SortColumn.cs

Go to the documentation of this file.

// 
//  Copyright 2010-2015 Deveel
// 
//    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.
//

using System;

using Deveel.Data.Sql.Expressions;

namespace Deveel.Data.Sql {
    public sealed class SortColumn : IPreparable {
        public SortColumn(SqlExpression expression, bool ascending) {
            Expression = expression;
            Ascending = ascending;
        }

        public SortColumn(SqlExpression expression)
            : this(expression, true) {
        }

        public SortColumn(string expression, bool ascending)
            : this(SqlExpression.Parse(expression), ascending) {
        }

        public SortColumn(string expression)
            : this(expression, true) {
        }

        public SqlExpression Expression { get; internal set; }

        public bool Ascending { get; private set; }

        object IPreparable.Prepare(IExpressionPreparer preparer) {
            var exp = Expression;
            if (exp != null) {
                exp = exp.Prepare(preparer);
            }

            return new SortColumn(exp, Ascending);
        }
    }
}