/* FileDialog.java -- A filename selection dialog box
   Copyright (C) 1999 Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.

GNU Classpath 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 for more details.

You should have received a copy of the GNU General Public License
along with GNU Classpath; see the file COPYING.  If not, write to the
Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA.

As a special exception, if you link this library with other files to
produce an executable, this library does not by itself cause the
resulting executable to be covered by the GNU General Public License.
This exception does not however invalidate any other reasons why the
executable file might be covered by the GNU General Public License. */


package java.awt;

import java.awt.peer.FileDialogPeer;
import java.awt.peer.DialogPeer;
import java.awt.peer.WindowPeer;
import java.awt.peer.ContainerPeer;
import java.awt.peer.ComponentPeer;
import java.io.FilenameFilter;

/**
  * This class implements a file selection dialog box widget.
  *
  * @author Aaron M. Renn (arenn@urbanophile.com)
  */
public class FileDialog extends Dialog implements java.io.Serializable
{

/*
 * Static Variables
 */

/**
  * Indicates that the purpose of the dialog is for opening a file.
  */
public static final int LOAD = 0;

/**
  * Indicates that the purpose of the dialog is for saving a file.
  */
public static final int SAVE = 1;

// Serialization constant
private static final long serialVersionUID = 5035145889651310422L;

/*************************************************************************/

/*
 * Instance Variables
 */

/**
  * @serial The directory for this file dialog.
  */
private String dir;

/**
  * @serial The filename for this file dialog
  */
private String file;

/**
  * @serial The filter for selecting filenames to display
  */
private FilenameFilter filter;

/**
  * @serial The mode of this dialog, either <code>LOAD</code> or 
  * <code>SAVE</code>.
  */
private int mode;

/*************************************************************************/

/*
 * Constructors
 */

/**
  * Initializes a new instance of <code>FileDialog</code> with the 
  * specified parent.  This dialog will have no title and will be for
  * loading a file.
  *
  * @param parent The parent frame for this dialog.
  */
public
FileDialog(Frame parent)
{
  this(parent, "", LOAD);
}

/*************************************************************************/

/**
  * Initialized a new instance of <code>FileDialog</code> with the
  * specified parent and title.  This dialog will be for opening a file.
  *
  * @param parent The parent frame for this dialog.
  * @param title The title for this dialog.
  */
public
FileDialog(Frame parent, String title)
{
  this(parent, title, LOAD);
}

/*************************************************************************/

/**
  * Initialized a new instance of <code>FileDialog</code> with the
  * specified parent, title, and mode.
  *
  * @param parent The parent frame for this dialog.
  * @param title The title for this dialog.
  * @param mode The mode of the dialog, either <code>LOAD</code> or
  * <code>SAVE</code>.
  */
public
FileDialog(Frame parent, String title, int mode)
{
  super(parent, title, true);

  if ((mode != LOAD) && (mode != SAVE))
    throw new IllegalArgumentException("Bad mode: " + mode);

  this.mode = mode;
}

/*************************************************************************/

/*
 * Instance Methods
 */

/**
  * Returns the mode of this dialog, either <code>LOAD</code> or
  * <code>SAVE</code>.
  *
  * @return The mode of this dialog.
  */
public int
getMode()
{
  return(mode);
}

/*************************************************************************/

/**
  * Sets the mode of this dialog to either <code>LOAD</code> or
  * <code>SAVE</code>.  This method is only effective before the native
  * peer is created.
  *
  * @param mode The new mode of this file dialog.
  */
public void
setMode(int mode)
{
  if ((mode != LOAD) && (mode != SAVE))
    throw new IllegalArgumentException("Bad mode: " + mode);

  this.mode = mode;
}

/*************************************************************************/

/**
  * Returns the directory for this file dialog.
  *
  * @return The directory for this file dialog.
  */
public String
getDirectory()
{
  return(dir);
}

/*************************************************************************/

/**
  * Sets the directory for this file dialog.
  *
  * @param dir The new directory for this file dialog.
  */
public synchronized void
setDirectory(String dir)
{
  this.dir = dir;

  FileDialogPeer fdp = (FileDialogPeer)getPeer();
  if (fdp != null)
    fdp.setDirectory(dir);
}

/*************************************************************************/

/**
  * Returns the file that is selected in this dialog.
  *
  * @return The file that is selected in this dialog.
  */
public String
getFile()
{
  return(file);
}

/*************************************************************************/

/**
  * Sets the selected file for this dialog.
  *
  * @param file The selected file for this dialog.
  */
public synchronized void
setFile(String file)
{
  this.file = file;

  FileDialogPeer fdp = (FileDialogPeer)getPeer();
  if (fdp != null)
    fdp.setFile(file);
}

/*************************************************************************/

/**
  * Returns the filename filter being used by this dialog.
  *
  * @param The filename filter being used by this dialog.
  */
public FilenameFilter
getFilenameFilter()
{
  return(filter);
}

/*************************************************************************/

/**
  * Sets the filename filter used by this dialog.
  *
  * @param filter The new filename filter for this file dialog box.
  */
public synchronized void
setFilenameFilter(FilenameFilter filter)
{
  this.filter = filter;

  FileDialogPeer fdp = (FileDialogPeer)getPeer();
  if (fdp != null)
    fdp.setFilenameFilter(filter);
}

/*************************************************************************/

/**
  * Creates the native peer for this file dialog box.
  */
public void
addNotify()
{
  if (getPeer() != null)
    return;

  setPeer((ComponentPeer)getToolkit().createFileDialog(this));
}

/*************************************************************************/

/**
  * Returns a debugging string for this object.
  *
  * @return A debugging string for this object.
  */
protected String
paramString()
{
  return(getClass().getName() + "(dir=" + dir + ",file=" + file +
         ",mode=" + mode + ")");
}

} // class FileDialog