transportdialog.java

一个用java写的mail.里面的代码值得我们去研究！学习。

/*
** $Id: TransportDialog.java,v 1.4 2001/05/07 12:37:22 kunugi Exp $
**
** Copyright (c) 2000-2001 Jeff Gay
** on behalf of ICEMail.org <http://www.icemail.org>
** Copyright (c) 1998-2000 by Timothy Gerard Endres
** 
** This program is free software.
** 
** You may redistribute it and/or modify it under the terms of the GNU
** General Public License as published by the Free Software Foundation.
** Version 2 of the license should be included with this distribution in
** the file LICENSE, as well as License.html. If the license is not
** included with this distribution, you may find a copy at the FSF web
** site at 'www.gnu.org' or 'www.fsf.org', or you may write to the
** Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139 USA.
**
** THIS SOFTWARE IS PROVIDED AS-IS WITHOUT WARRANTY OF ANY KIND,
** NOT EVEN THE IMPLIED WARRANTY OF MERCHANTABILITY. THE AUTHOR
** OF THIS SOFTWARE, ASSUMES _NO_ RESPONSIBILITY FOR ANY
** CONSEQUENCE RESULTING FROM THE USE, MODIFICATION, OR
** REDISTRIBUTION OF THIS SOFTWARE. 
*/

package org.icemail.mail;

import java.awt.Container;
import java.awt.Dimension;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Frame;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import java.util.Vector;

import javax.mail.Provider;
import javax.mail.Session;

import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.JTextField;

import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;

import javax.swing.border.EmptyBorder;

import org.icemail.util.AWTUtilities; 
import org.icemail.util.ComponentFactory; 
import org.icemail.util.JFCUtilities; 
import org.icemail.util.UserProperties; 


/**
 * A dialog which allows the transport protocol to be configured.
 * The options are stored as part of the configuration properties.
 *
 * @see Configuration
 */
public class TransportDialog
  extends JDialog
{
  private JTextField protocolField;
  private JList      transportList;


  /**
   * Construct a dialog for configuring transport protocol options.
   *
   * @param parent parent frame to return to after disposed
   */
  public
  TransportDialog( Frame parent ) {
    super( parent, true );

    establishContents();
    pack();

    int w = UserProperties.getProperty( "transProtoDialog.width", 450 );
    int h = UserProperties.getProperty( "transProtoDialog.height", 400 );
    setSize( w, h );
    setLocation( AWTUtilities.computeDialogLocation( this ) );
  }

//............................................................

  private void
  saveProtocol() {
    String xprotocol = this.protocolField.getText();
    if ( xprotocol != null && xprotocol.length() > 0 ) {
      Configuration.getInstance().setProperty( Configuration.P_TRANSPORT_PROTO, xprotocol );
      Configuration.getInstance().saveProperties();
    }
  }

  private void
  establishContents() {
    setTitle( ICEMail.getBundle().getString( "Transport.Title" ) );

    Container cont = getContentPane();
    cont.setLayout( new GridBagLayout() );

    ActionListener xlistener = new IActionListener();

    int row = 0;

    JPanel namePan = new JPanel();
    namePan.setLayout( new GridBagLayout() );
    namePan.setBorder( new EmptyBorder( 4, 4, 4, 4 ) );
    AWTUtilities.constrain( cont, namePan, GridBagConstraints.HORIZONTAL,
                            GridBagConstraints.CENTER, 0, row++, 2, 1, 1.0, 0.0 );

