clientcallbackimpl.java

java在线商店的源代码。编写十分规范的哦

/**
 * Copyright (c) 1996-2004 Borland Software Corporation.  All Rights Reserved.
 * 
 * This SOURCE CODE FILE, which has been provided by Borland Software as part
 * of a Borland Software product for use ONLY by licensed users of the product,
 * includes CONFIDENTIAL and PROPRIETARY information of Borland Software.  
 *
 * USE OF THIS SOFTWARE IS GOVERNED BY THE TERMS AND CONDITIONS 
 * OF THE LICENSE STATEMENT AND LIMITED WARRANTY FURNISHED WITH
 * THE PRODUCT.
 *
 * IN PARTICULAR, YOU WILL INDEMNIFY AND HOLD BORLAND SOFTWARE, ITS
 * RELATED COMPANIES AND ITS SUPPLIERS, HARMLESS FROM AND AGAINST ANY
 * CLAIMS OR LIABILITIES ARISING OUT OF THE USE, REPRODUCTION, OR
 * DISTRIBUTION OF YOUR PROGRAMS, INCLUDING ANY CLAIMS OR LIABILITIES
 * ARISING OUT OF OR RESULTING FROM THE USE, MODIFICATION, OR
 * DISTRIBUTION OF PROGRAMS OR FILES CREATED FROM, BASED ON, AND/OR
 * DERIVED FROM THIS SOURCE CODE FILE.
 */
//------------------------------------------------------------------------------
// Copyright (c) 1996-2004 Borland Software Corporation.  All Rights Reserved.
//------------------------------------------------------------------------------

package com.borland.samples.creditapproval.client;

import com.borland.samples.creditapproval.CORBAInterface.*;
import java.util.*;

/**
 * ClientCallbackImpl implements the IDL-defined ClientCallback
 * interface.
 *
 * This class allows the Server to provide status information to the
 * client.
 */
public class ClientCallbackImpl extends ClientCallbackPOA {

  protected CallbackObservable observable = new CallbackObservable();

  /**
   *  Default constructor.
   */
  public ClientCallbackImpl() {
    super();
  }

  /**
   *   Provide access to the embedded Observerable Object
   *   @param newObserver Observer
   *
   */
  public void addObserver(Observer newObserver) {
    observable.addObserver(newObserver);
  }

  /**
   *   Provide access to the embedded Observerable Object
   *   @param newObserver Observer
   *
   */
  public void deleteObserver(Observer newObserver) {
    observable.deleteObserver(newObserver);
  }

  /**
  *   Update the status string using the embedded Observable
  *   @param newStatus java.lang.String
  *
  */
  public void updateStatusText(java.lang.String newStatus) {
     observable.setStatusText(newStatus);
  }
}

/**
 *   Since setChanged is protected, this class had to be created
 *  versus embedding an object of type Observable.
 */
class CallbackObservable extends Observable {

  public CallbackObservable() {
    super();
  }
  /**
  *  Notify all Observers of the new status text.
  *  @param newStatus String
  *
  */
  public void setStatusText(String newStatus){
    setChanged();
    notifyObservers(newStatus);
  }

}