src.com.ibm.as400.util.servlet.RowDataSupport Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of jt400 Show documentation
The Open Source version of the IBM Toolbox for Java
There is a newer version: 20.0.8
///////////////////////////////////////////////////////////////////////////////
//                                                                             
// JTOpen (IBM Toolbox for Java - OSS version)                              
//                                                                             
// Filename: RowDataSupport.java
//                                                                             
// The source code contained herein is licensed under the IBM Public License   
// Version 1.0, which has been approved by the Open Source Initiative.         
// Copyright (C) 1997-2000 International Business Machines Corporation and     
// others. All rights reserved.                                                
//                                                                             
///////////////////////////////////////////////////////////////////////////////

package com.ibm.as400.util.servlet;

import java.util.Vector;

class RowDataSupport
{
   transient private Vector rowListeners_;      // The list of row listeners.
   transient private Object source_;

   public RowDataSupport(Object source)
   {
      rowListeners_ = new Vector();
      source_ = source;
   }
   
   /**
   *  Adds an RowDataListener.
   *  The RowDataListener object is added to an internal list of RowDataListeners;
   *  it can be removed with removeRowDataListener.
   *
   *  @param listener The RowDataListener.
   **/
   public void addRowDataListener(RowDataListener listener)
   {
      if (listener == null) 
         throw new NullPointerException("listener");
      
      rowListeners_.addElement(listener);
   }

   /**
   *  Fire an added event.
   **/
   public void fireAdded()
   {
      Vector targets;
      targets = (Vector) rowListeners_.clone();
      RowDataEvent event = new RowDataEvent(source_, RowDataEvent.ROW_ADDED);
      for (int i = 0; i < targets.size(); i++) {
          RowDataListener target = (RowDataListener)targets.elementAt(i);
          target.rowAdded(event);
      }
   }

   /**
   *  Fire a changed event.
   **/
   public void fireChanged()
   {
      Vector targets;
      targets = (Vector) rowListeners_.clone();
      RowDataEvent event = new RowDataEvent(source_, RowDataEvent.ROW_CHANGED);
      for (int i = 0; i < targets.size(); i++) {
          RowDataListener target = (RowDataListener)targets.elementAt(i);
          target.rowChanged(event);
      }
   }

   /**
   *  Fire a removed event.
   **/
   public void fireRemoved()
   {
      Vector targets;
      targets = (Vector) rowListeners_.clone();
      RowDataEvent event = new RowDataEvent(source_, RowDataEvent.ROW_REMOVED);
      for (int i = 0; i < targets.size(); i++) {
          RowDataListener target = (RowDataListener)targets.elementAt(i);
          target.rowRemoved(event);
      }
   }

   /**
   *  Removes this RowDataListener from the internal list.
   *  If the RowDataListener is not on the list, nothing is done.
   *  @param listener The RowDataListener.
   **/
   public void removeRowDataListener(RowDataListener listener)
   {
      if (listener == null)
         throw new NullPointerException("listener");
      
      rowListeners_.removeElement(listener);
   }
}