SqlColumnAssignment.cs

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// 
//  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.Statements {
    public sealed class SqlColumnAssignment : IPreparable {
        public SqlColumnAssignment(string columnName, SqlExpression expression) {
            if (expression == null)
                throw new ArgumentNullException("expression");
            if (String.IsNullOrEmpty(columnName))
                throw new ArgumentNullException("columnName");

            ColumnName = columnName;
            Expression = expression;
        }

        public string ColumnName { get; private set; }

        public SqlExpression Expression { get; private set; }

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

            return new SqlColumnAssignment(ColumnName, expression);
        }
    }
}