SqlBetweenExpressionNode.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 System.Linq;

namespace Deveel.Data.Sql.Parser {
    class SqlBetweenExpressionNode : SqlNode, IExpressionNode {
        private bool expressionSeen;
        private bool minValueSeen;

        public IExpressionNode Expression { get; private set; }

        public IExpressionNode MinValue { get; private set; }

        public IExpressionNode MaxValue { get; private set; }

        public bool Not { get; private set; }

        protected override ISqlNode OnChildNode(ISqlNode node) {
            if (node is IExpressionNode) {
                if (!expressionSeen) {
                    Expression = (IExpressionNode) node;
                    expressionSeen = true;
                } else if (!minValueSeen) {
                    MinValue = (IExpressionNode) node;
                    minValueSeen = true;
                } else {
                    MaxValue = (IExpressionNode) node;
                }
            } else if (node.NodeName == "not_opt") {
                Not = node.ChildNodes.Any();
            }

            return base.OnChildNode(node);
        }
    }
}