    JLabel  lbl;
    lbl = ComponentFactory.getLabel( ICEMail.getBundle(), "Transport.Protocol" );
    lbl.setHorizontalAlignment( JLabel.RIGHT );
    AWTUtilities.constrain( namePan, lbl, GridBagConstraints.NONE,
                            GridBagConstraints.WEST, 0, 0, 1, 1, 0.0, 0.0 );

    this.protocolField =
        ComponentFactory.getTextField( ICEMail.getBundle(), "Transport.Protocol", null );
    this.protocolField.setText(
        UserProperties.getProperty( Configuration.P_TRANSPORT_PROTO, "" ) );
    AWTUtilities.constrain( namePan, this.protocolField, GridBagConstraints.HORIZONTAL,
                            GridBagConstraints.WEST, 1, 0, 1, 1, 1.0, 0.0 );

    int listRow = 0;
    JPanel listPan = new JPanel();
    listPan.setLayout( new GridBagLayout() );
    listPan.setBorder( JFCUtilities.StandardBorder );
    AWTUtilities.constrain( cont, listPan, GridBagConstraints.BOTH,
                            GridBagConstraints.CENTER, 0, row++, 2, 1, 1.0, 1.0 );

    lbl = ComponentFactory.getLabel( ICEMail.getBundle(), "Transport.Available" );
    lbl.setBorder( new EmptyBorder( 1, 3, 1, 1 ) );
    lbl.setHorizontalAlignment( JLabel.LEFT );
    AWTUtilities.constrain( listPan, lbl, GridBagConstraints.HORIZONTAL,
                            GridBagConstraints.WEST, 0, listRow++, 1, 1, 1.0, 0.0 );

    Vector transports = new Vector();
    Session session = ICEMail.getDefaultSession();
    Provider[] providers = session.getProviders();
    for ( int i = 0 ; i < providers.length ; ++i ) {
      if ( providers[i].getType() == Provider.Type.TRANSPORT ) {
        transports.addElement( providers[i].getProtocol() );
      }
    }

    this.transportList = new JList( transports );
    this.transportList.setBorder( new EmptyBorder( 2, 2, 2, 2 ) );
    this.transportList.addListSelectionListener( new IListSelectionListener() );

    AWTUtilities.constrain( listPan, this.transportList, GridBagConstraints.BOTH,
                            GridBagConstraints.CENTER, 0, row++, 2, 1, 1.0, 1.0 );

    JPanel btnPan = new JPanel();
    btnPan.setLayout( new GridBagLayout() );
    btnPan.setBorder( JFCUtilities.StandardBorder );
    AWTUtilities.constrain( cont, btnPan, GridBagConstraints.HORIZONTAL,
                            GridBagConstraints.CENTER, 0, row++, 2, 1, 1.0, 0.0 );

    JButton btn;
    btn = ComponentFactory.getButton( ICEMail.getBundle(), "Transport.Save",
                                      xlistener, null );
    AWTUtilities.constrain( btnPan, btn, GridBagConstraints.HORIZONTAL,
                            GridBagConstraints.CENTER, 0, 0, 1, 1, 1.0, 0.0 );

    btn = ComponentFactory.getButton( ICEMail.getBundle(), "Transport.Cancel",
                                      xlistener, null );
    AWTUtilities.constrain( btnPan, btn, GridBagConstraints.HORIZONTAL,
                            GridBagConstraints.CENTER, 1, 0, 1, 1, 1.0, 0.0 );
  }

//............................................................

  private class IActionListener
    implements ActionListener
  {
    /**
     * Invoked when an action occurs.
     * <p>
     * Implementation of java.awt.event.ActionListener.actionPerformed()
     *
     * @param event the action event that occured
     */
    public void
    actionPerformed( ActionEvent event ) {
      boolean disposeIt = false;
      String command = event.getActionCommand();

      if ( command.equals( "SAVE" ) ) {
        saveProtocol();
        disposeIt = true;
      } else if ( command.equals( "CANCEL" ) ) {
        disposeIt = true;
      }

      if ( disposeIt )
        dispose();
    }
  }

//............................................................

  private class IListSelectionListener
    implements ListSelectionListener
  {
    public void
    valueChanged( ListSelectionEvent event ) {
      if ( ! event.getValueIsAdjusting() ) {
        String transportName = (String)transportList.getSelectedValue();

        if ( transportName != null ) {
          protocolField.setText( transportName );
        }
      }
    }
  }

}