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
015package org.apache.tapestry5.grid;
016
017import 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 */
022public 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}