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1   /***
2    * Redistribution  and use  in source  and binary  forms, with  or without
3    * modification, are permitted provided  that the following conditions are
4    * met :
5    *
6    * . Redistributions  of  source  code  must  retain  the  above copyright
7    *   notice, this list of conditions and the following disclaimer.
8    *
9    * . Redistributions in  binary form  must reproduce  the above  copyright
10   *   notice, this list of conditions  and the following disclaimer in  the
11   *   documentation and/or other materials provided with the distribution.
12   *
13   * . The name of the author may not be used to endorse or promote products
14   *   derived from this software without specific prior written permission.
15   *
16   * THIS SOFTWARE IS  PROVIDED BY THE  AUTHOR ``AS IS''  AND ANY EXPRESS  OR
17   * IMPLIED  WARRANTIES,  INCLUDING,  BUT   NOT  LIMITED  TO,  THE   IMPLIED
18   * WARRANTIES OF MERCHANTABILITY AND  FITNESS FOR A PARTICULAR  PURPOSE ARE
19   * DISCLAIMED.  IN NO  EVENT SHALL  THE AUTHOR  BE LIABLE  FOR ANY  DIRECT,
20   * INDIRECT,  INCIDENTAL,  SPECIAL,  EXEMPLARY,  OR  CONSEQUENTIAL  DAMAGES
21   * (INCLUDING,  BUT  NOT LIMITED  TO,  PROCUREMENT OF  SUBSTITUTE  GOODS OR
22   * SERVICES;  LOSS  OF USE,  DATA,  OR PROFITS;  OR  BUSINESS INTERRUPTION)
23   * HOWEVER CAUSED  AND ON  ANY THEORY  OF LIABILITY,  WHETHER IN  CONTRACT,
24   * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
25   * ANY  WAY  OUT OF  THE  USE OF  THIS  SOFTWARE, EVEN  IF  ADVISED OF  THE
26   * POSSIBILITY OF SUCH DAMAGE.
27   *
28   * $Id: FileOverwriteListener.java 359 2005-12-23 14:26:53Z mat007 $
29   */
30  
31  package palmed;
32  
33  import javax.microedition.lcdui.Display;
34  import javax.microedition.lcdui.Displayable;
35  import palmed.file.IFile;
36  import palmed.file.IFileBrowserListener;
37  import palmed.ui.ConfirmationDialog;
38  import palmed.ui.IConfirmationListener;
39  
40  /***
41   * This class wraps a file browser listener to prompt the user for confirmation.
42   *
43   * @author Mathieu Champlon
44   * @version $Revision: 359 $ $Date: 2005-12-23 23:26:53 +0900 (ven., 23 déc. 2005) $
45   */
46  public final class FileOverwriteListener implements IFileBrowserListener
47  {
48      /***
49       * The confirmation dialog title.
50       */
51      private static final String TITLE = "File Overwrite Confirmation";
52      /***
53       * The confirmation dialog question.
54       */
55      private static final String QUESTION = "Are you sure you want to overwrite it ?";
56      /***
57       * The display.
58       */
59      private final Display display_;
60      /***
61       * The displayable to show upon cancelation.
62       */
63      private final Displayable next_;
64      /***
65       * The wrapped listener.
66       */
67      private final IFileBrowserListener listener_;
68  
69      /***
70       * Create a file overwrite listener.
71       *
72       * @param display the display
73       * @param next the displayable to show upon cancelation
74       * @param listener the wrapped listener
75       */
76      public FileOverwriteListener( final Display display, final Displayable next, final IFileBrowserListener listener )
77      {
78          if( display == null )
79              throw new IllegalArgumentException( "parameter 'display' is null" );
80          if( next == null )
81              throw new IllegalArgumentException( "parameter 'next' is null" );
82          if( listener == null )
83              throw new IllegalArgumentException( "parameter 'listener' is null" );
84          display_ = display;
85          next_ = next;
86          listener_ = listener;
87      }
88  
89      /***
90       * {@inheritDoc}
91       */
92      public void select( final IFile file )
93      {
94          if( !file.exists() )
95              listener_.select( file );
96          else
97          {
98              final IConfirmationListener listener = new IConfirmationListener()
99              {
100                 public void accept()
101                 {
102                     listener_.select( file );
103                 }
104 
105                 public void refuse()
106                 {
107                     display_.setCurrent( next_ );
108                 }
109             };
110             final String description = "The file " + file.toString() + " already exists.";
111             display_.setCurrent( new ConfirmationDialog( TITLE, description, QUESTION, listener ) );
112         }
113     }
114 }