certificatetreepanel.java

一个用java写的mail.里面的代码值得我们去研究！学习。

/*
** $Id: CertificateTreePanel.java,v 1.3 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.smime;

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Image;
import java.io.IOException;
import java.util.Enumeration;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeCellRenderer;
import javax.swing.tree.TreePath;
import javax.swing.event.TreeSelectionListener;

import iaik.asn1.ObjectID;
import iaik.asn1.structures.Name;
import iaik.x509.X509Certificate;

import org.icemail.util.AWTUtilities;


public class CertificateTreePanel
  extends JPanel
{
  private JTree             tree;
  private DefaultTreeModel  model;
  private JScrollPane       scroller;
  private X509Certificate[] chain;


  public
  CertificateTreePanel( X509Certificate[] chain, TreeSelectionListener listener ) {
    super();

    setLayout( new BorderLayout() );

    this.tree = new JTree();
    this.tree.getSelectionModel().addTreeSelectionListener( listener );

    DefaultTreeCellRenderer defRend =
      new DefaultTreeCellRenderer()
        {
        /**  
         * Overrides return slightly taller preferred size value.
         */
        public Dimension
        getPreferredSize()
          {
          Dimension result = super.getPreferredSize();
          if ( result != null ) result.height += 2;
          return result;
          }
        };

    try {
      Icon  icon;
      Image img;

      img = AWTUtilities.getImageResource( "/org/icemail/mail/images/topcert.gif" );

      if ( img != null ) {
        icon = new ImageIcon( img );
        defRend.setLeafIcon( icon );
        defRend.setOpenIcon( icon );
        defRend.setClosedIcon( icon );
      }
    } catch ( IOException ex ) {
    }

    this.tree.setCellRenderer( defRend );
    this.tree.putClientProperty( "JTree.lineStyle", "Angled" );
    this.tree.setShowsRootHandles( true );

    setCertificateChain( chain );
    this.scroller = new JScrollPane( this.tree );

    add( BorderLayout.CENTER, this.scroller );
  }

  public void
  setCertificateChain( X509Certificate[] chain ) {
    this.chain = chain;

    CertificateNode rootNode = null;
    CertificateNode parentNode = null;
    
//    CertificateNode[] nodes =
//      new CertificateNode[ chain.length ];

    for ( int i = 0 ; i < chain.length ; ++i ) {
      CertificateNode node = new CertificateNode( chain[i] );

//      nodes[i] = node;

      if ( parentNode == null ) {
        rootNode = node;
      } else {
        parentNode.add( node );
      }

      parentNode = node;
    }

    this.model = new DefaultTreeModel( rootNode );
    this.tree.setModel( this.model );
  }

  public void
  expandAllNodes() {
    Enumeration enum = ((CertificateNode) this.model.getRoot()).children();
    expandAll( enum );
  }

  public void
  expandAll( Enumeration enum ) {
    for ( ; enum.hasMoreElements() ; ) {
      CertificateNode node = (CertificateNode) enum.nextElement();

      if ( ! node.isLeaf() ) {
        this.tree.expandPath( new TreePath( node.getPath() ) );
        expandAll( node.children() );
      }
    }
  }

}