extraheadersdialog.java

一个用java写的mail.里面的代码值得我们去研究！学习。

/*
** $Id: ExtraHeadersDialog.java,v 1.4 2001/05/07 12:37:21 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.Frame;
import java.awt.Dimension;
import java.awt.GridBagLayout;
import java.awt.GridBagConstraints;
import java.awt.Container;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Vector;
import java.util.Enumeration;
import java.io.File;

import javax.mail.Header;
import javax.mail.internet.InternetHeaders;

import javax.swing.JDialog;
import javax.swing.JLabel;
import javax.swing.JTextField;
import javax.swing.JPanel;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JSeparator;

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;


/**
 * This class represents a dialog to change, add or delete
 * extra (non-standard) MIME headers.
 *
 * @see ComposeFrame
 */
public class ExtraHeadersDialog
  extends JDialog
{
  public static final int  NUM_HEADERS = 5;

  private JCheckBox     approvedCheckBox_;
  private JTextField    approvedTextField_;
  private JTextField[]  hdrName_ = new JTextField[ NUM_HEADERS ];
  private JTextField[]  hdrValue_ = new JTextField[ NUM_HEADERS ];

  private Vector        names_ = new Vector();
  private Vector        values_ = new Vector();

  private String        approvedStr_ = null;


  /**
   * Constract a dialog, initializing the contents from the given headers.
   *
   * @param frame parent frame to return focus after disposal
   * @param headers initial header contents
   */
  public
  ExtraHeadersDialog( Frame frame, InternetHeaders headers ) {
    super( frame, true );

    establishContents( headers );

    pack();

    Dimension sz = getSize();
    int w = UserProperties.getProperty( "extraHeaderDialog.width", sz.width );
    int h = UserProperties.getProperty( "extraHeaderDialog.height", sz.height );
    setSize( w, h );

    setLocation( AWTUtilities.computeDialogLocation( this ) );
  }

  /**
   * Get the contents of the dialog as a set of InternetHeaders.
   * <p>
   * The returned headers will have the orginal contents of those provided,
   * plus any modifications, additions, or deletions when 'saved'. The
   * return headers may be empty if all headers have been deleted.
   *
   * @return the dialog contents converted to a set of InternetHeaders
   */
  public InternetHeaders
  getInternetHeaders() {
    InternetHeaders xheaders = new InternetHeaders();

    if ( approvedStr_ != null ) {
      xheaders.addHeader( "Approved", approvedStr_ );
    }

    for ( int i = 0 ; i < names_.size() ; ++i ) {
      xheaders.addHeader( (String)names_.elementAt( i ), (String)values_.elementAt( i ) );
    }

    return xheaders;
  }

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

  private void
  establishContents( InternetHeaders headers ) {
    setTitle( ICEMail.getBundle().getString( "ExtraHeaders.Title" ) );

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

    ActionListener xlistener = new IActionListener();

    int row = 0;
    int cols = 3;
    int subrow = 0;

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

    approvedCheckBox_ =
      ComponentFactory.getCheckBox( ICEMail.getBundle(), "ExtraHeaders.Approved", false );
    AWTUtilities.constrain( aPan, approvedCheckBox_, GridBagConstraints.HORIZONTAL,
                            GridBagConstraints.EAST, 0, subrow, 1, 1, 0.3, 0.0 );

    approvedTextField_ =
      ComponentFactory.getTextField( ICEMail.getBundle(), "ExtraHeaders.Approved", null );
    AWTUtilities.constrain( aPan, approvedTextField_, GridBagConstraints.HORIZONTAL,
                            GridBagConstraints.WEST, 1, subrow++, 1, 1, 0.7, 0.0 );

    JSeparator sep = new JSeparator( JSeparator.HORIZONTAL );
    AWTUtilities.constrain( aPan, sep, GridBagConstraints.HORIZONTAL,
                            GridBagConstraints.CENTER, 0, subrow++, 2, 1, 1.0, 0.0,
                            new Insets( 4, 1, 5, 1 ) );

    hdrName_ = new JTextField[ NUM_HEADERS ];
    hdrValue_ = new JTextField[ NUM_HEADERS ];

    for ( int i = 0 ; i < NUM_HEADERS ; ++i ) {
      hdrName_[i] = new JTextField();
      AWTUtilities.constrain( aPan, hdrName_[i], GridBagConstraints.HORIZONTAL,
                              GridBagConstraints.WEST, 0, subrow, 1, 1, 0.3, 0.0 );

      hdrValue_[i] = new JTextField();
      AWTUtilities.constrain( aPan, hdrValue_[i], GridBagConstraints.HORIZONTAL,
                              GridBagConstraints.WEST, 1, subrow++, 1, 1, 0.7, 0.0 );
    }

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

    JButton btn;

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

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

    if ( headers != null ) {
      int hRow = 0;
      Enumeration enum = headers.getAllHeaders();
      for ( ; enum.hasMoreElements() ; ) {
        Header hdr = (Header) enum.nextElement();

        String hdrName = hdr.getName();
        String hdrValue = hdr.getValue();
        if ( hdrName.equalsIgnoreCase( "Approved" ) ) {
          approvedCheckBox_.setSelected( true );
          approvedTextField_.setText( hdrValue );
        } else {
          hdrName_[hRow].setText( hdrName );
          hdrValue_[hRow].setText( hdrValue );
          ++hRow;
        }
      }
    }
  }

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

  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 ) {
      String command = event.getActionCommand();

      if ( command.equals( "SAVE" ) ) {
        if ( approvedCheckBox_.isSelected() ) {
          approvedStr_ = approvedTextField_.getText();
        }

        for ( int i = 0 ; i < NUM_HEADERS ; ++i ) {
          String name = hdrName_[i].getText();
          if ( name.length() > 0 ) {
            names_.addElement( name );
            values_.addElement( hdrValue_[i].getText() );
          }
        }
      } else if ( command.equals( "CANCEL" ) ) {
        approvedStr_ = null;
      }

      dispose();
    }
  }

}