foldertreepanel.java

一个用java写的mail.里面的代码值得我们去研究！学习。

/*
** $Id: FolderTreePanel.java,v 1.6 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.BorderLayout;
import java.awt.Dimension;
import java.awt.Frame;

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

import javax.mail.Folder;
import javax.mail.MessagingException;
import javax.mail.NoSuchProviderException;
import javax.mail.Session;
import javax.mail.Store;
import javax.mail.URLName;

import javax.swing.JDialog;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JPopupMenu;
import javax.swing.JProgressBar;
import javax.swing.JScrollPane;
import javax.swing.JTree;

import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.TreeModel;
import javax.swing.tree.TreeNode;
import javax.swing.tree.TreePath;

import javax.swing.event.TreeSelectionEvent;
import javax.swing.event.TreeSelectionListener;

import org.icemail.Package; 

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


/**
 * Class FolderTreePanel
 */
public class FolderTreePanel
  extends JPanel
  implements ActionDistributor
{
  private static final int Debug_ = Package.DEBUG ? Package.getLevel( "FolderTreePanel" ) : 0;

  private static FolderTreePanel Instance_ = null;

  private DefaultMutableTreeNode rootNode_;
  private JTree                  tree_;
  private MessagePanel           messagePanel_;

  private JPopupMenu             folderPopup_;
  private JPopupMenu             storePopup_;

  private ActionListener         actionListener_ = new IActionListener();

  /**
   * Default constructor, private to disable multiple instantiations.
   */
  private
  FolderTreePanel() {
    super( true );

    String nodeTitle = ICEMail.getBundle().getString( "FolderTree.title.stores" );

    rootNode_ = new RootTreeNode( nodeTitle );

    TreeModel xtreeModel = new DefaultTreeModel( rootNode_ );

    tree_ = new JTree( xtreeModel );

    folderPopup_ = ComponentFactory.getPopupMenuAndItems( ICEMail.getBundle(),
                                                          "FolderTree.Folder",
                                                          actionListener_ );

    storePopup_ = ComponentFactory.getPopupMenuAndItems( ICEMail.getBundle(),
                                                         "FolderTree.Store",
                                                         actionListener_ );

    tree_.addMouseListener( new IMouseAdapter() );

    tree_.setCellRenderer( new FolderTreeCellRenderer() );

    tree_.addTreeSelectionListener( new ITreeSelectionListener() );

    JScrollPane xscrollPane = new JScrollPane();
    xscrollPane.setMinimumSize( new Dimension(5, 25) );
    xscrollPane.setPreferredSize( new Dimension(100, 150) );
    xscrollPane.getViewport().add( tree_ );

    setLayout( new BorderLayout() );
    add( xscrollPane );
  }

  /**
   * Get the SINGLE instance of the panel, creating it if necessary.
   *
   * @return the SINGLE instance of the panel
   */
  public static synchronized FolderTreePanel
  getInstance() {
    if ( FolderTreePanel.Instance_ == null ) {
      FolderTreePanel.Instance_ = new FolderTreePanel();
    }
    return FolderTreePanel.Instance_;
  }

  public void
  distribute( ActionEvent event ) {
    if ( Package.DEBUG && Package.isTraceable( "FolderTreePanel" ) ) {
      System.out.println( "FolderTreePanel.distribute(ae): " + event );
    }
    actionListener_.actionPerformed( event );
  }

  public ActionListener
  getActionListener() {
    return actionListener_;
  }

  public DefaultMutableTreeNode
  getRootNode() {
    return rootNode_;
  }

  public void
  setMessagePanel( MessagePanel messagePanel ) {
    messagePanel_ = messagePanel;

    loadRootStores();
  }

  public Store
  getStore( String name ) {
    int numRoot = rootNode_.getChildCount();

    for ( int i = 0 ; i < numRoot ; ++i ) {
      StoreTreeNode node = (StoreTreeNode)rootNode_.getChildAt( i );

      if ( node != null && name.equals( node.getName() ) ) {
        return node.getStore();
      }
    }
    return null;
  }

  public void
  loadRootStores() {
    if ( messagePanel_ != null ) {
      messagePanel_.setFolder( null );
    }

