    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.beanmodel.PropertyModel;
    018
    019/**
    020 * Identifies how a single column (identified as a {@link org.apache.tapestry5.beanmodel.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}