/*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you under the Apache License, Version 2.0 (the
    * "License"); you may not use this file except in compliance
    * with the License.  You may obtain a copy of the License at
    *
   *   http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing,
   * software distributed under the License is distributed on an
   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   * KIND, either express or implied.  See the License for the
   * specific language governing permissions and limitations
   * under the License.
   */
  package jakarta.faces.event;
  
  import jakarta.faces.component.UIComponent;
  import jakarta.faces.context.FacesContext;
  
  /**
   * see Javadoc of <a href="http://java.sun.com/javaee/javaserverfaces/1.2/docs/api/index.html">JSF Specification</a>
   */
  public class ValueChangeEvent extends FacesEvent
  {
      private static final long serialVersionUID = -2490528664421353795L;
      // FIELDS
      private Object _oldValue;
      private Object _newValue;
  
      public ValueChangeEvent(FacesContext facesContext, UIComponent uiComponent, Object oldValue, Object newValue)
      {
          super(facesContext, uiComponent);
          if (uiComponent == null)
          {
              throw new IllegalArgumentException("uiComponent");
          }
          _oldValue = oldValue;
          _newValue = newValue;
      }
  
      // CONSTRUCTORS
      public ValueChangeEvent(UIComponent uiComponent, Object oldValue, Object newValue)
      {
          super(uiComponent);
          if (uiComponent == null)
          {
              throw new IllegalArgumentException("uiComponent");
          }
          _oldValue = oldValue;
          _newValue = newValue;
      }
  
      // METHODS
      public Object getNewValue()
      {
          return _newValue;
      }
  
      public Object getOldValue()
      {
          return _oldValue;
      }
  
      @Override
      public boolean isAppropriateListener(FacesListener facesListeners)
      {
          return facesListeners instanceof ValueChangeListener;
      }
  
      @Override
      public void processListener(FacesListener facesListeners)
      {
          ((ValueChangeListener)facesListeners).processValueChange(this);
      }
  }