| // Copyright 2004 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.commons.lang.builder.EqualsBuilder; |
| import org.apache.commons.lang.builder.HashCodeBuilder; |
| |
| /** |
| * Used to identify a property change. |
| * |
| * @author Howard Lewis Ship |
| * @version $Id$ |
| * |
| **/ |
| |
| public class ChangeKey |
| { |
| private int _hashCode = -1; |
| private String _componentPath; |
| private String _propertyName; |
| |
| public ChangeKey(String componentPath, String propertyName) |
| { |
| _componentPath = componentPath; |
| _propertyName = propertyName; |
| } |
| |
| public boolean equals(Object object) |
| { |
| if (object == null) |
| return false; |
| |
| if (this == object) |
| return true; |
| |
| if (!(object instanceof ChangeKey)) |
| return false; |
| |
| ChangeKey other = (ChangeKey) object; |
| |
| EqualsBuilder builder = new EqualsBuilder(); |
| |
| builder.append(_propertyName, other._propertyName); |
| builder.append(_componentPath, other._componentPath); |
| |
| return builder.isEquals(); |
| } |
| |
| public String getComponentPath() |
| { |
| return _componentPath; |
| } |
| |
| public String getPropertyName() |
| { |
| return _propertyName; |
| } |
| |
| /** |
| * |
| * Returns a hash code computed from the |
| * property name and component path. |
| * |
| **/ |
| |
| public int hashCode() |
| { |
| if (_hashCode == -1) |
| { |
| HashCodeBuilder builder = new HashCodeBuilder(257, 23); // Random |
| |
| builder.append(_propertyName); |
| builder.append(_componentPath); |
| |
| _hashCode = builder.toHashCode(); |
| } |
| |
| return _hashCode; |
| } |
| } |