    String[] nameList =
      UserProperties.getStringArray( Configuration.P_STORE_LIST, null );

    if ( nameList == null )
      return;

    String[] storeList = new String[ nameList.length ];
    String[] spaceList = new String[ nameList.length ];

    for ( int i = 0 ; i < nameList.length ; ++i ) {
      storeList[i] =
        UserProperties.getProperty( Configuration.PP_STORE_URL + nameList[i], null );

      spaceList[i] =
        UserProperties.getProperty( Configuration.PP_STORE_NMSPC + nameList[i], null );
    }

    setRootStores( nameList, storeList, spaceList );
  }

  private void
  setRootStores( String[] storeNames, String[] storeList, String[] nameSpaceList ) {
    try {
      Session session = ICEMail.getDefaultSession();

      String nodeTitle = ICEMail.getBundle().getString( "FolderTree.title.stores" );

      rootNode_ = new RootTreeNode( nodeTitle );

    // create a node for each store we have
      for ( int i = 0 ; i < storeList.length ; ++i ) {
        if ( storeList[i] == null )
          continue;

        URLName urln = new URLName( storeList[i] );

        Store store = session.getStore( urln );
        
        StoreTreeNode storenode =
          new StoreTreeNode( storeNames[i], store, nameSpaceList[i] );

        rootNode_.add( storenode );
      }
    } catch ( NoSuchProviderException ex ) {
      System.err.println( "FolderTreePanel.setRootFolders: NoSuchProviderException: " +
                          ex.getMessage() );
    }

    TreeModel xtreeModel = new DefaultTreeModel( rootNode_ );

    tree_.setModel( xtreeModel );
    tree_.expandRow( 0 );
  }

  private void
  openSelectedNode() {
    DefaultMutableTreeNode node = getSelectedNode();

    if ( node instanceof StoreTreeNode ) {
      tree_.expandPath( new TreePath( node.getPath() ) );
    } else if ( node instanceof FolderTreeNode ) {
      openSelectedFolder();
    }
  }

  private FolderTreeNode
  getSelectedFolder() {
    DefaultMutableTreeNode node = getSelectedNode();

    if ( node instanceof FolderTreeNode )
      return (FolderTreeNode) node;
    else
      return null;
  }

  private DefaultMutableTreeNode
  getSelectedNode() {
    DefaultMutableTreeNode result = null;

    TreePath path = tree_.getSelectionPath();

    if ( path != null ) {
      Object obj = path.getLastPathComponent();
      result = (DefaultMutableTreeNode) obj;
    }

    return result;
  }

  private void
  addNewStore() {
    OpenStoreDialog dlg = new OpenStoreDialog( (Frame)getTopLevelAncestor() );

    dlg.show();

    if ( dlg.getStoreURL() != null && dlg.getStoreURL().length() > 0 &&
         dlg.getStoreName() != null && dlg.getStoreName().length() > 0 ) {
      try {
        Session session = ICEMail.getDefaultSession();

        URLName urln = new URLName( dlg.getStoreURL() );

        Store store = session.getStore( urln );

        StoreTreeNode newNode =
          new StoreTreeNode( dlg.getStoreName(), store, dlg.getNameSpace() );

        int tsz = rootNode_.getChildCount();
        rootNode_.insert( newNode, tsz );

        DefaultTreeModel model = (DefaultTreeModel) tree_.getModel();
        
        int[] indices = { tsz };
        model.nodesWereInserted( rootNode_, indices );

        tree_.expandRow( 0 );
        tree_.invalidate();
        tree_.validate();
      } catch ( NoSuchProviderException ex ) {
      // UNDONE - notify use with JOptionPane...
        System.err.println( "FolderTreePanel.setRootFolders: NoSuchProviderException: " +