001    // Copyright 2008 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    import org.apache.tapestry5.ioc.internal.util.Defense;
019    
020    /**
021     * Identifies how a single column (identified as a {@link org.apache.tapestry5.beaneditor.PropertyModel}) is sorted.
022     */
023    public class SortConstraint
024    {
025        private final PropertyModel propertyModel;
026    
027        private final ColumnSort columnSort;
028    
029        public SortConstraint(PropertyModel propertyModel, ColumnSort columnSort)
030        {
031            Defense.notNull(propertyModel, "propertyModel");
032            Defense.notNull(columnSort, "columnSort");
033    
034            this.propertyModel = propertyModel;
035            this.columnSort = columnSort;
036        }
037    
038        public PropertyModel getPropertyModel()
039        {
040            return propertyModel;
041        }
042    
043        public ColumnSort getColumnSort()
044        {
045            return columnSort;
046        }
047    
048        // equals() is useful for testing
049    
050        @Override
051        public boolean equals(Object o)
052        {
053            if (this == o) return true;
054    
055            if (o == null || getClass() != o.getClass()) return false;
056    
057            SortConstraint that = (SortConstraint) o;
058    
059            if (columnSort != that.columnSort) return false;
060    
061            return propertyModel.equals(that.propertyModel);
062        }
063    }