accesscontroller.java

一个数据挖掘软件ALPHAMINERR的整个过程的JAVA版源代码

/*
 *    This program is free software; you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation; either version 2 of the License, or
 *    (at your option) any later version.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with this program; if not, write to the Free Software
 *    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

package eti.bi.alphaminer.core.handler;

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Vector;

import eti.bi.alphaminer.core.observer.ObserveSubject;
import eti.bi.alphaminer.core.observer.Observer;

import sun.misc.BASE64Encoder;

/**
 * <p>Title: KBBI Application</p>
 * <p>Description: A Knowledge Based Business Intelligence Platform</p>
 * <p>Copyright: Copyright (c) 2004</p>
 * <p>Company: E-Business Technology Institute, HKU</p>
 * @author Anny Chiu
 * @version 1.0
 */

public class AccessController implements ObserveSubject{

  public static AccessController m_AccessController;

  private String m_AccessToken;
  private Vector m_Observers;
  //<<Frank J. Xu, 20/01/2005, To adapt to different DM Engine.
  private String m_DMEngineName = "ETI DM";
  private int    m_DMEngineType;
  //Frank J. Xu>>

  private AccessController() {}

  public void initialization()
  {
    m_Observers = new Vector();
  }

  public static AccessController getInstance()
  {
    if (m_AccessController==null)
    {
      m_AccessController = new AccessController();
      m_AccessController.initialization();
    }
    return m_AccessController;
  }

  /*
  public void finalize()
  {
    m_AccessController = null;
  }
  */
  
  @SuppressWarnings("unchecked")
public void registerInterest(Observer a_Observer)
  {
    m_Observers.add(a_Observer);
  }

  public String getAccessToken()
  {
    return m_AccessToken;
  }

  public void setAccessToken(String a_Access)
  {
    m_AccessToken = a_Access;
  }

  public boolean login(String a_Username, String a_Password)
  {
    if (a_Username==null || a_Username.trim().equals(""))
      System.err.println("In AccessController:login: Username cannot be empty");
    if (a_Password==null || a_Password.trim().equals(""))
      System.err.println("In AccessController:login: Password cannot be empty");

    setAccessToken(CommunicationHandlerBridge.getInstance().login(a_Username, getHashedPassword(a_Password)));

    if (getAccessToken()!=null)
    {
      for (int i=0; i<m_Observers.size(); i++)
        ((Observer) m_Observers.elementAt(i)).sendNotify("login");
      return true;
    }
    else
      return false;
  }

  public void changePassword(String a_Username, String a_OldPassword, String a_NewPassword)
  {
    if (m_AccessToken==null)
      System.err.println("In AccessController:changePassword: user not logged in before");

    if (a_Username==null || a_Username.trim().equals(""))
      System.err.println("In AccessController:changePassword: Username cannot be empty");
    if (a_OldPassword==null || a_OldPassword.trim().equals(""))
      System.err.println("In AccessController:changePassword: Old Password cannot be empty");
    if (a_NewPassword==null || a_NewPassword.trim().equals(""))
      System.err.println("In AccessController:changePassword: New Password cannot be empty");

    // notify observer
    if (CommunicationHandlerBridge.getInstance().changePassword(a_Username, getHashedPassword(a_OldPassword), getHashedPassword(a_NewPassword)))
    {
      // succeed
    }
    else
    {
      // failed
    }
  }

  public void logoff()
  {
    m_AccessToken = null;
    for (int i=0; i<m_Observers.size(); i++)
        ((Observer) m_Observers.elementAt(i)).sendNotify("logoff");
  }

  private String getHashedPassword(String a_Password)
  {
    MessageDigest md = null;
    try {
      md = MessageDigest.getInstance("SHA");
    }
    catch (NoSuchAlgorithmException e) {
      System.err.println("In AccessController:login: " + e.getMessage());
    }

    try {
      md.update(a_Password.getBytes("UTF-8"));
    }
    catch (UnsupportedEncodingException e) {
      System.err.println("In AccessController:getHashedPassword: " + e.getMessage());
    }

    byte raw[] = md.digest();
    return (new BASE64Encoder()).encode(raw);
  }
/**
 * @return Returns the m_DMEngineName.
 */
public String getM_DMEngineName() {
	return m_DMEngineName;
}
/**
 * @param engineName The m_DMEngineName to set.
 */
public void setM_DMEngineName(String engineName) {
	m_DMEngineName = engineName;
}
/**
 * @return Returns the m_DMEngineType.
 */
public int getM_DMEngineType() {
	return m_DMEngineType;
}
/**
 * @param engineType The m_DMEngineType to set.
 */
public void setM_DMEngineType(int engineType) {
	m_DMEngineType = engineType;
}
}