// Copyright 2008 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.tapestry5.grid;

 import org.apache.tapestry5.beaneditor.PropertyModel;

 import org.apache.tapestry5.ioc.internal.util.Defense;

 /**

  * Identifies how a single column (identified as a {@link org.apache.tapestry5.beaneditor.PropertyModel}) is sorted.

  */

 public class SortConstraint

 {

     private final PropertyModel propertyModel;

     private final ColumnSort columnSort;

     public SortConstraint(PropertyModel propertyModel, ColumnSort columnSort)

     {

         Defense.notNull(propertyModel, "propertyModel");

         Defense.notNull(columnSort, "columnSort");

         this.propertyModel = propertyModel;

         this.columnSort = columnSort;

     }

     public PropertyModel getPropertyModel()

     {

         return propertyModel;

     }

     public ColumnSort getColumnSort()

     {

         return columnSort;

     }

     // equals() is useful for testing

     @Override

     public boolean equals(Object o)

     {

         if (this == o) return true;

         if (o == null || getClass() != o.getClass()) return false;

         SortConstraint that = (SortConstraint) o;

         if (columnSort != that.columnSort) return false;

         return propertyModel.equals(that.propertyModel);

     }

 }