mhstore.java

一个用java写的mail.里面的代码值得我们去研究！学习。

/*
** $Id: MHStore.java,v 1.4 2001/05/07 12:38:11 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.javamail.mh;

import java.io.File;

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


/**
 * The storage class implementing an MH local disk mail protocol.
 */
public class MHStore
  extends Store
{
  private static final String    VERSION_STR = "3.0.4";

  private String      path_ = null;
  private MHFolder    defaultFolder_ = null;


  /**
   * Constructor.
   */
  public
  MHStore( Session session, URLName urlname ) {
    super( session, urlname );

  // set debug if a port is specified
  //  this.debug = ( urlname.getPort() > 0 );

  // translate the URL into a local file path
    path_ = urlname.getFile();

    String xuserPath = System.getProperty( "user.dir" );
    String xhomePath = System.getProperty( "user.home" );

    if ( path_ != null && path_.equals( "~" ) ) {
    // "~" becomes the home directory of the user
      path_ = xhomePath;
    }

    if ( path_ != null && path_.startsWith( "~/" ) ) {
    // "~" becomes the home directory of the user
      path_ = xhomePath + path_.substring( 1 );
    }

    if ( path_ != null && path_.equals( "." ) ) {
    // "." becomes the current directory of the user
      path_ = xuserPath;
    }

    if ( path_ != null && path_.startsWith( "./" ) ) {
    // "." becomes the current directory of the user
      path_ = xuserPath + path_.substring(1);
    }

    if ( path_ != null && path_.length() == 0 ) {
    // default to the current directory of the user
      path_ = xuserPath;
    }

    if ( path_ == null || path_.length() == 0 ) {
    // default to the current directory of the user
      path_ = ".";
    }

    // translate the URL separators into local OS specific separators
    path_ = path_.replace( File.separatorChar, '/' );
  }

  /**
   * Returns the debug level of this store.
   */
  public boolean
  getDebug() {
    return super.debug;
  }

  /**
   * Get the path to the root directory of the store.
   */
  public String
  getPath() {
    return path_;
  }

  /**
   * For now, all connects are successful.
   * <p>
   * Implementation of javax.mail.Service.protocolConnect().
   */
  protected boolean
  protocolConnect( String host, int port, String username, String password )
    throws MessagingException {
    return true;
  }

  /**
   * Closes the connection.
   * <p>
   * Implementation of javax.mail.Service.close().
   */
  public synchronized void
  close() throws MessagingException {
    super.close();
  }

  /**
   * Returns the default folder.
   * <p>
   * Implements javax.mail.Store.getDefaultFolder().
   */
  public Folder
  getDefaultFolder() throws MessagingException {
    if ( defaultFolder_ == null ) {
      defaultFolder_ = new MHFolder( this, "", super.debug );
    }
    return defaultFolder_;
  }

  /**
   * Returns the specified folder.
   * <p>
   * Implements javax.mail.Store.getFolder().
   */
  public Folder
  getFolder( String s ) throws MessagingException {
    MHFolder xfolder = new MHFolder( this, s, super.debug );
    return xfolder;
  }

  /**
   * Returns the specified folder.
   * <p>
   * Implements javax.mail.Store.getFolder().
   */
  public Folder
  getFolder( URLName urlname ) throws MessagingException {
    return getFolder( urlname.getFile() );
  }
}