirectory() ? "FileView.directoryIcon" : "FileView.fileIcon");
  84        }
  85     }
  86 }