LimitNode.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.Tables;

namespace Deveel.Data.Sql.Query {
    [Serializable]
    class LimitNode : SingleQueryPlanNode {
        public long Offset { get; private set; }

        public long Count { get; private set; }

        public LimitNode(IQueryPlanNode child, long offset, long count) 
            : base(child) {
            Offset = offset;
            Count = count;
        }

        private LimitNode(ObjectData data)
            : base(data) {
            Offset = data.GetInt64("Offset");
            Count = data.GetInt64("Count");
        }

        public override ITable Evaluate(IRequest context) {
            var table = Child.Evaluate(context);
            return new LimitedTable(table, Offset, Count);
        }

        protected override void GetData(SerializeData data) {
            data.SetValue("Offset", Offset);
            data.SetValue("Count", Count);
        }
    }
}