QueryReference.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.Types;

namespace Deveel.Data.Sql.Query {
    public sealed class QueryReference {
        public QueryReference(ObjectName name, int level) {
            Level = level;
            Name = name;
        }

        public int Level { get; private set; }

        public ObjectName Name { get; private set; }

        public DataObject Value { get; private set; }

        public SqlType ReturnType {
            get { return Value == null ? null : Value.Type; }
        }

        public DataObject Evaluate(IVariableResolver resolver) {
            Value = resolver.Resolve(Name);
            return Value;
        }
    }
}