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  // Copyright 2004, 2005 The Apache Software Foundation
  //
  // Licensed 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 org.apache.tapestry.record;
 
 import  org.apache.hivemind.util.Defense;
 import  org.apache.hivemind.util.ToStringBuilder;

Represents a change to a component on a page.

Author(s):
Howard Lewis Ship
 
 
 public class PropertyChangeImpl implements PropertyChange
 {
 
     private String _componentPath;
 
     private String _propertyName;
 
     private Object _newValue;
 
     public PropertyChangeImpl(String componentPathString propertyName,
             Object newValue)
     {
         Defense.notNull(propertyName"propertyName");
 
         // TODO: This breaks some tests, but those tests are wrong.
         // Defense.notNull(newValue, "newValue");
 
          = componentPath;
          = propertyName;
          = newValue;
     }

    
The path to the component on the page, or null if the property is a property of the page.
 
 
     public String getComponentPath()
     {
         return ;
     }

    
The new value for the property, which may be null.
 
 
     public Object getNewValue()
     {
         return ;
     }

    
The name of the property that changed.
 
 
     public String getPropertyName()
     {
         return ;
     }
 
     public String toString()
     {
         ToStringBuilder builder = new ToStringBuilder(this);
 
         builder.append("componentPath");
         builder.append("propertyName");
         builder.append("newValue");
 
         return builder.toString();
     }
 
     public boolean equals(Object object)
     {
         if (this == objectreturn true;
 
         if (object == null || object.getClass() != this.getClass())
             return false;
 
         PropertyChangeImpl other = (PropertyChangeImplobject;
 
         return same(other._componentPath)
                 && same(other._propertyName)
                 && same(other._newValue);
     }
    private boolean same(Object o1Object o2)
    {
        return o1 == o2 || (o1 != null && o1.equals(o2));
    }
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