SqlConstantExpression.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.Serialization;
using Deveel.Data.Types;

namespace Deveel.Data.Sql.Expressions {
    [Serializable]
    public sealed class SqlConstantExpression : SqlExpression {
        internal SqlConstantExpression(DataObject value) {
            Value = value;
        }

        private SqlConstantExpression(ObjectData data)
            : base(data) {
            Value = data.GetValue<DataObject>("Value");
        }

        public override SqlExpressionType ExpressionType {
            get { return SqlExpressionType.Constant; }
        }

        public override bool CanEvaluate {
            get {
                if (Value.Type is ArrayType ||
                    Value.Type is QueryType)
                    return true;

                return false;
            }
        }

        public DataObject Value { get; private set; }

        protected override void GetData(SerializeData data) {
            data.SetValue("Value", typeof(DataObject), Value);
        }
    }
}