001    /*
002      Copyright (C) 2003 Laurent Martelli <laurent@aopsys.com>
003      
004      This program is free software; you can redistribute it and/or modify
005      it under the terms of the GNU Lesser General Public License as
006      published by the Free Software Foundation; either version 2 of the
007      License, or (at your option) any later version.
008    
009      This program is distributed in the hope that it will be useful, but
010      WITHOUT ANY WARRANTY; without even the implied warranty of
011      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
012      Lesser General Public License for more details.
013    
014      You should have received a copy of the GNU Lesser General Public
015      License along with this program; if not, write to the Free Software
016      Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
017      USA */
018    
019    package org.objectweb.jac.aspects.queue;
020    
021    import org.objectweb.jac.core.rtti.FieldItem;
022    
023    public class FieldChangeEvent {
024       Object substance;
025       FieldItem field;
026       Object oldValue;
027       Object newValue;
028    
029       public FieldChangeEvent(Object substance, FieldItem field, 
030                               Object oldValue, Object newValue) {
031          this.substance = substance;
032          this.field = field;
033          this.oldValue = oldValue;
034          this.newValue = newValue;
035       }
036       /**
037        * Gets the object whose field was modified.
038        */
039       public Object getSubstance() {
040          return substance;
041       }
042       
043       /**
044        * Gets the modified field item.
045        */
046       public FieldItem getField() {
047          return field;
048       }
049    
050       /**
051        * Gets the value of the field before the modification.
052        */
053       public Object getOldValue() {
054          return oldValue;
055       }
056    
057       /**
058        * Gets the value of the field after the modification.
059        */
060       public Object getNewValue() {
061          return newValue;
062       }
063    
064       public String toString() {
065          return substance+"."+field.getName()+" changed from "+
066             oldValue+" to "+newValue;
067       }
068    }