SqlQueryObject.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.Sql.Query;

namespace Deveel.Data.Sql.Objects {
    [Serializable]
    public sealed class SqlQueryObject : ISqlObject, ISerializable {
        public static readonly SqlQueryObject Null = new SqlQueryObject((IQueryPlanNode) null);

        public SqlQueryObject(IQueryPlanNode queryPlan) {
            QueryPlan = queryPlan;
        }

        private SqlQueryObject(ObjectData data) {
            QueryPlan = data.GetValue<IQueryPlanNode>("QueryPlan");
        }

        public IQueryPlanNode QueryPlan { get; private set; }

        int IComparable.CompareTo(object obj) {
            throw new NotSupportedException("SQL queries cannot be compared.");
        }

        int IComparable<ISqlObject>.CompareTo(ISqlObject other) {
            throw new NotSupportedException("SQL queries cannot be compared.");
        }

        public bool IsNull {
            get { return QueryPlan == null; }
        }

        bool ISqlObject.IsComparableTo(ISqlObject other) {
            return false;
        }

        void ISerializable.GetData(SerializeData data) {
            data.SetValue("QueryPlan", QueryPlan);
        }
    }
}