1 /*
   2  * Copyright (c) 2013, 2014, 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 package sun.swing;
  26 
  27 import javax.swing.AbstractListModel;
  28 import javax.swing.ComboBoxModel;
  29 import javax.swing.JFileChooser;
  30 import javax.swing.filechooser.FileFilter;
  31 import java.beans.PropertyChangeEvent;
  32 import java.beans.PropertyChangeListener;
  33 
  34 /**
  35  * Data model for a type-face selection combo-box.
  36  */
  37 @SuppressWarnings("serial") // JDK-implementation class
  38 public abstract class AbstractFilterComboBoxModel
  39         extends AbstractListModel<FileFilter>
  40         implements ComboBoxModel<FileFilter>, PropertyChangeListener {
  41 
  42     protected FileFilter[] filters;
  43 
  44     protected AbstractFilterComboBoxModel() {
  45         this.filters = getFileChooser().getChoosableFileFilters();
  46     }
  47 
  48     protected abstract JFileChooser getFileChooser();
  49 
  50     @Override
  51     public void propertyChange(PropertyChangeEvent event) {
  52         String property = event.getPropertyName();
  53         if (property == JFileChooser.CHOOSABLE_FILE_FILTER_CHANGED_PROPERTY) {
  54             this.filters = (FileFilter[]) event.getNewValue();
  55             fireContentsChanged(this, -1, -1);
  56         } else if (property == JFileChooser.FILE_FILTER_CHANGED_PROPERTY) {
  57             fireContentsChanged(this, -1, -1);
  58         }
  59     }
  60 
  61     @Override
  62     public void setSelectedItem(Object filter) {
  63         if (filter != null) {
  64             getFileChooser().setFileFilter((FileFilter) filter);
  65             fireContentsChanged(this, -1, -1);
  66         }
  67     }
  68 
  69     @Override
  70     public Object getSelectedItem() {
  71         // Ensure that the current filter is in the list.
  72         // NOTE: we should not have to do this, since JFileChooser adds
  73         // the filter to the choosable filters list when the filter
  74         // is set. Lets be paranoid just in case someone overrides
  75         // setFileFilter in JFileChooser.
  76         FileFilter currentFilter = getFileChooser().getFileFilter();
  77         if (currentFilter != null) {
  78             for (FileFilter filter : this.filters) {
  79                 if (filter == currentFilter) {
  80                     return currentFilter;
  81                 }
  82             }
  83             getFileChooser().addChoosableFileFilter(currentFilter);
  84         }
  85         return currentFilter;
  86     }
  87 
  88     @Override
  89     public int getSize() {
  90         return (this.filters != null)
  91                 ? filters.length
  92                 : 0;
  93     }
  94 
  95     @Override
  96     public FileFilter getElementAt(int index) {
  97         if (index >= getSize()) {
  98             // This shouldn't happen. Try to recover gracefully.
  99             return getFileChooser().getFileFilter();
 100         }
 101         return (this.filters != null)
 102                 ? filters[index]
 103                 : null;
 104     }
 105 }