001    // Copyright 2008, 2010 The Apache Software Foundation
002    //
003    // Licensed under the Apache License, Version 2.0 (the "License");
004    // you may not use this file except in compliance with the License.
005    // You may obtain a copy of the License at
006    //
007    //     http://www.apache.org/licenses/LICENSE-2.0
008    //
009    // Unless required by applicable law or agreed to in writing, software
010    // distributed under the License is distributed on an "AS IS" BASIS,
011    // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012    // See the License for the specific language governing permissions and
013    // limitations under the License.
014    
015    package org.apache.tapestry5.grid;
016    
017    import org.apache.tapestry5.beaneditor.PropertyModel;
018    
019    /**
020     * Identifies how a single column (identified as a {@link org.apache.tapestry5.beaneditor.PropertyModel}) is sorted.
021     */
022    public class SortConstraint
023    {
024        private final PropertyModel propertyModel;
025    
026        private final ColumnSort columnSort;
027    
028        public SortConstraint(PropertyModel propertyModel, ColumnSort columnSort)
029        {
030            assert propertyModel != null;
031            assert columnSort != null;
032    
033            this.propertyModel = propertyModel;
034            this.columnSort = columnSort;
035        }
036    
037        public PropertyModel getPropertyModel()
038        {
039            return propertyModel;
040        }
041    
042        public ColumnSort getColumnSort()
043        {
044            return columnSort;
045        }
046    
047        // equals() is useful for testing
048    
049        @Override
050        public boolean equals(Object o)
051        {
052            if (this == o) return true;
053    
054            if (o == null || getClass() != o.getClass()) return false;
055    
056            SortConstraint that = (SortConstraint) o;
057    
058            if (columnSort != that.columnSort) return false;
059    
060            return propertyModel.equals(that.propertyModel);
061        }
062    }